TRIASSIC STRATIGRAPHIC SEQUENCE AND DEPOSITIONAL ENVIRONMENT IN THE NANPING ZOIGE AREA NORTHWESTERN SICHUAN
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摘要: 川西北地区三叠系广泛发育，其地层层序及岩性特征与相邻的西秦岭南部一带十分相似。根据若尔盖—南坪实测地层剖面资料的对比研究，将该区三叠系划分为：中三叠统光盖山组和上三叠统咀朗组、纳鲁组、卡车组４个岩石地层单位。通过沉积相标志的综合分析，该区中—晚三叠世时期主要有以下几种沉积类型：碳酸盐岩碎屑流沉积，等深流沉积，陆源碎屑浊流沉积，非重力流正常深海盆碳酸盐岩及碎屑岩沉积。表明该区为大陆斜坡至深海盆地环境Abstract: Triassic strata are widespread in the Nanping Zoige area, northwestern Sichuan Province. The Triassic stratigraphic sequence and lithological character in this area is very similar to those of its neighboring southern West Qinling. Through comparative study of the data of Triassic stratigraphic sections in the Nanping Zoige area, four Triassic lithostratigraphic units are recognized. In ascending order they are: （1） the Middle Triassic Guanggaishan Formation, （2） the Upper Triassic Zuilang Formation, （3） the Upper Triassic Nalu Formation, and （4） the Upper Triassic Kache Formation. Integrated analysis of indications of sedimentary facies indicates that there occur the four following Middle Upper Triassic sediment types: （1） carbonate debris flow deposits, （2） carbonate contourite, （3） terrestrial clastic turbidity current deposits, （4） non gravitation flow normal abyssal carbonate and clastic deposits.
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Key words:
- Triassic /
- stratigraphic sequence /
- depositional environment /
- northwestern Sichuan
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