东昆仑阿斯哈金矿胶状黄铁矿成因及其成矿意义

doi:10.11872/j.issn.1005-2518.2022.01.051

Abstract

Abstract:

The Asiha vein-type gold deposit，located in the Eastern Kunlun orogenic belt，provides an excellent opportunity for deciphering precipitations of metals and origins of orogenic intrusion-related gold systems.Predecessors have proposed that Asiha gold deposit is an orogenic gold deposit or magmatic hydrothermal gold deposit related to intrusion body，and the genesis of the deposit is controversial.Gold precipitation is closely related to arsenic content and vulcanization，and the main precipitation mechanism is not clear.However，pyrite often occurs in many types of gold deposits，which can provide detailed mineralization information in explaining the source of ore-forming materials，the composition of ore-forming fluids and metallogenic physicochemical conditions，while colloidal pyrite with special structure can provide more important mineralization information.Pyrite is an excellent research object for constraining the genesis of ore deposits.There are two types of pyrite in Asiha gold deposit，namely，early euhedral crystalline pyrite and late colloidal pyrite.Through the study of the chemical composition and microstructure of colloidal pyrite，it is found that gold arsenic decoupling occurs in Asha gold deposit，and the gold precipitation is closely related to the particle size of pyrite.In order to clarify the genesis and gold precipitations of Asiha gold deposit，backscatter electron scanning microscope analysis，in-situ trace element analysis，area scan analysis and in-situ sulfur isotope analysis are carried out for colloidal pyrite.Colloidal pyrite is a parallel or irregular concentric ring belt with irregular complex surfaces.The transition between ribbons is a gradual transition.The bands on the strip often have the contraction pattern of the gel，and the width of the strip is 3~200 μm.Under high-power scanning electron microscope （SEM），it shows the aggregation of micron fine particles and dark gray substrate.Colloidal pyrite is rich in As （median of 3 164×10^-6），Au （median of 4.15×10^-6），Cu （median of 13 070×10^-6），Pb （median of 1 157×10^-6），Ag （median of 781.2×10^-6），Sb （median of 1 668×10^-6），but poor Co in （median of 44.48×10^-6），Ni （median of 2.96×10^-6） and Te （below the detection limit），and the Co/Ni ratio is greater than 10.The area scan shows clear zoning characteristics of As，Au，Co，Cu，Mo，Ag and Bi，and the distribution consistency of gold and arsenic is weak.The δ³⁴S value range of colloidal pyrite（+6.1‰~+6.8‰） is narrow.Combined with the in-situ trace elements，in-situ sulfur isotopes and microstructure of colloidal pyrite，it is considered that the colloidal pyrite is of magmatic hydrothermal origin，which may be a close genetic relationship with the concealed granite porphyry in the Asiha gold deposit.Arsenic and Au in colloidal pyrite precipitated rapidly under the condition of sudden temperature drop are decoupled，and the micron size pyrite is the dominant factor controlling the enrichment of solid solution gold.

Key words: colloidal pyrite, in-situ microanalysis, trace element, sulfur isotope, Asiha gold deposit, East Kunlun metallogenic belt

CLC Number:

P618.51

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.

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元素	19ash30c-1	19ash30c-2	19ash30c-3	19ash30c-4	19ash30c-5	中位数	检出限	早期结晶黄铁矿（Liang et al.， 2021）
Co	15.25	61.51	44.48	66.82	43.72	44.48	0.04	2.0
Ni	0.36	4.26	2.96	3.78	2.85	2.96	0.13	0.5
Cu	15 918	16 189	13 070	12 221	11 197	13 070	0.33	0.5
Zn	36.67	191.5	127.1	269.5	116.9	127.1	0.90	bdl
As	1 367	5 516	3 164	6 466	2 943	3 164	0.29	2090
Ag	882	889	781	630	653	781.19	1.00	bdl
Sb	1 668	2 149	1 606	2 538	1 509	1 668	0.07	0.2
Te	-0.39	-0.23	0.16	0.43	-0.41	-0.23	0.63	bdl
Au	3.26	4.60	4.15	4.35	3.16	4.15	0.03	0.1
Pb	1 157	1 534	908	1 572	799	1 157	0.08	0.4
Bi	23.55	198.1	146.5	228.3	144.6	147	0.03	0.5
Mo	40.44	120.3	79.16	156.5	64.26	79.16	0.04	bdl
W	0.23	0.75	0.44	1.01	0.39	0.44	0.05	bdl
Co/Ni比值	43	14	15	18	15	15		4.0
δ³⁴S值	6.3	6.1	6.8	6.6	6.1	6.3		6.4~8.9

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Genesis of Colloidal Pyrite and Its Metallogenic Significance in Asiha Gold Deposit，East Kunlun

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