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Late Triassic Intracontinental Deformation of South Tianshan,Central Asia:Evidence from Syn-tectonic Sedimentation and Detrital Zircon Provenances of the Kuqa Depression

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Acta Geologica Sinica(English Edition) 2024年第3期98卷 548-568页

作者： QIN Xiang CHEN Xuanhua SHAO Zhaogang ZHANG Yiping WANG Yongchao LI Bing SU He WANG Ye LIU Kui HAN Lele china aero geophysical survey and remote sensing center for Natural resources Beijing 100083China Key Laboratory of Airborne Geophysics and remote sensing Geology MNRBeijing 100083China Chinese Academy of Geological Sciences Beijing 100037China School of Earth Sciences and resources China University of Geosciences(Beijing)Beijing 100083China

The Tianshan range,a Paleozoic orogenic belt in Central Asia,has undergone multiple phases of tectonic activities characterized by the N-S compression after the early Mesozoic,including the far-field effects of the Cenozoic Indian-Asian ***,there are limited reports on the tectonic deformation and initiation of Triassic intracontinental deformation in the Tianshan *** this structural context is crucial for interpreting the early intracontinental deformation history of the Eurasian continent during the early *** strata and syn-tectonic sediments provide a rich source of information on tectonic activities and have been extensively used in the studies of orogenic *** on detail fieldwork conducted in this study,the middle-late Triassic Kelamayi Formation of the northern Kuqa Depression in the southern Tianshan fold-thrust belt has been identified as the typical syn-tectonic growth *** youngest detrital zircon component in two lithic sandstone samples from the bottom and top of the Kelamayi growth strata yielded U-Pb ages of 223.4±3.1 and 215.5±2.9 Ma,respectively,indicating that the maximum depositional age of the bottom and top of the Kelamayi growth strata is 226-220 and 218-212 *** geochronological distribution of detrital samples from the Early-Middle Triassic and Late Triassic revealed abrupt changes,suggesting a new source supply resulting from tectonic activation in the Tianshan *** coupling relationship between the syn-tectonic sedimentation of the Kelamayi Formation and the South Tianshan fold-thrust system provides robust evidence that the Triassic intracontinental deformation of the South Tianshan range began at approximately 226-220 Ma(during the Late Triassic)and ended at approximately 218-212 *** findings provide crucial constraints for understanding the intraplate deformation in the Tianshan range during the Triassic.

关键词： growth strata basin-mountain coupling Triassic Indosinian event Kuqa Depression South Tianshan

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Imaging the western boundary of the Sichuan Craton from multiple geophysical observations

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Journal of Earth Science 2024年

作者： Qihang Yin Xi Xu Xiaodong Yang Xuhua Shi Lei Wu Andrew V.Zuza Liu Yang Hefeng Tian Yuanhai Shu Shufeng Yang Nevada Bureau of Mines and Geology University of Nevada china aero geophysical survey and remote sensing center for Natural resources china Geological survey School of Earth Sciences Zhejiang University Research center for Structures in Oil and Gas Bearing Basins Ministry of Education Key Laboratory of Ocean and Marginal Sea Geology South china Sea Institute of Oceanology Innovation Academy of South china Sea Ecology and Environmental Engineering Chinese Academy of Sciences School of Mechanical and Electrical Engineering Hubei Open University

The boundary between the cratonic and orogenic lithospheres is one of the most significant seismogenic zones characterized by strong lithospheric deformation. As the essential tectonic block bounding the eastern Tibetan Plateau， the Sichuan Craton (SCC) resists the eastward escape of Plateau’s crustal materials， resulting in the uplift of the Songpan-Ganzi Block (SGB) and the crustal deformation of the Longmenshan tectonic belt (LMTB). To uncover the compressional structures and deformational mode of the LMTB and SCC， it is crucial to determine the precise location and geometry of the western boundary of the SCC. To address this issue， the lithospheric properties of the obduction SGB， the underthrusting SCC， and the LMTB were analyzed using a series of geophysical data， including seismic reflection profiles， magnetotellurics， aeromagnetics， gravity， and seismic tomography. The crust of the SGB is characterized by low magnetism， low seismic velocity， low resistivity and low Bouguer gravity， while that of the SCC features non-uniform high magnetism， high seismic velocity， high resistivity and high Bouguer gravity. The LMTB， as the boundary between the SGB and SCC， shows the geophysical characteristics similar to the SCC along the southern and central segments. The integration of all these geophysical observations suggests that the SCC’s western boundary follows the Yingxiu-Beichuan fault along the northern segment， without obvious underthrust. However， this boundary is located west of the Wenchuan-Maoxian fault zone along the southern and central segments， with distinct westward wedging/underthrusting. The irregular geometry of the SCC’s western boundary can further explain the variation in structural deformation along the LMTB. By comparing the differences in crustal thickness and lithospheric strength between the SGB and SCC， this study suggests that the varying crustal strength between tectonic blocks may be the controlling factor for the irregular geometry of the

