新疆东准噶尔地区荒草坡地体研究

The Study of Eastern Junggar Huangcaopo Terrane in Xinjiang

麦钦乌拉山南坡出露的荒草坡群，曾被认为是东准噶尔晚古生代岛弧褶皱带的基底．本文研究表明，该套地层的诸方面特征与阿尔泰地区的奥陶系和志留系地层可以对比，实际上，荒草坡群是东准噶尔晚古生代构造带中的早古生代地体，是从西伯利亚活动陆缘裂解出来的大陆碎决．

Huangcaopo group is the oldest strata in the Eastern Junggar orogenic belt.Huancaopo terrane consists of Huangcaopo group although it was considered to be late paleozoic fold basement in the Eastern Junggar region.The fault contact seperates the terrane from adjacent late paleozoic strata.The study of metamorphic characteristics,rock mineral assemblages,fossil characteristics and structural deformation style for the terrane suggests the terrane differs in many aspects from its adjacent late paleozoic strata,but,is more similar to the ordovian silurian strata in Artai region in the southern margin of Siberian craton.These findings imply that the Huangcaopo terrane is a fragment of continental crust derrived from the Siberian craton.