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A stress-rifting origin of Grand Canyon

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Science Bulletin 2016年第6期61卷 495-504页

作者： Chunan Tang Chunyan Bao sanzhong li Kaiwen Xia Dalian University of Technology Dalian 116024 China Shaoxing University Shaoxing 312000 China Ocean University of China Qingdao 266100 China University of Toronto Toronto ON M5S 1A1 Canada

The Grand Canyon is a massive rift in the Colorado Plateau. How and when it developed has been debated for nearly 150 years. Most geologists believe the unusual landscape was primarily shaped by water *** we propose a stress-rifting model to provide an alternative explanation for the origin of Grand *** paper adopts a brittle–ductile double layer model to simulate the deformation and rifting of the plateau due to the mantle-melting-induced expansion. Our results show that the uplift induced by thermal expansion and its associated horizontal extension can cause open fractures that extend from the brittle surface to the underlying ductile layer in a top-down way. In addition, we find that episodic uplift can deepen and connect multiple fractures together to form a larger fracture network. Our findings suggest that the formation of the Grand Canyon might have been driven by plateau uplift and its associated rifting under crustal extension, wherein water erosion played only a minor role in shaping the course of the Colorado River. The new paradigm provides simpler explanations to some of the long-standing geological mysteries surrounding the canyon.

关键词： Uplift Rift Water erosion Thermal expansion Canyon

Geometries and mechanism of folds in sediments on the southern Huanghai Sea shelf

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Acta Oceanologica Sinica 2006年第4期25卷 23-31页

作者： li Xishuang liU Baohua ZHAO Yuexia li sanzhong Earth Science College Ocean University of China Qingdao 266003 China Key Laboratory of Marine Sedimentology ＆ Environmental Geology of State Oceanic Administration Qingdao 266061 China First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

Most descriptions and studies about folds have been associated with consolidated strata; fold deformation in loosely-consolidated sediments, however, has been rarely discussed. Since the Pleistocene, tectonic activities have been intensive over the South Huanghai Sea （SHS） shelf, resulting in fold deformation features that are preserved in thick sediment layers. Four types of folds with different geometries have been identified on the basis of an analysis of single - channel seismic profiles from the SHS shelf region：（1） fault-propagation fold; （2） fault-drag fold; （3） transversal bending fold; and （4） multi-action-folding fold. Studies on the geometry and mechanism of the folds indicate that base faults and fault blocks control the folding patterns in loosely-consoli- dated sediments on the SHS shelf and a large quantity of pore water in sediments plays an important role in cansing the deformation of sediment layers. The continuity of deformations of fault-propagation fold and fault-drag fold indicates that there is a genetic relationship between these fold types. The potential of earthquakes induced by fault-propagation folding in the deformation zone should be taken into account in the assessment of the marine engineering geology conditions of the SHS shelf.

关键词： fold loosely-consolidated sediment base fault marine engineering south Huanghai Sea shelf

West Pacific and North Indian Ocean Seafloor and Their Ocean-Continent Connection Zones: Evolution and Debates

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2283-2301页

作者： ZHANG Guowei li sanzhong GUO Anlin SUO Yanhui State Key Laboratory of Continental Dynamics/Department of Geology Northwest University Key Lab of Submarine Geosciences and Prospecting Techniques MOE College of Marine GeosciencesOcean University of China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology

The Indian Ocean and the West Pacific Ocean and their ocean-continent connection zones are the core area of ＂the Belt and Road＂. Scientific and in-depth recognition to the natural environment, disaster distribution, resources, energy potential of ＂the Belt and Road＂ development, is the cut-in point of the current Earth science community to serve urgent national needs. This paper mainly discusses the following key tectonic problems in the West Pacific and North Indian oceans and their ocean-continent connection zones （OCCZs）： 1. modern marine geodynamic problems related to the two oceans. Based on the research and development needs to the two oceans and the ocean-continent transition zones, this item includes the following questions. （1） Plate origin, growth, death and evolution in the two oceans, for example, 1） The initial origin and process of the triangle Pacific Plate including causes and difference of the Galapagos and West Shatsky microplates; 2） spatial and temporal process, present status and trends of the plates within the Paleo- or Present-day Pacific Ocean to the evolution of the East Asian Continental Domain; 3） origin and evolution of the Indian Ocean and assembly and dispersal of supercontinents. （2） Latest research progress and problems of mid-oceanic ridges： 1） the ridge-hot spot interaction and ridge accretion, how to think about the relationship between vertical accretion behavior of thousands years or tens of thousands years and lateral spreading of millions years at 0 Ma mid- oceanic ridges; 2） the difference of formation mechanisms between the back-arc basin extension and the normal mid-oceanic ridge spreading; 3） the differentials between ultra-slow Indian Ocean and the rapid Pacific spreading, whether there are active and passive spreading, and a push force in the mid-oceanic ridge; 4） mid-oceanic ridge jumping and termination： causes of the intra-oceanic plate reorganization, termination, and spatial jumps; 5） interaction of mantle plume and

