北祁连造山带嘉峪关北大草滩地区早志留世碎屑锆石LA-ICP-MS U-Pb年龄及其地质意义

孟勇; 唐淑兰; 李向民; 李艳广; 卜涛

北祁连造山带嘉峪关北大草滩地区早志留世碎屑锆石LA-ICP-MS U-Pb年龄及其地质意义

1.
中国地质调查局西安地质调查中心, 陕西西安 710054

2.
西安财经学院, 陕西西安 710100

基金项目:
中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》（编号：DD20160012）、《中国及邻区海陆大地构造研究和相关图件编制（西安中心）》（编号：121201232000167711）和西安财经学院项目《高分辩率遥感影像信息提取的多尺度分析方法研究》（编号：16FCJH05）

详细信息

作者简介: 孟勇(1979-), 男, 硕士, 高级工程师, 从事区域地质调查及综合研究工作。E-mail:16392800@qq.com

中图分类号: P534.43;P597⁺.3

收稿日期: 2017-07-07

修回日期: 2018-03-13

刊出日期: 2018-04-25

LA-ICP-MS zircon U-Pb dating of the Early Silurian clastic rocks in Dacaotan of Jiayuguan, North Qilian orogenic belt

1.
Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shaanxi, China

2.
Xi'an University of Finance and Economics, Xi'an 710100, Shaanxi, China

Received Date: 07 July 2017

Revised Date: 13 March 2018

Publish Date: 25 April 2018

摘要

摘要:
以北祁连造山带嘉峪关北大草滩地区原划为中—下奥陶统的阴沟群碎屑岩为研究对象，进行碎屑锆石LA-ICP-MS UPb测年，探讨其形成时代、物源组成和构造背景。结果表明，碎屑岩沉积时代早于432.5Ma，为早志留世，该套沉积地层并不属于早—中奥陶世阴沟群。碎屑锆石U-Pb同位素年龄可明显分为4组：早古生代年龄组，434~521Ma，峰值为447Ma；新元古代年龄组，791~992Ma，峰值年龄966Ma；中古元古代年龄组，1017~1755Ma，并出现1120Ma、1278Ma、1427Ma和1648Ma多个峰值；古元古代早期—新太古代晚期年龄组，1879~2663Ma，并出现2089Ma、2428Ma和2543Ma多个峰值。综合分析显示，碎屑岩沉积物质来源于祁连造山带和阿拉善地块，祁连造山带早古生代岛弧型岩浆岩和新元古代岩浆岩，以及造山带结晶基底岩系为该套碎屑岩沉积提供了更重要的物源。
- 早志留世 /
- 碎屑锆石 /
- LA-ICP-MSU-Pb测年 /
- 沉积物源 /
- 北祁连造山带
Abstract:
The detrital rocks distributed in Dacaotan, northern Jiayuguan in the North Qilian orogenic belt were chosen as the study object, which was originally considered to be of the Yingou Group of Middle-Lower Ordovician. LA-ICP-MS zircon U-Pb iso-tope chronology was investigated to study the formation age, material source composition and tectonic background of the Yingou Group. The results show that the sedimentary age of the Yingou Group is earlier than 432.5Ma, and hence its age should be Early Si-lurian and it does not belong to the Yingou Group of Middle-Lower Ordovician. The zircon age spectrum can be evidently divided into four groups:Early Paleozoic age group from 434~521Ma, with the peak value being 447Ma; Neoproterozoic age group from 791~992Ma, with the peak value being 966Ma; Mesoproterozoic age group from 1017~1755Ma, with the peak value varying from 1120Ma, 1278Ma, 1427Ma to 1648Ma; Paleoproterozoic-Neoarchaean age group from 1879~2663Ma, with the peak value varying from 2089Ma, 2428Ma to 2543Ma. Comprehensive analyses show that the material source was derived form Qilian tectonic zone and Alashan block. The Early Paleozoic island-type magmatic rock in Qilian tectonic zone, Neoproterozoic magmatic rock and tectonic zone crystalline basement rock series contributed much to the sedimentation of the detrital rocks.
- Early Silurian /
- detrital zircon /
- LA-ICP-MS U-Pb dating /
- provenance /
- North Qilian orogenic belt

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图 1 北祁连造山带地质简图

Figure 1.

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图 2 嘉峪关北大草滩地质剖面

Figure 2.

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图 3 长石岩屑杂砂岩野外露头（a）及显微照片（b）

Figure 3.

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图 4 代表性碎屑锆石CL图像及²⁰⁷Pb/²⁰⁶Pb或²⁰⁶Pb/²³⁸U年龄

Figure 4.

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图 5 二长花岗岩锆石CL图像及²⁰⁷Pb/²⁰⁶Pb或²⁰⁶Pb/²³⁸U年龄

Figure 5.

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图 6 单颗粒碎屑锆石LA-ICP-MS U-Pb年龄谐和图

Figure 6.

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图 7 单颗粒碎屑锆石LA-ICP-MS U-Pb年龄频谱图

Figure 7.

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图 8 二长花岗岩锆石U-Pb谐和图（a）及加权平均年龄图（b）

Figure 8.

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表 1 碎屑锆石LA-ICP-MS U-Th-Pb同位素分析结果

