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陕西凤县“十里墩群”的划分、对比及沉积环境探讨

DISCUSSION ON THE SUBDIVISION, CORRELATION AND DEPOSITIONAL ENVIRONMENTS OF PERMIAN SHILIDUN GROUP FENGXIAN, SHANXI
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摘要 陕西凤县地区的'十里墩群'包括下二叠统及上二叠统。上、下二叠统的划分及下二叠统内部的划分可与相邻的上扬子区进行对比。 '十里墩群'由一套深灰至黑色砂、板岩及塌积角砾岩组成,形成于陆棚边缘斜坡至槽盆环境。角砾岩中的灰岩角砾主要来自上扬于碳酸盐台地,砂、板岩中的陆源碎屑可能主要来自华北古陆。二叠纪时,凤县地区位于扬子碳酸盐台地与华北古陆之间的秦岭槽海南翼陆棚边缘由断陷形成的斜坡上,此斜坡走向北西西,向北倾斜。 Shilidun group in Fengxian of Shanxi province includes the sediments of Lower and Upper Permian. The Lower Permian and its subdivision can he correlated with; neighbouring Upper Yangtze area. Shilidun group consists of dark gray-black sandatones, slates, and slump breccias formed in the slope of the shelf margin to the trough. The limestone, gravels in the breccias were derived from the Upper Yangtze platform; and the source of terrigenous clasts, which were redeposited after reworking by sea water, was from the old land of North China. During Permian Fengxian area was located in the slope, of the southern shelf margin of Qinling trough between the Yangtze platform and North China Paleo-land where the fault subsidence took, place and resulted in the slope which inclines toward the north and has a NWW strike.
作者 张继庆
出处 《矿物岩石》 CAS CSCD 1989年第4期106-112,共7页 Mineralogy and Petrology
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