成都理工大学学报（自然科学版）2017，Vol.44Issue(5)：589-601,13.DOI:10.3969/j.issn.1671-9727.2017.05.09
鄂尔多斯盆地南缘晚古生代沉积物源及其对秦岭造山带北部演化的指示
Provenance analysis of the late Paleozoic sediments in south margin of the Ordos Basin and its indication to evolution of the north of Qinling Orogenic Belt in China
摘要
Abstract
The formation,evolution and sedimentary characteristics in the south margin of Ordos Basin are closely related to the activities of the Qinling Orogenic Belt in the south of North China Cratonic Basin.Provenance characteristics of late Paleozoic sediments in the area are studied so as to extract information on the evolution of the Qinling Orogenic Belt.Based on petrological characteristics from two field sections of Benxi-Shiqianfeng Formation in Chengcheng and Hancheng,provenance information of the late Paleozoic sediments in southern Ordos Basin and evolution process of the north Qinling Orogenic Belt in late Paleozoic is obtained through analysis of rock compositions,grain compositions,heavy mineral compositions and tectonic setting discrimination by Dickinson triangular diagrams.It reveals that the provenance of Benxi-Taiyuan Formation is originated from the southern margin of the Qinling Orogenic Belt of North China Plate,and the provenance of Shanxi-Shiqianfeng Formation is originated from the north Qinling tectonic belt.Initial point collision of Shangdan belt during late Devonian and late Carboniferous period resulted in the uplift of the southern margin of the North China Plate.From early Permian,Qinling Orogenic Belt entered into surface collision stage and resulted in uplift of the north Qinling back-arc basin and island arc belt successively,which became the main provenance of the south margin of Ordos Basin.The east-west collision like scissors between the Yangtze plate and the North China Plate resulted in the change of paleocurrent direction from northwest in the Shanxi Formation to northeast in the Lower Shihezi Formation.关键词
鄂尔多斯盆地/晚古生代/物源/秦岭造山带Key words
Ordos Basin/late Paleozoic/provenance research/Qinling Orogenic Belt分类
天文与地球科学引用本文复制引用
李树霞,向芳,张瑶,王誉婉,王金元..鄂尔多斯盆地南缘晚古生代沉积物源及其对秦岭造山带北部演化的指示[J].成都理工大学学报（自然科学版）,2017,44(5):589-601,13.基金项目
成都理工大学优秀创新团队培育计划项目(KYTD201703). （KYTD201703）
