东昆仑西段阿其音金矿绢云母Ar-Ar测年及其地质意义

doi:10.11872/j.issn.1005-2518.2023.03.182

Abstract

Abstract:

The East Kunlun metallogenic belt is an important gold and other metal metallogenic belt in Qinghai Province，but it is mostly concentrated in the eastern part of the East Kunlun.The western part of the East Kunlun not only has a small number of deposits， but also has a small scale of ore deposits.Meanwhile，the research on the genesis of the deposits is weak and the prospecting potential is unknown，which become the bottleneck restricting the breakthrough of gold prospecting in the western part of the East Kunlun.The discovery of Aqiyin gold ore deposit can not only enrich the types of gold deposit in the East Kunlun metallogenic belt，but also have important scientific research value to improve the understanding of gold mineralization rules in the western part of the East Kunlun.The Aqiyin gold deposit is located in the western part of the East Kunlun metallogenic belt，which is a structural ore-control gold deposit occurred in porphyritic quartz monzonite. In order to determine the metallogenic age of the gold deposit，the ⁴⁰Ar-³⁹Ar age test of sericite in the altered granite-porphyry related to gold mineralization was carried out，and the weighted average ages of sericite are （263.2±4.5）Ma and （268.7±9.7）Ma，respectively. The results show that the main ore-forming age of the Aqiyin gold deposit is the Middle Permian，which is of great significance for further understanding of the genetic mechanism and geodynamic background and regional gold exploration of the gold deposit in the western part of East Kunlun.Meanwhile，enough attention should be paid to whether there is a Middle Permian gold deposit in the East Kunlun area.

Key words: sericite, Ar-Ar dating, metallogenic epoch, Middle Permian, Aqiyin gold deposit, East Kunlun

CLC Number:

P618.51

Zhigang LIU,Aikui ZHANG,Yongle LIU,Yong ZHANG,Shuyue HE,Feifei SUN. Ar-Ar Dating of Sericite from Aqiyin Gold Deposit in the West Section of East Kunlun and Its Geological Significance[J].Gold Science and Technology, 2023, 31(3): 378-386.

Figures/Tables 7

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样品编号	加热阶段	温度/℃	⁴⁰Ar/³⁹Ar	³⁷Ar/³⁹Ar	³⁶Ar/³⁹Ar	⁴⁰Ar（r）/%	³⁹Ar（k）/%	（Age±2s）/Ma
	1	550	49.751366	0.000000	0.111075	34.02	0.16	174.86±45.83
	2	600	39.467305	0.000000	0.066591	50.14	2.40	202.81±3.91
	3	640	38.068333	0.143544	0.051947	59.70	5.32	231.11±2.32
	4	680	35.755931	0.152549	0.032200	73.42	5.15	264.44±1.84
	5	710	36.317076	0.000000	0.031163	74.64	2.90	272.41±2.48
AQYZK001	6	750	39.121845	0.270361	0.044077	66.76	29.19	263.20±1.78
	7	780	29.587880	0.091932	0.012487	87.55	13.65	261.17±1.05
	8	810	28.219098	0.021400	0.010236	89.28	15.10	254.49±0.96
	9	850	27.132901	0.137405	0.012316	86.62	8.68	238.50±1.23
	10	920	28.284008	0.085409	0.031443	67.17	3.77	195.14±2.45
	11	1 020	24.728657	0.344224	0.039174	53.29	3.26	137.60±3.72
	12	1 400	18.389849	1.624272	0.037209	40.90	10.42	79.89±1.80
	1	600	37.003033	0.561045	0.072752	42.02	4.35	162.54±3.18
	2	650	31.820847	0.113497	0.028663	73.41	3.05	238.92±2.38
	3	680	31.776327	0.489968	0.020656	80.91	7.39	261.38±1.88
	4	710	33.020082	1.607749	0.021279	81.34	6.26	272.42±2.20
	5	740	33.898360	2.209040	0.022804	80.63	9.16	276.99±1.87
AQYQZ06	6	770	32.065069	0.664519	0.011860	89.23	11.87	288.67±1.34
	7	810	28.889228	0.311043	0.004308	95.67	16.34	279.52±1.18
	8	840	27.840195	0.235063	0.005020	94.73	22.79	267.61±0.86
	9	880	26.835950	0.408568	0.007996	91.31	9.72	249.91±1.40
	10	920	28.049071	0.194034	0.011541	87.89	7.59	251.29±1.43
	11	970	29.579149	1.706830	0.021953	78.52	0.37	237.91±25.33
	12	1 400	29.901789	0.000000	0.036092	64.33	1.10	198.96±6.50

序号	矿床名称	测试对象	年龄/Ma	测试方法	文献来源
1	库德尔特金矿	绢云母	236.7±4.0	⁴⁰Ar-³⁹Ar	张爱奎等（2021）
2	肯德可克金矿	锆石	229.5±0.5	LA-ICP-MS U-Pb	肖晔等（2014）
3	哈西亚图金矿	锆石	246.8±1.8	LA-ICP-MS U-Pb	南卡俄吾等（2014）
4 5	五龙沟金矿五龙沟金矿	锆石	239±1	LA-ICP-MS U-Pb	夏锐（2017）
4 5	五龙沟金矿五龙沟金矿	绢云母	237±1	⁴⁰Ar-³⁹Ar	张德全等（2005）
6	阿斯哈金矿	锆石	238±1	LA-ICP-MS U-Pb	李金超等（2014）
7	坑得弄舍金矿	锆石	243±2	LA-ICP-MS U-Pb	夏锐（2017）
8	开荒北金矿	围岩	中三叠世	⁴⁰Ar-³⁹Ar	李金超（2017）
9	果洛龙洼金矿	白云母	202.7±1.34	⁴⁰Ar-³⁹Ar	李金超（2017）

Ar-Ar Dating of Sericite from Aqiyin Gold Deposit in the West Section of East Kunlun and Its Geological Significance

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