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Tectonic boundaries in the South china Sea from aeromagnetic signature

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Journal of Oceanology and Limnology 2023年第2期41卷 550-561页

作者： Yao LUO Hang YIN Qiang LIU Jingmin LI Shihua LIU Wei GAO Rui LI Yi YANG china aero geophysical survey and remote sensing center for Natural resources Beijing 100083China

Magnetic data has been widely applied in the tectonic ***-resolution magnetic data were used to analyze the geotectonic zoning of the South china *** on the newly compilated magnetic data,the processing results and the distribution of known faults,we consider that the U-shaped line approximately along the South china Sea national boundary of china shown in the magnetic map is a significant geological and geophysical *** first described the linear characteristics of the magnetic data and then applied pseudo-gravity,Euler deconvolution,tilt derivatives,and the texture segmentation method to process the *** show that the dividing line between the South china Sea and the surrounding blocks is approximately along this U-shaped *** dividing line between the South china domain and the South china Sea domain is along with the Dongsha Islands to Xisha Trough,which is different from the previous geophysical zoning *** results are almost consistent with those of the gravity data indicating roughly the tectonic zonation along the U-shaped line.

关键词： South china Sea U-shaped line tectonic zoning aeromagnetic map texture segmentation

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Study of Residual Basin and Tectonolayering Based on Airborne Gravity and Magnetic Data

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Acta Geologica Sinica(English Edition) 2013年第4期87卷 1137-1153页

作者： LI Wenyong ZHOU Jianxin XIONG Shengqing LIU Yanxu XU Jianchun china aero geophysical survey and remote sensing center for land and resources

This paper takes the South Yellow Sea as an example to show a new method for comprehensive geological-geophysical research such as residual basin and tectonolayering using airborne gravity and magnetic data in china. Based on airborne gravity and magnetic data, by measuring and analyzing stratigraphic density and susceptibility, the depths to the pre-Sinian magnetic basement top, the pre-Jurassic top and the Cenozoic bottom, are obtained by forward and inverse methods constrained by seismic and drilling data; and furthermore, the residual thicknesses of the Sinian-Triassic, the Jurassic-Cretaceous and the Cenozoic are calculated. Based on airborne gravity and magnetic anomalies, the faults in the pre-Sinian magnetic basement, the Jurassic-Cretaceous and the Cenozoic are respectively interpreted by the qualitative and quantitative methods. On the basis of the above study, and combining regional important tectonic events, four tectonolayers are divided in the vertical succession in South Yellow Sea, namely the pre-Sinian magnetic basement, the Sinian-Triassic, the Jurassic-Cretaceous and the Cenozoic. The result shows that there are thick Cenozoic and Jurassic-Cretaceous strata and thin residual Sinian-Triassic strata in the Suzhong-Huangnan depression area, but there are thin or only sporadic Mesozoic-Cenozoic terrestrial strata and thick Sinian-Triassic marine strata reserved in Subei-Huangzhong uplift area and Sunan-Wunansha uplift area. The four tectonolayers are very different in structures as well as distributions in plane.

关键词： airborne gravity and magnetics comprehensive interpretation residual basin,tectonolayering South Yellow Sea

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Petrology, geochemistry and Ar-Ar geochronology of eclogites in Jinshajiang orogenic belt, Gonjo area, eastern Tibet and restriction on Paleo-Tethyan evolution

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china Geology 2023年第2期6卷 285-302页

作者： Yuan Tang Ya-dong Qin Xiao-dong Gong Yong Li Dong-bing Wang Bao-di Wang Chengdu center China Geological Survey(Geosciences Innovation Center of Southwest China)Ministry of Natural ResourcesChengdu 610081China china aero geophysical survey and remote sensing center for Natural resources Beijing 100083China

As one of the important Paleo-Tethys suture zones in eastern Tibet,the Jinshajiang orogenic belt is of great significance to study the tectonic evolution of the main suture zone of *** this paper,eclogites developed in the Jinshajiang suture zone in Gonjo area,eastern Tibet,are selected as specific research objects,and petrological,geochemical and Ar-Ar geochronological analyses are carried *** major element data of the whole rock reveals that the eclogite samples have the characteristics of picritic basalt-basalt and belong to the oceanic low potassium *** results of rare earth elements and trace elements of the samples show that the protoliths of eclogites have characteristics similar to oceanic island basalt(OIB)or normal mid ocean ridge basalt(N-MORB).Muscovite(phengite)from two eclogite samples yield the Ar-Ar plateau ages of 247±2 Ma and 248±2 Ma respectively,representing the peak metamorphic age of eclogite facies and the timing of complete closure of the Jinshajiang Paleo-Tethys *** and biotite selected from the hosting rocks of eclogite yield the Ar-Ar plateau ages are 238±2 Ma and 225±2 Ma respectively,reflecting the exhumation age of eclogites and their hosting *** with the zircon U-Pb dating data(244 Ma)of eclogites obtained in previous work,it can be concluded that the Jinshajiang Paleo-Tethys ocean was completely closed and arc-continent collision was initiated at about 248-244 Ma(T21).Subsequently,due to the large-scale arc(continent)-collision orogeney between Deqin-Weixi continental margin arc and Zhongza block(T31-T32),the eclogites were rapidly uplifted to the shallow crust.

