国家冰川冻土沙漠科学数据中心

元数据

名称	Multielement Imaging Reveals the Diagenetic Features and Varied Water Redox Conditions of a Lacustrine Dolomite Nodule
科技资源标识	CSTR:11738.14.NCDC.XDA14.PP4356.2024
DOI	10.1155/2022/9019061
数据共享方式	开放下载
摘要	The genesis of dolostone has long been puzzling for more than two centuries. Although much work has been done on investigating the process of dolomitization, little emphasis has been put on examining the diagenetic water redox condition with the wealthy geochemical information preserved in primary dolomite, which is believed to archive the aqueous environment as well as biotic and/or abiotic effects during formation. In situ interpretation with high resolution is a prerequisite in refined research of dolomite. Here, we reported the multielement imaging results of a lacustrine dolomite nodule with the host black shale from the Songliao Basin, northeast of China. Micro X-ray fluorescence (μ-XRF) with a spatial resolution down to 10 μm was used for in situ scanning. Two key parameter settings of the μ-XRF, including single-point exposure time and spatial resolution, were optimized to achieve a better result in a reasonable scanning time scale. The final imaging data graphically revealed dynamic variation of elemental distributions, including elements enriched in dolomite (e.g., Ca, Mg, Fe, and Mn), clastic quartz (Si), and clay minerals (e.g., Al and K) and redox-sensitive trace elements (e.g., Cr, Mo, V, and U). The well-preserved laminated structures inside the nodule and the features with a magnesium-rich core wrapped with an iron-concentric outer layer and a manganese-concentric shell together indicated its primary form as dolomite and a gradual transformation into ankerite as well as manganese-ankerite. The elemental variation indicates a varied bottom water redox condition, which involved from sulfidic to ferruginous and manganous zones. Here, we propose that the intermittent supplies of sulfate and Fe-/ Mn-oxidized minerals interrupting the black shale deposition while favoring dolomitization might be brought by the oxidized and salted seawater. And this lacustrine dolomite is expected to be a potential fingerprint mineral in tracking the seawater intrusions to the Songliao Basin which happened 91 million years ago.
学科分类	170.50
关键词	Multielement Imaging Reveals Diagenetic Features Varied Water Redox Conditions Lacustrine Dolomite Nodule
作者	Yuke Liu,Wenyuan He,Jinyou Zhang,Zhenwu Liu,Fazi Chen,Huajian Wang,Yuntao Ye,Yitong Lyu,Zhiyong Gao,Zhichao Yu,Lina Bi and Shuichang Zhang
数据量	7.4 MiB
论文类型：	journal
论文网址：	https://doi.org/10.1155/2022/9019061
期刊名称：	Geofluids
出版时间：	2022-09-01

引用和标注

数据引用

Yuke Liu,Wenyuan He,Jinyou Zhang,Zhenwu Liu,Fazi Chen,Huajian Wang,Yuntao Ye,Yitong Lyu,Zhiyong Gao,Zhichao Yu,Lina Bi and Shuichang Zhang. Multielement Imaging Reveals the Diagenetic Features and Varied Water Redox Conditions of a Lacustrine Dolomite Nodule. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP4356.2024.

许可协议

本作品采用知识共享署名 4.0 国际许可协议进行许可。

扫码后在手机端浏览

项目信息详情

项目名称：深层油气形成与分布预测
项目编号：XDA14010000
项目类别：中国科学院战略性先导科技专项（A类）