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Petrology,Metamorphic P-T Paths and Zircon U-Pb Ages for Paleoproterozoic Mafic Granulites from Xuanhua,North China craton

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Journal of Earth Science 2019年第6期30卷 1197-1214页

作者： Guidong Wei Fanmei Kong Hao Liu Xiaoman Wang Yancheng Zhang Xiaohan Liu Shandong Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and Technology

The studied mafic granulites are located at Xiwangshan,Xuanhua region in the north of the Trans-North China Orogen(TNCO),occurring as lens within tonalite-trondhjemite-granodiorite(TTG)gneisses in the eastern part of the Xiwangshan *** rocks contain the representative granulite-facies minerals such as garnet,clinopyroxene,orthopyroxene,plagioclase,amphibolite,rutile and quartz,and also well-developed melt pseudomorph and *** the prograde metamorphic stage(M1)cannot be retrieved due to rare preservation of pre-peak-stage mineral associations,three distinct mineral assemblages that formed in different metamorphic stages can be identified,based on petrography and mineralogy *** peak stage(M2)is characterized by Grt2+Cpx2+Amp2+Pl2+Rt+melt pseudomorphs,and a post-peak decompression stage(M3)contains a mineral assemblage of Grt3+Opx3+Cpx3+Amp3+Pl3,while a later-retrogression stage(M4)is featured by coronas of Amp4+Pl4 surrounding *** calculating metamorphic P-T conditions using THERMOCALC,stage M2 was constrained to be 13.2–14.8 kbar and 1050–1080℃,and M3 recorded P-T conditions of 5.7–7.3 kbar and 825–875℃,while M4 yielded P of^5 kbar and T of^660℃,consistent with amphibolite facies *** into account of all these petrological data,we propose that the mafic granulite experienced a high-pressure(HP)and ultra-high temperature(UHT)granulite-facies metamorphism during the peak metamorphism,which was accompanied with a clockwise P-T path.U-Pb dating of metamorphic zircons in the granulites yields two groups of ages at 1853±14 and 1744±44 Ma,*** suggest that the older age corresponded to the HP-UHT metamorphism,while the younger age represented an retrograde metamorphic event during cooling.

关键词： ultrahigh-temperature metamorphism phase equilibrium modeling mafic granulite Trans-North China Orogen North China craton

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Edge-driven convection and thinning of craton lithosphere:Two-dimensional thermal-mechanical modeling

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Science China Earth Sciences 2019年第12期62卷 2106-2120页

作者： Danhong LIU Lin CHEN State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

There are usually abrupt changes in lithospheric thickness at the boundaries between ancient cratons and adjacent young mobile *** variations in temperature and density between the two can trigger small-scale mantle convection(edge-driven convection,EDC).Here,we use two-dimensional thermal-mechanical simulations to explore the EDC caused by the lithospheric step between a craton and a mobile belt,and its role in the thinning of the craton *** results show that the impact of EDC on a craton depends on the properties of the craton lithosphere and on their contrasts with the adjacent mobile belt,given the same initial *** the craton lithospheric density is relatively large,a high-strength craton has strong ability to resist EDC,and craton lithospheric thinning is limited to the *** contrast,the ability of a low-strength craton to resist EDC is weak,and the craton lithosphere is gradually eroded by the downward flow,eventually leading to large-scale thinning of the cratonic *** the craton lithospheric density is relatively small,regardless of the strength of the cratonic lithosphere,the craton can well withstand the impacts of *** this case,upwelling flow drives cratonic lithosphere materials to the base of the mobile belt,and lithospheric thinning only occurs at the edge of the craton *** Archean North China craton(NCC)was surrounded by Phanerozoic mobile belts,and its lithospheric thinning first occurred on the northern and eastern margins,a process that lasted for a long *** suggest that EDC has played an important role in lithospheric thinning of the NCC,in particular the initiation of lithospheric thinning,but we cannot rule out the additional contributions from other mechanisms.

关键词： Edge-driven convection Lithospheric steps Lithospheric thinning Numerical modeling craton

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Metallogenic geodynamic background of Mesozoic gold deposits in granite-greenstone terrains of North China craton

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Science China Earth Sciences 1998年第2期41卷 113-120页

作者：陈衍景郭光军李欣 1. Department of Geology Peking University 100871 Beijing China

The spatial distribution map of 65 mid-large gold-deposits hosted in the granite-greenstone terrains of the North China craton is first drawn. These gold deposits mainly concentrate in the Mesozoic remobilized Yinshan-Yanshan-Liaoning-Jilin intracontinental collisional orogenic belt, the northern Qinling and the Jiaodong Mesozoic collisional orogenic belts, and the Mesozoic intracontinental fault-magmatic belts developed along the Taihangshan and the Tan-Lu faults; their mineralizing time is predominantly Jurassic-Cretaceous, i.e. the Yanshanian. The metallogenic geodynamic background is exactly the compression-to-extension transition regime during continental collision.