Table 1. LA-ICP-MS U-Th-Pb data of detrital zircons

样点编号	同位素比值								年龄/Ma								Th/10^-6	U/10^-6	Th/U
样点编号	Pb²⁰⁷/Pb²⁰⁶	±σ	Pb²⁰⁷/U²³⁵	±σ	Pb²⁰⁶/U²³⁸	±σ	Pb²⁰⁸/Th²³²	±σ	Pb²⁰⁷/Pb²⁰⁶	±σ	Pb²⁰⁷/U²³⁵	±σ	Pb²⁰⁶/U²³⁸	±σ	Pb²⁰⁸/Th²³²	±σ	Th/10^-6	U/10^-6	Th/U
样品P02
P02-01	0.15799	0.00409	10.34628	0.26549	0.47518	0.0072	0.1266	0.00238	2434.2	43.17	2466.3	23.76	2506.2	31.48	2409.3	42.68	66.37	57.07	1.16
P02-02	0.15751	0.00249	10.47264	0.17211	0.48246	0.00597	0.12256	0.00172	2429.1	26.51	2477.5	15.23	2538	25.97	2336.8	31.06	120.21	176.28	0.68
P02-03	0.07125	0.00159	1.60106	0.03611	0.16305	0.00203	0.04973	0.00075	964.6	44.92	970.6	14.1	973.7	11.28	981	14.47	246.96	419.21	0.59
P02-04	0.09731	0.00163	2.33904	0.04051	0.17442	0.0021	0.06728	0.00086	1573.1	31.05	1224.2	12.32	1036.4	11.51	1316.1	16.27	397.97	771.01	0.52
P02-05	0.33967	0.00566	5.20137	0.08597	0.11111	0.00146	0.10694	0.00126	3661.3	25.25	1852.8	14.08	679.2	8.45	2053.6	23.07	299.83	375.99	0.80
P02-06	0.06579	0.00177	1.2206	0.03282	0.13461	0.00174	0.03779	0.00062	799.8	55.36	810	15.01	814.1	9.9	749.7	12.1	221.12	304	0.73
P02-07	0.14006	0.00504	7.74859	0.27259	0.40143	0.00708	0.09773	0.0027	2227.9	60.99	2202.3	31.64	2175.6	32.56	1884.7	49.66	27.65	29.79	0.93
P02-08	0.17984	0.00319	12.78025	0.23225	0.51563	0.00674	0.12547	0.00174	2651.4	29.15	2663.6	17.11	2680.6	28.65	2389.1	31.28	182.45	143.07	1.28
P02-09	0.08155	0.00249	2.11199	0.06391	0.18792	0.00263	0.05909	0.00128	1234.7	58.68	1152.7	20.85	1110.1	14.26	1160.3	24.37	81.36	154.53	0.53
P02-10	0.19841	0.00327	5.14635	0.08645	0.1882	0.00236	0.06897	0.00084	2813.2	26.7	1843.8	14.28	1111.6	12.8	1348.1	15.94	443.49	389.1	1.14
P02-11	0.08374	0.00263	0.85213	0.02643	0.07383	0.00103	0.03095	0.00061	1286.5	60.19	625.8	14.49	459.2	6.19	616	11.91	198.77	376.86	0.53
P02-12	0.07136	0.00208	1.68881	0.04903	0.17172	0.00231	0.04559	0.00093	967.7	58.43	1004.3	18.51	1021.6	12.72	901.2	17.99	135.67	249.12	0.54
P02-13	0.06931	0.00243	1.25788	0.04354	0.13169	0.00188	0.03851	0.00076	907.9	70.52	827	19.58	797.5	10.68	763.8	14.71	201.09	234.36	0.86
P02-14	0.06444	0.00207	0.64928	0.02072	0.07311	0.00099	0.02232	0.00036	756.2	66.5	508	12.76	454.8	5.95	446.1	7.07	584.44	556.9	1.05
P02-15	0.0588	0.00402	0.63247	0.04238	0.07805	0.0015	0.0247	0.00095	559.6	142.41	497.6	26.36	484.5	8.99	493.1	18.75	74.22	129.85	0.57
P02-16	0.40839	0.00513	11.89931	0.15882	0.21141	0.00252	0.40718	0.00428	3940.3	18.7	2596.5	12.5	1236.3	13.42	6904.2	61.43	667.32	1504.76	0.44
P02-17	0.07184	0.00193	0.72433	0.01937	0.07315	0.00095	0.03052	0.00059	981.5	53.71	553.2	11.4	455.1	5.7	607.7	11.53	214.06	636.09	0.34
P02-18	0.14595	0.00273	7.37217	0.14017	0.36649	0.00472	0.09836	0.00154	2299	31.82	2157.6	17	2012.9	22.26	1896.3	28.31	126.09	162.42	0.78
P02-19	0.0537	0.00325	0.52414	0.03117	0.07082	0.00123	0.01988	0.0007	358.5	130.52	427.9	20.77	441.1	7.38	398	13.78	79.91	149.33	0.54
P02-20	0.05858	0.00552	0.66521	0.06145	0.08239	0.00194	0.02096	0.00127	551.5	193.37	517.8	37.47	510.4	11.58	419.3	25.23	27.18	49.53	0.55
P02-21	0.07528	0.00168	1.91246	0.0431	0.18432	0.00231	0.05036	0.00124	1076.1	44.2	1085.4	15.03	1090.6	12.58	993.1	23.83	71.48	349.58	0.20
P02-22	0.16192	0.00286	10.23195	0.18519	0.45849	0.00589	0.12146	0.0017	2475.8	29.55	2456	16.74	2432.9	26.01	2316.9	30.64	143.25	131.82	1.09
P02-23	0.05447	0.00214	0.53445	0.02073	0.07119	0.001	0.0213	0.00057	390.5	84.97	434.8	13.71	443.3	6.04	425.9	11.29	124.88	327.23	0.38
P02-24	0.06783	0.00321	1.35221	0.06282	0.14465	0.00237	0.04534	0.00121	863.2	95.14	868.5	27.12	870.9	13.34	896.3	23.44	67.45	93.35	0.72
P02-25	0.05788	0.00245	0.57397	0.02396	0.07195	0.00106	0.02148	0.00057	525	90.46	460.6	15.45	447.9	6.37	429.6	11.31	128.12	268.66	0.48
P02-26	0.07484	0.00189	1.64827	0.04166	0.15979	0.00206	0.04283	0.00069	1064.3	49.99	988.9	15.97	955.6	11.46	847.8	13.32	236.93	290.7	0.82
