奥陶系宝塔灰岩网纹构造成因研究进展及新发现

发布时间：2018-05-12 10:14

本文选题：奥陶系 + 宝塔灰岩　；参考：《沉积学报》2017年02期

【摘要】：综述了扬子地区分布广泛的奥陶系宝塔灰岩网纹构造成因的研究进展,整合了多位学者的主要观点及认识,结合四川旺苍唐家河等地奥陶系剖面的考察与镜下薄片观察,对网纹构造及其成因进行了深入研究并提出未来研究方向的思考与建议。学界目前普遍认为这种网纹构造并非暴露干裂成因,生物遗迹、海底硬地、准同生变形构造等成因解释也缺乏足够的证据支持,但关于水下胶缩、成岩作用以及构造作用等解释仍在热烈讨论中;对四川广元旺苍唐家河剖面宝塔灰岩的野外考察过程中发现了一些新的现象,比如在灰色宝塔灰岩中观察到了非沥青充填的"黑色细纹",网纹构造的形态、泥质含量等也随沉积旋回而呈现出规律性变化。进一步研究这些新的现象或许能为后期确定网纹构造的成因提供新的证据。
[Abstract]:This paper summarizes the progress of the research on the origin of the reticulated tectonics of the Ordovician Baota limestone, which is widely distributed in the Yangtze area, integrates the main viewpoints and understandings of many scholars, and combines the investigation of the Ordovician sections such as WangCang Tangjiahe, Sichuan Province, and the observation of the thin sections under the microscope. This paper makes a deep study on the mesh structure and its origin, and puts forward some thoughts and suggestions on the future research direction. At present, it is generally believed that this kind of netted structure is not exposed to dry crack origin, biological relics, undersea hard ground, quasi-syngenetic deformation structure and other genetic explanations are also lack of sufficient evidence to support, but about underwater glue shrinkage. The explanations of diagenesis and tectonism are still under heated discussion, and some new phenomena have been discovered during the field investigation of the pagoda limestone in the Tangjiahe section of Guangyuan, Sichuan. For example, the "black fine grain" of non-bituminous filling is observed in grey pagoda limestone, and the shape of netted structure and the content of mudstone also show regular changes with sedimentary cycles. Further study of these new phenomena may provide new evidence for the later determination of the origin of the mesh structure.
【作者单位】：西南石油大学四川省天然气地质重点实验室;西南石油大学地球科学与技术学院;页岩气评价与开采四川省重点实验室;四川省煤田地质局;川庆钻探物探公司一分公司;
【基金】：油气藏地质及开发工程国家重点实验室开放课题(PLN1523) 四川省教育厅重点项目(16ZA0078) 西南石油大学青年教师“过学术关”项目(201231010014)~~
【分类号】：P534.42

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