西藏东窝东矿床矿化蚀变过程元素迁移及绢云母<sup>40</sup>Ar-<sup>39</sup>Ar年代学及其地质意义

侯淋; 唐菊兴; 林彬; 宋扬; 王勤; 李玉彬; 冯军; 李彦波; 陈列; 唐晓倩

doi:10.15898/j.cnki.11-2131/td.201612050179

西藏东窝东矿床矿化蚀变过程元素迁移及绢云母⁴⁰Ar-³⁹Ar年代学及其地质意义

1.
中国地质大学(北京)地球科学与资源学院, 北京 100083

2.
中国地质科学院矿产资源研究所, 北京 100037

3.
成都理工大学, 四川成都 610059

4.
西藏自治区地质调查院, 西藏拉萨 850012

5.
西藏金龙矿业股份有限公司, 西藏拉萨 850000

6.
西藏地质矿产勘查开发局第五地质大队, 青海格尔木 816000

7.
北京中矿联咨询中心, 北京 100044

基金项目:
国家公益性行业科研专项"斑岩-浅成低温热液成矿系统研究及勘查评价示范——以西藏多龙整装勘查区为例"（201511017）

详细信息

作者简介: 侯淋, 在读硕士研究生, 矿物学、岩石学、矿床学专业。E-mail:1126570067@qq.com

通讯作者: 宋扬, 副研究员, 主要从事矿产勘查和区域成矿规律研究。E-mail:songyang100@126.com

中图分类号: P619.273;P597.3

收稿日期: 2016-12-05

修回日期: 2017-07-12

录用日期: 2017-07-20

Element Migration during Alteration and ⁴⁰Ar/³⁹Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance

1.
School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

3.
Chengdu University of Technology, Chengdu 610059, China

4.
Tibet Institute of Geological Survey, Lhasa 850012, China

5.
Golden Dragon Mining Co., LTD., Lhasa 850000, China

6.
No.5 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Golmud 816000, China

7.
China Mining Federation of Beijing Consulting Center, Beijing 100044, China

More Information

Corresponding author: Yang SONG, songyang100@126.com

Received Date: 05 December 2016

Revised Date: 12 July 2017

Accepted Date: 20 July 2017

摘要

摘要: 东窝东铜多金属矿床位于羌塘地体南缘，多龙铜金矿集区东侧。该矿床尚未开展矿化蚀变时限、成矿作用中元素迁移特征等问题的研究。为确定矿床的蚀变矿化作用时限，本文对东窝东矿床的黄铁绢英岩化蚀变带中的蚀变绢云母进行了⁴⁰Ar-³⁹Ar年代学测试，获得⁴⁰Ar-³⁹Ar坪年龄为122.20±0.84 Ma，该年龄与已有的斑岩体侵位时代（122 Ma）一致，说明东窝东矿床黄铁绢英岩化蚀变与斑岩体侵位有密切联系。此外，对比分析地表弱蚀变和钻孔中强黄铁绢英岩化花岗闪长斑岩的岩石地球化学结果，运用"等浓度线（isocon）方程"及其推导方程，探讨黄铁绢英岩化蚀变过程中的不同元素的带入、带出特点及元素迁移特征。结果表明：高场强元素质量基本守恒；轻稀土元素较重稀土元素迁移量较大，但总体上稀土元素的迁移程度较弱；主要的成矿元素Cu、Pb、Zn为带入元素。东窝东矿床含矿斑岩侵位时代和热液蚀变时限均与多龙矿集区内多不杂、波龙、铁格隆南等多个超大型-大型铜金矿床一致，说明东窝东矿床和多龙矿集区内的多个矿床受控于同一构造-岩浆成矿背景，东窝东矿区具有重要的找矿潜力。
- 绢云母 /
- ⁴⁰Ar-³⁹Ar年代学 /
- 元素迁移 /
- 东窝东矿床 /
- 西藏
Abstract: The Dongwodong copper polymetallic deposit is located in the southern margin of Qiangtang terrane, east of the Duolong copper gold ore cluster. The study on the timing of alteration and element migration during the alteration has not yet been conducted. To determine the time of alteration, ⁴⁰Ar-³⁹Ar isotopic dating was carried out for altered sericites closely related to beresitizate mineralization. The results show that the plateau age is 122.20±0.84 Ma, which is consistent with the age (122 Ma) of ore-bearing porphyry. Thus, there is a close link between the mineralization and granodiorite porphyry. Meanwhile, the geochemical results of weakly-altered and mineralized granodiorite were compared, using the isocon equation and the derivation equation to judge the inclusion or extraction of each element and the element migration during the alteration. Results show that HFSEs are very immobile during the alteration, whereas REEs migrate insignificantly with more obvious migration of LREEs than HREEs. The ore-forming elements (Cu, Pb, Zn) are inclusion elements. The intrusive age of ore-bearing phophyries and the timing of hydrothermal alteration of Dongwodong deposit are consistent with those of other large-superlarge scale copper-gold deposits (Duobuza, Bolong, Tegelongnan) in Duolong copper gold ore cluster, indicating that they were controlled by the same tectonic-magmatic event and thus a great potential of ore-prospecting in Dongwodong mining district can be predicted.
- sericite /
- ⁴⁰Ar-³⁹Ar isotopic dating /
- element migration /
- Dongwodong deposit /
- Tibet