P02-27	0.05707	0.00286	0.62748	0.03095	0.07977	0.00127	0.02277	0.00085	493.7	107.42	494.5	19.31	494.8	7.59	455.1	16.86	73.25	202.47	0.36
P02-28	0.07211	0.00258	1.72293	0.06092	0.17336	0.00253	0.05002	0.00087	989	71.2	1017.1	22.72	1030.6	13.88	986.4	16.74	232.71	178.41	1.30
P02-29	0.07158	0.00203	1.64245	0.04638	0.16647	0.00222	0.04706	0.00084	974.2	56.79	986.7	17.82	992.7	12.25	929.5	16.27	206.97	284.79	0.73
P02-30	0.0644	0.00252	1.18124	0.04553	0.13309	0.00196	0.03614	0.00063	754.7	80.37	791.9	21.2	805.5	11.14	717.6	12.29	275.47	187.37	1.47
P02-31	0.05612	0.00214	0.56852	0.02143	0.0735	0.00104	0.02238	0.00055	456.7	82.16	457.1	13.87	457.2	6.22	447.3	10.93	179.37	397.33	0.45
P02-32	0.0525	0.00297	0.50887	0.02834	0.07032	0.00116	0.02026	0.00054	307.4	123.7	417.7	19.07	438.1	7	405.5	10.64	159.46	188.5	0.85
P02-33	0.31284	0.00437	8.36895	0.12117	0.1941	0.00237	0.1655	0.00185	3535	21.38	2271.8	13.13	1143.5	12.79	3095.6	32.07	638.26	746.45	0.86
P02-34	0.06888	0.00168	1.44563	0.03544	0.15229	0.00193	0.04031	0.00131	895	49.63	908.1	14.72	913.8	10.8	798.9	25.54	47.72	372.85	0.13
P02-35	0.10637	0.00232	2.37668	0.05185	0.16211	0.00208	0.15129	0.00309	1738.2	39.35	1235.6	15.59	968.5	11.54	2847.6	54.22	41.07	317.24	0.13
P02-36	0.0669	0.00389	1.28019	0.07303	0.13884	0.00255	0.03943	0.00175	834.7	116.83	836.9	32.52	838.1	14.43	781.7	33.98	27.03	67.33	0.40
P02-37	0.14177	0.00226	2.8049	0.046	0.14355	0.00173	0.08494	0.00105	2248.9	27.28	1356.8	12.28	864.7	9.77	1647.8	19.48	408.73	728.25	0.56
P02-38	0.5079	0.00641	8.50243	0.11265	0.12146	0.00145	0.16187	0.0017	4264.3	18.45	2286.2	12.04	739	8.35	3032.4	29.57	1526.05	1649.57	0.93
P02-39	0.09851	0.00194	2.47174	0.04937	0.18205	0.00226	0.08104	0.00137	1596.1	36.4	1263.8	14.44	1078.2	12.33	1575	25.58	137.13	436.02	0.31
P02-40	0.1796	0.00265	5.45002	0.08351	0.22017	0.00265	0.23988	0.00304	2649.2	24.27	1892.8	13.15	1282.8	14.01	4346	49.62	181.38	674.88	0.27
P02-41	0.05962	0.00331	0.62213	0.0339	0.07571	0.00128	0.02495	0.00065	589.8	116.02	491.2	21.22	470.5	7.7	498.1	12.78	120.77	142.38	0.85
P02-42	0.19944	0.00322	5.09426	0.08368	0.18532	0.0023	0.10876	0.00133	2821.6	26.09	1835.2	13.94	1096	12.5	2086.8	24.18	455.64	525.75	0.87
P02-43	0.07113	0.00206	1.58536	0.04562	0.16171	0.00216	0.04897	0.00105	961.1	58.03	964.5	17.92	966.3	11.99	966.3	20.15	94.61	209.27	0.45
P02-44	0.07025	0.00187	1.55411	0.04125	0.1605	0.00209	0.0477	0.0009	935.8	53.6	952.1	16.4	959.5	11.59	941.9	17.42	150.81	292.11	0.52
P02-45	0.06935	0.00239	1.52091	0.05175	0.15911	0.00226	0.04694	0.00078	909.3	69.31	938.8	20.84	951.8	12.55	927.2	14.98	245.54	181.43	1.35
P02-46	0.06888	0.00336	1.35435	0.06481	0.14266	0.00238	0.03792	0.00126	895.1	97.54	869.4	27.95	859.7	13.43	752.3	24.5	49.27	89.44	0.55
P02-47	0.09134	0.00361	2.83393	0.10969	0.22509	0.00366	0.0673	0.00207	1453.7	73.47	1364.6	29.05	1308.7	19.24	1316.5	39.23	61.17	121.67	0.50
P02-48	0.0711	0.00183	1.58469	0.04068	0.1617	0.00208	0.04738	0.00089	960.4	51.61	964.2	15.98	966.2	11.56	935.7	17.26	170.01	351.28	0.48
P02-49	0.09709	0.00194	3.30763	0.06687	0.24716	0.00309	0.06926	0.00111	1569	36.96	1482.9	15.76	1423.8	15.95	1353.5	20.95	192.28	305.32	0.63
P02-50	0.11084	0.00203	3.84872	0.07184	0.25192	0.00311	0.18705	0.00516	1813.2	32.94	1603	15.04	1448.4	16.02	3465.8	87.91	21.54	413.9	0.05
P02-51	0.05527	0.00267	0.53356	0.02543	0.07004	0.00108	0.02068	0.00062	423.1	104.33	434.2	16.84	436.4	6.51	413.8	12.36	94.51	203.59	0.46
P02-52	0.47185	0.00718	7.23518	0.10911	0.11125	0.00143	0.09408	0.00108	4155.6	22.34	2140.8	13.45	680	8.32	1817.3	20.04	624.7	440.6	1.42
P02-53	0.10629	0.00225	4.29936	0.09146	0.29346	0.00376	0.08808	0.00156	1736.8	38.18	1693.2	17.52	1658.8	18.76	1706.2	29.02	88.32	162.99	0.54
P02-54	0.05806	0.00224	0.54659	0.02086	0.0683	0.00097	0.01986	0.00045	531.6	82.92	442.8	13.69	425.9	5.84	397.4	8.83	194.84	293.03	0.66
