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Influence of permeability on hydrothermal circulation in the sediment-buried oceanic crust

Science china Earth Sciences 2006年第7期49卷 773-784页

作者： wang xingtao1,2. zhai shikui1, MENG Fanshun1,{2., yu zenghui1, sun ge1 & xue gang1 1 marine geoscience institute, ocean university of china, qingdao 2.6003, china 2.Bureau of ocean and Fishery, Weihai 2.42.0, china 1. marine geoscience {2. Ocean University of China Qingdao 266003 China 2. Bureau of ocean and Fishery Weihai 264200 China

Hydrothermal convection in the upper oceanic crust has been inferred to be a common and important process. Under the simplified conditions of planar boundaries, permeability provides a strong constraint on the pattern of circulation, the dimensions of convective cells and flow field of hydrothermal circulation. By applying an advanced numerical modeling method, to our knowledge, it is the first time to investigate convection as it is influenced by different strata permeability structures, formational anisotropy, fracture zone and cooling intrusion. The simplified geological model is com-posed of 3 layers, sedimentary layer, high permeable basement layer and low permeable basement layer from top to bottom. When permeability in high permeable layer is 10 times larger than that in sedimentary layer, convection occurs in high permeable layer. The pattern of hydrothermal circulation and flow velocity of hydrothermal fluid are strongly influenced by strata permeability structures, changes of permeability in high permeable basement layer, fracture zone and cooling intrusion. However, formational anisotropy relatively exerts weak influence on hydrothermal circulation, with the ratio up to 1.5 of vertical permeability to lateral permeability in high permeable layer. Fracture zone existing in basement is the most important factor affecting the circulation field. The effects of a local intrusion are limited to convection intensity above the intrusion and have little impact on the fluid flow on a regional scale. As the result of numerical modelling, key factors affecting the hydrothermal cir-culation are good permeable zone and long-term heat source, not including fluid source.

关键词： hydrothermal circulation, permeability, oceanic crust, numerical model.

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Coupled Fe–S isotope composition of sulfide chimneys dominated by temperature heterogeneity in seafloor hydrothermal systems

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Science Bulletin 2020年第20期65卷 1767-1774,M0004页

作者： Shujie wang Weidong sun Jing Huang {2. {2. huaiming li Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for ocean Mega-Science Chinese Academy of SciencesQingdao 266071China university of Chinese Academy of Sciences Beijing 100049China Key Lab of Submarine geosciences and Prospecting Techniques Ministry of EducationCollege of Marine GeosciencesOcean University of ChinaQingdao 26610OChina Key Laboratory of Submarine geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

Seafloor hydrothermal chimneys are significant metal resources and have fundamental effects on marine chemistry *** studies on growth of the chimneys focused on mineral composition and elemental distribution in chimney walls,but the isotopic composition of different elements and their correlations remain poorly ***,we report lateral Fe and S isotopes from sulfides across a chimney wall in detail from the Deyin-1 hydrothermal field(DHF) on the South Mid-Atlantic *** was characterized by increases in both δ34S and δ56Fe from the exterior to the interior within the chimney wall,which is likely related to enhanced S and Fe isotope fractionation between pyrite and fluids derived from the temperature ***,δ56Fe displayed a well-defined,linear,positive correlation with δ34S in pyrite from the DHF as well as in pyrite from other areas.A model of hydrothermal pyrite formation suggests that,under conditions with uniform hydrothermal fluid,different temperatures and similar pyrite-fluid exchange degrees could result in the observed linear relationships between δ34S and δ*** regular and coupled Fe-S isotope variations within the chimney wall efficiently constrain the process of hydrothermal sulfide formation.

关键词： Sulfide chimney Iron isotope Sulfur isotope Temperature

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