北淮阳东段徐家湾岩体地质和地球化学特征及LA-ICP-MS锆石U-Pb年龄

陈芳; 杜建国; 万秋; 邱军强; 汤金来

doi:10.15898/j.cnki.11-2131/td.2016.03.017

北淮阳东段徐家湾岩体地质和地球化学特征及LA-ICP-MS锆石U-Pb年龄

安徽省地质调查院, 安徽合肥 230001

基金项目:
中国地质调查局地质调查工作项目(1212011220547)

详细信息

中图分类号: O657.63;P597.3

收稿日期: 2015-09-01

修回日期: 2016-01-13

录用日期: 2016-05-20

Geochemical Characteristics and LA-ICP-MS Zircon U-Pb Geochronology of Xujiawan Monzogranite in the Eastern Part of North Huaiyang and Their Geological Significance

Geological Survey of Anhui Province, Hefei 230001, China

Received Date: 01 September 2015

Revised Date: 13 January 2016

Accepted Date: 20 May 2016

摘要

摘要: 徐家湾二长花岗岩体位于北淮阳构造带内桐柏-桐城与郯城-庐江两大断裂的交汇处,岩体呈岩株状侵入新元古界老变质岩层中。本文利用原子吸收光谱和ICP-MS法测定了岩体主量和微量元素的含量,表明岩体具SiO₂和Al₂O₃较高、富碱、过铝质、Mg^#小等特征。大离子亲石元素(LILE)Rb、Ba富集,Sr亏损;高场强元素(HFSE)Y、Th、Nb、Hf、U富集,Ta、P、Ti亏损;岩体整体亏损HFSE,富集LILE;La_N/Yb_N与LREEs/HREEs值均较大,具较弱的δCe负异常,显示该岩体为过铝质A型花岗。LA-ICP-MS锆石U-Pb定年获得徐家湾二长花岗岩侵位年龄在128.0±0.9~129.6±1.4 Ma之间,是早白垩世岩浆活动的产物。研究认为徐家湾二长花岗岩体形成于造山后的伸展环境,形成岩体的岩浆源于岩石圈地幔,并受到地壳物质的混染。
- 北淮阳构造带 /
- 二长花岗岩 /
- 地球化学 /
- LA-ICP-MS锆石U-Pb定年 /
- 早白垩世
Abstract: The Xujiawan monzogranitic intrusion is located at the junction of the Tongbai-Tongcheng fault and the Tancheng-Lujiang fault in North Huaiyang tectonic belt. The rocks intruded into the Neoproterozoic metamorphic rocks as stocks. In this study, major and trace element contents of the rocks are determined by Atomic Absorption Spectrometer and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). Results show that these rocks have high contents of SiO₂ and Al₂O₃ and are alkali-rich and peraluminous with low Mg^# values. They are rich in large ion lithophile elements such as Rb and Ba, but are poor in Sr. They are rich in high field strength elements such as Y, Th, Nb, Hf, U, but are poor in Ta, P, Ti. In general, these rocks are deplete in HFSE but enriched in LILE. They have high La_N/Yb_N and LREE/HREE ratios and have weak Ce anomalies. Major and trace elements indicate that these rocks belong to peraluminous A-type granite. LA-ICP-MS Zircon U-Pb dating of Xujiawan monzogranite yield ages of 128.0 0.9 Ma to 129.6 1.4 Ma, indicating that these intrusions were produced by the early Cretaceous magmatism. Xujiawan monzogranite may have formed in a post-collisional extensional setting. The magma may be derived from the mantle and contaminated by the continental crust.
- North Huaiyang tectonic belt /
- monzogranite /
- geochemistry /
- LA-ICP-MS Zircon U-Pb dating /
- early Cretaceous

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图 1 北淮阳地区区域构造位置图（ａ）及徐家湾地区地质简图（ｂ）

Figure 1.

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图 2 徐家湾二长花岗岩稀土元素球粒陨石标准化及微量元素原始地幔标准化图解(球粒陨石和原始地幔标准化数据据Sun等^[16])

Figure 2.