关键词： North China craton gold deposit granite-greenstone terrain collision orogenesis Mesozoic.

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Detrital Zircon U–Pb Geochronology and Provenance of Bayan Obo Group, Northern Margin of North China craton: New Implications for the Position of NCC in Rodinia

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Acta Geologica Sinica(English Edition) 2019年第5期93卷 1397-1416页

作者： LI Changhai LIU Zhenghong XU Zhongyuan DONG Xiaojie LI Pengchuan SHI Qiang WANG Shijie College of Earth Sciences Jilin UniversityChangchun 130001China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130026China

The paleoposition of North China craton in Rodinia has long been in controversial. This paper mainly focuses on the U-Pb geochronological studies of detrital zircons obtained from Bayan Obo Group exposed in the Shangdu area, Inner Mongolia, aiming to provide more information for interprating this problem. Based on the acquired data, this paper comes to the following conclusions. Firstly, the depositional age of Bayan Obo Group might be from Meso- to Neoproterozoic according to the zircons U-Pb dating results. The lower succession of this group, namely Dulahala and Jianshan formations deposited between 1800 and 1650 Ma. The Halahuogete and Bilute formations deposited between 1500 and 1350 Ma. For Baiyinbaolage and Hujiertu formations, their depositional age was 1250-900 Ma. Secondly, for the provenance of Bayan Obo Group, this paper believes detrital zircons with age of 2.51-2.71 Ga and 2.00-2.48 Ga were from Guyang, Xi Ulanbulang and Zhuozi area;the Khondalite Belt provided detrital zircons with age of 1.95-1.80 Ga;zircons with age of 1.60-1.75 Ga might come from granitic rocks in Miyun Area. The magmatism after 1.60 Ga was rarely recorded in the NCC, therefore those zircons with ages younger than 1.60 Ga might come from outside of NCC. The magmatism with the same age existed in Baltic, Amazonia and Laurentia. Based on previous paleomagnetic researches, this paper proposes that NCC might receive detritus from Baltic during 1560-1350 Ma and had affinity with Laurentia and Amazonia at ~0.9 Ga in Rodinia. Baltic, Amazonia and Laurentia might be potential provenances for non-NCC detritus in Bayan Obo Group.

关键词： North China craton Precambria Bayan Obo Group detrital zircons Rodinia

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Apatite fission track and (U-Th)/He thermochronology from the Archean Tanzania craton: Contributions to cooling histories of Tanzanian basement rocks

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Geoscience Frontiers 2017年第5期8卷 999-1007页

作者： Charles H. Kasanzu Department of Geology University of Dar es Salaam P.O.Box 35052 Dar es Salaam Tanzania

Borehole and surface samples from the Archean Tanzania craton were analysed for apatite fission track(AFT) and(U-Th)/He data with the aim of deciphering cooling histories of the basement rocks. Fission track dates from borehole and outcrop samples are Carboniferous-Permian(345± 33.3 Ma to271±31.7 Ma) whereas(U-Th)/He dates are Carboniferous-Triassic(336±45.8 Ma to 213±29 Ma) for outcrop grains and are consistently younger than corresponding AFT dates. Single grain(U-Th)/He dates from the borehole are likely to be flawed by excessive helium implantation due to their very low effective uranium contents, radiation damage and grain sizes. All AFT and(U-Th)/He dates are significantly younger than the stratigraphic ages of their host rocks, implying that the samples have experienced Phanerozoic elevated paleo-temperatures. Considerations of the data indicate removal of up to 9 km overburden since the *** modelling reveals a protracted rapid cooling event commencing during the early Carboniferous(ca. 350 Ma) at rates of 46 m/Ma ending in the Triassic(ca. 220 Ma). The model also suggests minor cooling during the Cretaceous of the samples to surface temperatures. The suggested later cooling event remains to be tested. The major cooling phase during the Carboniferous is interpreted to be associated with compressional tectonics during the Variscan Orogeny sensu far field induced stresses. Coeval sedimentation in the Karoo basins in the region suggests that most of the cooling of cratonic rocks during the Carboniferous was associated with denudation.