P02-55	0.07672	0.00164	1.87927	0.04055	0.17772	0.0022	0.0522	0.00094	1113.9	42.09	1073.8	14.3	1054.5	12.04	1028.5	18.02	146	370.75	0.39
P02-56	0.10099	0.0026	4.0051	0.10263	0.28772	0.00392	0.08072	0.00177	1642.4	47.06	1635.2	20.82	1630.1	19.64	1569	33.13	57.47	114.13	0.50
P02-57	0.12692	0.00173	6.66283	0.09645	0.38087	0.00445	0.10439	0.00124	2055.7	23.91	2067.7	12.78	2080.4	20.79	2007	22.62	428.4	519.56	0.82
P02-58	0.38344	0.00546	6.20777	0.08992	0.11746	0.00145	0.12393	0.00141	3845.4	21.32	2005.5	12.67	715.9	8.36	2361.4	25.39	528.64	602.11	0.88
P02-59	0.05372	0.00239	0.52979	0.02327	0.07155	0.00106	0.02075	0.00049	359.2	97.26	431.7	15.45	445.5	6.38	415	9.76	181.38	243.03	0.75
P02-60	0.07246	0.00153	1.64189	0.03495	0.1644	0.00202	0.0461	0.00108	998.8	42.17	986.4	13.43	981.2	11.16	910.9	20.86	75.32	401.48	0.19
P02-61	0.07174	0.00168	1.61962	0.03816	0.16379	0.00206	0.04853	0.00101	978.6	47.1	977.8	14.79	977.8	11.4	957.9	19.51	100.08	320.02	0.31
P02-62	0.06896	0.00157	1.48545	0.03394	0.15628	0.00194	0.04781	0.00082	897.5	46.14	924.5	13.86	936.1	10.82	943.9	15.86	173.51	373.52	0.46
P02-63	0.06003	0.00242	0.61281	0.02431	0.07406	0.00107	0.02359	0.00044	604.6	84.76	485.3	15.31	460.6	6.44	471.3	8.74	269.3	239.4	1.12
P02-64	0.07175	0.00164	1.59449	0.03665	0.16123	0.00201	0.0457	0.00082	978.8	45.91	968.1	14.34	963.6	11.17	903.3	15.9	161.82	349.85	0.46
P02-65	0.27553	0.00327	23.3198	0.30027	0.61402	0.00711	0.15699	0.00175	3337.8	18.43	3240.4	12.54	3086.1	28.4	2947.3	30.58	523.68	456.04	1.15
P02-66	0.30082	0.00491	3.96406	0.06436	0.0956	0.00122	0.10395	0.00129	3474.4	25.06	1626.9	13.16	588.6	7.17	1998.8	23.69	397.31	555.13	0.72
P02-67	0.05468	0.00333	0.56783	0.03406	0.07533	0.00128	0.02768	0.00078	400.1	129.87	456.6	22.06	468.2	7.65	551.9	15.42	107.74	151.79	0.71
P02-68	0.05571	0.00212	0.5535	0.02081	0.07208	0.00101	0.0229	0.00038	440.5	82.54	447.3	13.6	448.7	6.04	457.6	7.57	393.05	302.94	1.30
P02-69	0.14495	0.00205	3.56322	0.05277	0.17834	0.00209	0.10288	0.00121	2287.2	24.17	1541.4	11.74	1057.9	11.46	1979.2	22.2	473.94	812.67	0.58
P02-70	0.234	0.00306	5.69926	0.07847	0.17669	0.00207	0.25705	0.00296	3079.6	20.71	1931.3	11.89	1048.9	11.35	4624	47.65	327.61	956.44	0.34
P02-71	0.07571	0.0022	1.91633	0.05534	0.18362	0.00248	0.05539	0.00086	1087.5	57.25	1086.8	19.27	1086.7	13.49	1089.7	16.51	232.07	172.08	1.35
P02-72	0.06944	0.00169	1.50487	0.03677	0.15721	0.00198	0.04623	0.00092	912	49.42	932.4	14.9	941.3	11.05	913.5	17.74	111.37	283.76	0.39
P02-73	0.22706	0.00396	4.59976	0.07993	0.14697	0.00188	0.16999	0.00238	3031.4	27.67	1749.2	14.49	883.9	10.56	3173.2	41.15	126.57	318.92	0.40
P02-74	0.15906	0.00221	7.5249	0.10989	0.34322	0.00405	0.1127	0.00149	2445.7	23.35	2176	13.09	1902.1	19.42	2158.5	27.08	231.39	422.71	0.55
P02-75	0.40951	0.00516	9.14282	0.12112	0.16197	0.00191	0.21823	0.00241	3944.4	18.77	2352.4	12.13	967.7	10.6	3989.9	40.02	894.6	1175.09	0.76
P02-76	0.05529	0.00283	0.5326	0.02678	0.06988	0.0011	0.02077	0.00064	423.7	109.83	433.5	17.74	435.5	6.64	415.5	12.6	87.53	164.31	0.53
P02-77	0.09668	0.00193	2.10024	0.04227	0.1576	0.00195	0.05797	0.00084	1561	36.99	1148.9	13.84	943.4	10.84	1138.9	16.08	280.86	393.96	0.71
P02-78	0.05661	0.00236	0.57747	0.02371	0.074	0.00107	0.02302	0.00049	475.7	90.19	462.8	15.26	460.2	6.42	460	9.6	188.41	224.29	0.84
P02-79	0.22573	0.00365	2.80186	0.04556	0.09005	0.00111	0.0836	0.00105	3022	25.7	1356	12.17	555.8	6.59	1622.9	19.5	354	549.23	0.64
P02-80	0.06984	0.00182	1.59423	0.04149	0.1656	0.00213	0.04995	0.00092	923.7	52.69	968	16.24	987.8	11.77	985.2	17.71	122.58	218.28	0.56
P02-81	0.10292	0.00232	4.31159	0.09737	0.3039	0.00396	0.09954	0.00177	1677.5	41.11	1695.6	18.61	1710.6	19.57	1917.9	32.51	70.57	116.09	0.61
P02-82	0.05631	0.00222	0.56051	0.02179	0.07221	0.00102	0.0237	0.00045	463.8	85.71	451.9	14.18	449.5	6.14	473.5	8.92	222.45	239.28	0.93
P02-83	0.07026	0.00197	0.77851	0.02166	0.08039	0.00105	0.02872	0.00056	935.9	56.44	584.6	12.36	498.4	6.24	572.3	10.91	187.17	369.54	0.51