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图 3 徐家湾二长花岗岩的构造背景判别图解(据Pearce等^[45])

Figure 3.

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表 1 徐家湾二长花岗岩全岩主量(%)和微量(×10^-6)数据

Table 1. Chemical compositions (%),REE and trace element (×10^-6) compositions of the Xujiawan monzogranite

主微量元素	采样点位TW13					采样点位TW15
主微量元素	h56	h57	h58	h59	h60	h66	h67	h68	h69	h70
SiO₂	68.91	69.23	68.90	68.39	68.39	69.28	69.47	69.65	69.81	69.50
TiO₂	0.48	0.44	0.51	0.48	0.51	0.46	0.46	0.47	0.49	0.46
Al₂O₃	15.30	14.84	14.78	15.32	15.01	14.94	15.00	14.43	14.79	14.85
Fe₂O₃	2.09	1.84	1.79	0.78	1.82	1.37	1.54	1.27	1.49	1.54
FeO	0.80	0.98	1.18	1.91	1.21	1.38	1.15	1.47	1.30	1.18
MnO	0.06	0.05	0.06	0.06	0.06	0.06	0.05	0.05	0.06	0.06
MgO	0.98	0.96	1.02	1.04	1.11	1.04	1.00	1.01	1.05	1.05
CaO	1.49	1.71	1.82	1.87	1.93	1.93	1.72	1.75	1.86	1.94
Na₂O	4.00	3.87	3.78	3.78	3.78	3.78	3.78	3.78	3.78	3.78
K₂O	4.84	4.59	4.58	4.74	4.59	4.76	4.80	4.70	4.67	4.77
P₂O₅	0.19	0.17	0.20	0.20	0.21	0.17	0.16	0.17	0.17	0.17
H₂O⁺	0.22	0.22	0.62	0.66	0.62	0.44	0.60	0.50	0.44	0.66
LOI	0.65	0.63	0.73	0.89	0.88	0.69	0.69	0.74	0.63	0.73
Total	100.02	99.55	99.98	100.11	100.11	100.30	100.41	100.00	100.54	100.69
Mg^#	0.50	0.49	0.48	0.45	0.50	0.49	0.50	0.47	0.49	0.50
DI	86.09	85.37	84.56	83.45	83.68	84.33	85.32	85.27	84.71	84.62
SI	7.77	7.88	8.29	8.51	8.86	8.48	8.20	8.24	8.53	8.52
A/NCK	1.05	1.02	1.02	1.04	1.02	1.00	1.03	0.99	1.01	1.00
A/NK	1.29	1.31	1.32	1.35	1.34	1.31	1.31	1.28	1.31	1.30
La	67.02	78.90	76.54	60.49	64.17	67.61	69.23	81.43	81.27	73.58
Ce	119.88	133.54	153.87	115.22	126.76	126.13	123.16	152.81	149.11	137.67
Pr	13.01	14.03	15.89	12.94	14.66	13.60	13.38	15.71	15.24	14.38
Nd	47.59	49.93	57.24	47.28	53.15	48.80	47.15	55.46	54.15	51.67