关键词： Thermochronology Exhumation Tanzania craton

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Discovery of the Early Mesozoic granulite xenoliths in North China craton

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Science China Earth Sciences 2000年第S1期43卷 245-252页

作者：邵济安韩庆军李惠民 Department of Geology Peking University Beijing 100871 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Tianjin Institute of Geology and Minerals Resources Tianjin 300170 China

The discovery of the Early Mesozoic basic granulite xenoliths in the Harqin area of the Inner Mongolia Autonomous Region (for short Inner Mongolia) is reported for the first time in this paper. According to the mineral assemblage the xenoliths include two-pyroxene granulite, clinopyroxene granulite, and hypersthene granulite. Their protolytes are mainly gabbroite rocks. The zircon U-Pb age of the granulite xenoliths is 251 Ma, and K-Ar age of the hypersthene is 229 Ma. They represent the times of metamorphism and cooling of the granulite facies respectively. The host rock of the xenoliths is Early Mesozoic biotite-quartz diorites, whose whole-rock K-Ar age is 219 Ma. This discovery confirms existence of an Early Mesozoic underplating in the North China craton, which is of much importance in research on the Early Mesozoic mantle-crust interaction in the concerned area.

关键词： North China craton Early Mesozoic granulite xenolith and lower crust.

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Genetic causes of oil-rich and oil-poor reservoirs: Implications from two Cenozoic basins in the eastern North China craton

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Science China Earth Sciences 2018年第12期61卷 1910-1931页

作者： Chiyang LIU Lei HUANG Dongdong ZHANG Junfeng ZHAO Yu DENG Pei GUO Yijian HUANG &Jianqiang WANG State Key Laboratory of Continental Dynamics &Institute of Oil and Gas Basin Northwest UniversityXi'an 710069China

The Bohai Bay and Hehuai(southern North China) rift basins in the eastern part of the North China craton are southnorth-adjacent. They have shown synchronous evolutionary processes, and possess generally identical superficial and shallow structural characteristics as well as similar basin areas. However, there is a large difference in the richness of oil resources between the two basins. The Bohai Bay Basin has extremely abundant oil reserves, while commercial oil reserves have not been found in the Hehuai Basin. The deep tectonic structures, magmatic activities, and modern and paleo-geothermal fields of the two basins are significantly different. Compared with the Hehuai Basin, the Bohai Bay Basin has a thinner crust and more complex structure with multiple low-velocity layers. It is also characterized by intense magmatic activity, high modern and paleogeothermal fields, frequent seismic activity, and active deep interactions, small effective elastic thickness of the isotropic lithosphere, and shorter balanced transformation wavelength of the lithosphere with a high likelihood of local compensation. The Hehuai Basin has a simple deep structure and homogeneous crustal composition, with a high likelihood of regional compensation. The characteristics of the deep structures mentioned above are generally similar to those of the southern part of the stable Ordos Basin, except for the smaller crust thickness. This indicates the presence of differences in Mesozoic destruction between the southern and northern zones in the eastern part of the North China craton. The northern zone was subjected to significant destruction, while the southern zone was subjected to modifications, primarily in the form of local changes in the structures and/or properties of the crust or lithospheric mantle, with the overall structure and stability of the craton kept intact. The formation of high-quality source rock is primarily influenced by the abnormal flourishment of organisms in water bodies

关键词： Genetic causes of oil-rich and oil-poor reservoirs Bohai Bay Basin Hehuai Basin Destruction of North China craton Deep processes High-quality source rock formation

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Material records for Mesozoic destruction of the North China craton by subduction of the Paleo-Pacific slab

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Science China Earth Sciences 2020年第5期63卷 690-700页

作者： Yazhou FENG Jinhui YANG Jinfeng SUN Jiheng ZHANG State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China

It is well known that the destruction of the North China Carton(NCC)is closely related to subduction of the Paleo-Pacific slab,but materials recording such subduction has not been identified at the peak time of *** paper presents data of whole-rock major and trace elements and Sr-Nd-Hf isotopes and zircon U-Pb ages and Hf-O isotopes for Mesozoic volcanic rocks from the Liaodong-Jinan region in the northeastern NCC,in order to trace the subduction-related materials in their source and *** Mesozoic volcanic rocks in the Liaodong-Jinan region are mainly composed of two series of rocks,including alkaline basaltic trachyandesite,trachyandesite and trachyte,and subalkaline trachyandesite and *** U-Pb dating yields eruption ages of 129–124 Ma for these *** Early Cretaceous volcanic rocks are all enriched in LILEs(such as Rb,Sr,Ba and Th)and LREEs,depleted in HFSEs(such as Nb,Ta and Ti),indicating that they were originated from mantle sources that had been modified by subducted crustal ***,they have relatively heterogeneous and variable isotopic *** alkaline basaltic trachyandesite,trachyandesite and trachyte have enriched whole-rock Sr-Nd-Hf and zircon Hf isotopic compositions and mantle-likeδ18O values,suggesting that they were derived from low-degree partial melting of an isotopically enriched lithospheric mantle *** contrast,the subalkaline trachyandesite and andesite have relatively depleted isotopic compositions with zirconεHf(t)values up to+5.2 and heavy zircon O isotopic compositions with δ18O values of+8.1‰to+9.0‰,indicating that they were originated from a lithospheric mantle source that had been metasomatized by melts/fluids derived from the recycled low-T altered oceanic *** of these geochemical features suggest that the Early Cretaceous volcanic rocks in the Liaodong-Jinan region would result from mixing of mafic magmas with different *** magmas were originated from

