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Interactions between hotspots and the Southwest Indian Ridge during the last 90 Ma:Implications on the formation of oceanic plateaus and intra-plate seamounts

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Science china Earth sciences 2011年第8期54卷 1177-1188页

作者： zhang tao 1,2.3,4,{2.,4 1 institute of geodesy and geophysics,Chinese academy of sciences,wuhan 430077,china 2.Graduate University of Chinese academy of sciences,Beijing 100049,china 3 The Second institute of Oceanography,State Oceanic Administrator,Hangzhou 310012.china 4 Key Laboratory of Submarine Geosciences,State Oceanic Administrator,Hangzhou 310012.china 5 Department of Geology and geophysics,Woods Hole Oceanographic Institution,Woods Hole,MA 02.43,USA 1. institute of geodesy and {2. Chinese Academy of Sciences Wuhan 430077 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. The Second Institute of Oceanography State Oceanic Administrator Hangzhou 310012 China4. Key Laboratory of Submarine Geosciences State Oceanic Administrator Hangzhou 310012 China

This study investigates the relationship between the hotspot-ridge interaction and the formation of oceanic plateaus and seamounts in the Southwest Indian *** first calculated the relative distance between the Southwest Indian Ridge (SWIR) and relevant hotspots on the basis of models of plate reconstruction,and then calculated the corresponding excess magmatic anomalies of the hotspots on the basis of residual bathymetry and Airy *** results reveal that the activities of the Marion hotspot can be divided into three main phases:interaction with the paleo-Rodrigues triple junction (73.6-68.5 Ma),interaction with the SWIR (68.5-42.7 Ma),and intra-plate volcanism (42.7-0 Ma).These three phases correspond to the formation of the eastern,central,and western parts of the Del Cano Rise,*** magnitude and apparent periodicity of the magmatic volume flux of the Marion hotspot appear to be dominated by the hotspot-ridge *** periodicity of the Marion hotspot is about 2. Ma,which is much longer than that of the Hawaii and Iceland hotspots (about 15 Ma).

关键词： Southwest Indian Ocean hotspot-ridge interaction magmatic volume flux oceanic plateaus seamounts

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Magmatism and tectonic processes in Area A hydrothermal vent on the Southwest Indian Ridge

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Science china Earth sciences 2013年第12期56卷 2186-2197页

作者： zhang tao {2. jian gao jinyao Second institute of Oceanography State Oceanic Administration Key Laboratory of Submarine Geosciences State Oceanic Administration Department of Geology and geophysics Woods Hole Oceanographic InstitutionWoods HoleMA 02543USA

The hydrothermal vent in Area A （37.78°S, 49.65°E） is the first active hydrothermal vent discovered on the Southwest Indian Ridge （SWlR）. Heat source and adequate bulk permeability are two necessary factors for the formation of a hydrothermal vent. Along the SWIR 49.3°E to 51.2.E, the gravity-derived crustal thickness is up to 9.0 km, much thicker than the average thick- ness of the global oceanic crust. This characteristic indicates that the magma supply in this area is robust, which is possibly af- fected by a hotspot. The large-scale residual mantle Bouguer anomalies （RMBA） reveal prominent negative-gravity anomalies between the first-order ridge segment （from Indomed to Gallieni, 46.0°E to 52.0°E） and the Marion-Del Cano-Crozet region. These anomalies indicate the channel of the hotspot-ridge interaction. The tomography data corrected with theoretical thermal model indicate that the low-velocity anomalies corresponding to this channel can reach the base of the lithosphere. Near the hydrothermal vent area, the topography and crustal thickness at the off-axis area are extremely asymmetrical. South of the SWIR, the high topography corresponds to the thinning crustal thickness. The residual isostatic topography anomalies indicate that Area A is a deviation from the local isostatic equilibrium, similar to the characteristics of the transform fault inside corner. The forward profiles of the magnetic data indicate that the thinning magnetic layer at the south side of Area A corresponds to the shallow, high-velocity area revealed by the OBS, which is the result of tectonic extension of a detachment fault. The active tectonic processes in Area A can provide sufficient crustal permeability to the hydrothermal circulation and may form massive sulfide deposits.

