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| 1 | 四川攀枝花新元古代苦橄质岩脉的铂族元素地球化学特征显示文摘四川攀枝花地区出露有新元古代苦橄质岩脉。本文研究表明这些苦橄质岩脉的铂族元素(PGE)含量较高(19.7~29.0 ng/g),原始地幔标准化后的PGE分布模式呈Pt-Pd富集型,Pd/Ir值(5.64~11.33)与高镁玄武岩和科马提岩相似。同时,这些岩石显示在形成过程中没有经历硫化物和PGE合金矿物的熔离,其原始岩浆起源于地幔较高程度的部分熔融,可能与地幔柱的影响有关。通过扣除铬尖晶石和橄榄石结晶分异对PGE造成的影响,得到原始岩浆的PGE组成特征为Ir、Ru、Rh相对于Pt、Pd明显亏损,在源区已无硫化物存在的条件下,这很可能是由于地幔部分熔融过程中有IPGE合金矿物残留在地幔源区。攀枝花地区苦橄质岩脉可能与该地区冷水箐Cu-Ni硫化物矿床具有相似的原始岩浆组成。 | 杨仪锦 柏中杰 朱维光 钟宏 范宏鹏 | 2016 | 矿物岩石地球化学通报2016，35，1： | 2 |
| 2 | Enrichment of Platinum-group Elements(PGE) and Re-Os Isotopic Tracing for Porphyry Copper(Gold) Deposits显示文摘Platinum-group elements(PGE) in PGE-rich porphyry copper(gold) deposits are mainly Pt and Pd,whereas the concentrations of other PGE(Ru,Rh,Os,Ir) are significantly low.Moreover,Pt and Pd mainly exist in sulfides in the forms of crystal lattice or tiny platinum-group mineral(PGM) inclusions.The present data show that there is a positive relationship between Pt and Pd concentrations and Cu(Au) in porphyry copper(gold) deposits.The comparison of chondritenormalized PGE distribution patterns between the ore-bearing porphyry intrusions and ore-barren porphyry intrusions in arc setting,187Os/188 Os,87Sr/86 Sr and S isotopes for porphyry copper(gold) deposits shows that PGEs were mainly derived from the mantle,and fluids from subduction zones devoted trivial PGE to the magma.The porphyry copper(gold) deposits associated with subducted events are most probably enriched in PGE,whereas those related to crustal thickening,lithospheric delamination or underplating rarely concentrate PGE.The osmium isotopic compositions in porphyry copper(gold) deposits reveal that(187Os/188Os)i values are highly variable and not lower than those of primitive upper mantle(PUM) and mantle peridotite,however,osmium concentrations are commonly lower than mantle peridotite,suggesting that parental magmas of some porphyry intrusions had experienced crustal contamination during magma evolution.Experimental investigations have proved that PGE exist in the forms of Cl- and HS- complexes during transportation and migration of the oreforming fluids.This paper summarizes previous studies including crucial controlling factors and mechanisms for PGE enrichment,and points out that the mantle-derived magmas parental to porphyry intrusions are the prerequisite for PGE enrichment in porphyry copper(gold) deposits.Favorable physical and chemical conditions(including salinity,temperature,pressure,pH,and oxygen fugacity) in hydrothermal fluids crucially control the PGE enrichment,and sulfur concentrations of melts play important roles in this process as well. | HE Xiaohu ZHONG Hong ZHU Weiguang BAI Zhongjie HU Wenjun | 2014 | Acta Geologica Sinica(English Edition)2014，88，4： | 2 |
| 3 | 桂西马雄辉绿岩的Sr-Nd-Hf同位素和铂族元素特征:对岩浆演化和硫化物成矿作用的启示显示文摘桂西地区基性岩与峨眉山大火成岩省(ELIP)有高度的时空耦合性,对于理解ELIP时空分布、岩石成因及岩浆硫化物演化与成矿具有重要的意义。本文通过对桂西地区马雄辉绿岩年代学、铂族元素(PGE)及Sr-Nd-Hf同位素研究来揭示其岩浆起源和演化以及岩浆硫化物的成矿作用。LA-ICP-MS锆石U-Pb定年结果显示,马雄辉绿岩的锆石^(206)Pb/^(238)U加权平均年龄为257.1±1.3Ma(MSWD=0.108),形成于晚二叠世;马雄辉绿岩具有与ELIP高Ti玄武岩相似的主微量元素和Sr-Nd-Hf同位素特征以及比ELIP高Ti玄武岩较高的Ti/Y比值,并且形成于熔融深度更深(~3.5GPa)和部分熔融程度较低(<8%)的熔融环境,是峨眉山地幔柱外带岩浆作用的产物;马雄辉绿岩Cu/Pd比值高而稳定,呈现亏损Ir亚组(IPGE)富集Pd亚组(PPGE)的左倾型PGE配分特征,IPGE含量和ELIP高Ti玄武岩相近,而PPGE含量比ELIP高Ti玄武岩亏损,表明其岩浆在上升侵位中未发生明显的饱和硫化物熔离,PGE的分异主要受S不饱和条件下的橄榄石和铬铁矿结晶分异控制,不利于Cu-Ni-PGE硫化物成矿。 | 赵兵 刘希军 李政林 时毓 招传 覃显著 | 2022 | 岩石学报2022，38，9： | 1 |
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