新疆南天山红柳沟辉长岩地球化学特征及地质意义

张旗; 李尚启; 刘元; 沈锐; 常昊; 火兴开; 晁文迪

doi:10.12401/j.nwg.2024056

新疆南天山红柳沟辉长岩地球化学特征及地质意义

中国冶金地质总局西北地质勘查院，陕西西安　710119

基金项目: 中国冶金地质总局项目“新疆和静县乌兰赛尔-红柳沟一带韧性剪切带型金矿成矿特征研究及找矿预测”（CMGBK202105）资助。

详细信息

作者简介: 张旗（1984−），男，工程师，从事基础地质、矿产勘查工作。E−mail：312267719@qq.com

通讯作者: 李尚启（1990−），男，工程师，从事基础地质、矿产勘查工作。E−mail：349966977@qq.com。

中图分类号: P588.12

收稿日期: 2023-06-07

修回日期: 2024-03-21

录用日期: 2024-06-05

刊出日期: 2024-10-20

Geochemical Characteristics and Geological Significance of Gabbro from the South Tianshan Hongliugou in Xinjiang

Northwest Geological Exploration Institute of China Metallurgical Geology Administration, Xi’an 710119, Shaanxi, China

More Information

Corresponding author: LI Shangqi, 349966977@qq.com

Received Date: 07 June 2023

Revised Date: 21 March 2024

Accepted Date: 05 June 2024

Publish Date: 20 October 2024

摘要

摘要:
红柳沟辉长岩位于南天山北缘东段哈尔克-萨阿尔明晚古生代沟弧带东部，是南天山北缘-中天山南缘早古生代弧岩浆带内出露为数不多的基岩侵入岩体。辉长岩主要由斜长石（±48%）、普通辉石（±42%）、黑云母（±5%）、角闪石（±5%）组成。岩石化学成分显示辉长岩Na₂O含量为2.49%～3.08%，平均为2.83%；K₂O含量为1.6%～2.4%，平均为2.02%，里特曼指数为1.78～2.09，均小于3.3；分异指数为50.3～57.06，主、微量图解显示其为拉斑-钙碱性系列；辉长岩稀土元素球粒陨石标准化配分模式与E-MORB相似，轻稀土富集，重稀土亏损，未见明显的δEu异常，微量元素具有Rb、Ba、Th、U等大离子亲石元素富集和Ta、Nb、Ti等高场强元素亏损；锆石原位εHf（t）值为-1.27～8.75，反映辉长岩来源于亏损地幔，并上升的过程中受到地壳明显混染，基性岩的（Na₂O+K₂O）/TiO₂判别图解显示红柳沟辉长岩源区碳酸盐化橄榄岩部分熔融。锆石U-Pb测年显示辉长岩形成年龄为为（410.4±2.3） Ma（MSWD=0.51，n=25）。本次研究补充了南天山构造带辉长岩年代学、地球化学证据，结合区域地质资料，笔者提出在早泥盆世，南天山洋存在洋陆俯冲作用，并伴随有基性岩侵入。
- 红柳沟 /
- 南天山 /
- 辉长岩 /
- 地球化学 /
- 年代学
Abstract:
The Hongliugou gabbro is located in the eastern part of the Halke Saarming Late Paleozoic arc belt on the northern edge of the South Tianshan Mountains. It is one of the few intrusive rock masses exposed in the Early Paleozoic arc magmatic belt on the northern edge of the South Tianshan Mountains and the southern edge of the Central Tianshan Mountains. Gabbro is mainly composed of plagioclase (±48%), common pyroxene (±42%), biotite (±5%), and hornblende (±5%). The chemical composition of the rock shows that the Na₂O content of gabbro ranges from 2.49% to 3.08%, with an average of 2.83%; The K₂O content ranges from 1.6% to 2.4%, with an average of 2.02%. The Rittman index is 1.78 to 2.09, both of which are less than 3.3%; The differentiation index ranges from 50.3 to 57.06, and the main trace diagram shows that it belongs to the plaque calcium alkaline series; The standardized distribution pattern of rare earth elements in gabbro chondrite meteorites is similar to that of E-MORB, with enrichment of light rare earth elements and depletion of heavy rare earth elements, and no significant difference observed δ Eu anomaly, trace elements with enrichment of large ion lithophilic elements such as Rb, Ba, Th, U, and depletion of high field strength elements such as Ta, Nb, Ti; Zircon in-situ the εHf (t) value ranges from 1.27 to 8.75, indicating that the gabbro originated from the depleted mantle and was significantly contaminated by the crust during its ascent. The w (Na₂O+K₂O)/w (TiO₂) discrimination diagram of the basic rocks shows partial melting of carbonated peridotite in the Hongliugou gabbro source area. The zircon U-Pb dating shows that the age of gabbro formation is (410.4±2.3)Ma (MSWD=0.51, n=25). This study supplemented the dating and geochemical evidence of gabbro in the South Tianshan tectonic belt, and combined with regional geological data, we proposed that in the Early Devonian, there was oceanic continental subduction in the South Tianshan Ocean, accompanied by the intrusion of basic rocks.
- Hongliugou area /
- South Tianshan /
- gabbro /
- geochemistry /
- chronology

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图 1 红柳沟地区地质简图

Figure 1.

