Quantitative simulation for the formation of Baimazhai Ni-Cu sulfide deposit in Yunnan Province
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摘要:
岩浆的分离结晶作用和地壳同化混染作用是造成硫饱和的重要因素。本文以金平-Song Da地区二叠纪低钛苦橄岩为原生岩浆，使用MELTS程序模拟了岩浆在分离结晶和围岩同化混染作用的控制下达到硫饱和，发生硫化物熔体的熔离。模拟结果表明，低钛苦橄质岩浆从源区上升到浅部岩浆房的过程中发生了约10%的橄榄石的分离结晶，形成高镁的玄武质岩浆。高镁玄武质岩浆在浅部岩浆房内同化混染>18%的围岩，并经历约27%硅酸盐矿物的分离结晶后达到硫饱和。熔离的硫化物熔体在岩浆通道内聚集形成了白马寨铜镍硫化物矿。经历硫化物熔体熔离后的残余岩浆喷出地表形成了金平地区亏损Ni和Cu并具有强烈地壳混染特征的低钛玄武岩。
Abstract:Fractional crystallization and crustal contamination are important factors to trigger magma over S-saturation. In this study, we chose the Permian low-Ti picrite in Jinping-Song Da area as a primary magma to simulate fractional crystallization and crustal contamination which may trigger the magma over S-saturation to form Baimazhai Ni-Cu sulfide deposit based on MELTS program. The simulation shows that 10% olivine had crystallized from the low-Ti picritic magma and then the residue magma would become to high-Mg basaltic. In the upper crust chamber, the high-Mg basaltic magma had contaminated more than 18% wall rocks and 27% silicate minerals have crystallized, then the magma would reach S-saturation. The segregated sulfide was concentrated to middle of magma channel by flow differentiation, and consequently, formed Baimazhai concentric Ni-Cu sulfide deposit. The magma which underwent sulfide segregation erupted to form the Ni- and Cu-depleted low-Ti basalt with significant crustal contamination characters in Jinping-Song Da area.
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图 1
白马寨岩体在峨眉山大火成岩省中的位置(a)、白马寨地区镁铁-超镁铁侵入体分布(b)和白马寨侵入体345m深处的平面图(c)(据Wang et al., 2006)
Figure 1.
The tectonic location of the Baimazhai intrusion in Emeishan large igneous province (a), surface map showing the mafic-ultramafic intrusions in the Baimazhai area (b) and a planar of the Baimazhai intrusion at 345m depth (c) (after Wang et al., 2006)
图 3
岩浆中S含量和S饱和度的变化(a)和Ni、Cu含量以及分离结晶量的变化(b)
Figure 3.
Variations of the concentrations of S and SCSS (the S content at sulfide saturation) (a) and variations of the concentrations of Ni and Cu (b) in magma
图 4
硫化物中Ni和Cu含量与R值(硅酸盐熔体/硫化物熔体)的相关关系
Figure 4.
The relationship between the concentrations of Ni and Cu of sulfide and the R factor (silicate magma/sulfide liquid)
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