Sm	7.09	7.34	8.30	7.11	8.05	7.35	6.95	7.99	7.92	7.65
Eu	1.39	1.43	1.55	1.46	1.55	1.36	1.31	1.39	1.38	1.37
Gd	6.25	6.54	7.34	6.24	6.96	6.42	6.08	7.16	6.90	6.68
Tb	0.84	0.85	0.95	0.82	0.92	0.84	0.81	0.93	0.89	0.89
Dy	4.25	4.39	5.01	4.27	4.86	4.32	4.13	4.79	4.68	4.57
Ho	0.82	0.84	0.95	0.82	0.93	0.84	0.80	0.90	0.89	0.87
Er	2.37	2.43	2.80	2.41	2.72	2.42	2.36	2.70	2.62	2.53
Tm	0.37	0.39	0.44	0.38	0.43	0.39	0.38	0.42	0.41	0.41
Yb	2.46	2.54	2.96	2.49	2.82	2.56	2.44	2.77	2.67	2.68
Lu	0.38	0.39	0.44	0.37	0.42	0.39	0.39	0.42	0.41	0.42
Y	23.41	24.03	26.86	23.27	26.17	23.73	22.85	25.57	25.52	25.04
ΣREEs	273.72	303.53	334.29	262.28	288.40	283.02	278.57	334.89	328.54	305.36
LREEs	255.99	285.17	313.40	244.49	268.34	264.85	261.19	314.80	309.06	286.32
HREEs	17.74	18.36	20.89	17.79	20.06	18.18	17.38	20.09	19.48	19.04
LREEs/HREEs	14.43	15.53	15.00	13.75	13.38	14.57	15.03	15.67	15.86	15.04
La_N/Yb_N	19.57	22.31	18.54	17.42	16.31	18.94	20.37	21.07	21.81	19.68
δEu	0.63	0.62	0.60	0.65	0.62	0.59	0.60	0.55	0.56	0.57
δCe	0.93	0.91	1.03	0.96	0.97	0.96	0.93	0.98	0.97	0.97
Rb	155.95	151.21	156.61	146.94	147.98	169.69	175.19	179.84	164.48	179.74
Ba	1604.42	1452.62	1542.51	1839.10	1669.08	1500.75	1482.74	1308.65	1371.58	1326.25
Th	22.36	33.51	31.21	13.50	13.75	40.64	37.46	37.32	40.16	39.07
U	3.44	4.99	5.77	4.88	5.43	8.97	7.66	7.75	7.60	7.92
Ta	1.67	1.71	1.65	1.37	1.69	1.91	1.87	1.87	2.00	1.99
Nb	20.89	20.85	22.54	19.52	22.87	22.38	22.02	22.21	24.48	24.50
Sr	522.93	440.96	564.15	537.87	501.39	531.56	501.39	481.61	415.79	495.28
Zr	228.16	228.80	260.80	225.60	265.04	234.16	254.88	227.92	281.20	254.80
Hf	7.22	7.15	7.85	6.98	7.97	7.65	8.13	7.48	8.76	8.42
注：A/CNK=Al₂O₃/(CaO+Na₂O+K₂O)；A/NK= Al₂O₃/(Na₂O+K₂O)；Mg^#=MgO/(MgO+FeO+Fe₂O₃)。

