| 北秦岭柞水——太白区段两类激动陆缘型幔源岩浆活动与岩浆过程 |
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| 引用本文： | 姜常义,苏生瑞,任名华,杨志华.北秦岭柞水——太白区段两类激动陆缘型幔源岩浆活动与岩浆过程[J].岩石矿物学杂志,1997,16(4):314-323. |
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| 作者姓名： | 姜常义 苏生瑞 任名华 杨志华 |
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| 基金项目： | 北京中关村地区联合分析测试中心和地矿部秦巴项目}5-01-010)联合资助。 |
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| 摘 要： | 研究区内有两类密切共生的活动陆缘型幔源侵入岩组合，它们分属拉斑系列和钙碱系列。这两个系列的侵入岩存在系统的化学差异，而且在高位岩浆房中普遍经历了镁铁矿物的分离结晶作用。
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| 关 键 词： | 拉斑系列 钙碱系列 活动陆缘 幔源 岩浆活动 |
Two Types of Active Epicontinental Mantle-derived Magmatic Activities and Magmatic Processes in the Zhashui-Taibai Sector of North Qinling Mountains |
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| Abstract: | In the study area there exist two types of closely associated active epicontinental mantle-derived imrusive assemblages belonging to tholeiite series and calc - alkaline series respectively. Intrusive rocks of the two series show systematic chemical differences and generally experienced fractional crystallization of mafic minerals at the high magmatic chamber. Both the
tholeiite series and the calc-alkaline series exhibit geochemical characteristics of mantle-derived magma along the margin of plate convergence, and are in different degrees enriched in large-ion lithophile elements and impoverished in high field strong elements, transitional elemenu and heavy rare earth elements. Geochemical studies show that magma of these two series originated from the same impoverished mantle source, with the source rock being spinet peridotite. The enrichmem of large-ion lithophile elements should be attributed to the devatering
or melting of the subducting plate. The chemical differences between these two series resulted from the higher melting degree of the tholeiite series than that of the calc-alkaline series. They were both formed during the closing process of the Qinling paleooceanic basin in Dinning period. |
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| Keywords: | North Qinling Moumains tholeiite series calc-alkaline series active continent margin Jinning orogeny |
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