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plate convergence in the Indo-pacific region

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Journal of Oceanology and Limnology 2020年第4期38卷 1008-1017页

作者： SUN Weidong ZHANG Lipeng LIAO Renqiang SUN Saijun LI Congying LIU He Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

The Indo-pacific convergence region is the best target to solve the teo remaining challenges of the plate tectonics theory,i.e.,subduction initiation and the driving force of plate *** studies proposed that the Izu-Bonin subduction initiation belongs to spontaneous initiation,which implies that it started from extension,followed by low angle *** geodynamic modeling suggests that the initiation of plate subduction likely occurred along a transform fault,which put the young spreading ridge in direct contact with old oceanic ***,however,does not explain the simultaneous subduction initiation in the west pacific region in the ***,the subduction initiations in the Izu-BoninMariana,the Aleutian,and the Tonga-Kermadec trenches are associated with oceanic crusts of different ages,yet they occurred at roughly the same time,suggesting that they were all triggered by a maj or change in the pacific ***,low angle subduction induces compression rather than extension,which requires external compression *** that the famous Hawaiian-Emperor bending occurred roughly at the same time with the onset of westward subductions in the west pacific,we propose that these Cenozoic subductions were initiated by the steering of the pacific plate,which are classified as induced *** subduction initiation usually occurs in young ocean basins,forming single-track *** closure s of Neo-Tethys Oceans were likely triggered by plume s in the south,forming northward ***,the Indian plate kept on moving northward more than 50 Ma after the collision between the Indian and Eurasian continents and the break-off of the subducted oceanic slab attached to *** strongly suggests that slab pull is not the main driving force of plate tectonics,whereas slab sliding is.

关键词： plate tectonics subduction initiation drifting history pacific plate Indian plate slab sliding

Petrogenesis of Jurassic Granitoids on Liaodong Peninsula,Northeast China:Constraints on the Evolution of the Mongol-Okhotsk and pacific Tectonic Regimes

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Journal of Earth Science 2021年第1期32卷 127-143页

作者： Jinyu Li Ye Qian Leontine Tekoumc Changji Zhao Jinlei Sun Tao Zheng Fengyue Sun Yanjie Shen College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Nature ResourcesChangchun 130061China Laboratory of Geology Faculty of SciencesUniversity of N'djamenaN'djamena 1027Republic of Chad

The tectonic setting of Jurassic magmatism in the Northeast China(NE China)is ***,we present new petrological,whole-rock geochemical,zircon U-Pb geochronological,and zircon Lu-Hf isotope data for Jurassic granitoids of the Wulong region,Liaodong Peninsula,NE *** ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS)zircon U-Pb data indicate that these granitoids were emplaced at 165-156 *** biotite monzogranite,two-mica monzogranite,monzogranite,granodiorite,biotite granodiorite,and syenogranite are strongly peraluminous(A/CNK=1.09-1.29),contain peraluminous minerals such as muscovite,have high normative corundum abundances(1.26 wt.%-3.28 wt.%),and have high K2_(O)/Na2O ratios(0.76-1.48),all of which indicate an S-type granite ***,the biotite granodiorite and syenogranite have high Sr(391 ppm-570 ppm)and low Y(3.06 ppm-5.94 ppm)contents,with high Sr/Y(65.8-185.9)ratios,and the two-mica monzogranite,monzogranite,and granodiorite have relatively high Sr(138 ppm-379 ppm)and low Y(3.38 ppm-8.71 ppm)contents,with high Sr/Y ratios(19.1-77.9).All of the analyzed samples have negative zircon eHf(t)values(-41.4 to-20.6)with old two-stage Hf model ages(TDM2(Hf)=2.50-3.76 Ga).Therefore,we infer that the biotite monzogranite is the typical feature of S-type granite that was derived by partial melting of *** monzogranite,two-mica monzogranite,granodiorite,biotite granodiorite,and syenogranite exhibit geochemical characteristics of S-type granite with K-rich adakitic features,and were possibly derived by mixing of melts from clastic crustal materials and ada-kitic *** are voluminous Jurassic igneous rocks in the NE *** combining our study with the previous researches,this paper infers that the Jurassic magmatism within the Erguna-Xing'an Massif was related to the southward subduction and closure of the Mongol-Okhotsk Ocean;the Early Jurassic magmatism to the east of the Songliao Basin and in the northern North

