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东昆仑中带印支期浅成-超浅成岩浆岩及其构造环境 被引量:16

PETROLOGY AND TECTONIC ENVIRONMENT OF INDOSINIAN HYPABYSSAL ROCK IN THE MIDDLE BELT OF EAST KULUN MOUNT AINS
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摘要 东昆仑中带印支期浅成 -超浅成岩浆岩由闪长玢岩、角闪安山岩、细粒闪长岩和隐爆角砾岩组成。岩石学特征及岩石地球化学研究 ,该类岩石属于浅成 -超浅成的高钾钙碱性系列 ,是印支期古特提斯洋壳向北部柴达木陆块俯冲—碰撞构造环境下 ,活动陆缘火山弧区岩浆活动的产物。 Indosinian hypabyssal rocks in East Kulun mountains' middle belt consist of diritic porphyrite, andesitic porphyrite, porphyrite and cryptoexplos ive breccia. According to the study on the petrology and geochemical characteris tics, the rocks belong to HK-cale alkaline volcanic suite. In the north pal eo-Tethys, they were formed under the active continental margin or volcanic arc environment. During the Indosinian period, the subduction of oceanic crust and closure of Paleo-Tethys cause extensive volcanism and magmatism.
出处 《矿物岩石》 CAS CSCD 北大核心 2000年第2期14-18,共5页 Mineralogy and Petrology
基金 地矿部九.五资源与环境科技攻关项目!( 95- 0 2- 0 0 5 )
关键词 浅成-超浅成岩 构造环境 印支期 东昆仑中带 hypabyssal rock tectonic environment Indosinian period middle belt of east Ku nlun Mountains
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