Germanium occurrence in Lincang superlarge deposit in Yunnan,China |
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| Authors: | Hanping Zhuang Jialan Lu Jiamo Fu Jinzhong Liu Chigang Ren Degang Zou |
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| Institution: | (1) Laboratory of Marine Geology of State Education Commission, Tongji University, 200092 Shanghai, China;(2) Chinese Academy of Sciences, Nanjing Institute of Geology and Paleontology, 210008 Nanjing, China;(3) State Oceanic Administration, Second Inistitute of Oceanography, 310012 Hangzhou, China |
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| Abstract: | Quantitative analyses have been carried out on radiolarians from 65 samples of Core 255 in the southern Okinawa Trough. The
distribution of taxa and the results of Q-mode factor analysis show that during the last 20 000 years three radiolarian assemblages
could be distinguished which can be correlated to high and low productivity levels indicated by the organic carbon content,
radiolarian abundance and ratio of Nassellaria/Spumellaria in the sediment. TheTetrapyle quadriloba assemblage of thr last glaciation and deglaciation is associated with high productivity whereas the early HolocenePolysolenia spinosa and the middle and late HoloceneCarposhaera globosa assemblages correspond to low surface productivity. Meanwhile, the variations in the ratio of radiolarian fragments indicate
higher SiO2 dissolution during the Holocene than during the last glacial stage. |
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| Keywords: | radiolarian assemblages dissolution surface productivity Okinawa Trough |
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