摘要
本文从基本特征出发，结合岩石学特征，尤其是化学成分及同位素组成等特征，对中扬子地区下三叠统大冶组瘤状灰岩的成因进行了探讨．研究表明，在深水盆地和台缘斜坡下部的沉积环境中，由于周期性的瞬时动荡水体的作用，导致沉积物来源的差异性，再经过成岩作用期的差异压溶作用，形成了本区下三叠统大冶组瘤状灰岩。
The origin of the nodular limestone of Daye Formation of Lower Triassic in the Middle Yangtze region is studied on the basis of their petrologic characterishcs,chemical and isotopic compositions. It is suggested that the nodular limestone was mainly formed through differential compaction during diagenesis. This process took place in the sedimentary environment of a deep basin and in the lower parts of marginal slope of platform, as a result of instantaneous vibration of water that gave rise to differentiation of sediments.
出处
《地球化学》
CAS
CSCD
北大核心
1998年第3期276-282,共7页
Geochimica
关键词
化学成分
同位素
瘤状灰岩
中扬子地区
岩石成因
chemical composition, isotope, nodular limestone, Triassic, Middle Yangtze region