HTML全文

图 1 东窝东矿区地质简图

Figure 1.

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图 2 东窝东矿区ZK0001典型矿石组构

Figure 2.

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图 3 东窝东矿床绢云母的(a)⁴⁰Ar-³⁹Ar年龄谱图、(b)等时线图及(c)反等时线图

Figure 3.

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表 1 东窝东矿区蚀变绢云母(样品号ZK0001-270) 的⁴⁰Ar-³⁹Ar测试结果

Table 1. Analytical results of ⁴⁰Ar-³⁹Ar for sericite (sample No.ZK0001-270) in Dongwodong deposit

温度(℃)	(⁴⁰Ar/³⁹Ar)_m	(³⁶Ar/³⁹Ar)_m	(³⁷Ar/³⁹Ar)_m	(³⁸Ar/³⁹Ar)_m	⁴⁰Ar(%)	⁴⁰Ar^*/³⁹Ar	³⁹Ar(×10^-14 mol)	累计³⁹Ar	年龄±1σ(Ma)
700	100.2271	0.3252	1.5877	0.1091	4.22	4.2323	0.04	0.18	36±16
770	27.7185	0.0535	0.3097	0.0263	43.01	11.9242	0.32	1.49	99.3±1.4
810	20.9904	0.0224	0.0964	0.0184	68.54	14.3888	1.14	6.15	119.2±1.3
850	17.5696	0.0086	0.0364	0.0144	85.51	15.0236	2.06	14.6	124.3±1.2
890	16.8681	0.0067	0.0311	0.0138	88.3	14.8947	1.97	22.66	123.3±1.2
920	17.0405	0.0076	0.0513	0.0142	86.74	14.7809	2.27	31.97	122.4±1.2
950	16.7456	0.0069	0.0367	0.0139	87.81	14.7042	2.36	41.65	121.7±1.2
980	16.5232	0.0064	0.0248	0.0138	88.61	14.6417	2.81	53.15	121.2±1.2
1020	16.2696	0.0053	0.0246	0.0137	90.38	14.705	3.61	67.94	121.8±1.2
1060	16.629	0.0064	0.0123	0.014	88.67	14.7447	3.31	81.51	122.1±1.2
1120	18.2743	0.0125	0.0503	0.0155	79.84	14.5915	2.47	91.61	120.8±1.2
1200	22.0329	0.0261	0.1623	0.02	65.01	14.3256	1	95.72	118.7±1.2
1400	19.7675	0.0188	0.3374	0.0305	71.93	14.2236	1.04	100	117.9±1.3
注：样品质量m=16.55 mg，辐照参数J=0.004748。

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表 2 多龙矿集区与东窝东矿床含矿岩体侵位时代及热液蚀变年龄

Table 2. Geochronology of ore-bearing intrusions and hydrothermal alteration from Duolong ore concentration area and Dongwodong deposit, Tibet

