湘东北正冲金矿床成因：年代学和硫同位素制约

doi:10.11872/j.issn.1005-2518.2023.02.181

Abstract

Abstract:

The Zhengchong gold deposit is a typical gold deposit in northeast Hunan.Its orebodies are controlled by NNE and NW trending faults and occur in Lengjiaxi Group with low metamorphism.The ore-forming age and the source of ore-forming materials are still controversial.In this study，by using the LA-（MC）-ICP-MS analysis method，in situ Rb-Sr dating of sericite in gold-bearing quartz vein and in situ S isotope analysis of pyrite were carried out to determine the ore-forming age and source of ore-forming materials，so as to clarify the genesis of the deposit.According to the ore-vein interpenetrating relationship of ore-veins and mineral paragenesis， the mineralization can be divided into three ore-forming stages，namely quartz-pyrite-gold stage，quartz-pyrite-arsenopyrite-polymetallic sulfide stage，quartz-calcite stage.Microscopic observation show that sericite in stage 1 and stage 2 had a close intergrow with pyrite/arsenopyrite.In situ Rb-Sr dating of sericite show that the ore-forming ages of stage 1 and stage 2 were （219.1±6.0）Ma and （215.8±7.7）Ma，respectively.Three kinds of pyrite were identified under the backscattering （BSE） image.The pyrite （Py1） in stage 1 is mainly eudedral and medium-coarse-grained，with δ³⁴S ranging from -3.86‰ to 1.03‰.The pyrite （Py2） in stage 2 has an euhedral，mesocoarse-grained structure and an obvious core-rim zonation.The core （Py2a） is uniform in the BSE image with δ³⁴S ranging from -1.43‰ to 1.51‰，while the edge （Py2b） has an obvious oscillation zone and other sulfide （galena） inclusions，with δ³⁴S ranging from -3.21‰ to 1.95‰.The δ³⁴S values （-3.85‰~1.95‰） of the three types of pyrite are close to 0 and the negative value moves to positive value，indicating that deep magmatic （or mantle-derived） materials may be the main source of ore-forming materials in Zhengchong gold deposit，and a small amount of stratigraphic material is involved in the mineralization.Based on the geological characteristics，metallogenic chronology and sulfur isotope geochemistry，We believe that the Zhengchong gold deposit was formed in the Indosinian intracontinental orogenic environment and related to deep magmatic activity.

Key words: Rb-Sr isotope of sericite, sulfur isotope, source of ore-forming materials, metallogenic age, Zhengchong gold deposit, Jiangnan orogenic belt

CLC Number:

P618.51

Huahao WU,Yongjun SHAO,Qingquan LIU,Zhilin WANG,Yuce ZHANG,Zikun YUAN. Genesis of the Zhengchong Gold Deposit in Northeast Hunan—Constraints from Geochronology and In-situ Sulfur Isotope[J].Gold Science and Technology, 2023, 31(2): 190-205.

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样品编号	阶段	位置/m	黄铁矿类型	描述
330-11	石英—黄铁矿—自然金阶段	330	Py1	石英—黄铁矿硫化物脉，由黄铁矿和自然金等矿物组成
240-11	石英—黄铁矿—毒砂多金属硫化物阶段	240	Py2	纹层状石英硫化物脉（0.5~5.0 cm），由细粒黄铁矿和石英组成
D037-8-2	石英—黄铁矿—毒砂多金属硫化物阶段	290	Py2	石英金属硫化物脉，由黄铁矿和毒砂等矿物组成
240-5	石英方解石阶段	240		由石英和方解石组成，切穿早期的石英硫化物脉

样品编号	黄铁矿阶段	δ³⁴S_V-CDT /‰	样品编号	黄铁矿阶段	δ³⁴S_V-CDT /‰
240-4-1	Py1	-3.24	D037-8-2-11	Py2b	1.49
240-4-2	Py1	-2.44	D037-8-2-12	Py2b	1.49
240-5-1	Py1	-3.52	D037-8-2-13	Py2b	0.69
240-5-2	Py1	-3.86	D037-8-2-14	Py2b	1.23
240-5-3	Py1	-3.62	D037-8-2-15	Py2b	1.43
D034-4-1	Py1	1.03	D037-8-2-16	Py2b	1.68
D034-4-2	Py1	0.73	D037-8-2-17	Py2a	1.14
D034-4-3	Py1	0.71	D037-8-2-18	Py2a	0.91
D034-4-4	Py1	0.78	D037-8-2-19	Py2b	1.71
D034-4-5	Py1	0.02	D037-8-2-20	Py2a	0.79
D037-8-2-1	Py2b	1.95	D037-8-2-21	Py2a	0.43
D037-8-2-2	Py2a	-0.99	D037-8-2-22	Py2a	0.17
D037-8-2-3	Py2a	1.51	240-11-1	Py2b	-0.64
D037-8-2-4	Py2b	1.04	240-11-2	Py2b	-0.05
D037-8-2-5	Py2b	1.75	240-11-3	Py2a	-1.43
D037-8-2-6	Py2a	-0.25	240-11-4	Py2b	-3.21
D037-8-2-7	Py2a	0.43	240-11-5	Py2a	-0.60
D037-8-2-8	Py2b	1.37	240-11-6	Py2a	-0.35
D037-8-2-9	Py2a	0.18	240-11-7	Py2b	0.49
D037-8-2-10	Py2a	0.76	240-11-8	Py2a	0.89