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表 2 徐家湾二长花岗岩LA-ICP-MS 锆石 U-Pb分析结果

Table 2. LA-ICP-MS zircon U-Pb dating results of Xujiawan monzogranite

分析点	Th(×10^-6)	U (×10^-6)	Th/U	同位素比值			U-Pb同位素年龄(Ma)
分析点	Th(×10^-6)	U (×10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
TW13-1	254.73	212.68	1.20	0.05068	0.00252	0.13545	0.00844	0.01994	0.00029	226	106	129	8	127	2
TW13-2	242.58	219.72	1.10	0.09406	0.00572	0.25730	0.01964	0.02014	0.00036	1509	106	232	16	129	2
TW13-3	377.69	232.10	1.63	0.06012	0.00315	0.16765	0.01107	0.02068	0.00032	608	105	157	10	132	2
TW13-5	352.79	345.10	1.02	0.07102	0.00300	0.19906	0.01071	0.02037	0.00027	958	85	184	9	130	2
TW13-6	278.38	235.81	1.18	0.09814	0.00428	0.27780	0.01554	0.02033	0.00029	1589	80	249	12	130	2
TW13-8	383.94	366.22	1.05	0.04832	0.00221	0.13166	0.00751	0.01983	0.00026	115	99	126	7	127	2
TW13-9	387.59	298.68	1.30	0.05374	0.00223	0.15151	0.00809	0.02091	0.00029	360	88	143	7	133	2
TW13-10	374.05	297.85	1.26	0.05357	0.00243	0.14821	0.00846	0.02024	0.00027	353	97	140	7	129	2
TW13-11	237.45	216.71	1.10	0.05874	0.00377	0.16699	0.01315	0.02113	0.00035	558	132	157	11	135	2
TW13-12	465.71	361.73	1.29	0.05115	0.00262	0.13586	0.00892	0.01964	0.00033	248	127	129	8	125	2
TW13-13	421.13	377.90	1.11	0.04639	0.00198	0.12424	0.00666	0.01934	0.00024	18	97	119	6	123	2
TW13-15	376.79	388.55	0.97	0.04707	0.00183	0.13155	0.00659	0.02006	0.00026	53	76	125	6	128	2
TW13-16	234.80	229.64	1.02	0.04710	0.00249	0.13602	0.00890	0.02122	0.00030	54	103	129	8	135	2
TW13-17	354.26	255.58	1.39	0.06026	0.00259	0.16119	0.00892	0.02010	0.00029	613	87	152	8	128	2
TW13-18	380.09	294.50	1.29	0.05304	0.00227	0.14200	0.00782	0.01941	0.00027	331	91	135	7	124	2
TW13-19	415.00	433.25	0.96	0.04946	0.00211	0.13867	0.00805	0.02054	0.00037	170	92	132	7	131	2
TW13-20	212.82	159.96	1.33	0.04291	0.00256	0.12228	0.00893	0.02139	0.00032	-128	126	117	8	136	2
TW13-21	261.62	237.07	1.10	0.07079	0.00380	0.20722	0.01382	0.02043	0.00031	951	112	191	12	130	2
TW13-22	379.95	315.50	1.20	0.05912	0.00285	0.16768	0.01005	0.02073	0.00028	572	107	157	9	132	2
TW13-23	322.62	268.86	1.20	0.04620	0.00244	0.13155	0.00853	0.02002	0.00027	8	101	125	8	128	2
TW13-24	257.50	231.09	1.11	0.04861	0.00259	0.13017	0.00866	0.01995	0.00030	129	110	124	8	127	2
TW13-25	214.70	206.13	1.04	0.07574	0.00678	0.20706	0.02226	0.02033	0.00042	1088	168	191	19	130	3
TW13-26	260.19	216.91	1.20	0.05623	0.00321	0.15526	0.01081	0.02022	0.00029	461	126	147	10	129	2
TW13-27	259.70	257.10	1.01	0.05307	0.00266	0.14763	0.00927	0.02070	0.00030	332	113	140	8	132	2
TW15-1	230.34	232.66	0.99	0.05131	0.00304	0.13601	0.00998	0.01991	0.00032	255	132	129	9	127	2
TW15-2	490.31	304.56	1.61	0.06175	0.00297	0.17327	0.01036	0.01998	0.00027	665	101	162	9	127	2
TW15-4	320.82	200.06	1.60	0.04583	0.00489	0.12089	0.01526	0.01964	0.00043	-11	200	116	14	125	3
TW15-5	187.05	161.41	1.16	0.06710	0.00532	0.18972	0.01869	0.02104	0.00046	841	166	176	16	134	3
TW15-6	287.84	236.29	1.22	0.07091	0.00743	0.19275	0.02376	0.01954	0.00041	955	220	179	20	125	3
