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地质论评  2004 

勉县--略阳带大地构造属性之探讨

Keywords: 勉略带,南北两侧,泥盆纪--石炭纪沉积,分割性大洋盆地,缝合带,构造混杂带

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Abstract:

本文从剖析勉略带南北两侧泥盆纪-石炭纪沉积入手,指出南北两侧同属于华南古生物地理区,在沉积相、沉积建造和沉积充填序列方面基本相同,都是以浅海相碳酸盐岩-碎屑岩沉积建造和海进型充填序列为特征.其次,对所谓的"勉略蛇绿岩带"提出质疑;岩石组合和时代配置都不支持该蛇绿岩带作为分割性大洋盆地的残余,何况它有限的空间展布同样不支持上述观点.第三,将勉略带同典型的缝合带进行比较,认为勉略带缺乏典型缝合带内部及其两侧地质体的空间配置关系,诸如沟弧盆体系,俯冲杂岩及前陆盆地等.况且,根据相关的地球化学及地球物理资料,勉略带在泥盆纪-三叠纪期间不存在分割性大洋盆地,在印支运动中也没有形成缝合带.因此,提出勉略带在泥盆纪-石炭纪曾经是一个裂谷,印支运动以来历经多期构造作用形成一条构造混杂带,在陆内造山过程中可能发生过大规模的大陆地壳消减.

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