关键词： Eclogite Ar-Ar geochronology Closure of Paleo-Tethys ocean Arc-continent collision Geological survey engineering Jinshajiang orogenic belt Eastern Tibet

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Distribution of wetlands and salt lakes in the Yadong region of Tibet based on remote sensing, and their geo-climatic environmental changes

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china Geology 2022年第4期5卷 637-648页

作者： Ang Sun Qing-hua Yang Zhi Liu Hua Chen Lei Han Shou-min Jiang Yue-yue Meng Yu Bian Yong-peng Yang china aero geophysical survey and remote sensing center for Natural resources China Geological SurveyBeijing 100083China Sichuan Geological survey Institute Chengdu 610036China

Based on the 16 scenes GF-1 satellite multi-spectral remote sensing images,through the adoption of data processing methods including orthorectification,geometric rectification,data fusion and image mosaic,integrated with field surveys,the remote sensing interpretation signs for the inland wetland types have been built,and the remote sensing survey of inland wetlands in Yadong region has been initiated,with six types of inland wetlands recognized in Yadong region,namely permanent rivers,seasonal rivers,lakes,salt lakes,alpine meadows,and inundated *** spatial distribution characteristics and the spreading rules of these wetlands have also been *** on full understanding of the overall characteristics of the inland wetlands in the Yadong region,using the three phases of TM images acquired in 1989,2003 and 2008 as well as the PMS2 data gathered by GF-1 in 2014,and the wide-range data(WFV3)gathered by GF-1 in *** to the typical salt lakes,a long-time salt lakes transition study was carried *** results show that the typical salt lakes in Yadong have been shrinking in the past three *** average annual shrinkage of Duoqing Co(Co means lake in Tibetan)was stronger than that of Gala Co,which are respective 87.30 hectares(usually short as ha;1 ha equals to 0.01 km^(2))/a and 24.20 ha/a;the shrinkage degree of Gala Co was higher than that of Duoqing Co,shrank by 59.27% and 35.73% *** on the remote sensing survey results and an integrated analysis of the predecessors’researchers,the reason for the shrinkage of the salt lakes is more inclined to geological *** process is manifested by a series of extensional faults at the bottom of the lake basin generated from tectonic activities,providing fluid infiltration channels,and inducing the eventual leakage of lake water to the lower *** result provides an important instance for understanding the evolution characteristics of wetlands and salt lakes in specific environ

关键词： Yadong Wetlands Salt lakes Duoqing Co Gala Co Geological survey engineering Tibet Plateau

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Effect and Prospect of Basic Geological survey Based on Airborne Gravimetry in china

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Acta Geologica Sinica(English Edition) 2012年第1期86卷 38-47页

作者： LI Wenyong ZHOU Jianxin XIONG Shengqing GUO Zhihong LU Wenfen XU Jianchun LIU Yanxu china aero geophysical survey and remote sensing center for land and resources Beijing 100083China

The airborne gravimetry was an important leap and innovation in the world＇s history of geophysical exploration. china＇s first test of the airborne gravity geological survey in the onshoreoffshore transitional area of the western and southern part of the Bohai Sea was successful and effective in geology. Based on the airborne gravity data, and combining previous ground gravity, seismic and drilling data etc., we carried out the geological interpretation by forward and inverse methods. The result shows that the airborne Bouguer gravity anomaly was clear, the fracture interpretation was reliable, and the inversion depth of the main geological interfaces was relatively accurate. This airborne gravity geological survey not only filled the exploring gaps in the onshore- offshore transitional area, and realized the geological and tectonic junction between the sea and the land, but also discovered four local gravity anomalies, 11 fractures and three sags or subsags, and so on. The good geological effect of airborne gravimetry not restricted by terrain condition shows that it can be served as a new geophysical method in the exploration of complex terrain physiognomy area such as mountain, jungle, desert, marsh, onshore-offshore transitional area and so on, and has an extensive application prospect in china in the future.

