首页|Mineral Geochemistry of Apatite in the Jiama Porphyry-Skarn Deposit,Tibet and its Geological Significance

Mineral Geochemistry of Apatite in the Jiama Porphyry-Skarn Deposit,Tibet and its Geological Significance

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The Jiama deposit,a significant porphyry-skarn-type copper polymetallic deposit located within the Gangdese metallogenic belt in Tibet,China,exemplifies a typical porphyry metallogenic system.However,the mineral chemistry of its accessory minerals remains under-examined,posing challenges for resource assessment and ore prospecting.Utilizing electron microprobe analysis and LA-ICP-MS analysis,this study investigated the geochemical characteristics of apatite in ore-bearing granite and monzogranite porphyries,as well as granodiorite,quartz diorite,and dark diorite porphyries in the deposit.It also delved into the diagenetic and metallogenic information from these geochemical signatures.Key findings include:(1)The SiO2 content,rare earth element(REE)contents,and REE partition coefficients of apatite indicate that the dark diorite porphyry possibly does not share a cogenetic magma source with the other four types of porphyries;(2)the volatile F and Cl contents in apatite,along with their ratio,indicate the Jiama deposit,formed in a collisional setting,demonstrates lower Cl/F ratios in apatite than the same type of deposits formed in a subduction environment;(3)compared to non-ore-bearing rock bodies in other deposits formed in a collisional setting,apatite in the Jiama deposit exhibits lower Ce and Ga contents.This might indicate that rock bodies in the Jiama deposit have higher oxygen fugacity.Nevertheless,the marginal variation in oxygen fugacity between ore-bearing and non-ore-bearing rock bodies within the deposit suggests oxygen fugacity may not serve as the decisive factor in the ore-hosting potential of rock bodies in the Jiama deposit.

apatitemetallogenesismineral geochemistryporphyryJiamaTibet

YANG Yang、TANG Juxing、ZHANG Zebin、TANG Pan、XIE Fuwei、RAN Fengqin、YANG Zongyao、YANG Huaichao、BAI Yun、SUN Miao、QI Jing

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School of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China

MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,CAGS,Beijing 100037,China

School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China

The Key Laboratory of the Ministry of Education on Solid Waste Treatment and Recycling,School of Environment and Resource,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China

Chengdu Surveying Geotechnical Research Institute Co.,Ltd.of MCC,Chengdu 610023,China

Sichuan Tianfu Mining Investment Co.,Ltd.,Chengdu 610055,China

Sichuan Institute of Comprehensive Geological Survey,Chengdu 610081,China

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National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinageological survey project

2022YFC29050014227209342230813DD20230054

2024

10.1111/1755-6724.15143

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(2)
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