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Destruction of the Northern Margin of the North China Craton in Mid-Late Triassic: Evidence from asthenosphere-derived Mafic Enclaves in the Jiefangyingzi Granitic Pluton from the Chifeng Area, Southern Inner Mongolia

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Acta Geologica Sinica(English Edition) 2020年第4期94卷 1071-1092页

作者： LIU Jianfeng LI Jinyi CHI Xiaoguo ZHENG Peixi HU Zhaochu ZHANG Xiaowei Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Land and ResourcesChangchun 130061China College of Earth Science Jilin UniversityChangchun 130061China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China

The petrology, geochronology and geochemistry of the mafic enclaves in the Mid-Late Triassic Jiefangyingzi pluton from Chifeng area, southern Inner Mongolia, in China are studied to reveal their petrogenetic relationship with the host pluton. Furthermore, the coeval magmatic assemblage and its petrogenesis on the northern margin of the North China craton(NCC) are studied synthetically to elucidate their tectonic setting and the implications for the destruction of the NCC. Zircon U-Pb dating reveals that the mafic enclaves formed at 230.4 ± 2.2 Ma, which is similar to the age of the host pluton. The most basic mafic enclaves belong to weak alkaline rocks, and they display rare earth element(REE) and trace element normalized patterns and trace element compositions similar to those of ocean island basalt(OIB). In addition, they have positive εNd(t) values(+3.84 to +4.94) similar to those of the Cenozoic basalts on the northern margin of the NCC. All of these geochemical characteristics suggest that the basic mafic rocks originated from the asthenosphere. Petrological and geochemical studies suggest that the Jiefangyingzi pluton and the intermediate mafic enclaves were formed by the mixing of the asthenosphere-derived and crust-derived magmas in different degrees. The Mid-Late Triassic magmatic rocks on the northern margin of the NCC could be classified into three assemblages according to their geochemical compositions: alkaline series, weak alkaline–sub-alkaline series and sub-alkaline series rocks. Petrogenetic analyses suggest that the upwelling of the asthenosphere played an important role in the formation of these Mid-Late Triassic magmatic rocks. Basing on an analysis of regional geological data, we suggest that the northern margin of the NCC underwent destruction due to the upwelling of the asthenosphere during the Mid-Late Triassic, which was induced by the delamination of the root of the collisional orogeny between Sino-Korean and Siberian paleoplates in Late P

关键词： mafic enclave craton destruction asthenosphere Mid-Late Triassic North China craton

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Extension of orogenic belts and upwelling of asthenosphere:the example of Hinggan-Mongolian orogenic belt

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Chinese Science Bulletin 1995年第1期40卷 50-56页

作者：邵济安臧绍先牟保磊李晓波王冰 Institute of Sciences and Technologies Peking University Beijing 100871 China Department of Geophysics Peking University Beijing 100871 China Department of Geology Peking University Beijing 100871 China Institute of Geologic Information Beijing 100037 China Petroleum Exploration and Development Company Beijing 100083 China

There were mighty advances in continental lithosphere study last decade. It is recognized that asthenosphere, which is marked by low-velocity seismic wave, is not only unlike that of ocean in continuity and uniformity, but also not suitable to continent as the concept of mechanical decoupling zone. The depth and reflection characters of the top of asthenosphere vary in different regions within a continent. Instead of the passive response to plate divergence, asthenosphere plays a very active role in continental dynamics,

关键词： Hinggan-Mongolian orogenic belt upweiling of asthenosphere extension.

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The application of a gravimetric forward modelling of the lithospheric structure for an estimate of the average density of the upper asthenosphere

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Geodesy and Geodynamics 2019年第4期10卷 265-275页

作者： Wenjin Chen Robert Tenzer School of Geomatics Science and Technology Nanjing Tech UniversityNanjingChina Department of Land Surveying and Geo-Informatics Hong Kong Polytechnic UniversityHong KongChina

The average density of 3300 kg m-3 is often attributed for the asthenosphere. In this study, we inspect this value by estimating the average value of the(upper) asthenosphere based on applying the gravimetric forward modelling of major known lithospheric density structures. The LITHO1.0 global seismic model of the lithospheric density structure is used for this purpose, while considering that the lithosphere-asthenosphere boundary(LAB) is rheological, conventionally taken at the 1300C isotherm,above which the mantle behaves in a rigid fashion and below which it behaves in a ductile *** to our result, the average density of the upper asthenosphere is roughly 3400 kg m-3. This density value closely agrees with the corresponding average value 3371 kg m-3 computed based on an empirical density model provided in the Preliminary Reference Earth Model(PREM), while using the LITHO1.0 LAB depth data. We also demonstrate that the sub-lithospheric mantle gravity map exhibits mainly a thermal signature. The most prominent features in this gravity map are mid-oceanic spearing ridges marked by gravity lows, while oceanic subductions in the West Pacific are characterized by the most pronounced gravity highs.

