Age-dating of Sulfide Re-Os in Quartz Vein-type Copper Deposits in Longwei Area, Guangxi and Its Significance

doi:10.19657/j.geoscience.1000-8527.2022.04.17

Abstract

Abstract:

There are a large number of quartz vein-type copper deposits exposed in northwest Dayaoshan, Guang- xi,but there is a lack of research on the age of related mineral deposits. To solve this problem, the paper selects pyrite and chalcopyrite in quartz vein-type copper deposits in Jinxiu Longwei area for Re-Os isotopic age-dating research. It is concluded that the isochron age of pyrite is (417±25) Ma (MSWD=0.92), which belongs to Caledonian period; the isochron age of chalcopyrite is (243±18) Ma (MSWD=0.45), which belongs to Indosinian period. Pyrite crystallization is obviously earlier than chalcopyrite, and whether there are metallogenic events in Caledonian period needs further study. In combination with rock mineralogical analysis, we think that the mineralization in the copper deposits in Longwei area experienced the processes of pyrite crystallization, pyrite fragmentation and copper-bearing hydrothermal solution filling and metasomatism in Indosinian period, and finally consolidated into mine. The metallogenic time of copper deposits in Longwei area was determined in the research, which provided evidence for the existence of metallogenic hydrothermal event in Indosinian period in the northwest of Dayaoshan.

Key words: Longwei area, quartz vein-type copper deposits, Re-Os dating, Guangxi

CLC Number:

P618.41
P597

FU Song, LI Shehong, MA Wenen, JIANG Chao, XIE Zhuolin, WU Jinming, HU Xuhan, ZHANG Zitong. Age-dating of Sulfide Re-Os in Quartz Vein-type Copper Deposits in Longwei Area, Guangxi and Its Significance[J]. Geoscience, 2022, 36(04): 1146-1154.

Figures/Tables 10

References 41

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样品号	Re/10^-12			Os/10^-12			¹⁸⁷Re/¹⁸⁸Os			¹⁸⁷Os/¹⁸⁸Os
样品号	测定值	2σ		测定值	2σ		测定值	2σ		测定值	2σ
HY-2	195.07	11.27	1.792		0.015	1 513.22		88.35	14.58		0.13
HY-3	44.24	5.26	0.255		0.025	3 313.98		509.50	22.83		0.29
HY-4	23.87	6.90	1.118		0.011	227.58		65.83	9.42		0.09
HY-5	36.17	8.44	1.345		0.014	279.86		74.31	9.72		0.10
HY-6	318.41	21.96	2.964		0.057	573.53		81.08	10.96		0.14

样品号	Re/10^-12			Os/10^-12			¹⁸⁷Re/¹⁸⁸Os			¹⁸⁷Os/¹⁸⁸Os
样品号	测定值	2σ		测定值	2σ		测定值	2σ		测定值	2σ
HY-2	195.07	11.27	1.792		0.015	1 513.22		88.35	14.58		0.13
HY-3	44.24	5.26	0.255		0.025	3 313.98		509.50	22.83		0.29
HY-4	23.87	6.90	1.118		0.011	227.58		65.83	9.42		0.09
HY-5	36.17	8.44	1.345		0.014	279.86		74.31	9.72		0.10
HY-6	318.41	21.96	2.964		0.057	573.53		81.08	10.96		0.14

样品号	Re/10^-12			Os/10^-12			¹⁸⁷Re/¹⁸⁸Os			¹⁸⁷Os/¹⁸⁸Os
样品号	测定值	2σ		测定值	2σ		测定值	2σ		测定值	2σ
TY-2	262.90	13.29	1.487		0.021	2 851.01		149.62	18.12		0.24
TY-3	141.93	5.69	0.878		0.068	6 512.37		470.08	41.54		0.51
TY-4	195.68	14.09	1.391		0.013	1 185.33		86.05	5.88		0.08
TY-5	175.40	12.54	1.070		0.013	1 082.95		66.66	5.12		0.06
TY-6	115.16	11.70	0.467		0.019	3 589.15		392.49	21.61		0.26

样品号	Re/10^-12			Os/10^-12			¹⁸⁷Re/¹⁸⁸Os			¹⁸⁷Os/¹⁸⁸Os
样品号	测定值	2σ		测定值	2σ		测定值	2σ		测定值	2σ
TY-2	262.90	13.29	1.487		0.021	2 851.01		149.62	18.12		0.24
TY-3	141.93	5.69	0.878		0.068	6 512.37		470.08	41.54		0.51
TY-4	195.68	14.09	1.391		0.013	1 185.33		86.05	5.88		0.08
TY-5	175.40	12.54	1.070		0.013	1 082.95		66.66	5.12		0.06
TY-6	115.16	11.70	0.467		0.019	3 589.15		392.49	21.61		0.26