印支运动Ⅰ幕(金子运动)在沿江地区成矿作用期存在与否及表现形式再讨论

Existence of the Indosinian Movement I(Golden Movement)during the mineralization period along the Yangtze River and its existence

印支运动Ⅰ幕(金子运动)作为中三叠世早期的尚未被绝大多数人认可的构造活动,其存在与否一直争议较大。本文通过对安徽沿江地区野外实地观察,发现以中三叠世周冲村组及以下地层为核的褶皱与以中三叠世黄马青组及上覆地层为核的褶皱不论从构造形态还是内部应力场方向均存在差异。同时结合前人对周冲村组砾岩段成因研究,认为印支运动Ⅰ幕(金子运动)存在,其活动界面位于周冲村组砾岩段内部,且该期构造活动总体表现为以盖层抬升为主,内部形成以大型宽缓褶皱为代表的构造变形,与此同时局部还伴有轻微的、造成地层缺失和角度不整合的褶皱变形。

The Indosinian Movement I(Golden Movement),as a tectonic activity in the early Middle Triassic that has not yet been recognized by most people,has been controversial.Based on field observations along the Yangtze River in Anhui,this paper found that the folds with the core of the Middle Triassic Zhouchongcun Formation and below and the folds with the core of the Middle Triassic Huangmaqing Formation and the overlying stratum,both in terms of structural form and There are differences in the directions of the internal stress fields.At the same time,combining the previous studies on the genesis of the conglomerate section of the Zhouchongcun Formation,it is believed that the Indosinian Movement I(golden movement)exists and its active interface is located inside the conglomerate section of the Zhouchongcun Formation.The layers are mainly lifted,and structural deformations represented by large and wide folds are formed in the interior.At the same time,there are also slight fold deformations that cause stratum loss and inconsistent angles.