Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 95-105.doi: 10.13278/j.cnki.jjuese.201501108

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Geochemical Characteristics and Significance of Pyroxene from Major Metallogenetic Intrusions in Hongqiling, Jilin Province, China

Hao Libo, Tian Mi, Zhao Yuyan, Lu Jilong, Sun Liji, Zhao Xinyun   

  1. College of GeoExploration Sciences and Technology, Jilin University, Changchun 130026, China
  • Received:2014-07-07 Published:2015-01-26

Abstract:

The Hongqiling Cu-Ni sulfide deposit is a magmatic deposit that ranks second in China. In order to investigate the source of magma and temperature & pressure conditions of crystallization, the chemical composition of the pyroxene in metallogenetic intrusions of Hongqiling was studied by rock slice identification and electron probe analysis. The results show that all clinopyroxene minerals are augite, and orthopyroxenes are all bronzite. The chemical compositions of the pyroxene change widely and the pyroxene is charactered by enrichment in Mg and depleting of Fe, with low content of TiO2, Al2O3 and Na2O. The Di-endmember of the clinopyroxene changes widely with the evolution from Mg-enrichment to Ca-enrichment, which shows a different variation tendency with the clinopyroxene from other typical mafic-ultramafic intrusions in the world. The source of magma was mantle-derived basalt magma, with high degree of differentiation. According to pyroxene thermobarometer, the crystallization temperature of the pyroxene in major metallogenetic intrusions of Hongqiling is estimated to 1 100-1 250℃ and the rock-forming depth is around 12.3-20.7 km.

Key words: pyroxene, geochemistry, temperature and pressure conditions of crystallization, Hongqiling, Cu-Ni sulfide deposit

CLC Number: 

  • P618.3

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