浙西北二叠、三叠纪浊积岩系及其大地构造意义

PERMIAN AND TRIASSIC TURBIDITE AND ITS TECTONIC SIGNIFICANCE IN THE NORTHWESTERN ZHEJIANG

对浙西北上二叠统长兴组、大隆组及下三叠统政棠组沉积特征、生物生态等的研究表明,长兴组、大隆组和政棠组为一套浊积岩系沉积,沉积背景为一向东南倾斜的被动大陆边缘,印支期造山作用使其发生了强烈的前陆褶皱-冲断变形,岩石地球化学分析结果表明在浊积岩沉积时期,推测可能存在部分来源于晚元古代岛弧和晚元古代造山带的物源。

Based on the sedimentary and bioecological characteristics, the Upper Permian Changxing and Dalong Formations and the Lower Triassic Zhengtang Formation in northwestern Zhejiang are recognized as deep-water turbidites. They were violently deformed by the Indosinian orogenic movement and show the characteristics of a foreland fold-thrust belt. Their sedimentary setting is passive continental margins tilting northeast. The geochemical data of rocks show that there may be some materials from the Late Palaeozoic arc and Late Proterozoic orogenic belt during the deposition of the turbidite.