矿床名称	含矿岩体岩性	岩体侵位时代(Ma)	参考文献	热液蚀变年龄(Ma)	参考文献
多不杂	花岗闪长斑岩	117.5±1.2~119.5±0.7	孙嘉^[4]	115.8±1.4~118.1±1.3	孙嘉^[4]；Li等^[3]
多不杂	石英闪长斑岩	116.4±2.5~127.8±2.6	曲晓明等^[1]；Li等^[2-3]	115.8±1.4~118.1±1.3	孙嘉^[4]；Li等^[3]
波龙	花岗闪长斑岩	117.5±1.0~120.9 ±2.4	佘宏全等^[5]；Li等^[3]；陈华安等^[8]	117.9±0.7~121.6±0.7	祝向平等^[6]；孙嘉^[4]
波龙	石英闪长玢岩	118.4±1.1~122.3±1.0	Li等^[3]；吕立娜^[7]	117.9±0.7~121.6±0.7	祝向平等^[6]；孙嘉^[4]
铁格隆南	花岗闪长斑岩	121.1±0.5	孙嘉^[4]；Lin等^[9]	116.3±0.8	杨超^[10]
铁格隆南	石英闪长玢岩	120.2±1.0	方向等^[11]	116.3±0.8	杨超^[10]
东窝东	花岗闪长斑岩	122.8±1.4	林彬等(待刊)^[14]	122.20±0.84	本文

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表 3 东窝东矿区花岗闪长斑岩和黄铁绢英岩化花岗闪长斑岩主量、稀土元素和微量元素分析结果

Table 3. Analytical results of major, rare earth and trace elements for granodiorite and beresitizated granodiorite from Dongwodong deposit

