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桐柏—大别造山带剪切带阵列的构造岩研究 预览 被引量:14

TECTONITES IN THE SHEAR ZONE ARRAY OF THE TONGBAI-DABIE OROGENIC BELT
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摘要 桐柏-大别造山带剪切带阵列经受长期的应变软化、应变局部化和变形分解作用,形成了一系列构造岩,包括糜棱岩、变晶糜棱岩、半塑性糜棱岩和面理化碎裂岩等。糜棱岩普遍具二相糜棱结构或由相连的弱相基质或层分离强相残斑或布丁所形成的IWL结构。构造岩中显微构造各式各样,并具一定的组合形式和演化规律,反映了不同环境下主导变形机制的多样性及变形机制间转换的规律性。代表性剪切带岩化学成分变异的研究表明,除流体流动外, A series of tectonites were formed in the shear zone array of the Tongbai-Dabie Orogenic Belt, including mylonites, blastomylonites, semi-plastic mylonites and foliated cataclasites as a result of multiple strain localization, strain softening and deformation partitioning. The mylonitic rocks are characterized by a two-phase mylonitic structure, or an inteconnected weak matrix or layer (IWL) structure formed by separating clasts or boudins of the stronger phase by interconnected weaker phase matrix or layers. Various kinds of microstructures are found in the tectonites. The assemblage and evolutionary trend of the microstructures are controlled by the variation, alternation and transition of the dominant deformation mechanisms in different environments. The variation in chemical composition of the rocks from a typical shear zone is presented. The enrichment of immobile elements, such as Ti, P, Zr, V and Y, in the mylonites and ul-trumylonites is inteprected as being due to volume losses of the tectonites. The volume losses are estimated by mass balance calculations, based on the variation of elements chemistry. The calculation also indicates the loss of large amounts of SiO2 and infiltrated fluids. The large volume losses and fluid flow play a very important role for the chemical and rheological behaviours of the rocks in the shear zoes.
作者 钟增球 索书田 Zhong Zengqiu, Suo Shutian and Xu Qidong(China University of Geosciences, Wuhan, Hubei)
机构地区 中国地质大学
出处 《地质学报》 CAS CSCD 北大核心 1996年第4期 315-323,T001,共10页 Acta Geologica Sinica
基金 国家自然科学基金(编号 49172090) 地质矿产部定向基金(编号91-26)
关键词 造山带 构造岩 糜棱结构 成分变异 桐柏地区 Tongbai-Dabie Orogenic Belt, tectonite, two-phase mylonitic structure, com- position variation, volume loss
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参考文献4

  • 1钟增球,地球科学,1994年,19卷,4期,433页 被引量:1
  • 2钟增球,地学前缘,1994年,1卷,1/2期,162页 被引量:1
  • 3索书田,大别山前寒武纪变质地体岩石学与构造学,1993年 被引量:1
  • 4钟增球,构造岩与显微构造,1991年 被引量:1

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