关键词： Mongol-Okhotsk Ocean pacific plate S-type granites adakites Northeast China

Seismic tomography of the northwest pacific and its geodynamic implications

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Progress in Natural Science:Materials International 2001年第1期11卷 48-51+83页

作者：邵济安刘福田陈辉 Beijing 100101 Beijing 100871 China Chinese Academy of Sciences Institute of Geology ami Geophysics Peking University

High-resolution tomographic images across Japan Trench-Changbai Mountains-Dong Ujimqinqi are displayed, showing the morphological feature of the subducted slab in the northwestern pacific margin and the characteristics of lithosphere structures under the Changbai Mountains and the Da Hinggan Mountains. The pacific plate began to penetrate into the deeper mantle after it subducted to the 660 km discontinuity with an underthoisting angle of 26°, but did not continue to move further westward. In contrast, there appeared a remarkable thermal upwelling zone to the west of the downward plate. In addition, the evidence from the subduction time and time lag between the subduction and consequent magmatism indicates that there is no direct genetic correlation between the Mesozoic magmatism in eastern China and subduction of the pacific plate. In this work, we also emphasize that what the tomographic images reflect is the present structure in the deep earth interior, which should preserve some Mesozoic lithospher

关键词： seismic tomography pacific plate subduction continental margin volcano-plutonic rock belt.

Geological and Geochemical Characteristics of Early Cretaceous Mafic Dikes in Northern Jiangxi Province, SE China and Their Geodynamic Implications

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Acta Geologica Sinica(English Edition) 2005年第2期79卷 201-210页

作者： XIEGuiqing HURuizhong MAOJingwen LIRuiling CAOJinjian JIANGGuohao QILiang InstituteofGeochemistry ChineseAcademyofSciencesGuiyangGuizhou550002 InstituteofGeochemistry ChineseAcademyofSciencesGuiyangGuizhou550002／／InstituteofMineralResourcesChineseAcademyofGeologicalSciencesBeijing100037 InstituteofMineralResources ChineseAcademyofGeologicalSciencesBeijing100037 EarthScienceDepartment SunYat-SenUniversityGuangzhouGuangdong510275

The development of Early Cretaceous mafic dikes in northern and southern Jiangxi allows an understanding of the geodynamic setting and characteristics of the mantle in southeast China in the Cretaceous. Geological and geochemical characteristics for the mafic dikes from the Wushan copper deposit and No. 640 uranium deposit are given in order to constrain the nature of source mantle, genesis and tectonic implications. According to the mineral composition, the mafic dikes in northern Jiangxi can be divided into spessartite and olive odinite types, which belong to slightly potassium-rich calc-alkaline lamprophyre characterized by enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE), large depletion in high strength field elements (HSFE) and with negative Nb, Ta and Ti anomalies, as well as 87Sr/86Sr ratios varying from 0.7055 to 0.7095 and 143Nd/144Nd ratios varying from 0.5119 to 0.5122. All features indicate that the magma responsible for the mafic dikes was derived mainly from metasomatic lithosphere mantle related to dehydration and/or upper crust melting during subduction. Differences in geochemical characteristics between the mafic dikes in northern Jiangxi and the Dajishan area, southern Jiangxi were also studied and they are attributed to differences in regional lithospheric mantle components and/or magma emplacement depth. Combining geological and geochemical characteristics with regional geological history, we argue that southeast China was dominated by an extensional tectonic setting in the Early Cretaceous, and the nature of the mantle source area was related to enrichment induced by asthenosphere upwelling and infiltration of upper crust-derived fluids responding to pacific plate subduction.

