峨眉火成岩省内带岩浆硫化物含矿岩体橄榄石的成因意义

被引：12

作者：

官建祥 ^{[1
,2
]}

宋谢炎 ^{[1
]}

Leonid VDanyushevsky ^{[3
]}

陈列锰 ^{[1
,2
]}

聂晓勇 ^{[1
,2
]}

机构：

[1] 中国科学院地球化学研究所矿床地球化学国家重点实验室

[2] 中国科学院研究生院

[3] School of Earth Sciences and Centre for Ore Deposit Research,University of Tasmania

来源：

地球科学(中国地质大学学报) | 2010年 / 35卷 / 02期

关键词：

峨眉火成岩省内带; 岩浆硫化物矿床; 橄榄石; 分离结晶; 硫化物熔离; 晶间熔浆效应;

D O I：

暂无

中图分类号：

P588.125 [];

学科分类号：

070901 ;

摘要：

峨眉火成岩省内带出露数十个含Ni-Cu-铂族元素(PGE)硫化物矿床(或矿化)的镁铁质-超镁铁质侵入岩体.根据铂族元素(PGE)含量的不同,这些岩浆硫化物矿床可分为Ni-Cu型(如力马河和清水河)、Ni-Cu-PGE型(如清矿山和黄草坪)和PGE型(如金宝山和杨合武).不同类型含矿岩体的橄榄石电子探针分析表明,除了清矿山岩体少数几个橄榄石晶体属于镁橄榄石外(Fo90.1～Fo93.1),其余均为贵橄榄石(Fo76.8～Fo89.6).不同矿化类型的岩体的橄榄石成分差异明显.Ni-Cu型硫化物含矿岩体的橄榄石Fo为77～87,Ni含量变化范围为(976～2176)×10-6.Ni-Cu-PGE型硫化物含矿岩体的橄榄石Fo为80～86,Ni含量范围为(1024～2543)×10-6.PGE型硫化物含矿岩体的橄榄石Fo为78～84,Ni含量在(776～1755)×10-6之间变化.清矿山Ni-Cu-PGE型硫化物含矿岩体橄榄石具有高Fo(最高达93.1)和CaO含量(0.245%～1.14%)、以及非常低的Ni(266×10-6)的特征,可能是同化混染作用的结果.利用力马河岩体最高Fo含量的橄榄石成分计算表明,母岩浆是高镁苦橄玄武质岩浆.橄榄石分离结晶和硫化物熔离模拟显示:Ni-Cu型矿化侵入体母岩浆经历了最广泛的硫化物熔离(～0.1%),Ni-Cu-PGE型侵入体次之,大约为0.06%,而PGE型侵入体母岩浆硫化物熔离程度最低(～0.02%).早期结晶的橄榄石晶体与间隙硅酸盐熔浆之间再平衡过程是橄榄石成分变化的原因.

引用

页码：224 / 234

页数：11

共 32 条

[11]

康滇地区基性超基性岩[M]. 重庆出版社 , 刘朝基等著, 1988

[12]

Controls on the metal compositions of magmatic sulfide deposits in the Emeishan large igneous province, SW China[J] . Xie-Yan Song,Mei-Fu Zhou,Yan Tao,Jia-Fei Xiao.Chemical Geology . 2008 (1)

[13]

Two magma series and associated ore deposit types in the Permian Emeishan large igneous province, SW China[J] . Mei-Fu Zhou,Nicolas T. Arndt,John Malpas,Christina Yan Wang,Allen K. Kennedy.LITHOS . 2007 (3)

[14]

Postcumulus processes in oceanic-type olivine-rich cumulates: the role of trapped melt crystallization versus melt/rock interaction[J] . G. Borghini,E. Rampone.Contributions to Mineralogy and Petrology . 2007 (6)

[15]

Petrogenesis of the Pt–Pd mineralized Jinbaoshan ultramafic intrusion in the Permian Emeishan Large Igneous Province, SW China[J] . Yan Tao,Chusi Li,Ruizhong Hu,Edward M. Ripley,Andao Du,Hong Zhong.Contributions to Mineralogy and Petrology . 2007 (3)

[16]

Geochronology of layered mafic intrusions from the Pan–Xi area in the Emeishan large igneous province, SW China[J] . Hong Zhong,Wei-Guang Zhu.Mineralium Deposita . 2006 (6)

[17]

Genesis of the Permian Baimazhai magmatic Ni–Cu–（PGE） sulfide deposit, Yunnan, SW China[J] . Christina Yan Wang,Mei-Fu Zhou.Mineralium Deposita . 2006 (8)

[18]

Geochemical constraints on the origin of the Permian Baimazhai mafic–ultramafic intrusion, SW China[J] . Christina Yan Wang,Mei-Fu Zhou,Reid R. Keays.Contributions to Mineralogy and Petrology . 2006 (3)

[19]

Sedimentary evidence for a rapid, kilometer-scale crustal doming prior to the eruption of the Emeishan flood basalts[J] . Bin He,Yi-Gang Xu,Sun-Ling Chung,Long Xiao,Yamei Wang.Earth and Planetary Science Letters . 2003 (3)

[20]

Trace-element and Sr–Nd isotopic geochemistry of the PGE-bearing Xinjie layered intrusion in SW China[J] . Hong Zhong,Yong Yao,Stephen A. Prevec,Allan H. Wilson,Morris J. Viljoen,Richard P. Viljoen,Bing-Guang Liu,Yao-Nan Luo.Chemical Geology . 2003 (3)

← 1 2 3 4 →