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图 2 红柳沟辉长岩野外（a、b、c）与显微镜下照片（d）

Figure 2.

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图 3 红柳沟辉长岩TAS图解（a）和Zr-Y图解（b）

Figure 3.

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图 4 稀土元素球粒陨石标准化模式图（a）和微量元素原始地幔标准化蛛网图（b）

Figure 4.

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图 5 红柳沟辉长岩锆石阴极发光图

Figure 5.

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图 6 红柳沟辉长岩锆石U-Pb谐和图和加权年龄平均图

Figure 6.

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图 7 红柳沟辉长岩岩石成因和岩浆源区判别图

Figure 7.

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图 8 红柳沟辉长岩构造环境判别图

Figure 8.

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表 1 红柳沟辉长岩主量元素（%）分析结果表

Table 1. Major elements (%) analytic data table of the Hongliugou gabbro

样品号	H62-YQ1	H62-YQ2	H62-YQ3	H62-YQ4	H62-YQ5	H62-YQ6	H62-YQ7	H62-YQ8
SiO₂	45.76	46.29	44.24	45.31	45.96	45.86	44.52	45.24
TiO₂	0.833	0.940	0.848	0.859	0.860	0.964	0.772	0.813
Al₂O₃	12.26	12.67	12.78	12.93	12.90	13.03	12.26	12.58
Fe₂O₃	8.24	10.11	9.64	8.21	8.62	8.66	7.72	8.38
FeO	5.27	6.78	5.88	6.09	6.21	6.00	5.73	6.23
MnO	0.151	0.122	0.144	0.143	0.132	0.134	0.158	0.142
MgO	10.71	11.62	11.39	11.10	11.06	11.33	10.35	11.33
CaO	7.56	5.21	6.64	6.94	6.44	6.18	8.84	7.17
Na₂O	3.08	2.61	2.95	3.03	2.85	2.89	2.75	2.49
K₂O	1.60	2.14	2.09	2.10	2.40	1.79	1.93	2.13
P₂O₅	0.346	0.362	0.333	0.350	0.352	0.359	0.319	0.339
LOI	3.98	0.99	2.90	2.79	2.06	2.62	4.46	2.97
总量	99.79	99.85	99.84	99.86	99.83	99.81	99.82	99.81
Mg^#	45.77	42.27	43.91	45.17	44.19	45.11	44.95	45.14

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表 2 红柳沟辉长岩微量和稀土元素（10⁻⁶）分析结果表

Table 2. Trace and REE element (10⁻⁶) analytic data table of the Hongliugou gabbro

样品号	H62-YQ1	H62-YQ2	H62-YQ3	H62-YQ4	H62-YQ5	H62-YQ6	H62-YQ7	H62-YQ8
Rb	108	144	134	132	160	109	120	130
Ba	1670	649	746	548	1279	1114	1103	1121
Th	7.76	8.43	8.30	7.56	8.56	8.38	8.00	7.54
U	2.49	2.35	2.11	2.27	2.22	2.09	2.18	2.00
Ta	0.54	0.76	0.64	0.87	0.49	0.78	0.97	0.46
Nb	9.63	10.0	9.29	9.57	10.1	10.3	9.12	9.17
Sr	303	195	239	230	239	236	305	257
Zr	145	178	179	176	152	180	170	156
Hf	4.24	4.72	4.94	5.11	4.14	4.86	4.89	4.41
Y	22.3	24.9	22.8	23.1	22.7	26.5	22.0	21.3
La	46.4	49.0	45.9	46.1	48.2	48.4	45.3	45.1
Ce	89.4	94.7	86.9	87.9	94.6	91.7	84.9	85.2
Nd	44.9	49.6	46.2	46.1	47.8	47.9	43.2	44.6
Sm	8.43	9.27	8.76	8.95	9.01	9.16	8.06	8.31
Pr	11.6	12.7	11.9	12.0	12.5	12.5	11.5	11.5
Eu	2.74	2.14	2.12	2.12	2.48	2.72	2.40	2.38
Gd	6.44	6.69	6.56	6.66	6.87	6.91	6.12	6.48
Tb	1.02	1.11	1.02	1.06	1.06	1.15	0.99	1.00
Dy	4.62	5.28	4.93	5.10	4.93	5.57	4.92	4.72
Ho	0.85	0.94	0.90	0.90	0.95	1.06	0.85	0.88
Er	2.74	2.53	2.49	2.63	2.84	2.81	2.53	2.46
Tm	0.34	0.36	0.37	0.35	0.35	0.39	0.35	0.34
Yb	2.26	2.49	2.37	2.50	2.46	2.54	2.35	2.30
Lu	0.37	0.35	0.38	0.36	0.39	0.39	0.40	0.35
LREE	203.38	217.51	201.74	203.10	214.48	212.30	195.28	196.99
HREE	18.64	19.77	19.02	19.55	19.85	20.82	18.52	18.54
∑REE	222.02	237.27	220.76	222.65	234.33	233.11	213.80	215.53
δEu	1.09	0.79	0.82	0.8	0.93	1.0	1.0	0.96
LREE/HREE	10.91	11.00	10.61	10.39	10.81	10.20	10.55	10.63
（La/Yb）_N	13.86	13.25	13.07	12.45	13.19	12.87	12.97	13.18
（Gd/Yb）_N	2.30	2.17	2.24	2.15	2.25	2.20	2.10	2.27