关键词： ultra-slow spreading ridge Area A hydrothermal vent RMBA hotspot-ridge interaction detachment fault

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Formation mechanism,experimental method,and property characterization of graindisplacing methane hydrates in marine sediment:A review

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china Geology 2022年第2期5卷 345-354页

作者： Yong-chao zhang Le-le Liu gao-wei Hu Qing-{2. Bu Cheng-feng Li Zheng-cai zhang jian-ye Sun Chang-ling Liu The Key Laboratory of Gas Hydrate Qingdao Institute of Marine GeologyChina Geological SurveyMinistry of Natural ResourcesQingdao 266237China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

Grain-displacing hydrate deposits exist at many marine sites,which constitute an important part of methane hydrate resources *** to the difficulties in acquiring field data and synthesizing experimental samples,the formation and property characterization of grain-displacing hydrate remains less understood and characterized than the pore-filling hydrate in current *** study reviews the formation mechanisms of grain-displacing hydrate from the perspective of geological accumulation and microscale sedimentary *** experimental methods of synthesizing grain-displacing hydrate in the laboratory and the current knowledge on the property of grain-displacing hydrate sediment are also *** in current theories and suggestions for future study are *** work is hoped to provide valuable insights for the research into the hydrate accumulation,geophysics,and hydrate exploitation targeted at the grain-displacing hydrate in the marine sediments.

关键词： Methane hydrates Formation mechanism Grain-displacing hydrate Pore-filling hydrate Synthesis method Sedimentary property Oil and gas exploration engineering NGHs exploration trial engineering

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时间域激电测深在坦桑尼亚金矿床勘查中的应用例析

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地球物理学进展 2019年第2期34卷 588-595页

作者：李水平司建涛程华毛金彪曹杰孙进张勇高福利河南省地质矿产勘查开发局第二地质矿产调查院郑州450001

铁建造(BIF)型金矿和构造蚀变岩型金矿是坦桑尼亚绿岩带中主要金矿床类型,应用时间域激电测深获得了这两种类型金矿床内、由探测目标体和目的物引起的良好异常,了解了它们在地下半空间内的电性分布特征;依据激电测深显示的"低阻高极化"... 详细信息

铁建造(BIF)型金矿和构造蚀变岩型金矿是坦桑尼亚绿岩带中主要金矿床类型,应用时间域激电测深获得了这两种类型金矿床内、由探测目标体和目的物引起的良好异常,了解了它们在地下半空间内的电性分布特征;依据激电测深显示的"低阻高极化"断面异常对含矿标志层(条带状含铁建造)、含矿构造(蚀变带)和金矿(化)体进行空间定位,为钻探工程布置、进而发现隐伏-半隐伏金矿床提供了充分依据.以坦桑尼亚绿岩带内近几年发现的典型金矿床为实例,分析时间域激电测深在这两种类型金矿床中的应用效果,以期为成矿地质条件类似地区通过激电测深手段寻找金矿产提供借鉴.

关键词：时间域激电测深绿岩带金矿床坦桑尼亚

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鄂尔多斯盆地差异抬升对长7页岩孔隙的影响——以东南部甘泉地区和南部渭北隆起地区为例

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天然气地球科学 2018年第5期29卷 597-605页

作者：王香增张丽霞姜呈馥尹锦涛高潮孙建博尹娜薛莲花陕西延长石油(集团)有限责任公司陕西西安710075 陕西省页岩气勘探开发工程技术研究中心/陕西省陆相页岩气成藏与开发重点实验室陕西西安710075 陕西延长石油(集团)有限责任公司研究院陕西西安710075 甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室甘肃兰州730000 中国科学院大学北京100049

为对比研究差异抬升对鄂尔多斯盆地延长组长7页岩孔隙的影响,分别选取了甘泉地区G12.井和渭北隆起YW1井(浅地表)2.埋深相差较大的长7~3典型页岩样品,通过脉冲衰减渗透率测量、覆压孔隙度测量、氮气吸附实验及氩离子抛光—扫描电镜成像... 详细信息

为对比研究差异抬升对鄂尔多斯盆地延长组长7页岩孔隙的影响,分别选取了甘泉地区G12.井和渭北隆起YW1井(浅地表)2.埋深相差较大的长7~3典型页岩样品,通过脉冲衰减渗透率测量、覆压孔隙度测量、氮气吸附实验及氩离子抛光—扫描电镜成像分析等方法对样品孔隙特征进行表征。结果表明:页岩储层孔隙均主要为纳米级,孔隙类型主要有粒间孔、粒内孔、微裂缝及少量有机质孔。其中,G12.井有机质孔较发育,主要由于该区页岩所达最大埋深较深,样品热演化程度较高;而YW1井页岩裂缝较发育,这与盆地南部经历了强烈的构造抬升运动有关,致使YW1井页岩样品渗透率(1.13~4.2.)×10^(-3)μm^2.遍高于G12.井渗透率(0.013 5~0.663 0)×10^(-3)μm^2.2.页岩中小于10nm微孔和中孔提供了主要的比表面积,大于10nm的中孔和大孔对孔隙体积贡献较大,其中G12.井页岩平均孔径及孔径峰值均较YW1井页岩小,这与其埋深较深导致压实作用更强有关。

关键词：页岩差异抬升孔隙特征低温氮气吸附鄂尔多斯盆地

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