地质学报2012，Vol.86Issue(2)：269-279,11.DOI:11-1951/P.20120113.0857.011
苏北盆地高邮凹陷古近系戴南组一段元素地球化学特征及其地质意义
Geochemical Characteristics of the 1st Member of Paleogene Dainan Formation in Gaoyou Depression of the North Jiangsu Basin, and Its Geological Significance
摘要
Abstract
The type of weathering experienced in Gaoyou depression of North Jiangsu basin was mainly physical weathering. In the depression, the degree of chemical weathering suffered in the majority of the southern step-fault zone was more intensive and the paleoclimate was relatively warmer and damper than those in the northern counterpart. On the contrast, in the northern slope zone, including Huangjue and Shaobo area, the provenance underwent strong weathering or severe tectonic movement for having caused rapid denudation and fast sedimentation in the depression. Mother rocks in Gaoyou depression are mainly felsic rocks and recycling sedimentary deposits, containing little intermediate-basic magmatic source rocks. In strata of the 1st Member of Dainan Formation, the margin of Gaoyou depression and its neighbouring Wubao salient contained marine features that are similar to the underlying Funing Formation. Hence, we deduce that the majority of source rocks in studied area come from denuded original basement and recycling sedimentary deposits. Geochemical data display that the tectonic setting of studied area is included in the Andean-type continental margin. We deem that this tectonic setting of North Jiangsu basin reflects a special tectonics of East China and is differed to the typical Andean active continental margin of the eastern Pacific Ocean, for the big divergence between these two regions no matter in geologic history or in dynamic mechanism.关键词
苏北盆地/高邮凹陷/地球化学/物源/风化作用/构造背景Key words
the North Jiangsu basin/ the Gaoyou depression/ geochemical/ provenance/ weathering/ tectonic setting引用本文复制引用
张妮,林春明,周健,陈顺勇,张猛,刘玉瑞,董桂玉..苏北盆地高邮凹陷古近系戴南组一段元素地球化学特征及其地质意义[J].地质学报,2012,86(2):269-279,11.基金项目
本文为“内生金属矿床成矿机制研究国家重点实验室”自主研究基金项目(编号2009-Ⅱ-11)和教育部高等学校博士学科点专项科研基金项目(编号20090091110023)共同资助成果. （编号2009-Ⅱ-11）
