赣西北幕阜山—九岭山一带前震旦纪构造变形

赣西北幕阜山—九岭山一带前震旦纪构造变形

章泽军, 张雄华, 易顺华

中国地质大学，武汉 430074

收稿日期:2003-03-20 修回日期:2003-03-20 出版日期:2003-03-20 发布日期:2003-03-20

Intraplate Tectonic Deformation of the Precambrian in the Mufu and Jiuling Mountains Area，North-West Jiangxi

ZHANG Ze-jun, ZHANG Xiong-hua, YI Shun-hua

China University of Geosciences, Wuhan 430074

Received:2003-03-20 Revised:2003-03-20 Online:2003-03-20 Published:2003-03-20

摘要/Abstract

摘要： 赣西北幕阜山－九岭山一带中元古界双桥山群是一套被震旦系不整合覆盖、成层有序的正常沉积地层。其内近东西向褶皱（同构造期热液事件）叠加早期近南北向褶皱为华夏板块与扬子板块碰撞拼贴过程中在板内留下的痕迹，板内构造与拼贴带为同期构造运动形成的不可分割的统一体。根据侵位于东西向褶皱核部的漫江单元、山口单元（斜长花岗岩）单颗粒锆石直接蒸发年龄（分别为846±7Ma与805±75Ma)，以及与东西向褶皱伴生的古断裂特征等证据表明：该区构造变形至少发生在800Ma之前的前震旦纪，可能与格林威尔运动相当，由此证明江南古陆是客观存在的。

Abstract: The middle Proterozoic Shuangqiaoshan Group in area of Mufu and Jiuling Mountains，Northwest Jiangxi is a set of normal sedimentary strata with obvious sequence and is covered by the Sinan with an unconformity．The nearly N folds formed early were modified by the nearly E W folds and synchronous tectonic heat fluid event which is the intraplate trace of the collision between the Yangtze and Cathaysia plates ． The intraplate tectonics and amalgamation belt occurred in a synchronous tectonic movement．K-Ar dating of single mineral of diorites from the Manjiang and the Shanko units which intruded into the E—W folds give ages of 846±7 Ma and 805±75 M a respectively． The palaeo-faults are the companions of the E-W folds． These evidences suggest that the tectonic deformation occurred in the Precambrian before 800 Ma corresponding approximately to the Grenville movement and the existence of the Jiangnan Ancient Land．

章泽军, 张雄华, 易顺华. 赣西北幕阜山—九岭山一带前震旦纪构造变形[J]. J4.

ZHANG Ze-jun, ZHANG Xiong-hua, YI Shun-hua. Intraplate Tectonic Deformation of the Precambrian in the Mufu and Jiuling Mountains Area，North-West Jiangxi [J]. J4.