关键词： Jiangxi Province Early Cretaceous geochemical characteristics northern Jiangxi southeast China tectonic implications rare earth elements mineral composition nature of geodynamic setting tectonic setting uranium deposit copper deposit pacific plate mantle source high strength belong to in order

Late Cretaceous Transpressional Fault System: A Case Study of the Yishu Fault Belt, Shandong Province, Eastern China

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Acta Geologica Sinica(English Edition) 2015年第5期89卷 1531-1545页

作者： LI Chunlin WANG Zongxiu WU Qingzi LIU Yongqing GAO Wanli TAN Yuanlong KUANG Hongwei LI Huijun Key Laboratory of Shale Oil and Gas Geological Survey Institute of Geomechanics Chinese Academy of Geological Sciences Linshu Bureau of Land Resoures Institute of Geology Chinese Academy of Geological Sciences

On the basis of field observations of the structures of three profiles from the Linshu region, deformation characteristics and the tectonic background of the Yishu fault belt in the Late Cretaceous–Early Cenozoic have been discussed in *** structural profiles, whose deformations consist mainly of earlier transpressional faults and later normal faults, were developed for the Mengtuan Formation of the Lower Cretaceous Dasheng *** positive flower structures, duplex structures, and break-through faults were found in these *** the basis of analyses of the structural deformation and previous geochronological studies, it was concluded that the earlier transpressional faults of the profiles were triggered by the sinistral transpression of the Yishu fault belt in the Late Cretaceous–Early Paleogene, and that the later normal faults, formed during the Late Paleogene–Neogene extension, truncated the earlier transpressional *** consideration of the tectonic evolution of the Tan-Lu fault belt and the different drift directions of the pacific plate since the Cretaceous, we suggest that the major tectonic events of the Late Cretaceous–Neogene in eastern China were mainly controlled by the subduction of the pacific plate.

关键词： Late Cretaceous structural deformation transpressional fault Yishu fault belt pacific plate

plate tectonic control on the formation and tectonic migration of Cenozoic basins in northern margin of the South China Sea

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Geoscience Frontiers 2020年第4期11卷 1231-1251页

作者： Pengcheng Wang Sanzhong Li Yanhui Suo Lingli Guo Guangzeng Wang Gege Hui M.Santosh Ian D.Somerville Xianzhi Cao Yang Li Key Lab of Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266235China School of Earth Sciences and Resources China University of Geosciences(Beijing)29 Xueyuan RoadBeijing 100083China Department of Earth Sciences University of AdelaideAdelaideSA5005Australia UCD School of Earth Sciences University College DublinBelfieldDublin 4Ireland

The tectonic evolution history of the South China Sea(SCS) is important for understanding the interaction between the pacific Tectonic Domain and the Tethyan Tectonic Domain,as well as the regional tectonics and geodynamics during the multi-plate convergence in the *** Cenozoic basins formed in the northern margin of the SCS,which preserve the sedimentary tectonic records of the opening of the *** to the spatial non-uniformity among different basins,a systematic study on the various basins in the northern margin of the SCS constituting the Northern Cenozoic Basin Group(NCBG) is *** we present results from a detailed evaluation of the spatial-temporal migration of the boundary faults and primary unconformities to unravel the mechanism of formation of the *** NCBG is composed of the Beibu Gulf Basin(BBGB),Qiongdongnan Basin(QDNB),Pearl River Mouth Basin(PRMB) and Taixinan Basin(TXNB).Based on seismic profiles and gravity-magnetic anomalies,we confirm that the NE-striking onshore boundary faults propagated into the northern margin of the *** the fault slip rate,fault combination and a comparison of the unconformities in different basins,we identify NE-striking rift composed of two-stage rifting events in the NCBG:an early-stage rifting(from the Paleocene to the Early Oligocene) and a late-stage rifting(from the Late Eocene to the beginning of the Miocene).Spatially only the late-stage faults occurs in the western part of the NCBG(the BBGB,the QDNB and the western PRMB),but the early-stage rifting is distributed in the whole ***,the early-stage rifting can be subdivided into three phases which show an eastward migration,resulting in the same trend of the primary unconformities and peak faulting within the *** late-stage rifting is subdivided into two phases,which took place simultaneously in different *** first and second phase of the early-stage rifting is related to back-arc extension of the pacific su