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表 3 红柳沟辉长岩LA-MC-ICP-MS锆石U-Pb定年结果

Table 3. Ziron U-Pb dating data for the Hongliugou gabbro

测点号	Th（10⁻⁶）	U（10⁻⁶）	Th/U	同位素比值						年龄（Ma）
测点号	Th（10⁻⁶）	U（10⁻⁶）	Th/U	²⁰⁷Pb/²⁰⁶Pb	1δ	²⁰⁷Pb/²³⁵U	1δ	²⁰⁶Pb/²³⁸U	1δ	²⁰⁷Pb/²⁰⁶Pb	1δ	²⁰⁷Pb/²³⁵U	1δ	²⁰⁶Pb/²³⁸U	1δ
H62-RZ1-03	120	204	0.59	0.0880	0.0047	0.7657	0.0340	0.0641	0.0014	1383	103.7	577	19.5	401	8.8
H62-RZ1-04	9	94	0.10	0.0774	0.0048	0.7048	0.0477	0.0660	0.0017	1132	122.7	542	28.4	412	10.2
H62-RZ1-05	9	251	0.04	0.0735	0.0024	0.6662	0.0295	0.0655	0.0013	1028	62.8	518	18.0	409	7.9
H62-RZ1-06	234	294	0.79	0.0727	0.0029	0.6518	0.0264	0.0651	0.0006	1006	81.5	510	16.2	406	3.9
H62-RZ1-07	297	364	0.82	0.0718	0.0041	0.6459	0.0384	0.0652	0.0007	989	115.3	506	23.7	407	4.5
H62-RZ1-09	37	146	0.26	0.0697	0.0031	0.6280	0.0302	0.0653	0.0008	920	90.7	495	18.8	408	4.6
H62-RZ1-10	652	613	1.06	0.0613	0.0020	0.5492	0.0295	0.0652	0.0033	650	72.2	444	19.3	407	19.9
H62-RZ1-11	282	348	0.81	0.0607	0.0019	0.5462	0.0172	0.0653	0.0006	628	66.7	442	11.3	408	3.9
H62-RZ1-12	197	242	0.81	0.0607	0.0020	0.5563	0.0214	0.0664	0.0008	628	72.2	449	14.0	414	5.1
H62-RZ1-13	382	519	0.74	0.0612	0.0023	0.5587	0.0169	0.0666	0.0015	656	81.5	451	11.0	416	9.2
H62-RZ1-14	188	291	0.65	0.0596	0.0022	0.5369	0.0211	0.0652	0.0007	587	113.9	436	13.9	407	4.2
H62-RZ1-15	434	418	1.04	0.0593	0.0022	0.5327	0.0211	0.0652	0.0007	576	78.7	434	14.0	407	4.3
H62-RZ1-16	446	500	0.89	0.0596	0.0023	0.5504	0.0200	0.0672	0.0011	587	115.7	445	13.1	419	6.7
H62-RZ1-17	191	252	0.76	0.0594	0.0015	0.5464	0.0127	0.0669	0.0010	583	55.5	443	8.3	417	5.8
H62-RZ1-18	10	95	0.10	0.0529	0.0040	0.4717	0.0341	0.0656	0.0014	324	170.3	392	23.6	409	8.2
H62-RZ1-19	653	764	0.86	0.0593	0.0044	0.5333	0.0284	0.0662	0.0011	576	162.9	434	18.8	413	6.7
H62-RZ1-20	195	312	0.63	0.0529	0.0018	0.4840	0.0195	0.0664	0.0017	324	71.3	401	13.4	414	10.0
H62-RZ1-24	91	184	0.50	0.0570	0.0024	0.5131	0.0234	0.0657	0.0019	500	99.1	421	15.7	410	11.5
H62-RZ1-25	208	334	0.62	0.0569	0.0014	0.5206	0.0145	0.0665	0.0012	487	55.6	426	9.7	415	7.3
H62-RZ1-26	29	393	0.07	0.0565	0.0014	0.5217	0.0149	0.0669	0.0009	472	53.7	426	9.9	417	5.4
H62-RZ1-27	3	105	0.03	0.0536	0.0044	0.4858	0.0332	0.0655	0.0022	367	185.2	402	22.7	409	13.2
H62-RZ1-28	254	339	0.75	0.0547	0.0017	0.4978	0.0190	0.0658	0.0009	398	66.7	410	12.9	411	5.4
H62-RZ1-29	71	139	0.51	0.0555	0.0027	0.5008	0.0225	0.0659	0.0012	432	109.2	412	15.2	411	7.0
H62-RZ1-30	241	321	0.75	0.0558	0.0017	0.5071	0.0149	0.0661	0.0009	443	66.7	416	10.0	413	5.3
H62-RZ1-31	318	438	0.72	0.0548	0.0016	0.5008	0.0142	0.0665	0.0010	467	69.4	412	9.6	415	5.9