P02-84	0.07057	0.00201	1.53235	0.04329	0.15752	0.00208	0.04703	0.0008	945.1	57.16	943.4	17.36	943	11.57	928.9	15.46	178.8	192.51	0.93
样品P57
P57-01	0.09249	0.00208	3.12084	0.06993	0.24481	0.00306	0.06957	0.00117	1477.4	42.11	1437.8	17.23	1411.7	15.83	1359.5	22.07	175.95	276.33	0.64
P57-02	0.05932	0.00251	0.57317	0.02384	0.0701	0.00102	0.02033	0.00042	578.9	89.31	460.1	15.38	436.8	6.12	406.8	8.27	335.45	352.45	0.95
P57-03	0.05705	0.00271	0.55937	0.02616	0.07114	0.00108	0.02115	0.00048	492.7	101.87	451.1	17.03	443	6.5	423.1	9.44	297.7	310.03	0.96
P57-04	0.05672	0.00208	0.54988	0.0199	0.07034	0.00095	0.02153	0.00045	480.1	79.73	444.9	13.04	438.2	5.73	430.6	8.86	312.82	502.67	0.62
P57-05	0.07461	0.00411	0.7389	0.03966	0.07185	0.00128	0.02335	0.00058	1057.8	107.35	561.8	23.16	447.3	7.68	466.5	11.39	224.72	196.66	1.14
P57-06	0.07561	0.00205	2.02619	0.05443	0.19443	0.00251	0.05793	0.00116	1084.8	53.35	1124.3	18.26	1145.3	13.53	1138.3	22.12	129.7	262.75	0.49
P57-07	0.07526	0.00276	1.70528	0.06143	0.16441	0.00238	0.04228	0.00094	1075.4	71.89	1010.5	23.06	981.2	13.18	837	18.3	171.99	199.63	0.86
P57-08	0.07108	0.00168	1.52446	0.03591	0.15562	0.00191	0.04756	0.00096	959.6	47.47	940.3	14.44	932.4	10.63	939.2	18.61	166.34	557.53	0.30
P57-09	0.16946	0.00232	8.48064	0.12097	0.36312	0.00417	0.15132	0.00219	2552.3	22.79	2283.9	12.96	1996.9	19.72	2848.2	38.5	292.95	1298.03	0.23
P57-10	0.05737	0.00302	0.57433	0.02963	0.07263	0.00117	0.02156	0.00057	505.5	112.07	460.8	19.11	452	7.02	431.2	11.2	209.61	260.47	0.80
P57-11	0.07191	0.0016	1.5362	0.03415	0.155	0.00187	0.04315	0.00074	983.4	44.54	945	13.67	929	10.45	853.8	14.41	313.88	687.77	0.46
P57-12	0.0758	0.003	1.99707	0.07772	0.19115	0.00289	0.05396	0.00128	1089.9	77.41	1114.5	26.33	1127.6	15.67	1062.2	24.58	94.81	122.12	0.78
P57-13	0.06999	0.00232	1.58743	0.05194	0.16457	0.00226	0.04785	0.00107	928.1	66.64	965.3	20.38	982.1	12.49	944.7	20.66	123.88	227.56	0.54
P57-14	0.1581	0.00284	9.29854	0.16873	0.42674	0.00533	0.10238	0.00182	2435.5	30.16	2367.9	16.64	2291	24.09	1970.1	33.33	105.12	184.17	0.57
P57-15	0.14186	0.00245	7.33406	0.12846	0.37513	0.00456	0.09925	0.00177	2250	29.55	2153	15.65	2053.5	21.38	1912.6	32.62	121.5	277.12	0.44
P57-16	0.07598	0.00284	1.9343	0.07096	0.18471	0.00272	0.05569	0.00208	1094.6	72.97	1093	24.56	1092.7	14.81	1095.5	39.83	37.38	162.07	0.23
P57-17	0.06992	0.0021	1.5488	0.04608	0.16073	0.00212	0.04515	0.00173	925.9	60.57	950	18.36	960.8	11.79	892.6	33.48	42.36	292.74	0.14
P57-18	0.0539	0.00448	0.54478	0.04444	0.07334	0.00155	0.02512	0.00116	366.6	177.44	441.6	29.21	456.3	9.32	501.4	22.84	58.83	114.02	0.52
P57-19	0.05624	0.00493	0.59532	0.05116	0.0768	0.00171	0.02112	0.0009	461.2	184.23	474.3	32.56	477	10.26	422.3	17.87	80.97	94.85	0.85
P57-20	0.11412	0.0022	4.87805	0.09475	0.31015	0.00381	0.0848	0.00118	1866.1	34.45	1798.5	16.37	1741.5	18.77	1645.2	21.99	241.68	247.85	0.98
P57-21	0.05584	0.00469	0.5653	0.0466	0.07346	0.00157	0.02783	0.00116	445.5	177.05	455	30.23	457	9.41	554.8	22.85	46.44	83.58	0.56
P57-22	0.11298	0.00235	5.36676	0.11191	0.34469	0.00435	0.0896	0.00173	1847.9	37.19	1879.6	17.85	1909.2	20.85	1734.5	32.16	85.89	179.84	0.48
P57-23	0.05594	0.00271	0.54118	0.02579	0.07019	0.00107	0.02133	0.00053	449.8	104.51	439.2	16.99	437.3	6.45	426.6	10.54	165.34	235.25	0.70
P57-24	0.07035	0.00175	1.48333	0.03679	0.153	0.0019	0.04586	0.00133	938.6	50.2	923.6	15.04	917.7	10.64	906.2	25.71	59.2	376.69	0.16
P57-25	0.07049	0.0025	1.5741	0.05509	0.16204	0.00229	0.04499	0.00117	942.7	71.13	960	21.73	968.1	12.71	889.4	22.69	82.67	173.92	0.48
P57-26	0.16108	0.00287	10.15387	0.18295	0.45741	0.00574	0.11601	0.00184	2467.1	29.79	2448.9	16.65	2428.1	25.37	2218.5	33.41	106.4	146.34	0.73
P57-27	0.07236	0.00212	1.64267	0.04773	0.16473	0.00217	0.03619	0.00079	996.1	58.22	986.7	18.34	983	12.01	718.6	15.44	141.52	237.08	0.60
