黔西南碱性超基性脉岩的铂族元素地球化学
PGE Geochemistry of Alkaline Ultramafic Dykes in Southwestern Guizhou Province, China
查看参考文献55篇
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文摘
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黔西南出露大范围的碱性超基性脉岩, 其成因研究对了解该地区大规模的金矿形成具有重要意义. 采用卡洛斯管同位素稀释法结合ICP-MS分析了黔西南4个岩区碱性超基性脉岩中的Ni、Ir、Ru、Rh、Pt、Pd和Cu的含量. 结果显示:研究区脉岩铂族元素(PGE)的含量普遍较低, 原始地幔标准化PGE分布模式呈正斜率型;并具有较高的Cu/Pd比值(11903~60210). 综合对比研究表明, 研究区脉岩为地幔低程度部分熔融作用的产物, 原始岩浆具有硫不饱和的特征, 岩浆在上升过程中没有发生明显的硫化物分异, 但发生了一定程度的岩浆分离结晶. 此外, 陇要脉岩可能经历了岩浆上升时铬铁矿的分离结晶作用. |
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其他语种文摘
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Studies on the petrogenesis of alkaline ultramafic dykes are helpful to understand the formation of the gold deposits widely distributed in southwestern Guizhou Province, China. The platinum-group elements (PGE) are sensitive indicators of the petrogenesis (e. g., partial melting and silicate fractionation) of mafic-ultramafic rocks. Thus, in this paper, contents of Ni, Cu and PGE (Ir, Ru, Rh, Pt and Pd) were measured by using isotope dilution (ID)-ICP-MS with an improved Carius tube. The studied samples are characterized by low PGE contents, high Cu/Pd (11903-60210) ratios and positive slope in the primitive mantle normalized patterns. Synthetic and comparative studies on the PGE indicate that the ultramafic rocks were derived from low-degree partial melting of the MORB-like mantle. These dyke rocks were formed by the crystallization of the S-unsaturated magma which had not experienced obvious sulfide segregation. The primary magma of the ultramafic rocks, however, underwent extensive fractionation of clinopyroxene, olivine, Ti-bearing phases (e. g., rutile, ilmenite, titanite) and apatite, prior to emplacement. In addition, the Longyao ultramafic dykes experienced differentiation of chromite during primary magma ascent. |
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来源
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矿物学报
,2010,30(2):207-214 【核心库】
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关键词
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PGE
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超基性脉岩
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成因
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黔西南
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地址
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1.
中国科学院研究生院, 矿床地球化学国家重点实验室, 北京, 100039
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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, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家973计划
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国家自然科学基金项目
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西北大学大陆动力学国家重点实验室基金
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文献收藏号
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CSCD:3914306
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