试论渭河裂谷成因机制及其意义

渭河裂谷(或渭河地堑)是鄂尔多斯地块南侧的新生代断陷带。本文通过对该区中生代以来区域构造应力-应变场的分析并结合力学分析,认为渭河地区在中生代时,是在由南向北的侧向挤压力作用下形成的一个大型隆起带,且因岩石圈的向上拱起带动了软流圈物质的上涌,从而为新生代裂谷的形成奠定了基础,且对其北侧邻区中生代聚煤作用有明显的控制作用。

DISCUSSION ON GENESIS MECHANISM AND ITS SIGNIFICANCE OF WEIHE RIFT

Weihe rift (or graben) is a Neogoic fault-subsiding belt in the south of Ordos block. By means of the analysis of regional tectonic stress-strain fields of this district in Mesozoic-Neozoic times and combinded with mechanical analysis it is regarded that the weihe region was a giant upward zone during Mesozoic formed due to the lateral compressive stress from south to north. The upward arching of lithosphere caused the rise of as the nospheric material,thus laying a foundation for the formation of weihe rift in Neozoic and having an obvious controlling action to the Mesozoic coal accumulation in the adjacent area to the north of weihe rift.