Shi Xuefa

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Quanshu Yan

First Institute of Oceanography

Bu WenRui

Yingchun Cui

Guizhou Academy of Sciences

Xiangwen Ren

First Institute of Oceanography

Yin Jing-wu

China University of Geosciences (Beijing)

Renjie Zhao

Kunming Medical University

Haitao Zhang

First Institute of Oceanography

Kunshan Wang

Ministry of Natural Resources

Jihua Liu

First Teaching Hospital of Tianjin University of Traditional Chinese Medicine

Yan Quanshu

First Institute of Oceanography

Cooperative Institutions

Ministry of Natural Resources

First Institute of Oceanography

Qingdao National Laboratory for Marine Science and Technology

Shandong University of Science and Technology

Laoshan Laboratory

Qingdao Institute of Marine Geology

Hohai University

Chinese Academy of Sciences

Guizhou Academy of Sciences

State Forestry and Grassland Administration

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Effects of Phosphatization on Enrichment of Cobalt in the Co-rich Fe-Mn Crusts From Seamount MP2 of the Line Islands in the Central Pacific

Haiyang kexue jinzhan (2011)

Xiangwen Ren Jihua Liu Yingchun Cui Shi Xuefa Yin Jing-wu

A Co-rich Fe-Mn crust was collected in Seamount MP2 of the Line Islands in the Central Pacific and in situ main elements of crustal layers and detrital and authigenic minerals in the crust were analyzed by means of electron microprobe along a section vertical to the layers of the crust. Based on the contents of major ore-forming metal elements, gangue elements and Si,Al,Ca and P in the detrital and authigenic minerals, the effects of phosphatization on enrichment of cobalt in the crust were studied. It has been found that Co is depleted in the non-phosphatized crustal layer (Layer Ⅱ ) , in which the Co content is equivalent to the mean Co content in the phosphatized layers. Furthermore, the Co content at some points in the phosphatized crustal layer (layer Ⅲ) varies simultaneously with P content. These data indicate that the phosphatization is not the only factor causing the Co depletion in Fe-Mn crusts.

Seamount

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Gangue

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Mineral chemistry and its genetic significance of olivine in Cenozoic basalts from the South China Sea

Yan Quanshu Shi Xuefa Kunshan Wang Bu WenRui

We dredged lots of Cenozoic basalts from areas covered from the northern sub-slope to the southern sub- slope of the South China Sea. Based on the study on mineral chemistry of clinopyroxenes in these Cenozoic hasalts, this paper indicates that pyroxenes are mostly enstatite and a few of augite, sahlite and Ca-rich pyroxene. Pyroxene microlite has higher content in, Ca, Ti and Fe than pyroxene phenocryst, it may reflect that the evolution trend of host magma of pyroxene is coincidence with that of alkali rock series. The depth of magma chambers which calculated from equilibrium temperatures and pressures between clinopyroxene and melt are as follows, that of magma of tephrite is about 49km, that of magma of trachybasalt is about 25km, and that of magma of basalt is about 15km. Correspondingly, Equilibrium temperatures( K) of three types rocks mentioned above gradually decrease from 1535 1498 to 1429 to 1369. By using discriminant plot which developed from pyroxene and alkali discriminant diagram of host rock, Cenozoic basalt from the South China Sea belongs to intraplate alkali basalt. The results suggest that alkali basalt series in the study area may be the products of continuous evolution of mantle plume, which result from some physical and chemistry process including partial melting and fractional crystallization of mantle plume during the course of its ascent to the surface.

Pyroxene

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MANTLE PLUME(HOTSPOT)-RIDGE INTERACTION

Marine Geology & Quaternary Geology (2006)

Quanshu Yan Shi Xuefa

Hotspot is a window to understand mantle plume hypothesis and dynamics of mantle plume,and the area where ridge interactions with hotspot is the best place to directly find out relationship between plate tectonics and mantle plume.Based on affirming mantle plume hypothesis,the authors introduce several 2D or 3D simulation experiments about ridge-plume(hotspot) interaction and some examples of hotspot-ridge interactions existing in the three oceans.It is further pointed out that simulation experiments combined with geology,petrology,geochemistry and geophysics(especially for high resolution seismic technique) in studying mantle(hotspot)-ridge interaction will play an important role in such reseaches as plume-ridge interactions.

Hotspot (geology)

Mantle plume

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Chemical composition of sediments from the upper plate at the southern Central American subduction zone and its geological significance

Acta Petrologica Sinica (2021)

Renjie Zhao Quanshu Yan Haitao Zhang Yili Guan Shi Xuefa

在剥蚀型汇聚板块边缘，俯冲输入板块剥蚀上覆板块并将剥蚀物质带入俯冲隧道，随后，这些剥蚀物质与俯冲板块物质一同参与了俯冲带浅部与深部地幔的地球化学循环。构造地质学和地球物理研究显示中美洲俯冲带南段是典型的俯冲剥蚀型汇聚板块边缘，这为研究上覆板块俯冲剥蚀物质是否参与俯冲带物质循环过程提供了天然的实验室。由于目前仍然缺乏对该俯冲剥蚀机制的地球化学制约，综合大洋钻探计划（IODP）344航次对中美洲俯冲带南部哥斯达黎加西部的俯冲板块和上覆板块开展了钻探工作，并获取了系统的岩芯样品。本文对IODP344航次取自上覆板块中陆坡和上陆坡的U1380和U1413站位中沉积物中的粗碎屑层位样品，开展了系统的主、微量元素与Sr-Nd-Pb-Hf同位素地球化学研究。这些沉积物粗碎屑层位组分与加勒比大火成岩省基底相似，指示它们可能来自加勒比大火成岩省基底在弧前出露的区域，可以代表上覆板块基底被俯冲剥蚀的物质组成。研究进一步探讨了晚中新世中美洲俯冲带南部大陆弧火山岩的成因，并指出上覆板块底部被剥蚀物质参与了中美洲俯冲带南部大陆弧火山岩岩浆过程，这为中美洲俯冲带南部存在俯冲剥蚀过程提供了直接的地质学证据。

10.18654/1000-0569/2021.07.01

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