鄂尔多斯盆地早古生代构造演化特征分析
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摘要
为明确鄂尔多斯盆地早古生代构造演化特征,对中晚元古代盆地雏形形成、寒武纪及奥陶纪盆地构造活动特征进行了分析。研究表明:中晚元古代时期盆地主体东部为北北东弧形走向的吕梁隆起,盆内发育有庆阳隆起,盆地主体坳陷的雏形已经形成;寒武纪,加里东运动加速了盆地的差异升降活动,盆地主体扩大,北部形成了阿拉善-阴山隆起区,伊盟隆起继续发育,庆阳隆起由北东走向稍作左旋呈近南北走向;奥陶纪,差异升降运动加速了盆地沉积盖层的发育,为早古生代地层的主要发育期。此时,近西部庆阳隆起与南部洛阳隆起连成一片,形成庆阳-洛阳的呈"L"形窄带隆起区,绥榆坳陷东侧的吕梁隆起逐渐消失,代之以规模较小的恒山隆起与太岳-吕梁隆起,两隆起在太原西南附近倾没消失。
In order to clarify the tectonic evolution characteristics of Ordos basin in early Paleozoic, the preliminary formation,Cambrian and Ordovician tectonic activity characteristics were analyzed. The research shows that the eastern part of the basin in the middle and late Proterozoic was the Lvliang uplift, which was arc-shaped. During the Cambrian period, the differential uplift of the basin was accelerated by Caledonian movement, the main body of the basin expanded, the Alashan-Yinshan uplift was formed in the north area, and the Yimeng uplift continued to develop, and the Qingyang uplift moved slightly from the northeast to the south area.In the Ordovician, differential movement accelerated the development of sedimentary cover in the basin, which was the main developmental period in early Paleozoic strata. At this time, the Qingyang uplift in the west was connected with the Luoyang uplift in the south area, forming an "L" narrow belt uplift in Qingyang-Luoyang, and the Lvliang uplift in the east of Suiyu depression gradually disappeared, replaced by the smaller Hengshan uplift and Taiyue-Lvliang uplift.
In order to clarify the tectonic evolution characteristics of Ordos basin in early Paleozoic, the preliminary formation,Cambrian and Ordovician tectonic activity characteristics were analyzed. The research shows that the eastern part of the basin in the middle and late Proterozoic was the Lvliang uplift, which was arc-shaped. During the Cambrian period, the differential uplift of the basin was accelerated by Caledonian movement, the main body of the basin expanded, the Alashan-Yinshan uplift was formed in the north area, and the Yimeng uplift continued to develop, and the Qingyang uplift moved slightly from the northeast to the south area.In the Ordovician, differential movement accelerated the development of sedimentary cover in the basin, which was the main developmental period in early Paleozoic strata. At this time, the Qingyang uplift in the west was connected with the Luoyang uplift in the south area, forming an "L" narrow belt uplift in Qingyang-Luoyang, and the Lvliang uplift in the east of Suiyu depression gradually disappeared, replaced by the smaller Hengshan uplift and Taiyue-Lvliang uplift.
引文
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[4]邓军,王庆飞,黄定华,等.鄂尔多斯盆地基底演化及其对盖层控制作用[J].地学前缘,2005,12(3):91-99.
[5]耿元生,沈其韩,任留东.华北克拉通晚太古代末-古元古代初的岩浆事件及构造热体制[J].岩石学报,2010,26(7):1945-1966.
[6]冯增昭,陈继新,张吉森.鄂尔多斯地区早古生代岩相古地理[M].北京:地质出版社,1990.
[7]李思田,程守田,杨士恭,等.鄂尔多斯盆地东北部层序地层及沉积体系分析[M].武汉:地质出版社,1992.