恢复酒西地区白垩系变形盆地原始沉积边界的方法探讨

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APPROACH ON THE METHOD FOR RESTORATION OF ORIGINAL SEDIMENTARY BOUNDARIES OF THE CRETACEOUS DEFORMED BASIN IN JIOUXI AREA

摘要: 作者根据沉积学原理,利用河西走廊昌马、宽台地区现代洪积扇不同相区砾石直径的实测资料、鸭西地区砂砾岩厚度随相带分布趋势的统计资料,建立了砾石平均直径和砂砾岩厚度与搬运距离关系的指数方程.利用这两个关系式及白垩系沉积地层等厚线走向的延伸趋势,对酒西地区祁连山北缘的白垩系变形盆地的原始沉积边界作了恢复.

Abstract: On the basis of the principles of sedimentology, using the data of field measurements on the diameters of gravels of different facies in modern diluvial fans in the areas of Changma and Kuantai on Hexi Corridor, and the statistical data for the trend of thickness variation of sandy conglomerates in Jixi area versus facies belts, the exponential equations for the relations between mean diameter of gravels and the thickness of sandy conglomerates with transportation distanceare etablished. The two equations and the trend of the strike of isopaches of the Cretaceous were applied to restoring the original sedimentary boundaries of the Cretaceous deformed basin in northern margin of Qilian Mountain, Jixiarea.

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