四川峨边震旦系灯影组三段泥页岩地球化学特征及地质意义

发布时间：2018-05-09 03:24

本文选题：四川盆地 + 峨边县　；参考：《矿物岩石地球化学通报》2017年03期

【摘要】：为探讨川西峨边地区震旦系灯影组三段泥页岩沉积期氧化还原特征及构造-沉积背景,对其开展了矿物学、元素地球化学及同位素地球化学系统研究。结果表明,灯三段泥页岩硅、铝及钾元素富集,沉积期间气候温暖潮湿、受淡水及陆源物质影响明显。蓝灰色泥岩属氧化环境,为桐湾I幕运动地壳抬升剥蚀及局部火山作用的产物,物源以正常沉积为主、夹前震旦基底花岗斑岩;灰黑色页岩与拉张裂陷作用导致的海平面上升相关,属正常沉积物源供给的贫氧环境。裂陷槽西侧峨边地区桐湾I幕构造运动表现为早期剥蚀、后期快速海侵充填特征。
[Abstract]:In order to study the redox characteristics and tectonic-sedimentary background of the third member of the Dengying formation of the Sinian system in Ebian area western Sichuan the mineralogical elemental geochemistry and isotopic geochemical systems were studied. The results show that Si, Al and K are enriched in the third stage of Liangshan shale, and the climate is warm and humid during the deposition period, which is obviously influenced by fresh water and land-based materials. The blue-gray mudstone belongs to the oxidation environment and is the product of crustal uplift and denudation and local volcanism of the Tongwan I episode movement. The provenance is dominated by normal deposition and the pre-Sinian basement granitic porphyry. The grey and black shale is related to the sea level rise caused by tension rifting and belongs to the oxygen-poor environment supplied by the normal sediment source. The tectonics of Tongwan I in Ebian area on the west side of the rift trough is characterized by early denudation and rapid transgression and filling.
【作者单位】：西南石油大学地球科学与技术学院;四川省都江堰勘测设计院;
【基金】：国家自然科学基金青年基金项目(41202109) 四川省创新创业训练项目(201610615054) 西南石油大学启航项目(2015QHZ028)
【分类号】：P534.31;P618.13

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