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EVIDENCE OF ISOTOPIC SYSTEMATICS FROM CRUST AND MANTLE FOR CHEMICAL HETEROGENEITIES OF terranes

Chinese Science Bulletin 1991年第15期36卷 1279-1282页

作者：朱炳泉 Branch of Institute of Geochemistry Academia Sinica Guangzhou 510640 PRC

The extensive tracing of Nd, Sr and Pb isotopes has revealed that there exist high-degree heterogeneities in suboceanic mantle and mantle anomalies of the Southern Hemisphere on a large scale (DUPAL, high 87Sr/86Sr, and HIMU, high μ value, i. e. 238 U/204pb). Recently, the isotopic tracing of the Cenozoic Volcanics from the continent of China has confirmed that there exists a general tendency that the subcontinental mantle of eastern China was en-

关键词： chemical heterogeneities of terranes multi dimension space of isotopic systematics crust-mantle evolution.

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KINEMATIC FEATURES OF TECTONIC DEFORMATION OF terranes IN THE XIZANG (TIBETAN) TETHYAN BELT

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地震地质 1992年第3期 204-214页

作者： Shen Xianjie(Institute of Geology,Academia Sinica,Beijing 100029)

From the point of view of plate kinematics a unified convergence velocity model is employed to derive a series of kinematic equations for deformation of Himalaya and Lhasa-Gangdise terranes during the Himalayan *** equations describe terrane shortening,crust-upper mantle thickening,lateral strike-slip movement,plateau surface uplift,erosion planation and isostatic height of the crust,*** kinematic equations for terrane deformation derived on the basis of mass conservation define the macroscopic trends of tectonic evolution of 2-D deformation of the Himalaya Terrane and 3 D deformation of the Lhasa-Gangdise Terrane during the 40Ma of the Indian-Eurasian convergence-collision on the one hand,and provide the systematically defined initial and boundary conditions for further study on the process of tectono-thermal evolution of the deformed terranes on the other hand.

关键词： Tethyan Belt terranes Tectonic deformation Plate kinematics Mass conservation Xizang

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Are the Chinese Altai “terranes” the result of juxtaposition of different crustal levels during Late Devonian and Permian orogenesis?

Are the Chinese Altai “terranes” the result of juxtapositi...

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2020年中国地球科学联合学术年会

作者： Arnaud Broussolle Min Sun Karel Schulmann Alexandra Guy Carmen Aguilar Pavla ?típská Yingde Jiang Yang Yu Wenjiao Xiao Guangzhou Institute of Geochemistry The University of Hong Kong Université de Strasbourg Czech Geological Survey State Key laboratory of Lithospheric Evolution

The general structure of the Chinese Altai has been commonly regarded as being formed by five tectono-stratigraphic ‘terranes’ separated by large-scale strike-slip ***,extensivestudyofthedetritalzirconofthePaleozoicvolcano-sedimentary sequences shown that the variably metamorphosed Cambro-Ordovician sequence, known as the Habahe Group, is present at least in four ‘terranes’.

关键词： the result of juxtaposition of different crustal levels during Late Devonian and Permian orogenesis Are the Chinese Altai terranes

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The westward lithospheric drift,its role on the subduction and transform zones surrounding Americas:Andean to cordilleran orogenic types cyclicity

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Geoscience Frontiers 2020年第4期11卷 1219-1229页

作者： Eugenio Aragon Fernando D'Eramo Marco Cuffaro Carlo Doglioni Eleonora Ficini Lucio Pinotti Silvina Nacif Manuel Demartis Irene Hernando Tomas Fuentes Centro de Investigaciones Geologicas Universidad Nacional de La PlataArgentina Instituto de Ciencias de La Tierra Biodiversidad y Ambiente(ICBIA).Departamento de GeologíaUniversidad Nacional de Río Cuarto(UNRC-CONICET)Ruta 36 Km 601Río CuartoCordobaArgentina Istituto Geologia Ambientale e Geoingegneria-CNR Italy Dipartimento de Scienzedella Terra Universita La SapienzaItaly Instituto Geofísico Sismologico F.Volponi Universidad Nacional de San JuanArgentina

We investigate the effect of the westerly rotation of the lithosphere on the active margins that surround the Americas and find good correlations between the inferred easterly-directed mantle counterflow and the main structural grain and kinematics of the Andes and Sandwich arc *** the Andes,the subduction zone is shallow and with low dip,because the mantle flow sustains the slab;the subduction hinge converges relative to the upper plate and generates an uplifting doubly verging *** Sandwich Arc is generated by a westerly-directed SAM(South American) plate subduction where the eastward mantle flow is steepening and retreating the subduction *** this context,the slab hinge is retreating relative to the upper plate,generating the backarc basin and a low bathymetry single-verging accretionary *** Central America,the Caribbean plate presents a more complex scenario:(a) To the East,the Antilles Arc is generated by westerly directed subduction of the SAM plate,where the eastward mantle flow is steepening and retreating the subduction zone.(b) To the West,the Middle America Trench and Arc are generated by the easterly-directed subduction of the Cocos plate,where the shallow subduction caused by eastward mantle flow in its northern segment gradually steepens to the southern segment as it is infered by the preexisting westerly-directed subduction of the Caribbean *** the frame of the westerly lithospheric flow,the subduction of a divergent active ridge plays the role of introducing a change in the oceanic/continental plate’s convergence angle,such as in NAM(North American)plate with the collision with the Pacific/Farallon active ridge in the Neogene(Cordilleran orogenic type scenario).The easterly mantle drift sustains strong plate coupling along NAM,showing at Juan de Fuca easterly subducting microplate that the subduction hinge advances relative to the upper *** lower/upper plate convergence coupling also applies along strike to the neigh

关键词： Lithospheric drift Converging hinge Diverging hinge Slab rollbakc terranes

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