由王德利老师邀请的广东海洋大学蒲晓强博士将来访我实验室，并计划于8号（星期三）上午为我们做一场学术报告，详情如下：
报告时间：7月8号（星期三）上午9：30-10：30
报告题目：中国典型海域沉积物早期成岩过程中硫化物特征
报告地点：曾呈奎楼B-105
Talk Abstract
The acid volatile sulfide (AVS) content in the sediments of the Yellow Sea and theSouth China Seawas determined. We found that theAVScontent decreased in the following order: Licun estuary in theJiaozhouBay>JiaozhouBay> the East China Sea continental slope > the Yellow Sea continental shelf > the East China Sea continental shelf > theSouth China Seaslope. Based upon our results of sulfide, reactive metals, and pyritization of sediment cores collected from the Yellow Sea and South China Sea, and published results of sediments from the East China Sea, we concluded that sediment organic carbon content was the major factor that controlled the formation of sulfide in sediments of theChineseMarginalSeas. Reactive iron would become the controlling factor only in environments with very high organic carbon supply, such as the Licun estuary. The quantity and quality of organic matter, sedimentation rate, redox condition, bottom water temperature, and burial time all could influence the formation, quantity and transform of sulfides in the sediments.
In sediment core NH-1, retrieved from theSouth China Sea, a pyrite content maximum was found at the depth of141.5cm. Extensive sulfate reduction took place at depths between 120-141.5cm. Combining previous results obtained from cores collected to the west of our core, we thought that the depth of141.5cmmight represent the boundary of Late Pleistocene glacial and Holocene post-glacial period. The highAVScontents appeared near the bottom of the sediment core, which was abnormal asAVSin most marine sediments had mid-depth maximum. Both δ34S of pyrite andAVScontent showed abnormal value at the 247.5～380.5cminterval of the sediment core NH-1, suggesting intensive methane upward flux and possibly the formation of gas-hydrate at greater depth at this location.
