地质通报2012，Vol.31Issue(7)：1142-1154,13.
西秦岭徽县-成县早白垩世盆地沉积特征及其构造意义
Depositional characteristics of Early Cretaceous Huixian-Chengxian basin in western Qin ling Mountains and their structural significance
摘要
Abstract
The Huixian-Chengcian (Huicheng) basin is a well-preserved pull-apart basin in the western Qinling orogenic belt. There exist various depositional sedimentary lithofacies that show obvious spatiai variations. The sedimentary evolution of Huicheng basin can be divided into four stages. The first stage was characterized by minor sediments of Tianjiaba Formation, and the second stage by basin expansion of Zhoujiawan Formation; the third stage of early Jishan Formation was a maximum basin and the fourth stage had features of sedimentary infilling. In the sedimentary period of Tianjiaba Formation, alluvial fan and braided river dominated proximal areas of the southern basin margins; in the sedimentary period of Zhoujiawan Formation, coarse-grained sedimenn dominated the western basin margin; and in the sedimentary period of early Jishan Formation, alluvial fan and braided river dominated proximal areas of the southern and northern basin margins. Fine-grained lacustrine (prodelta) sediments were prevalent in the basin center. The middle basin was mostly fluvial and delta sandstone and conglomerate &cio associations. Sediments were mainly derived from granite and pre-Jurassic rocks in the north and the south, as indicated by restored paleo-current directions and provenance. Tectonic subsidence and sedimentation were primarily controlled by the Huifeng border faults on the northern margin of the basin. The uplift of pre-Jurassic rocks resulted from the tilting of border faults, and this area became the main provenance area.关键词
徽成盆地/西秦岭造山带/早白垩世/沉积特征Key words
Huicheng basin/ western Qinling orogenic belt/ Early Cretaceous/ depositional characteristics分类
天文与地球科学引用本文复制引用
张英利,王宗起,闫臻..西秦岭徽县-成县早白垩世盆地沉积特征及其构造意义[J].地质通报,2012,31(7):1142-1154,13.基金项目
中国地质调查局项目《陕西紫阳—岚皋地区铁铜矿成矿环境与勘查研究》(编号:1212011121091)和中央级公益性科研院所基本科研业务费项目《徽成早白垩世盆地原型恢复及成矿条件分析》(编号:K0917) （编号:1212011121091）
