GEOCHEMICAL CHARACTERISTICS OF GRANODIORITE PORPHYRY AND MINERALIZATION STUDY IN THE GAERQIN COPPER DEPOSIT, TIBET

HE Yangyang; WEN Chunqi; LIU Xianfan

doi:10.12090/j.issn.1006-6616.2018.24.03.036

Volume 24 Issue 3

Jun. 2018

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Article Navigation > Journal of Geomechanics > 2018 > 24(3): 341-349

HE Yangyang, WEN Chunqi, LIU Xianfan, 2018. GEOCHEMICAL CHARACTERISTICS OF GRANODIORITE PORPHYRY AND MINERALIZATION STUDY IN THE GAERQIN COPPER DEPOSIT, TIBET. Journal of Geomechanics, 24 (3): 341-349. DOI: 10.12090/j.issn.1006-6616.2018.24.03.036

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GEOCHEMICAL CHARACTERISTICS OF GRANODIORITE PORPHYRY AND MINERALIZATION STUDY IN THE GAERQIN COPPER DEPOSIT, TIBET

doi: 10.12090/j.issn.1006-6616.2018.24.03.036

HE Yangyang^{1, 2
,},
WEN Chunqi^{2
,
,},
LIU Xianfan²

1.
School of Geography and Resource Science, Neijiang Normal University, Neijiang 641112, Sichuan, China
2.
Geosciences College of Chengdu University of Technology, Chengdu 610059, Sichuan, China

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Received: 2017-07-09
Revised: 2018-05-20
Published: 2018-06-01

Abstract

Abstract

The rare earth elements (REEs) in granodiorite porphyry and zircon from the Gaerqin copper deposit of Tibet, China, were geochemically traced, and the mineralization was also studied. The total levels of REEs in granodiorite porphyry varied slightly (ΣREE=48.64×10^-6~78.12×10^-6) with LREE/HREE=8.67~11.68. All samples were featured by a right-leaning distribution with enrichment in light REEs (LREEs) and depletion in heavy REEs (HREEs), δEu changed from weak negative anomaly to weak positive anomaly, which is due to the gradual weakening of negative Eu anomalies caused by crystallization differentiation and a weak positive Eu anomaly in the process of the partially remelting growth of the angled magma in the crust. The zircon was found with typical oscillatory zones, large total REE levels (ΣREE=735.78×10^-6~6792.10×10^-6), LREE depletion, HREE enrichment, evident Ce positive anomaly and weak negative Eu anomaly. This is because under the action of mantle fluid, heavy rare earth elements and Ce are more likely to enter the lattice of zircon than other light rare-earth elements. The weak negative abnormality of Eu is caused by oxidation and leaching of the late diagenetic rock mass. Comprehensive analysis reveals that the mantle fluid action endowed the granodiorite porphyry with the characteristics of crust-mantle mixing or even ore-formation. Meanwhile, the matter-energy exchange between magma and surrounding rocks accounted for the metamorphic sandstone ore-formation.
- granodiorite porphyry,
- zircon,
- rare earth elements,
- Gaerqin,
- Tibet

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GEOCHEMICAL CHARACTERISTICS OF GRANODIORITE PORPHYRY AND MINERALIZATION STUDY IN THE GAERQIN COPPER DEPOSIT, TIBET

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GEOCHEMICAL CHARACTERISTICS OF GRANODIORITE PORPHYRY AND MINERALIZATION STUDY IN THE GAERQIN COPPER DEPOSIT, TIBET

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