沉积学报2018，Vol.36Issue(3)：483-499,17.DOI:10.14027/j.issn.1000-0550.2018.031
鄂尔多斯盆地南缘奥陶系平凉组深水沉积特征及其与古环境关系——以陕西富平赵老峪地区为例
Research on Relationship between Characteristics of Deep-water Deposits and Palaeoenvironment in the Ordovician, Pingliang Formation, Southern Margin of the Ordos Basin:A case of Zhaolaoyu countryside, Fuping town, Shaanxi province
摘要
Abstract
Deep-water deposits and relationship between palaeogeography is one key point and weak spot of sedimen-tology. Deep-water deposits well develop in Ordovician of Pingliang Formation in the southern margin of the Ordos Ba-sin. The lithology is mainly micrite, muddy micrite, mudstone and chert in local. Current ripple, small scale of cross bedding, and bioturbation structure are very formed. Three typical lithofacies are interbedded micrite, chert, mud-stone and tuff, bioturbated micrite, and massive bedded calcirudyte, corresponding to slope autochthonous deposits, contourites, and debrites, whose geochemical characteristics including δ13 C-δ18 O, Th-U, Ga-Cu, B-Cr, B-Ga, B-Sr, Ni/Co-U/Th,B/Ga-U/Thand 87 Sr/ 86 Sr-Sr/Ba show various. Slope autochthonous deposits and debrites are upwarding decreasing, and the contourites are reverse. The relative sea-level is rising, paleosalinity indicates multi-high to low change cyclicities, paleoclimate changes more and more arid, and reducing action is enhanced during the Pingliang stage. The relative sea-level is rising, paleosalinity change obviously, humid climate, and strong reducing action are helpful to contourites. By contrast, low relative sea-level, arid climate and tectonic movement contribute to debrites.关键词
等深流/碎屑流/古地理/鄂尔多斯盆地/平凉组Key words
contourite/debrite/palaeogeography/Ordos Basin/Pingliang Formation分类
天文与地球科学引用本文复制引用
李华,何幼斌,黄伟,刘朱睿鸷,张锦..鄂尔多斯盆地南缘奥陶系平凉组深水沉积特征及其与古环境关系——以陕西富平赵老峪地区为例[J].沉积学报,2018,36(3):483-499,17.基金项目
国家自然科学基金项目(41472096,41502101) （41472096,41502101）
湖北省创新群体基金(2015CFA024) （2015CFA024）
长江青年基金(2015cqn26) National Natural Science Foundation of China, No. 41472096, 41502101 （2015cqn26）
Group Innovation Fund of HuBei Province, No. 2015CFA024 （）
Yangtze Youth Fund of Yangtze University, No. 2015cqn26 （）
