杨子地台北缘裂谷系构造初析

PRELIMINARY ANALYSIS OF THE STRUCTURES IN THE RIFT SYSTEM AT THE NORTHERN MARGIN OF THE YANGTZE PLATFORM

摘要: 本文所称杨子地台北缘,系泛指阳平关—大巴山断裂以北,留坝、柞水、山阳、浙川断裂带以南,陕、豫、鄂、川西省接壤的广大地区（图1）。其构造部位包括习惯上所称的南秦印支褶皱带、北大巴山加里东褶皱带和两郧突起三个二级构造单元。本文作者从1976年和1982年曾先、后两次到上述地区范围内作专题性地质调查。根据作者所观察到的地质现象,结合前人资料的阅读,从岩石建造组合、岩浆活动表现和岩石化学特征,分析本地

Abstract: According to sedimentary rock associations, magmatic activity and petrochemical characteristics coupled with the history of the crustal evolution and structural deformation, the paper discusses the tectonic assignment of the vast region north of the Yangping Pass-Dabashan fracture zone and south of Liuba-Shanyin-Yhechuan fracture zone. It is suggested that tectonically this region should belong to the early Sinian-terminal Silurian rift belt at the northern margin of the Yangtze platform.