成矿阶段	⁸⁷Rb/⁸⁶Sr	±1s	⁸⁷Sr/⁸⁶Sr	±1s
石英—黄铁矿—自然金阶段	16.458	0.915	0.814	0.005
	17.095	0.253	0.817	0.006
	17.526	0.756	0.811	0.005
	19.577	1.376	0.816	0.007
	23.609	0.843	0.825	0.007
	19.725	0.416	0.820	0.005
	21.880	0.653	0.830	0.008
	31.139	0.786	0.845	0.009
	23.210	0.671	0.813	0.008
	27.085	0.754	0.832	0.013
	31.905	1.293	0.851	0.010
	24.594	1.552	0.844	0.016
	25.624	2.283	0.850	0.008
	18.547	0.425	0.803	0.006
	20.072	0.556	0.817	0.006
	19.858	0.793	0.823	0.009
	44.992	1.413	0.891	0.012
	45.778	2.375	0.915	0.017
	16.835	0.740	0.812	0.005
	31.780	0.728	0.861	0.010
	14.959	0.964	0.813	0.012
	70.953	0.140	0.976	0.004
	36.266	1.035	0.890	0.018
	26.395	0.688	0.854	0.007
	31.472	0.761	0.850	0.008
石英—黄铁矿—毒砂多金属硫化物阶段	33.424	0.964	0.883	0.010
	31.254	0.981	0.876	0.007
	28.207	1.655	0.858	0.008
	33.539	0.823	0.881	0.010
	36.499	0.997	0.883	0.009
	70.494	2.591	0.996	0.013
	67.204	2.528	0.967	0.013
	81.845	4.580	1.028	0.022
	33.016	1.246	0.848	0.013
	66.180	2.815	0.974	0.020
	59.609	1.668	0.943	0.020
	97.567	0.190	1.070	0.006

[1]	Shengwei ZHANG,Teng DENG,Deru XU,Yueqiang ZHOU,Guojun DONG,Zenghua LI,Wen MA,Ke XU,Yan HAI. Genesis of Carbonaceous Material in the Wangu Gold Deposit and Its Relationship with Gold Mineralization [J]. Gold Science and Technology, 2022, 30(6): 835-847.
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[3]	Ke XU, Deru XU. Study on the Formation Mechanism of Altered Rock Type Gold Mineralization of Huangjindong Gold Deposit in Jiangnan Orogenic Belt [J]. Gold Science and Technology, 2022, 30(2): 151-164.
[4]	Gaizhong LIANG,Kuifeng YANG,Hongrui FAN,Xinghui LI. Genesis of Colloidal Pyrite and Its Metallogenic Significance in Asiha Gold Deposit，East Kunlun [J]. Gold Science and Technology, 2022, 30(1): 19-33.
[5]	Zhenju ZHOU,Yanjing CHEN,Haoshu TANG,Yanshuang WU,Zhengle CHEN. Sr-Nd Isotope Constraints on the Source of Ore-forming Elements of Zankan Iron Deposit in the Taxkorgan Terrane of West Kunlun Orogen [J]. Gold Science and Technology, 2018, 26(4): 454-464.
[6]	LI Gangzhu ，JIA Yuanqin ，ZHANG Biao ，CHEN Kena ，HU Peiqing. Metallogenic Process of the Baiyinhaer Gold Deposit [J]. J4, 2008, 16(3): 6-12.

Genesis of the Zhengchong Gold Deposit in Northeast Hunan—Constraints from Geochronology and In-situ Sulfur Isotope

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成矿阶段	黄铁矿结构	样品数量/个	δ³⁴S_V-CDT/‰
成矿阶段	黄铁矿结构	样品数量/个	平均值	最大值	最小值
石英—黄铁矿—自然金阶段	Py1	10	-1.34	1.03	-3.86
石英—黄铁矿—毒砂多金属硫化物阶段	Py2a	15	0.24	1.51	-1.43
石英—黄铁矿—毒砂多金属硫化物阶段	Py2b	15	0.83	1.95	-3.21