岩石显微图像专题 最新来稿(未评审) 版本 ZH1
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北拉萨地体白垩纪郎山组岩石薄片显微图像数据集
A photomicrograph dataset of mid-Cretaceous Langshan Formation from the northern Lhasa Terrane, Tibet
: 2020 - 06 - 23
: 2020 - 06 - 30
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摘要&关键词
摘要:沉积微相研究是碳酸盐岩沉积环境研究的基础,然而高度概括的微相划分容易丢失沉积环境的渐变演化过程。一条剖面所有薄片的显微图像可以很好地补充不同微相之间的连续变化过程。本文以西藏中部郎山组碳酸盐岩为对象,对区域上3条剖面、559个薄片进行显微拍照,并记录了样品的采集位置、地层时代、岩石名称、岩石特征等信息。本显微照片数据集显示郎山组岩性主要为灰岩和白云岩,其中灰岩以粒泥灰岩、泥晶灰岩和漂砾灰岩为主。本数据集可广泛地用于北拉萨地体白垩纪地层相关的基础地质学研究,也可应用于相关油气勘察等实践生产。其中,薄片中典型的沉积特征,还可以应用于白垩纪碳酸盐相模式研究、教学与科普。
关键词:拉萨地体;白垩纪中期;郎山组;偏光显微图像
Abstract & Keywords
Abstract: The microfacies analysis is basic for studying carbonate sedimentary environments. However, the concept of microfacies types includes a strong tendency to categorize which ignore the continuous change between different environments. A photomicrograph dataset of all thin sections sampled from one section is useful to solve this question. This study took the carbonate strata distributed in central Tibet called Langshan Formation as an example. We took polarized photomicrograph of 559 thin sections from 3 stratigraphic sections of the Langshan Formation, and described the location, age, lithology and petrography of these thin sections. The results show the lithology of the Langshan Formation including limestone and dolostone, where the wackestone, mudstone and floatstone are the dominants in the limestone. This photomicrograph dataset can be widely used not only in basic geological research, but also in oil exploration, carbonate facies model of mid-Cretaceous, teaching and popular science.
Keywords: Lhasa terrane; mid-Cretaceous; Langshan Formation; polarized photomicrograph
稿件与作者信息
许艺炜
Yiwei Xu
胡修棉
Xiumian Hu
huxm@nju.edu.cn
孙高远
Gaoyuan Sun
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