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Microearthquake reveals the lithospheric structure at midocean ridges and oceanic transform faults

Journal of Oceanology and Limnology 2024年第3期42卷 697-700页

作者： Zhiteng YU Jiabiao LI Weiwei DING Key Laboratory of Submarine Geosciences&Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China

Mid-ocean ridge and oceanic transforms are among the most prominent features on the seafloor surface and are crucial for understanding seafloor spreading and plate tectonic dynamics,but the deep structure of the oceanic lithosphere remains poorly *** large number of microearthquakes occurring along ridges and transforms provide valuable information for gaining an indepth view of the underlying detailed seismic structures,contributing to understanding geodynamic processes within the oceanic *** studies have indicated that the maximum depth of microseismicity is controlled by the 600-℃***,this perspective is being challenged due to increasing observations of deep earthquakes that far exceed this suggested isotherm along mid-ocean ridges and oceanic transform *** mechanisms have been proposed to explain these deep events,and we suggest that local geodynamic processes(e.g.,magma supply,mylonite shear zone,longlived faults,hydrothermal vents,etc.)likely play a more important role than previously thought.

关键词： microearthquake mid-ocean ridge oceanic transform fault oceanic lithosphere thermal structure earthquake location

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Cretaceous Meteorite Impact-Induced Initial Subduction:Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites

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Journal of Earth Science 2022年第6期33卷 1526-1534页

作者： Benxun Su Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China

Compiled global ophiolite data reveal that Cretaceous ophiolites exhibit broaden variations in 187Re/188Os and ^(187)Os/^(188)Os values,increases in Re concentrations and thus Re/Os ratios in all peridotites and chromitites,and additional increased PPGE/IPGE(Pd-subgroup platinum-group element(PGE)/Ir-subgroup PGE)ratios in chromitites and dunites relative to pre-Cretaceous *** compositional changes in Cretaceous ophiolites,which mostly formed in subduction initiation settings,cannot be attributed solely to involvement of subducting or previously subducted crustal ***,the author proposes a Cretaceous meteorite impact model that led to impact-induced disruption of oceanic lithosphere,asthenosphere upwelling,subduction initiation at edges of laterally spreading ***-pressure and high-temperature conditions during the impacts caused melting of the meteorites and the ambient crustal and mantle rocks,producing hybrid melts containing partially un-melted *** materials contributed to the elevated ^(187)Os/^(188)Os values,Re and Re/Os ratios,whereas the undifferentiated meteorite accounted for the increases in the PPGE/IPGE and decreased ^(187)Os/^(188)Os *** pressure and super-reduced phases were likely generated by this process and were subsequently transported into the newly formed mantle peridotites and chromitites of future *** remaining meteoritic and lithospheric fragments most likely sank deeper and were distributed widely in the convecting mantle to produce the observed global compositional heterogeneities.

关键词： Re-Os isotopes ophiolites PGE meteorites subduction initiation oceanic lithosphere

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Will Earth's next supercontinent assemble through the closure of the Pacific Ocean?

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National Science Review 2022年第12期9卷 73-81页

作者： Chuan Huang Zheng-Xiang Li Nan Zhang Earth Dynamics Research Group The Institute for Geoscience Research(TIGeR) School of Earth and Planetary Sciences Curtin University Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking University

Earth’s known super continents are believed to have formed in vastly different ways,with two endmembers being introversion and *** former involves the closure of the internal oceans formed during the break-up of the previous supercontinent,whereas the latter involves the closure of the previous external super ***,it is unclear what caused such diverging behavior of supercontinent cycles that involved first-order interaction between subducting tectonic plates and the *** we address this question through 4D geo dynamic modeling using realistic tectonic *** results show that the strength of the oceanic lithosphere plays a critical role in determining the assembly path of a *** found that high oceanic lithospheric strength leads to introversion assembly,whereas lower strength leads to extroversion assembly.A theoretically estimated reduction in oceanic crustal thickness,and thus its strength,during Earth’s secular cooling indicates that introversion was only possible for the Precambrian time when the oceanic lithosphere was stronger,thus predicting the assembling of the next supercontinent Amasia through the closure of the Pacific Ocean instead of the Indian-Atlantic *** work provides a new understanding of the secular evolution of plate tectonics and geodynamics as the Earth cooled.

关键词： yield stress oceanic lithosphere introversion extroversion supercontinent cycle

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Evolution of a Carbonate-Platform-Complex in Response to Plate-Tectonic Forcing （Jurassic, Western Neotethys, Evvoia, Greece）

Evolution of a Carbonate-Platform-Complex in Response to Pla...

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第八届国际侏罗系大会

作者： R.Scherreiks D.Bosence M.Boudagher-Fadel G.Meléndez P.O.Baumgartner Retired Deputy Director Geologische Staatssammlung University of Munich Luisenstr.37 Munich D-80333 Germany Department of Earth Sciences Royal Holloway University of London Egham TW20 0EX UK Earth Sciences University College London Gower Street London WC1E6BT UK Dpto.Geologia (Paleontologia) Univ.of Zaragoza Zaragoza E-50009 Spain Institut de Géologie et Paléontologie Université de Lausanne Anthopole Lausanne CH-1015 Switzerland

＜正＞The tectono-sedimentary interplay between ancient carbonate platforms and ocean basins is not always recognisable as the oceans involved are only rarely

关键词： Carbonate platforms oceanic lithosphere Plate collision Obduction

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