Geological Features and Significance ofOlistostromes from Lower Part of the Mantou Formation in the LuxiAreas, Shandong Province
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摘要: 华北地台馒头组以干热气候条件下的陆源细碎屑岩为主夹碳酸盐岩组成,角度不整合于太古宙泰山群之上。济南仲宫镇的馒头组底部,为厚度约 4m的滑塌堆积。岩块由灰岩和细碎屑岩组成,基质为粉砂岩。岩块内部的构造变形样式及基质中的斜层理表明,寒武纪华北地台曾存在古斜坡和构造隆升作用是诱发成岩作用过程中滑塌堆积形成的重要机制。馒头组中滑塌堆积的发现和研究,有利于进一步认识华北地台古生代古地貌、沉积环境以及古潜山的形成和演化,从而为华北地台古生代含油气盆地和古潜山的研究以及油气资源勘探提供借鉴。Abstract: The Mantou Format ion in the North China platform, which overlain the Archaean Taishan Group, mainly consists of terrigenous clastic rocks and carbonate interca lations. In the Zhonggong village of the Jinan city, olistotrome with thickness of about 4m occurred in the lower part of the Mantou Formation. Carbonate and fine clastic rocks is its block, and siltstone is its matrix. Deformation styles of the blocks and cross bedding within the blocks demonstrate that there should ex ist an old slope in the North China platform and tectonic uplifting had took place in the Cambrain. They were main factors to induce olistotrome. Identifying and studying the olistostrome with in the Mantou Formation is benefit to study the Paleozoic paleogeography and sedimentary env ironments of the North China platform and the evolution of the buried hills, which can provide some good evidences for the study on the Paleozoic sedimentary basin contained with abundant oil and gas and buried hills, and for prospecting source of oil and gas.
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Key words:
- Mantou Formation /
- olistostrome /
- old uplift /
- buried hills /
- North China platform
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