新疆东天山地区“大草滩运动”的建立与其地质意义

Establishment of "Big marsh movement"and its geological significance in east Tianshan mountain of Xinjiang

通过对东天山中泥盆统头苏泉组与下泥盆统大南湖组之间不整合的研究 ,确认下泥盆统大南湖组为海相岛弧沉积 ,中泥盆统头苏泉组为陆相沉积 ,二者之间的不整合代表一次造陆运动 ,因而建立了“大草滩运动”。“大草滩运动”造成地壳抬升 ,使北天山洋闭合 ,结束了北天山洋的演化历史。

Through the research of unconformity between Tousuquan formation in middle Devonian Period and Dananhu formation in early Devonian Period,We think that the sedimentary environment of Dananhu formation was island arc of sea facies and that of Tousuquan was continental facies Unconformity between them meants an epeirogenic movement, so we established it 'Big marsh movement' This movement made the earth crust risen and the north Tianshan ocean close At last,evolution history of north Tianshan ocean was over