元素	弱蚀变花岗闪长斑岩					矿化花岗闪长斑岩					ΔC_i
元素	DL2014-06	DL2014-07	DL2014-08	DL2014-09	C_i^O	ZK0001-262	ZK0001-268	ZK0001-270	ZK0001-300	C_i^A	ΔC_i
SiO₂	66.30	61.84	62.22	63.96	63.58	65.96	63.09	65.41	SiO₂0	SiO₂1	SiO₂2
Al₂O₃	14.87	16.19	15.66	14.42	15.29	14.44	14.87	14.90	Al₂O₃0	Al₂O₃1	Al₂O₃2
Fe₂O₃	3.50	5.26	4.64	6.03	4.86	4.22	3.53	3.11	Fe₂O₃0	Fe₂O₃1	Fe₂O₃2
MgO	1.33	1.72	1.56	1.45	1.52	1.32	1.97	1.63	MgO0	MgO1	MgO2
CaO	3.40	4.52	4.25	3.27	3.86	1.64	3.29	2.38	CaO0	CaO1	CaO2
Na₂O	3.14	3.62	3.61	3.22	3.40	0.06	0.08	0.07	Na₂O0	Na₂O1	Na₂O2
K₂O	4.84	4.12	3.66	4.22	4.21	3.52	3.89	3.85	K₂O0	K₂O1	K₂O2
TiO₂	0.63	0.77	0.73	0.71	0.71	0.51	0.53	0.53	TiO₂0	TiO₂1	TiO₂2
MnO	0.06	0.08	0.05	0.05	0.06	0.21	0.15	0.14	MnO0	MnO1	MnO2
P₂O₅	0.17	0.21	0.21	0.19	0.20	0.17	0.17	0.17	P₂O₅0	P₂O₅1	P₂O₅2
LOI	1.09	1.04	2.78	1.83	-	6.94	7.94	7.34	LOI0	LOI1	LOI2
Li	36.64	38.02	37.78	112.85	56.32	28.80	25.90	24.50	Li0	Li1	Li2
Ba	608.04	627.84	590.22	601.39	606.87	263.00	2.46	610.00	Ba0	Ba1	Ba2
Cs	1.99	2.10	3.14	7.86	3.77	5.68	6.46	6.97	Cs0	Cs1	Cs2
Cr	9.11	9.59	6.98	15.20	10.22	26.60	43.80	74.90	Cr0	Cr1	Cr2
Co	5.03	5.31	7.34	12.74	7.61	2.09	1.87	1.24	Co0	Co1	Co2
Ni	4.07	4.53	2.98	5.04	4.16	8.22	9.92	6.33	Ni0	Ni1	Ni2
Cu	14.34	15.19	36.61	53.27	29.85	126.00	231.00	117.00	Cu0	Cu1	Cu2
Zn	48.27	49.79	40.00	60.80	49.72	153.00	178.00	120.00	Zn0	Zn1	Zn2
Ga	19.10	20.30	20.16	27.86	21.86	23.10	23.10	20.90	Ga0	Ga1	Ga2
Rb	123.98	130.24	119.68	182.89	139.20	180.00	205.00	202.00	Rb0	Rb1	Rb2
Sr	496.20	521.80	558.00	592.35	542.09	62.90	91.20	52.20	Sr0	Sr1	Sr2
Nb	30.50	32.00	30.50	40.23	33.31	22.50	25.40	24.10	Nb0	Nb1	Nb2
Ta	1.91	2.00	1.88	2.16	1.99	1.63	1.87	1.72	Ta0	Ta1	Ta2
Pb	16.75	17.43	14.17	16.60	16.24	19.20	10.20	2.76	Pb0	Pb1	Pb2
U	3.50	3.68	3.15	2.14	3.12	2.96	12.30	3.95	U0	U1	U2
Th	14.87	15.63	16.26	12.29	14.76	11.20	11.80	12.00	Th0	Th1	Th2
Zr	229.40	240.20	242.00	235.01	236.65	185.00	177.00	179.00	Zr0	Zr1	Zr2
Hf	6.00	6.33	6.40	3.61	5.59	5.22	5.28	5.15	Hf0	Hf1	Hf2
La	40.97	42.89	48.60	33.50	41.49	56.30	60.50	46.30	La0	La1	La2
Ce	84.10	88.00	88.88	62.53	80.88	95.40	102.00	84.10	Ce0	Ce1	Ce2
Pr	10.06	10.57	9.82	7.12	9.39	10.90	11.60	9.53	Pr0	Pr1	Pr2
Nd	35.95	37.93	33.98	25.19	33.26	41.00	43.00	33.60	Nd0	Nd1	Nd2
Sm	6.99	7.28	6.45	4.90	6.41	6.99	7.62	6.42	Sm0	Sm1	Sm2
Eu	1.93	2.04	1.96	1.47	1.85	1.52	2.11	1.98	Eu0	Eu1	Eu2
Gd	6.26	6.57	5.88	4.61	5.83	5.38	5.88	4.86	Gd0	Gd1	Gd2
Tb	0.94	0.99	0.88	0.67	0.87	0.74	0.85	0.79	Tb0	Tb1	Tb2
Dy	5.23	5.51	5.01	3.76	4.88	3.92	4.28	4.36	Dy0	Dy1	Dy2
Ho	1.07	1.11	1.03	0.76	0.99	0.63	0.67	0.73	Ho0	Ho1	Ho2
Er	2.98	3.13	2.89	2.12	2.78	1.91	1.97	2.13	Er0	Er1	Er2
Tm	0.44	0.46	0.42	0.30	0.41	0.31	0.32	0.34	Tm0	Tm1	Tm2
Yb	2.83	2.94	2.73	1.99	2.62	1.89	1.98	2.16	Yb0	Yb1	Yb2
Lu	0.43	0.45	0.42	0.29	0.40	0.27	0.29	0.30	Lu0	Lu1	Lu2
Y	27.64	28.92	26.60	28.82	28.00	17.80	19.10	20.70	Y0	Y1	Y2
注：① 样品DL2014-06、DL2014-07、DL2014-08、DL2014-09的主量、微量元素数据引用自韦少港等^[16]。
② 主量元素含量单位为%，稀土及微量元素含量单位为×10^-6。
③ C_i^O、C_i^A分别为原岩、蚀变岩中第i种元素含量，为所采样品的平均值。元素迁移量ΔC_i=C_i^A/k-C_i^O(本文选取TiO₂作为不活动元素，k值为蚀变岩中TiO₂含量与原岩中TiO₂含量比值)。

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西藏东窝东矿床矿化蚀变过程元素迁移及绢云母40Ar-39Ar年代学及其地质意义

作者简介: 侯淋, 在读硕士研究生, 矿物学、岩石学、矿床学专业。E-mail:1126570067@qq.com

通讯作者: 宋扬, 副研究员, 主要从事矿产勘查和区域成矿规律研究。E-mail:songyang100@126.com

Element Migration during Alteration and 40Ar/39Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance

Corresponding author: Yang SONG, songyang100@126.com

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西藏东窝东矿床矿化蚀变过程元素迁移及绢云母⁴⁰Ar-³⁹Ar年代学及其地质意义

Element Migration during Alteration and ⁴⁰Ar/³⁹Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance