甘肃金川Ⅱ号岩体岩相学特征及分离结晶过程探讨
Petrographic features of segment II of the Jinchuan intrusion, Gansu, and itsfractional crystallization
查看参考文献38篇
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文摘
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金川II号岩体主要由二辉橄榄岩和硫化物橄榄岩构成,中细粒含辉橄榄岩呈“上悬体”产于岩体顶部,与中粒二辉橄榄岩呈短程渐变关系,反映出岩浆或“晶粥”多期贯入的特点.在各岩相矿物之间的岩相学关系的研究基础上,结合热力学相图分析,本文认为金川II号岩体造岩矿物的结晶顺序为: 尖晶石、橄榄石、斜方辉石、单斜辉石和斜长石.同时,橄榄石结晶后与母岩浆发生反应,使橄榄石颗粒变为浑圆状.此外,矿体硫化物橄榄岩、硫化物含辉橄榄岩中堆积矿物橄榄石粒度明显小于硫化物二辉橄榄岩中橄榄石粒度,暗示在“晶粥”侵入浅部岩浆房之前,深部岩浆房底部已聚集了大量的硫化物矿浆. |
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其他语种文摘
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Segment II of the Jinchuan intrusion is composed mainly of lherzolite and sulfide peridotite. Fine- and medium-grained harzburgite occurs as a "roof pendant" at the top of the intrusion and shows a short-distance gradational relationship with the medium-grained lherzolite, reflecting the feature of multiple injections of magma or "crystal mush". Based on the petrographic relationships between the minerals of various rock facies, combined an analysis of the thermodynamics phase diagrams, the authors think that the crystallization sequence of the rock-forming minerals in Segment II is spinel, olivine, orthopyroxene, clinoyroxene and plagioclase. Reaction between olivine and parent magma caused olivine crystals to become rounded. In addition, the grain size of cumulus olivine in the sulfide peridotite and sulfide harzburgite is obviously smaller than that of olivine in the sulfide lherzolite, implying that abundant sulfide ore pulp had gathered at the bottom of the deep magma chamber before the "crystal mush" was intruded into the shallow magma chamber. |
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来源
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岩石学报
,2007,23(10):2553-2560 【核心库】
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关键词
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金川铜镍硫化物矿床
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II号岩体
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岩相学特征
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相图
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分离结晶
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地址
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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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1000-0569 |
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学科
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地质学 |
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基金
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国家自然科学基金
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:3144880
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