关键词： asthenosphere Density Forward modelling Gravity Lithosphere

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asthenosphere-lithospheric mantle interaction in an extensional regime:implication from the geochemistry of Cenozoic basalts from Taihang Mountains,North China Craton

Asthenosphere-lithospheric mantle interaction in an extensio...

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中国科学院地质与地球物理研究所2006学术年会

作者： Yan-Jie Tang,Hong-Fu Zhang,Ji-Feng Ying State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,P.R.China

Compositions of Cenozoic basalts from the Fansi(26.3-24.3 Ma),Xiyang-Pingding (7.9-7.3 Ma) and Zuoquan(～5.6 Ma) volcanic fields in the Taihang Mountains provide insight into the nature of their mantle sources and evidence for asthenosphere-lithospheric mantle interaction beneath the North China *** basalts are mainly alkaline(SiO2=44-50 wt.%, Na2O+K2O=3.9-6.0 wt.%) and have OIB-like characteristics,as shown in trace element distribution patterns,incompatible elemental(Ba/Nb=6-22,La/Nb=0.5-1.0,Ce/Pb= 15-30, Nb/U=29-50) and isotopic ratios(87Sr/86Sr=0.7038-0.7054,143Nd/144Nd=0 5124-0.5129). Based on TiO2 contents,the Fansi lavas can be classified into two groups:high-Ti and low-Ti. The Fansi high-Ti and Xiyang-Pingding basalts were dominantly derived from an asthenospheric source,while the Zuoquan and Fansi low-Ti basalts show isotopic imprints(higher 87Sr/86Sr and lower 143Nd/144Nd ratios) compatible with some contributions of sub-continental lithospheric *** variation in geochemical compositions of these basalts resulted from the low-degree partial melting of asthenosphere and the interaction of asthenosphere-derived magma with old heterogeneous lithospheric mantle in an extensional regime,possibly related to the far effect of the India-Eurasia collision.

关键词： Cenozoic basalt Geochemistry asthenosphere Lithospheric mantle Extensional regime North China Craton

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Relation Between the asthenosphere Thickness Distribution Characteristics and Tectogenesis of the Northeastern Margin of Sino-Korean Platform and Its Neighboring Area

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Earthquake Research in China 2000年第3期14卷 20-29页

作者： Jiang Delu Bai Yun Lu Zaoxun Niu Yan Seismological Bureau of Liaoning Province Shenyang 110031 China Civil Engineering College of Shenyang City Shenyang 110031 China

Based on the results of multiple geophysical research methods,the lithosphere thicknessisolines of the northeastern margin of Sino-Korean platform and its neighboring area havebeen compiled and the geotectonic significance and the geodynamic characteristics of depthdistribution of asthenosphere roof have been also *** authors proposed that closerrelation exists between the depth of asthenosphere roof and the tectonic activity as well as themodern faulting and seismic activity from Meso-Cenozoic Era till *** upper mantleasthenosphere is generally uplift in Hailar basin,Bohal Bay-Xia Liaohe basin andSonghuajiang-Liaohe ***,there exists modern seismic activity and groundsubsidence in this *** is result from the uplift of upper mantle asthenosphere.

关键词： Upper mantle asthenosphere Lithosphere Gradient belt Dynamical parameter

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The westward drift of the lithosphere:A tidal ratchet?

