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红安群变质地层中几种地质体的成因浅析

GENETIC ANALYSIS OF SOME GEOLOGIC BODIES IN HONGAN GROUP METAMORPHIC STRATA
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摘要 本文对红安群变质地层中常见的三种地质体的成因,作出了分析解释。它们是:围岩片理平行于变基性岩体与围岩的接触面分布;绿帘石英岩脉和赋存于榴辉岩体中的金红石矿。笔者认为这些地质体的形成与退变质作用、构造作用、变质分异作用等地质作用有关。 Meta-basic rocks with country rocks of Hongan group in North Eastern region of Hubei Province has undergown the tectonic compression during the subducting and uplifting of plates; But, at the period of retrogressive metamorphism, the compressed rock bodies in-creased in volume and formed″expansion process″. So that, the schistosity of country rock distributed parallel the margin of meta-basic rock bodies due to two reasons which above mentioned. At the same time, Rutile bearing in the eclogites concentrated in the hornblendites and Titanium released by mafic minerals formed coarse grain Rutiles due to retrogressive meta-morphism. Therefore, looking for the Rutile deposits should attach great importance to the hornblendites that located at margin area of eclogite bodies and has undergown high grade retrogressive metamorphism. Epidote-quarze veins that often observed in Hongan group metamorphic rocks were formed by metamorphic differentiation which made dispersed fine grains of epidote and quarze accumulated in the structural fissures.
出处 《湖北地质》 1993年第1期45-49,109,共6页
关键词 红安群 变基性岩 构造运动 退变质作用 变质分异作用 金红石 Hongan group Retrogressive metamorphism Tectonic eompression Rutile
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