SEDIMENTARY ENVIRONMENT AND ITS EVOLUTION OF CHANGFANGGOU GROUP IN DALONGKOU REGION

Lou Zhanghua; Zhao Xiafei; Liu Zhigang; Wang Yao

doi:10.11743/ogg19950104

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SEDIMENTARY ENVIRONMENT AND ITS EVOLUTION OF CHANGFANGGOU GROUP IN DALONGKOU REGION
Vol. 16, Issue 1, Pages: 31-38(1995)
Online First：25 March 1995，

Published：1995
DOI： 10.11743/ogg19950104
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DOI：

Lou Zhanghua, Zhao Xiafei, Liu Zhigang, et al. SEDIMENTARY ENVIRONMENT AND ITS EVOLUTION OF CHANGFANGGOU GROUP IN DALONGKOU REGION[J]. 1995, 16(1): 31-38. DOI： 10.11743/ogg19950104.

摘要

仓房沟群(P

-T

)发育于准噶尔盆地的东部

厚1000m士

由冲积扇、曲流河、低弯度河、网状河和湖泊相组成。沉积特征和变化反映了气候逐渐干旱、植物逐渐稀少和周期性活动的构造背景。气候和构造的变化导致沉积环境的演化

曲流河演化到低弯度河是由温暖、潮湿的气候和植物丰富的自然环境演化到炎热、半干旱的气候和极少或无植物环境的过程。随着物源区抬升

低弯度河网状化

发育楔状网状河相。

Abstract

The Changfanggou Group(P

-T

)

developed at the east part of Junggar is represented by some 1000m of elastic sediments which comprises fluvial-fan factes

meandering stream factes and low-sinuosity stream facies

braided stream factes and lacustrine fade.Sedimentary properties and the changes in fluvial styles reflect an increasing aridity and decreasing flora population under cyclic tectonic active condition during P

-T

period.The changes in paleoclimate and paleotectonics resulted in the variation of sedimentary environment.The variation from meandering stream to low-sinuosity stream was a process from warm and humid climate

luxuriant plants to hot and semiarid climate

nonvegetation enveronment.The low sinuosity streams become braid streams and wedge-shaped braid factes developed in the study area with the uplift of provenance.