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Geoscience Frontiers 2018年第2期9卷 403-414页

作者： A.Carcaterra C.Doglioni Dipartimento di Ingegneria Meccanica e Aerospaziale Sapienza UniversityRomeItaly Istituto Nazionale di Geofisica e Vulcanologia RomeItaly Dipartimento di Scienze della Terra Sapienza UniversityRomeItaly

Is the westerly rotation of the lithosphere an ephemeral accidental recent phenomenon or is it a stable process of Earth's geodynamics? The reason why the tidal drag has been questioned as the mechanism determining the lithospheric shift relative to the underlying mantle is the apparent too high viscosity of the asthenosphere. However, plate boundaries asymmetries are a robust indication of the 'westerly'decoupling of the entire Earth's outer lithospheric shell and new studies support lower viscosities in the low-velocity layer(LVZ) atop the asthenosphere. Since the solid Earth tide oscillation is longer in one side relative to the other due to the contemporaneous Moon's revolution, we demonstrate that a non-linear rheological behavior is expected in the lithosphere mantle interplay. This may provide a sort of ratchet favoring lowering of the LVZ viscosity under shear, allowing decoupling in the LVZ and triggering the westerly motion of the lithosphere relative to the mantle.

关键词： Westward drift of the lithosphere Tectonic equator Low-velocity layer asthenosphere viscosity Non-linear rheology Tidal ratchet

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Melt-Lithosphere Interaction Controlled Compositional Variations in Mafic Dikes from Fujian Province,Southeastern China

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Journal of Earth Science 2021年第6期32卷 1445-1453页

作者： Zhuliang Lei Gang Zeng Jianqiang Liu Xiaojun Wang Lihui Chen Xiaoyu Zhang Jinhua Shi State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjing210023China Institute of Marine Geology College of OceanographyHohai UniversityNanjing210098China

Late Mesozoic magmatism in southeastern China has been widely considered to be related to the subduction of the Paleo-Pacific ***,it remains controversial whether mafic rocks are derived from the lithosphere or the *** we present a comprehensive study on mafic dikes from Fujian Province in southeastern China,aiming to understand their *** types of mafic rocks have been recognized based on their trace-element ***-Ⅰrocks show arc-like trace-elemental characteristics,while type-Ⅱrocks are distinguished by their relatively flat patterns in primitive-mantle-normalized trace-element *** such differences between two types of rocks,these mafic dikes show two trends in the plots of^(87)Sr/^(86)Sr(i)versus La/Nb,which can be explained by the influences of crustal contamination and melt-lithospheric mantle interaction,respectively.^(87)Sr/^(86)Sr(i),La/Nb,Sr/Y and Zr/Y ratios of type-I rocks are significantly correlated to the thickness of the underlying lithosphere,and the signals of lithosphere are clearer with increasing lithospheric *** highlights the important influences of melt-lithosphere interaction during their *** observations also indicate that these mafic rocks are more likely to have been originated from the asthenosphere rather than the lithospheric mantle.

关键词： mafic dike lithospheric mantle asthenosphere melt-lithosphere interaction southeastern China

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Study on lithogeochemistry of Middle Jurassic basalts from southern China represented by the Fankeng basalts from Yongding of Fujian Province

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Science China Earth Sciences 2006年第10期49卷 1020-1031页

作者： ZHOU Jincheng1,2, JIANG Shaoyong1,2, WANG Xiaolei1,2, YANG Jinghong 1,2 & ZHANG Mengqun 3 1. State Key Laboratory of Mineral Deposit Research, Nanjing University, Nanjing 210093, China 2. Department of Earth Sciences, Nanjing University, Nanjing 210093, China 3. Modern Analysis Center, Nanjing University, Nanjing 210093, China State Key Laboratory of Mineral Deposit Research Nanjing University Nanjing China Department of Earth Sciences Nanjing University Nanjing China Modern Analysis Center Nanjing University Nanjing China

There exists an E-W trending Middle Jurassic volcanic zone in southern China. The Fankeng basalts in the Yongding basin of Fujian Province are considered to be a typical example. The Fankeng basalts have TiO2 contents in the range of 1.92%-3.21%. They are classified as high-Ti basalts. They also have higher total Fe (averaging FeO* = 11.09%). The Middle Jurassic Fankeng basalts from southwestern Fujian have obvious distinctive lithogeochemical features from early Cre- taceous basalts from southeastern coast of China. They have higher HFSE, such as Th, Nb, Ta, Zr and Ti. Their element ratios related with HFSE, such as Zr/Ba, La/Nb, La/Ta ,Zr/Y, Ti/Y, Ba/Nb, K/Ti and Rb/Zr are similar to those of OIB. The most samples have ε Nd(T) of-0.70-0.24, which are near chondrite. Some samples have higher ε Nd(T) of ***, these basaltic magmas might be derived from depleted asthenospheric mantle. The lithogeochemical characteristics of the Fankeng basalts may be caused by interaction between asthenosphere and lithosphere at the time. The (Early-) Middle Jurassic basalts and gabbros from southeastern Hunan, southern Jiangxi and northern Guangdong provinces show similar geochemical features to those of the Fankeng basalts from the Yongding of Fujian. Occurrence of these OIB-type basalts in the area may be regarded as the petrological mark of upwelling of asthenosphere at the time. Upwelling of asthenosphere has led to tectonic extension and the formation of rifted basin in the area.

