Controls on compositional variations of coeval magmatic sulfide deposits in the Xiaoguanhe region,the Permian Emeishan Large Igneous Province,SW China
The Xiaoguanhe region in SW China hosts numerous coeval magmatic sulfide deposits associated with small mafic-ultramafic intrusions that belong to the Permian Emeishan Large Igneous Province.These sulfide deposits show large compositional variations from PGE-rich to PGE-poor in the bulk sulfide.Integrated mineralogical,elemental and isotopic compositions reveal different magma evolution histories for the different magmatic sulfide deposits in the region.The ore-bearing systems in the region are parts of a larger magma pluming system in which the composition of magma changed with time and space from high-Mg (picritic) to more evolved (basaltic) liquids due to olivine fractional crystallization and crustal contamination.The compositions of original sulfide liquids were controlled by the timinng of sulfide saturation in the evolving magma as well as the volume of the magma involved.Most of the sulfide deposits in the region belong to the conduit-type deposits in which sulfide concentration was mainly controled by fluid dynamics in open systems instead of gravitational settling in closed systems.
Yan Tao Fei-Lin Zhu Yan-Sheng Ma Song-Yue Yu
State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Scienc East China mineral exploration and development bureau,Nanjing 210007
国际会议
贵阳
英文
160-163
2012-06-16（万方平台首次上网日期，不代表论文的发表时间）