THE SEDIMENTARY ENVIRONMENT OF LINXI FORMATION IN TAOHAIYINGZI AREA OF ARU-HORQIN QI, INNER MONGOLIA
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摘要: 阿鲁科尔沁旗陶海营子地区是上二叠统林西组发育较好的典型地区之一.林西组岩性为一套以黑、灰黑、灰绿色调为主的砂板岩组合，上部含丰富的非海相生物化石.应用地球化学方法，对陶海营子剖面和鲁D2井上二叠统林西组泥岩样品进行常量、微量元素分析，发现林西组整体具有高硅、铝、钙，低磷、锰的特点.并结合化石组合特征和保存状态，对林西组沉积环境进行探讨.认为该地区林西组形成于咸水-淡水的沉积环境，水体环境有一个逐渐淡化的过程.底部为海陆交互相沉积环境，上部为陆相淡水湖泊沉积环境.Abstract: Taohaiyingzi in Aru-Horqin Qi is one of the typical areas where Late Permian Linxi Formation is well developed. Linxi Formation is lithologically dominated by the assemblage of black, dark gray and celadon sandstone and slate, with rich non-marine fossils in the upper part. The mudstone samples from Linxi Formation in Taohaiyingzi profile and LD2 well are analyzed for constant elements and trace elements with geochemical method. It is found that the Linxi Formation is generally characterized by high silicon, aluminum and calcium, and low phosphorus and manganese. Based on the fossil assemblage and preservation condition, it is believed that the Linxi Formation in this area was formed in the sedimentary environment of salt-fresh water, with a desalting process. The bottom of the formation is in the sedimentary environment of sea-land interaction; while the upper part is the fresh water lake of continental facies.
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Key words:
- Linxi Formation /
- geochemistry /
- sedimentary environment /
- Aru-Horqin Qi /
- Inner Mongolia
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