东秦岭造山带钠长岩的特征,成因及时代
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Characteristics andGenesis of the Albitite in the East Qinling Orogenic Belt
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    摘要:

    经1/5万区调填图,作者在东秦岭造山带夹持于竹林关-青山断裂带和山阳-豆腐尖断裂带之间的原划“九里坪组”地层中解体出了一系列规模不大的钠长岩体。通过野外宏观调查和室内测试分析,对这些钠长岩的产状、地质背景、岩石化学和地球化学特征进行了综合研究。提出了这些钠长岩是由深部钠质熔浆沿断裂带上侵到地壳浅部发生侵入-交代作用而形成的观点。其成因模式为:侵入-隐爆-充填交代。这与前人在研究西秦岭造山带钠长岩时所提出的热水沉积摸式明显不同。另外,还从这些钠长岩体中首次获得全岩铷-锶等时线年龄为364。9=-10。9Ma的资料。对研究整个秦岭造山带钠质流体热事件具有十分重要的意义。

    Abstract:

    The albitite dispdrsed over the Qinshan-Zhulinguan area consists of a series of small intrusive and metasomatic bodies disintegrated from the “Jiuliping Formation” which is sandwiched between Zhuling-Qinshan fault and Shanyang –Doufujian fault in the East Qinling orogenic belt. Comprehensive studies show that the albitite was formed by intrusive-metasomatic activity of alkali fluids (a kind of special magma or solution).Rocks of the albitite can be mainly divied into three types ,viz.,lumpy albitite,breccia of albitite and brecciated albitite.Among them ,the first type was formed by intrusion and the last two types were formed by cryptoexplosion and filling-metasomatism..Both the lumpy albitite and the brecciated albitite have the same Rb –Sr isochron age of 364.9±10.9 Ma, indicating that the activity of the alkali fluids occurred in Devonian.

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李 勇,苏春乾,刘继庆,1999,东秦岭造山带钠长岩的特征,成因及时代[J].岩石矿物学杂志,18(2):121~127. Li Yong,1999,Characteristics andGenesis of the Albitite in the East Qinling Orogenic Belt[J]. Acta Petrologica et Mineralogica,18(2):121~127.

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  • 最后修改日期:1998-05-18
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