关键词： Northern Cenozoic basin group South China Sea NE-Striking fault Tectonic migration pacific plate Tethyan tectonic domain

Plume-ridge interaction induced migration of the Hawaiian-Emperor seamounts

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Science Bulletin 2021年第16期66卷 1691-1697,M0004页

作者： Weidong Sun Charles H.Langmuir Neil MRibe Lipeng Zhang Saijun Sun He Li Congying Li Weiming Fan Paul J.Tackley Patrick Sanan Center of Deep Sea Research Center of Ocean Mega ScienceInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China School of Marine Sciences University of the Chinese Academy of SciencesBeijing 100049China Department of Earth and Planetary Sciences Harvard UniversityCambridge MA 02138USA Universite Paris-Saclay CNRSLab FASTF-91405 OrsayFrance Center for Excellence in Tibetan plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China Institute of Geophysics Department of Earth SciencesETH ZurichZurich CH-8092Switzerland

The history of the Hawaiian hotspot is of enduring interest in studies of plate motion and mantle flow,and has been investigated by many researchers using the detailed history of the Hawaiian-Emperor Seamount *** of the unexplained aspects of this history is the apparent offset of several Emperor seamounts from the Hawaii plume *** we show that the volcanic migration rates of the Emperor seamounts based on existing data are inconsistent with the drifting rate of the pacific plate,and indicate northward and then southward “absolute movements”of the *** modeling suggests that attraction and capture of the upper part of the plume by a moving spreading ridge led to variation in the location of the plume’s magmatic output at the *** of the plume material towards the ridge led to apparent southward movement of ***,the upper part of the plume was carried northward until 65 Ma *** the ridge and the plume became sufficiently separated,magmatic output moved back to be centered over the plume *** changes are apparent in variations in the volume of seamounts along the plume *** and isotopic compositions of basalt from the Emperor Seamount chain changed from depleted(strong mid-ocean ridge affinity)in Meiji and Detroit to enriched(ocean island type),supporting declining influence from the *** its surface expression was modified by mantle flow and by plume-ridge interactions,the stem of the Hawaiian plume may have been essentially stationary during the Emperor period.

关键词： pacific plate Emperor-Hawaii chain Plume-ridge interaction Geochemistry Numerical modeling

Global plate Motions and Their Impact on the Earth's Surface Area Change

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Earthquake Research in China 2010年第3期24卷 344-352页

作者： Cao Shuai Zhang Keliang Wei Dongping Laboratory of Computational Geodynamics Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Based on their Euler poles, we calculated the relative velocities between every two plates in the typical global plate motion models, respectively, and estimated the area change along these boundaries. In our calculations, plates on both sides accommodated area changes depending on the boundary types： extensional, convergent or transform, so we can estimate area change of each plate and then globally. Our preliminary results show that the area of the southern hemisphere increased while that of the northern hemisphere decreased over the past I million years, and global area has increased by 26,000km^2 to 36,000km^2, which corresponds to the 160m - 250m increment on the Earth＇s radius if all these area increments are attributed to Earth＇s expansion. Taking the NUVEL-1 model as an example, of the 14 plates in this model, 11 are decreasing, but the global area has increased because of the larger increment amount from Africa, North America and Antarctica. Finally, we also discussed factors affecting the global area change such as subduction zone retreating and back-arc spreading.

关键词： plate Motions NUVEL-1 Model pacific plate Subduction