关键词： airborne gravimetry geological survey potential application onshore-offshoretransitional area

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Identifying the spatio-temporal variability of human activity intensity and associated drivers: a case study on the Tibetan Plateau

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Frontiers of Earth Science 2022年第3期16卷 744-756页

作者： Cai LIU Haiyan ZHANG Fuping GAN Yunge LU Hao WANG Jiahong ZHANG Xing JU College of Earth Sciences Chengdu University of TechnologyChengdu 610059China Key Laboratory of Airborne Geophysics and remote sensing Geology(Ministry of Nature resources) Beijing 100083China china aero geophysical survey and remote sensing center for Natural resources Beijing 100083China Institute of Geographical Sciences and Natural resources Research Chinese Academy of SciencesBeijing 100101China

Human activities have significantly degraded ecosystems and their associated *** understanding the spatio-temporal variability and drivers of human activity intensity(HAI),we can better evaluate the interactions between human and terrestrial ecosystems,which is essential for land-use related decision making and eco-environmental *** the“third pole,”the Tibetan Plateau(TP)plays a strong role in shaping the global environment,and acts as an important ecological security barrier for *** on land-use/cover change data,environmental geographic data,and socioeconomic data,we adopted a method for converting different land use/cover types into construction land equivalent to calculate the HAI value and applied the Getis-Ord Gi*statistic to analyze the spatio-temporal dynamics associated with HAI since 1980 on the ***,we explored the forces driving the HAI changes using GeoDetector software and a correlation *** main conclusions are as follows:It was observed that HAI increased slowly from 3.52%to 3.65%during the 1980-2020 period,with notable increases in the western part of the Qaidam Basin and Hehuang ***,HAI was associated with a significant agglomeration effect,which was mainly concentrated in the regions of the Yarlung Zangbo and Yellow-Huangshui *** natural and anthropogenic factors were identified as important driving forces behind the spatial changes in HAI,of which soil type,gross domestic product,and population density had the greatest ***,the temporal changes in HAI were largely driven by economic *** information provides crucial guidance for territory development planning and ecological-protection policy decisions.

关键词： Tibetan Plateau human activity intensity GeoDetector spatio-temporal variability driving factors

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Hydrocarbon Exploration in the South Yellow Sea Based on Airborne Gravity,china

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Journal of Earth Science 2016年第4期27卷 686-698页

作者： Wenyong Li Yanxu Liu Bing Li Feng Luo china aero geophysical survey&remote sensing center for land and resources Beijing 100083China

Differences between the Cenozoic and pre-Cenozoic strata and structures in the middlesouth South Yellow Sea are analyzed using high-resolution airborne gravity data combined with data from offshore wells, seismic exploration and the regional geological background, using forward and inverse methods. We discuss why hydrocarbon exploration has so far failed in the South Yellow Sea, and put forward alternative future exploration plans. The results show that there are thick Cenozoic strata over Jurassic-Cretaceous continental strata in the southern basin of the South Yellow Sea, contrasted with thick Mid-Paleozoic marine strata preserved in the middle uplift area. In the mid-southern South Yellow Sea, airborne Bouguer gravity anomalies are fragmentized with scattered local anomalies. Many tensile normal faults and minor fault blocks occur in the Cenozoic strata. In contrast, reverse faults and nappe structures are found in pre-Cenozoic strata. The essential reasons for the lack of a breakthrough in hydrocarbon exploration are the complexity of geological structures, hydrocarbon accumulation environments, seismic-geologic conditions, and the difficulty of interpreting and understanding these features, rather than an imbalance of exploration framework. Hydrocarbon exploration should be targeted at Mid-Cenozoic continental strata, especially of Paleogene age, in the middle to southern parts of the South Yellow Sea. Special attention should be paid to the favorable structural belts SYI1, SYI2, SYI3 and SYI4 in the southern basin of the South Yellow Sea, where detailed seismic exploration or drilling should be carried out. Attention should also be given to Mid-Paleozoic marine strata in the middle uplift area of the South Yellow Sea. Key strategies that could lead to a hydrocarbon exploration breakthrough are improving exploration resolution, conducting detailed studies of fine structures, and accurately locating minor structures.

关键词： airborne gravity strata and structures hydrocarbon exploration Paleogene SouthYellow Sea.

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Deep Learning in Gravity Research：A Review

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Journal of Earth Science 2023年

作者： Qingkui Meng Lianghui Guo Shuai Zhang Hanyu Lou Rui Li School of Geophysics and Information Technology china University of Geosciences (Beijing) china aero geophysical survey and remote sensing center for Natural resources

This study explores the application of deep learning (DL) to gravity research， which is a promising intersection of earth science and information science. DL provides new methods and ideas for exploring and solving problems related to multiple solutions and uncertainty in the study of gravity. We focus on the application of convolutional neural networks， recurrent neural networks， and other DL technologies to gravity data denoising， interpolation， anomaly inversion， field modelling， and geological interpretation. However， importantly， the application of DL to the field of gravity research is still in its initial stage. There is significant potential for development and widespread application in overcoming limitations in sample size， network framework optimization， and generalization ability.

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