摘要
本文在野外宏观和实验基础上,总结了华北地区石炭二叠系陆源碎屑物的特征及母岩类型。并通过对陆屑砂岩分布规律的研究和古河流流向的实测资料分析,探讨了陆源物质的来源,并指出了华北地区石炭二叠系沉积中心区大致位于济源—郑州一带。
Abstract
North China Area lined out in this paper is situated at east of Luliang Mountains and west of Tanlu Fault, and to north by Yanshan Mountain and Dabieshan Mountains to south, and it occupies about 600,000Km2. In order to work up the Upper Paleozoic lithofacies-paleogeographic map, 2500 thin sections, more than 100 heavy mineral specimens and some catho-doluminescence samples have systematically been sampled from 30 drillings and surface profiles. Based both on the field observations and in laboratory analyses, the author summarized the characteristics of Permo-Carboni-ferous terrigenous elastics and the types of source rocks in the area. There-after, the distributive regulation for terrigenous elastics are studied in more details, and the provenances of the terrigenous source materials have been approached on the basis of investigation on the direction of paleochannel. It is concluded that there are various provenances for Permo-Carboniferous terrigenous materials in North China Area, totally about 4-5 provenance areas,as well as some local depositional areas dominated by mini-paleouplifts. Such as terrigenous sediments not only derived from ancient land of Yingshan, Funiushan and the eastern part of Shandong Province, but also from ancient lands of Dabieshan Mountains and Luliang Uplift, and Zhongtiao Ancient Land in short period. Therefore, the sediments in the area were transported from all parts of north, south, east and west, and at that time, the depo-center was located at Jiyuan-Zhengzhou Area which basically is of a stable subsidence area in subsequent geological history.
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