岩石显微图像专题 最新来稿(未评审) 版本 ZH1
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西藏特提斯喜马拉雅早–中侏罗世岩石薄片偏光显微图像数据集
A photomicrograph dataset of the Early-Middle Jurassic rocks under thin section in the Tibetan Tethys Himalaya
: 2020 - 06 - 15
: 2020 - 06 - 29
41 0 0
摘要&关键词
摘要:中国西藏自治区南部特提斯喜马拉雅出露完整的侏罗系,是研究侏罗纪东特提斯古海洋、古环境和古地理演化的重要场所,也是探索冈瓦纳大陆裂解、洋中脊扩张、大火成岩作用和温室地球气候间相互作用的重要载体。定日和聂拉木地区的下–中侏罗统以碳酸盐岩为主,同时还发育碎屑岩和混积岩,由老到新划分为扎木热组、普普嘎组、聂聂雄拉组。迄今,藏南侏罗系研究程度不高,且地层存在重复或缺失等问题,不同研究区地层划分和对比仍存在较大困难。为了更好地服务今后的研究,如准确进行区域地层对比、避免重复的岩石学工作并高效利用已有研究成果等,本数据集利用偏光显微镜,对采集自定日卧龙剖面和聂拉木年多剖面的494个岩石薄片进行了单偏光和正交光两种形式的显微照片采集。本数据集详细介绍了这两个剖面的大地构造背景、古地理位置、采样位置、地层时代、岩石名称等信息。本数据集可以直接服务基础地质学研究,可大大提高研究人员的效率,同时可以依靠深时数字地球(DDE)平台,进行数据整合应用,从更广的空间和时间尺度解决重大科学问题,也可以服务找矿、找油、建筑、教学与科普等。
关键词:岩石薄片;显微图像;特提斯喜马拉雅;侏罗纪;碳酸盐岩
Abstract & Keywords
Abstract: The Jurassic is well exposed in the Tethys Himalaya, southern Tibet, China, which is an important area to study the paleo-ocean, paleoenvironmental and paleogeographical evolution of the eastern Tethys. It is also the important carrier to understand the interaction between Gondwana rifting, mid-ocean ridge expansion, large igneous province, and Earth’s greenhouse climate. The Lower-Middle Jurassic in Tingri and Nyalam are dominated by carbonate rocks, together with siliciclastic and mixed carbonate-siliciclastic rocks. From bottom to top, they were divided into the Zhamure, Pupuga, and Niexiongla formations. To date, the study of the Jurassic in southern Tibet is poor, and it is still difficult to accurately divide and compare lithologic units at different areas because of tectonic repetition and incompleteness of stratigraphic record. In order to better serve the future research, such as accurate regional stratigraphic comparison, avoiding repeated petrological work, and efficiently using of published results. This dataset collected micrographs of 500 thin sections from the Wölong (Tingri) and Nianduo (Nyalam) sections using microscopes at the conditions of single polarized light and orthogonal light, respectively. The details of tectonic setting, paleo-geographic location, sampling sites, stratigraphic age, and rock name of these two sections are present in this dataset. It can directly serve basic geological research, greatly improving the efficiency of researchers. At the same time, data integration and application can be performed relying on the deep-time digital earth (DDE) platform to solve major scientific problems on a wider space and time scale. In addition, this dataset can also serve prospecting, oil exploration, construction, teaching and popular science.
Keywords: thin section; polarized photomicrograph; Tethys Himalaya; Jurassic; carbonate rocks
稿件与作者信息
韩中
Han Zhong
胡修棉
Xiumian Hu
huxm@nju.edu.cn
出版历史
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