P57-28	0.05816	0.00183	0.60752	0.01891	0.0758	0.00098	0.02323	0.00053	535.1	67.89	482	11.94	471	5.88	464.2	10.48	182.95	508	0.36
P57-29	0.07241	0.00307	1.6065	0.06682	0.161	0.00248	0.04588	0.00098	997.4	83.77	972.7	26.03	962.3	13.78	906.7	18.91	103.5	97.8	1.06
P57-30	0.07075	0.00182	1.53721	0.03939	0.15768	0.00199	0.05893	0.00104	950.1	51.81	945.4	15.76	943.9	11.06	1157.3	19.85	128.68	321.4	0.40
P57-31	0.07064	0.00154	1.53973	0.03364	0.15818	0.00191	0.04593	0.00074	947	43.94	946.4	13.45	946.6	10.62	907.7	14.39	213.81	451.43	0.47
P57-32	0.06043	0.00163	0.80866	0.02171	0.09711	0.00121	0.02618	0.00052	619.1	57.18	601.7	12.19	597.4	7.12	522.3	10.32	202.83	496.24	0.41
P57-33	0.06803	0.00156	1.45085	0.03322	0.15476	0.00188	0.04193	0.00124	869.5	46.66	910.2	13.76	927.6	10.51	830.2	24.04	52.64	433.19	0.12
P57-34	0.08341	0.00144	2.50951	0.04413	0.21833	0.00255	0.06329	0.001	1278.6	33.34	1274.8	12.77	1273.1	13.48	1240.5	18.99	181.44	617.25	0.29
P57-35	0.06696	0.00175	1.45653	0.03787	0.15786	0.00199	0.0374	0.00086	836.4	53.47	912.6	15.65	944.9	11.05	742.2	16.7	113.22	318.57	0.36
P57-36	0.07235	0.00211	1.75702	0.05065	0.17625	0.00232	0.04886	0.00108	995.7	57.69	1029.8	18.65	1046.4	12.72	964.2	20.8	90.56	196.66	0.46
P57-37	0.10721	0.00295	4.6345	0.12584	0.3137	0.00438	0.09119	0.0021	1752.6	49.47	1755.5	22.68	1758.9	21.48	1763.9	38.95	49.54	95.09	0.52
P57-38	0.05706	0.00227	0.5724	0.02246	0.07281	0.00102	0.02076	0.00052	493.1	86	459.6	14.5	453	6.15	415.4	10.26	195.71	377.37	0.52
P57-39	0.16361	0.00381	10.20119	0.23532	0.45249	0.00641	0.12011	0.00177	2493.3	38.72	2453.2	21.33	2406.3	28.45	2292.7	31.86	153.62	81.33	1.89
P57-40	0.07089	0.00295	1.58944	0.06495	0.16272	0.00249	0.04671	0.00128	954.2	82.83	966.1	25.47	971.9	13.79	922.8	24.73	81.42	134.75	0.60
P57-41	0.08057	0.00766	2.14065	0.19835	0.19281	0.00544	0.06329	0.00314	1211	176.51	1162	64.13	1136.6	29.42	1240.3	59.69	17.76	20.1	0.88
P57-42	0.05424	0.00406	0.54026	0.03961	0.07228	0.00144	0.02034	0.00089	381	159.42	438.6	26.11	449.9	8.68	407	17.71	71.9	130.96	0.55
P57-43	0.05645	0.00216	0.60682	0.02293	0.07801	0.00109	0.0217	0.0005	469.5	83.4	481.6	14.49	484.2	6.49	433.8	9.9	292.33	498.4	0.59
P57-44	0.05913	0.0025	0.5918	0.02465	0.07264	0.00106	0.01762	0.00045	571.7	89.55	472	15.72	452.1	6.38	353.1	8.88	188.08	289.63	0.65
P57-45	0.06374	0.00245	1.14716	0.0435	0.13061	0.00187	0.03783	0.0008	733.1	79.49	775.9	20.57	791.4	10.68	750.5	15.59	150.77	191.12	0.79
P57-46	0.05972	0.00372	0.6937	0.04238	0.0843	0.00152	0.0266	0.00075	593.7	129.48	535	25.41	521.7	9.03	530.7	14.84	97.26	109.21	0.89
P57-47	0.08413	0.00266	2.53082	0.07891	0.21833	0.00307	0.06131	0.00106	1295.5	60.39	1280.9	22.69	1273	16.25	1202.6	20.18	128.57	109	1.18
P57-48	0.2586	0.00395	23.04171	0.36147	0.6467	0.00811	0.15951	0.00317	3238.2	23.85	3228.7	15.27	3215.3	31.75	2991.4	55.18	40.53	110.32	0.37
P57-49	0.0598	0.0038	0.58097	0.03614	0.07052	0.00128	0.02061	0.00054	596.2	131.91	465.1	23.21	439.3	7.73	412.3	10.64	155.3	131.23	1.18
P57-50	0.28356	0.00567	23.62074	0.47	0.60461	0.00884	0.30756	0.00517	3382.6	30.84	3252.9	19.38	3048.4	35.52	5420.1	79.85	49.18	61.04	0.81
P57-51	0.07918	0.00165	1.75864	0.03677	0.16121	0.00195	0.04519	0.00066	1176.6	40.62	1030.3	13.53	963.5	10.84	893.3	12.73	255.2	385.29	0.66
P57-52	0.05359	0.00644	0.50309	0.05932	0.06814	0.00186	0.01945	0.00124	353.6	250.83	413.8	40.08	425	11.2	389.3	24.52	31.04	56.2	0.55
P57-53	0.06784	0.00317	0.71719	0.03282	0.07673	0.00122	0.01922	0.00054	863.7	94.1	549	19.41	476.6	7.32	384.8	10.68	233.46	351.4	0.66
P57-54	0.07046	0.00344	0.65053	0.03104	0.06702	0.0011	0.01994	0.00051	941.7	96.99	508.8	19.09	418.2	6.66	399	10.17	319.97	367.01	0.87
P57-55	0.07384	0.00501	1.78534	0.11821	0.1755	0.00372	0.04904	0.00241	1037	131.21	1040.1	43.09	1042.4	20.41	967.6	46.35	26.96	55.28	0.49