关键词： the Belt and Road Indian Ocean West Pacific Ocean ocean-continent connection zone,seafloor marine geodynamics

The influence of fractionation of REE-enriched minerals on the zircon partition coefficients

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Geoscience Frontiers 2021年第3期12卷 249-258页

作者： Shihua Zhong sanzhong li Reimar Seltmann Zhiqing Lai Jie Zhou Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting TechniquesMOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266100China Center for Russian and Central EurAsian Mineral Studies Department of Earth SciencesNatural History MuseumLondon SW75BDUK

Zircon is widely used to simulate melt generation,migration and evolution within the crust and *** achievable performance of melt modelling generally depends on the availability of reliable trace element partition coefficients(D).However,a large range of D_(REE) values for zircon from natural samples and experimental studies has been reported,with values spanning up to 3 orders of ***,a gap of knowledge on this variability is *** this study we model the crystallization processes of common REE-bearing minerals from granitic melts and show that the measured zircon D_(REE) would be elevated if there is crystallization of REE-enriched minerals subsequent to ***,compared to zircon D_(REE) values measured from experimental studies,this mechanism appears to have a less significant influence on those from natural granite samples since the quantity of crystallized REE-enriched minerals is very low in natural magmatic systems and/or most of them crystallize prior to *** with recently published studies,this work supports that analysis of natural zircon/host groundmass pairs provides more robust D_(REE) values applicable to natural systems than those measured from experimental studies,which can be used to constrain the provenance of detrital zircons.

关键词： Rayleigh fractionation Partition coefficient Fractional crystallization REE Zircon

Adakitic Rocks Resulting from Partial Melting of Metabasite at High-Pressure Granulite-Facies Condition during Continental Collision

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Acta Geologica Sinica(English Edition) 2017年第3期91卷 1157-1158页

作者： YU Shengyao li sanzhong ZHANG Jianxin SUN Deyou Key Laboratory of Submarine Geosciences and Prospecting Technique MOE and College of Marine GeosciencesOcean University of China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology College of Earth Sciences Jilin University Institute of Geology Chinese Academy of Geological Sciences

Objective Previous studies on adakitic rocks with high Sr/Y and La/Yb ratios have established that such rocks may form in a variety of tectonic settings through different petrogenetic processes including：（1） partial melting of subducted young （〈25 Ma）, hot and hydrated oceanic slab; （2） partial melting of thickened lower crust; （3） assimilation and fractional crystallization processes involving basaltic magma; （4） partial melting of delaminated lower crust; and （5） partial melting of hydrous garnet peridotite. The various origins for adakites provide important constraints on crustal growth and evolution throughout the Earth＇s history.

关键词： of in on is UHP Adakitic Rocks Resulting from Partial Melting of Metabasite at High-Pressure Granulite-Facies Condition during Continental Collision from

Plate boundary processes of the Caroline Plate

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Science China Earth Sciences 2022年第8期65卷 1554-1567页

作者： Zhen ZHANG sanzhong li Guangzeng WANG Yanhui SUO Gang WANG Pengcheng WANG Key Laboratory of Tropical Marine Ecosystem and Bioresource Fourth Institute of OceanographyMinistry of Natural ResourcesBeihai536000China Key Lab of Submarine Geosciences and Prospecting Techniques MOECollege of Marine GeosciencesOcean University of ChinaQingdao266100China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting TechniquesMOE and College of Marine GeosciencesOcean University of ChinaQingdao266100China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China

The tectonic evolution of the Caroline Plate during the Oligocene to Early Miocene was mainly controlled by two *** west fulcrum at Palau Island remained fixed during 29-25 Ma as the Ayu Trough rifted and produced the abyssal hills parallel to its boundaries,and the Pacific Plate and part of the Caroline Plate subducted to the *** the northeast corner of the Caroline Plate,the east fulcrum is surrounded by a series of arc seamount *** chains resulted from the convergence between the Caroline Plate and the Pacific Plate and crustal softening of the northeastern Caroline Plate induced by the Caroline Hotspot at~25 *** softening of the crust also led to the dysfunction of the east fulcrum,and the west fulcrum migrated south,which caused dextral motion along the Ayu Rift and the development of an en echelon *** Yap Trench was a part of the spreading center in the Parece-Vela Rift at~29 ***,sinistral motion along the Parece-Vela Rift at around 20-15 Ma led to the exposure of the subducted Yap Trench and left a triangular region with distinctive geophysical characteristics in the surrounding area.

