Composition and particle characteristics of suspended heavy minerals in Yangtze River estuary and East China Sea inner continental shelf
LIU Mengjia1, HUANG Xiangtong1, LIAN Ergang1,4, HU Zhongya1, YUE wei2, WANG Zhongbo3, YANG Shouye1
1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China; 2 School of Geography,Geomatics & Planning,Jiangsu Normal University,Jiangsu Xuzhou 221116,China; 3 Guangdong Key Laboratory of Marine Disaster Early Warning and Protection,Institute of Marine Sciences, Shantou University,Guangdong Shantou 515000,China; 4 Ecological Environment Monitoring and Scientific Research Center,Ministry of Ecology and Environment Taihu Lake Basin East China Sea Ecological Environment Supervision Administration, Shanghai 200125,China
Abstract：The mineral composition and particle size of heavy minerals in sediment are important indicator for revealing sediment sources and hydrodynamic sorting processes. However,due to the limitations of research methods,there is still no research on the relationship between the heavy mineral composition, provenance and hydrodynamic sorting of fine-grained sediments in the Yangtze River. In this study,the TESCAN Integrated Mineral Analyzer(TIMA)was used to study the composition and particle size of heavy minerals in different water layers of the Yangtze River Estuary and East China Sea inner continental shelf. In parallel, the automatic identification results of fine-grained heavy minerals were verified by electronic probe analysis. The study shows that the characteristic heavy mineral assemblages in the suspended solids in the Yangtze River Estuary is hornblende,epidote and ferruginous metal minerals,which is consistent with the characteristic heavy mineral assemblages in the sediments of the lower reaches of the Yangtze River. There is an excellent correlation between the heavy mineral composition of suspended matter in the Yangtze River estuary and sediment in the lower reaches of the Yangtze River,indicating that its source is related to the Yangtze River. However,hematite/magnetite is relatively enriched in the suspended matter outside the Yangtze River estuary,which may be the result of the reworking and diffusion of medium density heavy minerals caused by strong tide. It is worth noting that abnormal enrichment of chromite appears in suspended matter samples at stations near Zhoushan Islands,which may be related to human production activities in the sea area. The vast majority of suspended heavy mineral particles in the Yangtze River Estuary are coarse silt to extremely fine sand,enriched in the coarser fractions(Ф<D0.5)of suspended solids,which are mainly carried and transported by runoff. There is no significant difference in the particle size between different types of heavy minerals in suspended solids in different water layers, indicating that they are less affected by sedimentation differences.
LIU Mengjia,HUANG Xiangtong,LIAN Ergang et al. Composition and particle characteristics of suspended heavy minerals in Yangtze River estuary and East China Sea inner continental shelf[J]. JOPC, 2024, 26(2): 431-445.
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