P57-56	0.0531	0.00315	0.4883	0.02846	0.06675	0.00114	0.01924	0.00073	333.1	128.53	403.7	19.42	416.5	6.87	385.2	14.54	102.79	247.28	0.42
P57-57	0.09298	0.00719	0.88585	0.0665	0.06916	0.00161	0.01461	0.00106	1487.5	139.85	644.1	35.8	431.1	9.73	293.1	21.21	71.75	97.85	0.73
P57-58	0.04226	0.00324	0.41167	0.03136	0.07071	0.0011	0.01926	0.00046	0.1	0	350.1	22.56	440.4	6.64	385.6	9.09	229.3	260.93	0.88
P57-59	0.23522	0.01065	9.53609	0.40981	0.29429	0.00627	0.25893	0.0056	3087.9	70.49	2391	39.49	1662.9	31.22	4654.2	89.92	32.75	42.16	0.78
P57-60	-0.27587	0.0161	-2.61591	0.1454	0.06883	0.00155	0.0165	0.0007	0.1	0	-NaN	-91.36	429.1	9.32	330.8	14	88.49	88.28	1.00
P57-61	0.13118	0.00259	7.21019	0.14318	0.399	0.0051	0.09873	0.00177	2113.8	34.25	2137.8	17.71	2164.4	23.49	1903	32.61	106.25	179.28	0.59
P57-62	0.05311	0.00331	0.51102	0.03131	0.06985	0.00122	0.01958	0.00057	333.3	134.87	419.1	21.04	435.3	7.34	392	11.37	127.82	152.82	0.84
P57-63	0.09118	0.00349	3.11869	0.11694	0.24828	0.00394	0.07323	0.00237	1450.3	71.26	1437.3	28.83	1429.6	20.34	1428.4	44.64	33.08	78.94	0.42
P57-64	0.08823	0.00205	3.08939	0.07155	0.25419	0.00324	0.07718	0.0015	1387.5	43.8	1430.1	17.76	1460.1	16.64	1502.7	28.2	92.56	234.36	0.39
P57-65	0.06923	0.00191	1.42959	0.0391	0.14991	0.00194	0.04792	0.00371	905.6	55.76	901.4	16.34	900.4	10.87	946.1	71.58	8.14	357.83	0.02
P57-66	0.05642	0.00535	0.54184	0.05031	0.06972	0.00166	0.02222	0.00115	468	197.94	439.6	33.13	434.5	9.99	444.1	22.7	47.23	87.85	0.54
P57-67	0.07898	0.00261	2.11651	0.06879	0.19455	0.00276	0.05317	0.00091	1171.6	63.96	1154.2	22.41	1146	14.9	1047.1	17.53	212.11	169.85	1.25
P57-68	0.06069	0.00556	0.70145	0.06284	0.0839	0.002	0.02115	0.0007	628.4	185.93	539.7	37.5	519.4	11.88	422.9	13.82	117.65	68.1	1.73
P57-69	0.15831	0.00446	9.88901	0.27361	0.45349	0.00712	0.12223	0.00237	2437.7	46.96	2424.5	25.51	2410.7	31.56	2330.9	42.71	70.14	53.78	1.30
P57-70	0.06139	0.00362	0.67718	0.03911	0.08008	0.00142	0.02529	0.00075	653	121.78	525.1	23.68	496.6	8.49	504.9	14.79	93.08	126.96	0.73
P57-71	0.06986	0.00196	1.53612	0.04271	0.15963	0.00208	0.04549	0.00087	924.4	56.54	945	17.1	954.7	11.57	899.1	16.87	168.94	312.65	0.54
P57-72	0.06786	0.00162	0.91865	0.02187	0.09828	0.00121	0.03068	0.0008	864.3	48.69	661.6	11.58	604.3	7.12	610.7	15.64	106.43	702.49	0.15
P57-73	0.07288	0.00174	1.65866	0.03959	0.16523	0.00207	0.0459	0.00127	1010.7	47.4	992.9	15.12	985.8	11.43	907.2	24.55	55.75	328.39	0.17
P57-74	0.0681	0.00322	1.50852	0.07008	0.16083	0.0026	0.04299	0.00219	871.7	95.07	933.8	28.37	961.4	14.45	850.7	42.36	16.91	81.04	0.21
P57-75	0.05338	0.00265	0.54157	0.02649	0.07366	0.00113	0.02363	0.00058	345	108.37	439.5	17.45	458.2	6.79	472.1	11.42	146.33	207.4	0.71
P57-76	0.05498	0.00178	0.56211	0.01805	0.07423	0.00097	0.02021	0.00029	411.5	70.23	452.9	11.73	461.6	5.84	404.4	5.66	746.92	479.42	1.56
P57-77	0.07105	0.0025	1.49111	0.05162	0.15238	0.00216	0.04094	0.0011	958.9	70.19	926.8	21.04	914.3	12.09	811	21.31	63.99	151.59	0.42
P57-78	0.07744	0.00164	1.89675	0.04041	0.17784	0.00217	0.02724	0.00061	1132.6	41.65	1079.9	14.16	1055.2	11.9	543.2	12.08	141.35	387.93	0.36
P57-79	0.05444	0.00243	0.53559	0.02352	0.07143	0.00105	0.01843	0.00059	389.4	96.5	435.5	15.55	444.8	6.35	369.1	11.67	101.65	241.95	0.42
P57-80	0.05665	0.002	0.71193	0.02482	0.09125	0.00124	0.02359	0.00049	477.2	76.85	545.9	14.72	562.9	7.33	471.3	9.74	206.99	320.04	0.65
P57-81	0.07639	0.00387	2.04591	0.1014	0.19447	0.0034	0.05427	0.00161	1105.3	97.98	1130.9	33.8	1145.6	18.35	1068.1	30.83	41.51	55.92	0.74
P57-82	0.07313	0.00452	1.83446	0.11095	0.18215	0.00357	0.05021	0.00226	1017.6	120.41	1057.9	39.74	1078.7	19.49	990.3	43.41	21.05	45.42	0.46
P57-83	0.05516	0.00208	0.54551	0.02031	0.07181	0.001	0.02036	0.00035	418.5	81.74	442.1	13.34	447.1	5.98	407.4	6.95	458.43	414.81	1.11
P57-84	0.07766	0.00253	2.17624	0.06986	0.2035	0.00287	0.05157	0.00112	1138.1	63.43	1173.5	22.33	1194.1	15.39	1016.4	21.56	96.15	136.56	0.70

