雪峰山西侧地区中上寒武统——层序地层学特征及层序格架

doi:10.13278/j.cnki.jjuese.201502115

摘要/Abstract

摘要：

综合利用沉积学、岩石矿物学、碳同位素地球化学等分析手段,对研究区中-上寒武统层序地层学特征进行了分析。结果表明:中-上寒武统可以划归为1个二级层序和5个三级层序,在二级层序时限范围内,浅水相区经历了由局限台地潮坪→开阔台地→局限台地潮坪的沉积演化,斜坡过渡带则经历了由台地边缘→前缘缓斜坡→台地边缘的演化,研究区东南部的深水相区则由深陆棚→盆地→浅水陆棚组成。三级层序海侵体系域中沉积的颗粒白云岩、叠层石礁以及晚期高水位体系域中形成的溶孔白云岩、岩溶角砾白云岩的层位具有重要的油气勘探潜力,是值得关注和研究的领域。

关键词: 米级旋回, 层序地层特征, 层序地层格架, 中-上寒武统, 雪峰山西侧

Abstract:

We present the sequence stratigraphy characteristics of the Middle-Upper Cambrian in the area of western Xuefeng Mountain through comprehensive analyses of sedimentology, rock mineralogy, carbon isotope geochemistry. Based on the results, the Middle-Upper Cambrian can be divided into one second-order sequence, and five third-order sequences. Within the time range of second-order sequence, the shallow waterfacies experienced sedimentary evolution from a confined platform tidal flat, to an open platform, then to aconfined platform tidal flat again; while the slope transition zone experienced sedimentary evolution from a marginal platform, to a frontier slow slope,and then to a marginal platform again. The deep water facies in the south-east of the research area is formed from deep shelf, basin, toshallow shelf. The grain dolomite, stromatolite reefs deposited during the third-order sequence of sea rise transgression and the dissolved porosity and karst breccia dolomite formed during the high sea level bear the significant potential for oil and gas exploration, and are worthy of further study.

Key words: meter-scale cyclic sequence, sequence stratigraphy characteristis, sequence stratigraphy framework, Middle to Upper Cambrian, western Xuefeng Mountains area

中图分类号:

P618.13

赵灿, 李旭兵, 郇金来, 陈孝红, 刘安, 危凯, 张华. 雪峰山西侧地区中上寒武统——层序地层学特征及层序格架[J]. 吉林大学学报(地球科学版), 2015, 45(2): 518-532.

Zhao Can, Li Xubing, Huan Jinlai, Chen Xiaohong, Liu An, Wei Kai, Zhang Hua. Characteristics of the Sequence Stratigraphy and Sequence Stratigraphy Framework, the Middle to Upper Cambrian in Western Xuefeng Mountains Area[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(2): 518-532.

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