关键词： North China craton Early Cretaceous volcanic rocks Zircon Hf-O isotopes Subduction of the Paleo-Pacific slab

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Meso-Cenozoic lithospheric thermal structure in the Bohai Bay Basin,eastern North China craton

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Geoscience Frontiers 2017年第5期8卷 977-987页

作者： Zongxing Li Yinhui Zuo Nansheng Qiu Jun Gao The Key Laboratory of Shale Oil and Gas Geological Survey Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Chengdu 610059 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Beijing Key Laboratory of Water Resources and Environment and Engineering Chinese University of Geosciences Beijing 100083 China

The Bohai Bay Basin is a region where part of the North China craton has been thinned and destroyed. It has experienced two periods of crustal thinning that occurred during the Cretaceous and Paleogene, but investigations of its Mesozoic and Cenozoic lithospheric thermal structure are limited. Therefore, in this study,the distributions of mantle heat flow, crustal heat flow, and Moho temperatures during the Meso-Cenozoic are calculated based on analyses of the thermal history of the Bohai Bay Basin. The results indicate that the ratio of mantle heat flow to surface heat flow peaked during the late stages of the early Cretaceous and during the middle to late Paleogene. The corresponding mantle heat flow was more than 65% of the surface heat flow. Moho temperatures reached three peaks: 900-1100℃ in the late stages of the early Cretaceous;820-900℃ in the middle to late Paleogene; and(in the Linqing Depression, Cangxian Uplift, and Jizhong Depression) 770-810℃ during the early Neogene. These results reveal that the Bohai Bay Basin experienced significant geological change during the Cretaceous, including the transformation of lithospheric thermal structure from "cold mantle and hot crust" before the Cretaceous to "hot mantle and cold crust" after the Cretaceous. The results also indicate that the basin experienced two large-scale rifting ***, this work may provide the thermal parameters for further investigations of the geodynamic evolution of eastern China.

关键词： Bohai Bay Basin Lithospheric thermal structure Mesozoic Moho temperature North China craton

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Ultrahigh Temperature Metamorphic Record of Pelitic Granulites in the Huangtuyao Area of the Huai’an Complex,North China craton

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Journal of Earth Science 2019年第6期30卷 1178-1196页

作者： Shaoting Ma Xu-Ping Li Hao Liu Fanmei Kong Han Wang Shandong Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and Technology

Pelitic granulite from the Huangtuyao area,occurrs in the Huai'an Complex,is located in the Trans-North China Orogen of the North China *** the basis of petrolography,mineral component,and phase equilibrium modeling studies,the P-T conditions and mineral assemblages of pelitic granulites can be divided into four metamorphic stages:the prograde metamorphic stage M1 defined by the stable mineral assemblage of Grt1(garnet core)+Pl+Bt+Kfs+Qz+Rt,the peak pressure Pmax stage M2 indicated by Grt2(garnet mantle)+Kfs±(Ky)+Rt+Qz+Liq(melt),peak temperature Tmax stage M3 characterized by Grt3(garnet rim)+Sill+Pl+Kfs+Qz+Ilm+Liq,and retrograde stage M4 represented by Grt(in matrix)+Kfs+Sill+Bt+Pl+Qz+*** using the THERMOCALC V340,the P-T conditions are estimated at^13.8–14.1 kbar and^840–850℃at stage M2,and 7–7.2 kbar and 909–915℃for the Tmax stage M3,indicating an ultra-high temperature(UHT)metamorphic overprinting during decompression and heating process after high pressure granulite facies *** mineral assemblages and their P-T conditions presented a clockwise P-T trajectory for the Huangtuyao pelitic *** major metamorphic events at^1.95 and^1.88 Ga obtained by the zircon U-Pb dating suggest that pelitic granulites from the Huangtuyao area has undergone HP granulite metamorphism which probably occurred in the prograde metamorphism and related to the collision between the Ordos and the Yinshan blocks,and afterwards UHT metamorphism is related to crustal extension after continental-continental collision.

关键词： pelitic granulite UHT metamorphism Huai'an Complex North China craton phase equilibrium modeling zircon U-Pb dating

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