新疆库鲁克塔格地区新元古代层序地层学研究及对比
Neoproterozoic sequence stratigraphy and correlation in Quruqtagh area, Xinjiang
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摘要: 新疆库鲁克塔格地区上元古界可分为五个沉积层序，由下到上分别对应于贝义西组、照壁山组、阿勒通沟组、特瑞爱肯组至水泉组和汉格尔乔克组。第1层序由贝义西组构成，发育由粗碎屑斜坡扇和低水位楔构成的低水位体系域，向上逐渐变为粉砂岩、泥岩的海进体系域，并以向上变粗的退积准层序的高水位体系域结束，反映陆缘发展初期海平面的升降变化。第2层序由照壁山组构成，底部为粗粒石英砂岩，向上变为细粒砂岩、页岩互层，上部出现厚约30m的泥岩，顶部为紫红色砂岩，代表了由低水位经快速海进到高水位的变化过程，整体为水体较浅的滨浅海沉积环境。第3层序由阿勒通沟组构成，为冰成杂砾岩、砂岩、页岩组合，顶部出现厚2～3m的白云岩，沉积主体为低水位体系域，顶部白云岩为海进体系域，缺失高水位体系域。第4层序发育最为完整，特瑞爱肯组冰成杂砾岩为低水位体系域，冰成杂砾岩之上“盖帽碳酸盐岩”为海进体系域，扎摩克提组浊积岩、育肯沟组页岩、水泉组碳酸盐岩为高水位体系域，其中育肯沟组页岩为凝缩段沉积。第5层序低水位体系域由汉格尔乔克组冰成杂砾岩构成，顶部泥灰岩和白云岩为海进体系域，由于顶部被寒武系不整合覆盖，缺失高水位体系域。研究区上元古界层序基本可以和我国华南及印度Lesser Himalaya地区对比。
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Key words:
- Sequence stratigraphy /
- Neoproterozoic /
- Quruqtagh area /
- Xinjiang
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