TW15-7	585.28	249.81	2.34	0.06950	0.00364	0.19812	0.01296	0.02090	0.00031	914	106	184	11	133	2
TW15-8	185.81	237.63	0.78	0.06593	0.00366	0.17352	0.01203	0.02006	0.00032	804	115	162	10	128	2
TW15-9	257.01	255.81	1.00	0.05091	0.0028	0.14190	0.00951	0.02046	0.00028	237	122	135	8	131	2
TW15-11	291.85	254.45	1.15	0.06608	0.00453	0.18073	0.01464	0.02005	0.00028	809	143	169	13	128	2
TW15-12	356.89	294.66	1.21	0.05376	0.00293	0.14500	0.00967	0.01919	0.00027	361	120	137	9	123	2
TW15-13	423.37	366.81	1.15	0.05262	0.00257	0.14025	0.00844	0.01937	0.00025	312	108	133	8	124	2
TW15-14	249.03	219.13	1.14	0.09308	0.00517	0.25809	0.01884	0.02052	0.00041	1490	104	233	15	131	3
TW15-15	361.94	272.70	1.33	0.04851	0.00281	0.12792	0.00894	0.01986	0.00027	124	124	122	8	127	2
TW15-16	320.60	266.28	1.20	0.04920	0.00306	0.13301	0.00991	0.01974	0.00028	157	135	127	9	126	2
TW15-17	308.61	255.64	1.21	0.05373	0.00284	0.15262	0.00984	0.02074	0.00028	360	116	144	9	132	2
TW15-18	220.80	202.19	1.09	0.06699	0.00368	0.18418	0.0125	0.01993	0.00029	838	113	172	11	127	2
TW15-19	228.61	204.68	1.12	0.04721	0.00323	0.12842	0.01048	0.01995	0.00030	60	143	123	9	127	2
TW15-20	275.97	266.77	1.03	0.04972	0.00271	0.13890	0.00926	0.02015	0.00028	182	120	132	8	129	2
TW15-21	304.01	255.06	1.19	0.04465	0.00317	0.12326	0.01031	0.02041	0.00030	-37	139	118	9	130	2
TW15-23	340.46	234.82	1.45	0.09257	0.00591	0.25569	0.01997	0.02001	0.00033	1479	120	231	16	128	2
TW15-25	243.26	203.15	1.20	0.05453	0.00371	0.14805	0.01220	0.02016	0.00033	393	150	140	11	129	2
TW15-27	154.81	165.70	0.93	0.05711	0.00394	0.15774	0.01310	0.02024	0.00033	496	151	149	11	129	2
TW15-28	285.16	221.70	1.29	0.06209	0.00355	0.16854	0.01185	0.02008	0.00030	677	121	158	10	128	2
TW15-29	125.60	132.05	0.95	0.04958	0.00389	0.14565	0.01357	0.02038	0.00034	175	171	138	12	130	2
TW15-30	285.79	223.78	1.28	0.05386	0.00298	0.14342	0.00974	0.02001	0.00029	365	122	136	9	128	2
TW15-32	258.32	228.16	1.13	0.06404	0.00469	0.18696	0.01625	0.02068	0.00032	743	155	174	14	132	2
TW15-33	418.98	376.16	1.11	0.05722	0.00388	0.15508	0.01281	0.01928	0.00033	500	148	146	11	123	2
TW15-34	198.71	208.76	0.95	0.05991	0.00387	0.16553	0.01298	0.02042	0.00032	600	139	156	11	130	2
TW15-35	334.33	270.31	1.24	0.05600	0.00378	0.15774	0.01293	0.01974	0.00032	452	148	149	11	126	2
TW15-36	530.61	346.10	1.53	0.04740	0.00264	0.13081	0.00884	0.01987	0.00027	69	115	125	8	127	2
TW15-37	306.33	247.06	1.24	0.05203	0.00282	0.14585	0.00977	0.02019	0.00029	287	121	138	9	129	2
TW15-38	198.56	153.88	1.29	0.13325	0.00850	0.34771	0.02817	0.01971	0.00039	2141	110	303	21	126	2

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北淮阳东段徐家湾岩体地质和地球化学特征及LA-ICP-MS锆石U-Pb年龄

安徽省地质调查院, 安徽 合肥 230001

Geochemical Characteristics and LA-ICP-MS Zircon U-Pb Geochronology of Xujiawan Monzogranite in the Eastern Part of North Huaiyang and Their Geological Significance

Geological Survey of Anhui Province, Hefei 230001, China

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安徽省地质调查院, 安徽合肥 230001