关键词： interaction between asthenosphere and lithosphere, lithogeochemistry, basalts, Middle Jurassic, southern China.

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Carboniferous Post-collisional Rift Volcanism of the Tianshan Mountains, Northwestern China

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Acta Geologica Sinica(English Edition) 2003年第3期77卷 338-360页

作者： XIA Linqi, XU Xueyi, XIA Zuchun, LI Xiangmin, MA Zhongping and WANG Lishe Xi’an Institute of Geology and Mineral Resources, China Geological Survey, Xi’an, Shaanxi 710054 E-mail: geologyx@***. Liu Shuchun and Liu Xinzhu Xian Inst Geol & Mineral Resources China Geol Surv Xian 710054 Shaanxi Peoples R China

The Tianshan Carboniferous post-collisional rift volcanic rocks occur in northwestern China as a large igneous province. Based on petrogeochemical data, the Tianshan Carboniferous post-collisional rift basic lavas can be classified into two major magma types: (1) the low-Ti/Y type situated in the eastern-central Tianshan area, which exhibits low Ti/Y (500), Ce/Yb (>11) and SiO2 (49-55%), and relatively low Fe2O3T (5.8-7.8%). Elemental data suggest that chemical variations of the low-Ti/Y and high-Ti/Y lavas cannot be explained by fractional crystallization from a common parental magma. The Tianshan Carboniferous basic lavas originated most likely from an OIB-like asthenospheric mantle source (87Sr/86Sr(t) ≈ 0.703-0.705, eNd(0 = +4 to +7). The crustal contamination and continental lithospheric mantle have also contributed significantly to the formation of the basic lavas of the Tianshan Carboniferous post-collisional rift. The silicic lavas were probably generated by partial melting of the crust. The data of this study show that spatial petrogeochemical variations exist in the Carboniferous post-collisional rift volcanics province in the Tianshan region. Occurrence of the thickest volcanics dominated by tholeiitic lavas may imply that the center of the mantle-melting anomaly (mantle plume) was in the eastern Tianshan area at that time. The basic volcanic magmas in the eastern Tianshan area were generated by a relatively high degree of partial melting of the mantle source around the spinel-garnet transition zone, whereas the alkaline basaltic lavas are of the dominant magma type in the western Tianshan area, which were generated by a low degree of partial melting of the mantle source within the stable garnet region, thus the basic lavas of the western Tianshan area might have resulted from relatively thick li

关键词： Carboniferous post-collisional rift volcanics geochemistry petrogenesis asthenosphere lithosphere Tianshan Mountains NW China

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On Geophysical Background of Superlarge Deposits in the Chinese Continent

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Acta Geologica Sinica(English Edition) 1999年第2期73卷 193-200页

作者： PENG Cong PEI Rongfu GAO Rui Institute of Mineral deposits CAGS Beijing 100037 Institute of Geology CAGS Beijing 100037

Based on the study of tens of geophysical profiles (seismic, geothermal flow and magnetotelluric sounding profiles) and 3-D shear wave velocity structures of the Chinese continent and its neighbouring regions, this paper describes the 3-D crustal and upper mantle structures and discusses briefly the deep geophysical background of superlarge ore deposits in the Chinese continent. Superlarge deposits are usually very few in number, but they are distributed still in certain forms such as “point”, “zone” and “area”. Most of the large-, medium- and small-sized deposits occur near the margins of different tectonic units; while the superlarge endogenic polymetallic deposits occur mostly in thinned mantle lithosphere, uplifts of the asthenosphere (vertical low-velocity zones) and the transformation zones of lateral inhomogeneity (weak zones) in the upper mantle. The superlarge endogenic polymetallic deposits are almost unevenly distributed in three major ore zones in China, corresponding to the boundaries of inhomogeneous regions in the asthenosphere.

关键词： Chinese continent superlarge deposits mantle lithosphere asthenosphere

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