摘要
南天山野云沟石炭系的沉积特征和构造背景研究,有助于合理建立塔里木北缘含油气盆地古地理格局和区域构造格架。石炭系上部碎屑岩中发育典型的鲍玛序列,粒度统计分析显示,其水动力状态为浊流成因,从而确认南天山野云沟石炭系中存在浊积岩。通过对该碎屑岩的岩相分析,认为其可能形成于海底扇环境。26组古流向资料计算表明,其物源来自南侧的古塔里木陆块;12个砂样的碎屑成分统计、10个样品的岩石常量元素资料和3个样品的岩石稀土元素资料分析,说明其形成的构造背景属再旋回造山带和被动大陆边缘。
The study of sedimentary characteristics and tectonic background of the Carboniferous in Yeyungou area of South Tianshan will be great helpful to reconstruct the paleo geography and regional tectonics in northern margin of Tarim basin .Identification of Boma sequences in the field and the statistics of sediment grains indoor about Carboniferous rock in Yeyungou area have demonstrated that the upper parts of the strata are actually marine turbidites.According to the preliminary analysis of sedimentary facies,the authors point out that those rocks are likely formed in marine fan environment.Paleocurrent orientation by recovery original curvent orientation from 26 groups of strikes shows that the sediments came from Paleo Tarim continents.The statistics of sediments mineral composition from 12 samples and the data of chemical composition from 3 samples indicate that the tectonic background of the turbidites is the recycled orogenic belt and a passive continental margin environment.This paper first systematically reports the turbidites in Carboniferous of this area.
出处
《新疆地质》
CAS
CSCD
1999年第3期45-51,共7页
Xinjiang Geology
基金
国家"30 5"项目! 96 -91 5 -0 4 -01
关键词
南天山
野云沟
石炭系
浊流沉积
构造背景
新进展
South Tianshan
Yeyungou
Carboniferous
turbidites
tectonic background
new progress