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表 4 红柳沟辉长岩锆石Lu-Hf同位素分析结果

Table 4. Zircon Hf isotopic data for the Hongliugou gabbro

测点号	¹⁷⁶Yb/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf	2σ	年龄（Ma）	εHf （0）	εHf （t）	T_DM1 （Ma）	T_DM2 （Ma）	f_Lu/Hf
H62-RZ1-03	0.116058	0.001210	0.003363	0.000048	0.282657	0.000024	401	−4.07	3.86	898.6	1146.0	−0.899
H62-RZ1-05	0.046197	0.000359	0.001391	0.000012	0.282542	0.000033	409	−8.15	0.48	1015.0	1367.1	−0.958
H62-RZ1-10	0.040480	0.000183	0.001150	0.000006	0.282705	0.000046	407	−2.38	6.27	778.1	997.6	−0.965
H62-RZ1-11	0.033934	0.000073	0.001120	0.000002	0.282491	0.000024	408	−9.94	−1.27	1079.3	1477.1	−0.966
H62-RZ1-12	0.110041	0.000667	0.003024	0.000017	0.282578	0.000069	414	−6.88	1.42	1008.1	1311.7	−0.909
H62-RZ1-13	0.114382	0.001270	0.003538	0.000037	0.282745	0.000039	416	−0.94	7.24	769.4	942.5	−0.893
H62-RZ1-14	0.053794	0.000894	0.001635	0.000028	0.282534	0.000105	407	−8.43	0.08	1033.2	1390.6	−0.951
H62-RZ1-15	0.097250	0.001810	0.002924	0.000046	0.282529	0.000074	407	−8.61	−0.44	1077.7	1423.4	−0.912
H62-RZ1-16	0.060179	0.000714	0.001907	0.000021	0.282689	0.000028	419	−2.94	5.76	816.7	1039.0	−0.943
H62-RZ1-17	0.106043	0.001360	0.003139	0.000037	0.282690	0.000055	417	−2.91	5.42	843.8	1059.7	−0.905
H62-RZ1-18	0.154616	0.002070	0.004256	0.000057	0.282649	0.000049	409	−4.36	3.50	934.5	1175.4	−0.872
H62-RZ1-19	0.050009	0.000531	0.001423	0.000020	0.282631	0.000024	413	−4.97	3.73	888.2	1163.7	−0.957
H62-RZ1-20	0.049060	0.000338	0.001494	0.000006	0.282728	0.000044	414	−1.55	7.17	751.7	946.2	−0.955
H62-RZ1-25	0.088510	0.000480	0.002601	0.000024	0.282631	0.000018	415	−5.00	3.42	918.3	1184.8	−0.922
H62-RZ1-26	0.056476	0.000804	0.001639	0.000024	0.282557	0.000022	417	−7.59	1.14	999.2	1331.2	−0.951
H62-RZ1-27	0.092919	0.000309	0.002561	0.000009	0.282575	0.000056	409	−6.97	1.34	999.1	1312.4	−0.923
H62-RZ1-28	0.017302	0.000215	0.000572	0.000007	0.282492	0.000027	411	−9.89	−1.00	1061.7	1462.5	−0.983
H62-RZ1-29	0.114128	0.000995	0.003262	0.000024	0.282788	0.000066	411	0.57	8.75	699.0	843.1	−0.902
H62-RZ1-30	0.076111	0.000460	0.002223	0.000012	0.282695	0.000088	413	−2.73	5.76	815.2	1034.7	−0.933

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