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Geochemistry of cherts from Madaer area in Southwest Tianshan Mountains: Implications for deposition environments
Author(s): 
Pages: 79-89
Year: Issue:  1
Journal: Acta Petrologica et Mineralogica

Keyword:  radiolarian chertsgeochemistryorigindepositional settingSouthwest Tianshan;
Abstract: 西南天山马达尔地区乌帕塔尔坎群硅质岩与玄武岩以逆冲断层接触产出,但其时代缺乏依据.本次研究的硅质岩中含有放射虫,经鉴定时代为D_3-C_1.11件硅质岩样品的SiO_2含量为88.80%~93.28%,Al_2O_3含量为2.02%~3.72% ,其中只有4件样品为纯硅质岩(SiO_2 的含量为91.0%~99.8%),所有样品的SiO_2/Al_2O_3值(23.84~46.11)远低于纯硅质岩...
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