摘要
西昆仑造山带中带上石炭统提热艾力组为一套浅变质碎屑岩沉积,四周被三叠纪岩浆岩所包围,研究其沉积环境及物源特征对揭示该区构造背景具有重要的意义。通过野外详细的剖面测制、沉积相标志的观察,结合室内岩矿鉴定和地球化学等综合分析,揭示该套碎屑岩具典型的鲍马序列结构特征,岩性成分成熟度低,主要为一套近物源的斜坡重力流沉积,其物源区较为复杂,主要为切割岩浆弧、过渡岩浆弧和再旋回造山带,源区构造环境为大陆岛弧及活动大陆边缘,表现出活动大陆边缘弧后盆地的沉积特点。
A section of Upper Carboniferous low-grade metamorphic clastic rocks in the Tireaili formation is found in the middle west Kunlun orogenic belt. It is surrounded by the Triassic igneous rocks. Study of depositional environment and source characteristics of sediment in this formation is significant to tectonic setting of this area. Through fine profile measuring, sedimentary facies signs, mineral identification, and geochemical analysis, we found that this clastic developed Bouma sequence which is low compositional ma- turity. This clastic rocks is set near the slopes of the provenance gravity flow deposits, and the provenance is complex, which mainly includes recycle transition, dissected arc and transitional arc source area. The tectonic environment include active continental margins and continental island arc, it displays the characteristic of back-arc basin in active continental margin.
出处
《地质通报》
CAS
CSCD
北大核心
2013年第5期751-759,共9页
Geological Bulletin of China
基金
中国地质调查局<1:5万J43E022021等5幅区域地质调查项目>(编号:1212077720539)
关键词
西昆仑
提热艾力组
沉积环境
地球化学分析
构造背景
West Kunlun
Tireaili formation
Depositional environment
Geochemical analysis
Tectonic setting
