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Subaqueous volcanism in the Paleo-Pacific Ocean based on Jurassic basaltic tuff and pillow basalt in the raohe complex,NE China

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Science China Earth Sciences 2018年第8期61卷 1042-1056页

作者： SUN MingDao XU YiGang CHEN HanLin State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Earth Science College Zhejiang University Hangzhou 310027 China

On-land records of subaqueous explosive volcanic eruptions are rarely *** understand this phenomenon and discuss its global significance,we studied the geochronology and geochemistry of basaltic tuff and pillow basalt in the raohe complex,NE *** basaltic tuff consists of well-sorted vitreous,crystal(mostly clinopyroxene),and minor lithic *** is characterized by a high Mg O(15.7–15.9%)content and zero Eu anomalies(Eu/Eu~*=99–102).The tuff erupted at 172±1 Ma based on SHRIMP zircon U-Pb dating,coeval with the previously reported age of the pillow *** pillow basalt has intermediate Mg O content and weakly negative Eu anomalies(Eu/Eu~*=90–99).Based on immobile trace element discrimination,the basaltic tuff and pillow basalt belong to alkali basalt displaying an OIB-type trace element pattern,and consistent Nd isotope signatures ofε_(Nd)(t)=4.4–6.2,indicating an identical mantle *** pillow basalt has coupled Sr-Nd isotopic values,whereas the basaltic tuff has significantly higher initial^(87)Sr/^(86)Sr values that are similar to synchronous *** indicates that the elemental exchange between the mantle-derived material and seawater most likely occurred in a subaqueous explosive volcanic eruption,rather than in an effusive *** calculations suggest that the high efficiency of the Sr-isotope exchange between seawater and the mantle-derived material triggered by a subaqueous explosive volcanic eruption is likely one of the main reasons for the rapid decrease of the global seawater^(87)Sr/^(86)Sr value.

关键词： raohe complex Subaqueous volcanism Jurassic Paleo-Pacific Ocean Seawater Sr isotope

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Late Paleozoic–Mesozoic subduction and accretion of the Paleo-Pacific Plate: Insights from ophiolitic rocks in the Wandashan accretionary complex, NE China

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Geoscience Frontiers 2021年第6期12卷 171-191页

作者： Yong Liang Han Zheng Huan Li Thomas J.Algeo Xiao-Meng Sun School of Geosciences and Info-Physics Central South UniversityChangsha 410083China State Key Laboratory of Biogeology and Environment Geology School of Earth SciencesChina University of GeosciencesWuhan 430074China State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China Department of Geology University of CincinnatiCincinnatiOH 42221-0013USA College of Earth Sciences Jilin UniversityChangchun 130061China

The Wandashan accretionary complex(AC),consisting of the raohe and Yuejinshan complexes,is located on the continental margin of Northeast Asia and represents an excellent source of information about Paleo-Pacific subduction and ***,the protolith nature and tectonic evolution of the Wandashan AC are under *** contribution reports new geochronological,geochemical,and Sr-Nd-Pb-Hf isotopic data for ophiolitic rocks from the Wandashan *** 169–166 Ma plagioclasites and homogeneous gabbros from the raohe complex are OIBs while 228–214 Ma homogeneous gabbros are continental *** gabbros from the Yuejinshan complex formed at 280–278 Ma and~220 Ma and have similar characteristics with E-MORB and N-MORB,*** are BABBs and their primary magma was derived from a source region between EMI and EMII that was affected by continental crustal contamination as well as subduction-zone *** with previous studies,we suggest that the onset of subduction of the Paleo-Pacific Plate was in the Early ***,a back-arc basin,whose present suture is on the eastern margin of the Jiamusi Massif,formed and widened during 280–232 Ma,after which the basin closed and BABBs were emplaced to form the Yuejinshan complex during 210–180 *** formation of VABs of the raohe complex is coincident with the closure of the back-arc basin,and together with the 169–166 Ma OIBs,they constitute a major part of the raohe *** accretionary process was completed during 133–131 *** together,the ophiolitic rocks indicating multistage magmatism in the Paleo-Wandashan region recorded the formation-closure process of back-arc basin and the accretionary process of the Wandashan AC,during the westward subduction of the Paleo-Pacific *** back-arc basin identified in our study sheds new lights on geodynamic evolution model of subduction and accretion of the Paleo-Pacific Plate on the continental margin of NE Asia.

关键词： Ophiolite Magma chemistry Tectonic evolution Back-arc basin raohe complex Yuejinshan complex

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