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表 2 花岗岩LA-ICP-MS锆石U-Th-Pb同位素分析结果

Table 2. LA-ICP-MS U-Th-Pb data of granite zircons

样点编号	同位素比值								年龄/Ma								Th/10^-6	U/10^-6	Th/U
样点编号	Pb²⁰⁷/Pb²⁰⁶	±σ	Pb²⁰⁷/U²³⁵	±σ	Pb²⁰⁶/U²³⁸	±σ	Pb²⁰⁸/Th²³²	±σ	Pb²⁰⁷/Pb²⁰⁶	±σ	Pb²⁰⁷/U²³⁵	±σ	Pb²⁰⁶/U²³⁸	±σ	Pb²⁰⁸/Th²³²	±σ	Th/10^-6	U/10^-6	Th/U
样品P34
P3401	0.0581	0.00382	0.58718	0.03796	0.07322	0.00129	0.02038	0.00085	532.9	138.44	469.1	24.28	455.5	7.74	407.8	16.83	33.66	76.1	0.44
P3402	0.0525	0.0043	0.50038	0.04041	0.06905	0.0013	0.02528	0.00102	307.1	175.94	412	27.35	430.4	7.84	504.6	20.01	32.9	73.57	0.45
P3403	0.05491	0.00356	0.51168	0.03258	0.06751	0.00116	0.02048	0.00075	408.4	138.82	419.6	21.89	421.2	7.03	409.7	14.85	52.22	107.2	0.49
P3404	0.05536	0.00464	0.51046	0.0421	0.06681	0.00133	0.018	0.00121	426.4	177.14	418.8	28.3	416.9	8.05	360.5	23.98	32.98	76.73	0.43
P3405	0.05518	0.00378	0.52967	0.03562	0.06955	0.00124	0.01978	0.00083	419.2	146.13	431.6	23.64	433.5	7.49	395.9	16.52	51.89	104.38	0.50
P3406	0.05316	0.00372	0.51828	0.03563	0.07065	0.00126	0.02041	0.00085	335.5	150.47	424	23.83	440.1	7.56	408.5	16.91	46.84	105.42	0.44
P3407	0.05363	0.00265	0.50368	0.02451	0.06806	0.00102	0.02003	0.00053	355.5	107.27	414.2	16.55	424.5	6.14	400.9	10.42	131.3	208.79	0.63
P3408	0.05594	0.00354	0.54019	0.03359	0.06999	0.0012	0.02131	0.00077	449.5	135.08	438.6	22.15	436.1	7.23	426.3	15.33	61.48	126.45	0.49
P3409	0.05328	0.00366	0.49245	0.03321	0.06699	0.00119	0.01867	0.00084	340.7	147.69	406.6	22.59	418	7.21	373.8	16.73	51.42	112.57	0.46
P3410	0.05357	0.00326	0.52209	0.03127	0.07064	0.00117	0.02269	0.00073	352.8	131.42	426.5	20.86	440	7.04	453.4	14.35	75.69	141.25	0.54
P3411	0.06199	0.00573	0.62033	0.05628	0.07254	0.0016	0.02509	0.00151	673.7	186.13	490.1	35.27	451.4	9.6	500.8	29.68	23.54	61.03	0.39
P3412	0.05553	0.00496	0.56036	0.04918	0.07315	0.00157	0.019	0.00115	433.4	187.87	451.8	32	455.1	9.41	380.5	22.83	32.33	66.9	0.48
P3413	0.05465	0.00346	0.49943	0.03105	0.06626	0.00115	0.01716	0.00055	398.1	135.46	411.3	21.03	413.6	6.94	343.8	11.01	114.08	146.09	0.78
P3414	0.05725	0.00335	0.53409	0.03066	0.06764	0.00114	0.0186	0.00062	500.8	124.33	434.5	20.29	421.9	6.86	372.5	12.36	84.25	137.61	0.61
P3415	0.0585	0.00513	0.55786	0.04803	0.06915	0.00148	0.02095	0.00122	548.6	180.85	450.1	31.31	431.1	8.93	419	24.17	35.86	77.26	0.46
P3416	0.0555	0.00371	0.52282	0.03436	0.06832	0.00122	0.02041	0.00079	432	142.83	427	22.91	426	7.38	408.4	15.63	69.19	136.84	0.51
P3417	0.05604	0.00455	0.54808	0.04372	0.07093	0.00142	0.0258	0.00132	453.6	171.1	443.7	28.67	441.8	8.57	514.8	26.04	31.19	88.37	0.35
P3418	0.05341	0.00449	0.49098	0.04061	0.06668	0.00134	0.01854	0.00092	346.1	179.61	405.6	27.66	416.1	8.12	371.4	18.33	39.86	93.52	0.43
P3419	0.05235	0.00379	0.53161	0.03781	0.07367	0.00139	0.02189	0.00108	300.7	156.87	432.9	25.07	458.2	8.33	437.8	21.42	45.67	104.02	0.44
P3420	0.05377	0.00469	0.51365	0.04397	0.0693	0.00148	0.01704	0.00126	361.2	185.68	420.9	29.5	432	8.91	341.6	25.07	29.53	75.88	0.39
P3421	0.05765	0.00408	0.54497	0.03787	0.06858	0.00129	0.02115	0.00112	516.2	148.69	441.7	24.89	427.6	7.8	423.1	22.11	36.33	109.21	0.33
P3422	0.07024	0.00415	0.71372	0.04119	0.07372	0.00134	0.02535	0.00103	935.4	116.71	547	24.41	458.6	8.02	505.9	20.32	47.18	107.67	0.44
P3423	0.05258	0.00424	0.51217	0.0407	0.07068	0.00136	0.02256	0.00101	310.6	173.31	419.9	27.33	440.3	8.19	450.8	19.97	46.21	92.9	0.50
P3424	0.06331	0.00486	0.59008	0.04439	0.06764	0.00137	0.02676	0.00118	718.5	155.12	470.9	28.35	421.9	8.3	533.7	23.22	35.56	80.97	0.44

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