地质学报Issue(11)：1921-1935,15.
鄂尔多斯盆地奥陶纪马家沟期岩相古地理演化与成钾意义
Evolution of Lithofacies Paleogeography in the Ordos Basin and Its Implication of Potash Formation
摘要
Abstract
This research is mainly on the basis of eight backbone wells including Longtan1 well and Zhenjia1well.Through drill core observation,well logging interpretation,microscopic slice identification and sedimentary microfacies analysis,combined with regional tectonic information and reference to the predecessors’achievements,the sedimentary facies of ordovician Majiagou Formation in the northern Shaanxi salt basin has been recognized and classified.Also compilation and revision of lithofacies paleogeographic maps in each majiagou period from 1 to 6 has been completed.The results show that carbonate platform facies accouts for the most in majiagou formation of shaanxi salt basin,along with open platform and restricted evaporate platform subfacies development.The restricted evaporate platform closely related to potash formation is further divided into microfacies,such as dolomitic flat,salt lake, gypsum lake,desalination lagoon.Paleogeographic research shows that 6 paleogeographic units including land,dolomitic flat,salt lake,gypsum lake,open platform and shallow lake has been developed during Majiagou Stage from 1 to 6.The distribution of paleogeographic unit in each member is different respectively.The key strata of potash-forming in the research area,in another word Om5 6 appears the paleogeographical pattern of “two depressions and one lifting”which is the core factor for the formation of secondary salt sag.Looking for favorable potash sag is the key to breakthrough in the northern Shaanxi salt basin.关键词
奥陶纪/马家沟组/岩相古地理/成钾盐凹/马五段 6 亚段Key words
Ordovician/Majiagou Formation/lithofacies paleogeography/northern Shaanxi salt basin/potash sag引用本文复制引用
张永生,朱常伟,邢恩袁,王卓卓,郑绵平,施立志,苏奎,桂宝玲,吴素娟,蒋苏扬..鄂尔多斯盆地奥陶纪马家沟期岩相古地理演化与成钾意义[J].地质学报,2015,(11):1921-1935,15.基金项目
本文为国家重大基础研究计划973课题“鄂尔多斯奥陶纪古陆表海盆成钾条件、机理和后期演化”（编号2011CB403001）、中国地质调查局地调工作项目“陕北奥陶纪盐盆地钾盐资源调查评价”（编号1212011085516）联合资助项目的成果。 （）
