The Origin and Preservation of Suspended Barites near the 90°E Ridge in the Northeastern Indian Ocean

作     者：BU Xuejiao LIU Ming DING Yi YANG Yadi HUANG Mu SUN Xiaoxia FAN Dejiang YANG Zuosheng BU Xuejiao;LIU Ming;DING Yi;YANG Yadi;HUANG Mu;SUN Xiaoxia;FAN Dejiang;YANG Zuosheng

作者机构：College of Marine GeosciencesOcean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and TechnologyMOEOcean University of ChinaQingdao 266100China Shandong Provincial No.4 Institute of Geological and Mineral SurveyWeifang 261021China Key Laboratory of Marine Geology and MetallogenyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine GeologyQingdao National Laboratory for Marine Science and TechnologyQingdao 266061China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2023年第22卷第1期

页      面：88-98页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by the COMRA Major Project(No.DY135-S1-01-09) the Opening Foundation of Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ocean University of China(No.SGPT-2019OF-02) 

主　　题：marine barite Indian Ocean origin and sedimentation process dissolution and preservation 

摘      要：Suspended particulate barite crystals were detected in the water columns at four different stations near the 90°E ridge in the Indian *** distinct morphological types of marine barites were distinguished:euhedral-subhedral crystals,oval or round crystals,rhombic crystals,and irregular *** barite crystals in the study area are typically fine,with a dominant size of 1–3μ*** vertical distribution of barites is significantly affected by the formation and sedimentation *** begin to appear at a depth of 30 m and are formed primarily from the surface to the depth of 2000m with a concentration peak at the depth of 200m,where particles are coarser than those in the other *** barites begin to settle and dissolve once formed in the water column,resulting in finer barite particles and lower particle *** formation of barite crystals is related to biological processes associated with the decomposition of barium-rich skeletons in the microenvironment of decaying organic matter that is affected by the primary productivity and dissolved oxygen content in the water *** dissolving process of barite crystals showed similar variation with the concentration of dissolved barium in ocean water,and the substitution of strontium for barite in crystals promotes the selective dissolution of barite and exerts an important impact on its *** is approximately 33%of barites in the amount and 22%in the concentration to settle to the bottom of the water column compared to that observed in the main barite formation zone.