关键词： Caroline Plate Yap Trench Plate boundary Seamount chain

同方期刊数据库

Implementation of a particle-in-cell method for the energy solver in 3D spherical geodynamic modeling

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Earth and Planetary Physics 2024年第3期8卷 549-563页

作者： Hao Dong ZeBin Cao liJun liu YanChong li sanzhong li liMing Dai XinYu li Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Submarine Geosciences and Prospecting TechniquesMinistry of Education and College of Marine GeosciencesOcean University of ChinaQingdao 266100China State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China Department of Earth Science&Environmental Change University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China

The thermal evolution of the Earth’s interior and its dynamic effects are the focus of Earth ***,the commonly adopted grid-based temperature solver is usually prone to numerical oscillations,especially in the presence of sharp thermal gradients,such as when modeling subducting slabs and rising *** phenomenon prohibits the correct representation of thermal evolution and may cause incorrect implications of geodynamic *** examining several approaches for removing these numerical oscillations,we show that the Lagrangian method provides an ideal way to solve this *** this study,we propose a particle-in-cell method as a strategy for improving the solution to the energy equation and demonstrate its effectiveness in both one-dimensional and three-dimensional thermal problems,as well as in a global spherical simulation with data *** have implemented this method in the open-source finite-element code CitcomS,which features a spherical coordinate system,distributed memory parallel computing,and data assimilation algorithms.

关键词： numerical oscillation overshooting and undershooting particle-in-cell method three-dimensional spherical geodynamic modeling energy solver finite element method

linkage between reactivation of the sinistral strike-slip faults and 28 September 2018 Mw7.5 Palu earthquake, Indonesia

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Science Bulletin 2018年第24期63卷 1635-1640页

作者： Gege Hui sanzhong li Pengcheng Wang Yanhui Suo Qian Wang Ian D.Somerville Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationCollege of Marine GeosciencesOcean University of China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology College of Oceanography Hohai University School of Earth Sciences University College Dublin

On September 28, 2018, a Mw7.5 earthquake occurred near Sulawesi, Indonesia as a result of strike-slip faulting at shallow depth within the interior of the Molucca Sea Microplate that forms a part of the broader Sunda Plate. Focal mechanism solutions and distribution for the earthquakes indicate rupture occurred on a left-lateral NNW-SSE-to N-S-striking fault. This region has been characterized by complex tectonics in which motions of numerous small microplates are accommodating large-scale convergence between the Australia, Sunda, Pacific and Philippine Sea plates. In this paper, the Coulomb stress calculation verified the WNW-, nearly E-W-trending sinistral strike slip receiver fault in Sulawesi, which is consistent with the giant sinisterly strike-slip fault system across New Guinea, Pacific Tectonic System and the Tethys Tectonic System caused by the oblique convergence. The result has been reconciled within the modern GPS velocity field.

关键词： Palu earthquake Fault reactivation Microplate convergence Sinistral stress-field

Tectonomicrobiology:A new paradigm for geobiological research

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Science China Earth Sciences 2018年第4期61卷 494-498页

作者： Chuanlun ZHANG Jian liN sanzhong li Hailiang DONG Fengping WANG Shucheng XIE Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Woods Hole Oceanographic Institution Woods HoleMassachusetts 02543USA Institute of Marine Geodynamics Ocean University of ChinaQingdao 266100China State Key Laboratory of Biogeology and Environmental Geology China University ofGeosciencesBeijing 430074China Department of Geology and Environmental Earth Science Miami UniversityOxfordOhio 45056USA State Key Laboratory of Microbial Metabolism and State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Geomicrobiology is a sub-discipline of geobiology and emphasizes the interaction between microorganisms and their environment on Earth. There is a need to explicitly emphasize the biogeochemical processes performed by microorganisms associated with Earth's tectonic activities, especially under the framework of the modern theory of plate tectonics. Tectonomicrobiology aims to create a better synergy between microbial and active tectonic processes. This explicit synergy should also foster better communications between solid Earth scientists and life scientists in terms of holistic Earth system dynamics at both tectonic and micro-scales.

关键词： Geobiology Geomicrobiology Tectonomicrobiology Tectonic activities Microbial evolution