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Interpretation of gravity data for fault distribution near the Mongolia-Hinggan metallogenic belt in the eastern China-Mongolia frontier area

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Frontiers of Earth Science 2018年第4期12卷 808-817页

作者： Jun WANG Xiaohong MENG Zhaoxi CHEN Fang LI Key Laboratory of Geo-detection (China University of Geosciences Beijing)Ministry of EducationBeijing 100083China School of Geophysics and Information Technology China University of GeosciencesBeijing 100083China China Aero Geophysical Survey and Remote Sensing Center for Land and Resources Beijing 100083China

The Central Asian Orogenic Belt (CAOB) is a giant suture zone produced by the reduction of the Paleo- Asian Ocean between the Siberian, North China, and Tarim cratons. The CAOB formed in three main stages, including continental accretion, late collision, and intracontinental orogeny. Strong crust-mantle interaction also occurred during these stages. The eastern China-Mongolia frontier area is an important part of the CAOB. Since the Caledonian period, this region has frequently experienced polycyclic tectonic reformation and intense magmatic activities. All of these geological activities lay the foundation for abundant metal resources. In the past, several large metal ore deposits have been founded there. However, the deep structure of different tectonic units and the fault distribution in the eastern China-Mongolia border frontier area are still not clear owing to the complex geological environment. Existing works in that region are insufficient for an in-depth understanding of the metallogenic deposits. The work discussed in this paper was carried out in the eastern China-Mongolia frontier area with measured gravity data along a profile and gravity data extracted from the WGM2012 earth’s gravity model for detailed fault distribution. In this study, empirical mode decomposition (EMD) and tilt angle analysis (TDR) were utilized for processing the gridded gravity data. The measured gravity data were inverted with a 2D inversion algorithm for density distribution along the survey line. The inversion result was used to verify the existence of known faults and describe their deeper extensions. Meanwhile, new faults were also identified along the survey line and then marked on the gridded data to get their horizontal distribution. These results provide significant information for the in-depth understanding of the tectonic units in the study area.

关键词： the CAOB China-Mongolia frontier area gravity data processing and inversion fault distribution

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Lineament Characterization and Their Tectonic Significance Using gravity data and Field Studies in the Al-Jufr Area,Southeastern Jordan Plateau

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Journal of Earth Science 2012年第6期23卷 873-880页

作者： Awni Batayneh Habes Ghrefat Abdullah Diabat Department of Geology and Geophysics King Saud UniversityRiyadh 11451Saudi Arabia Institute of Earth and Environmental Sciences Al al-Bayt UniversityMafraqJordan

Lineaments in the southeastern Jordan plateau are mapped using gravity data and field studies in order to understand the tectonic origin of these lineaments, especially in relation to the Dead Sea transform （DST） and the Red Sea opening. Four sets trending E-W, NW-SE, NE-SW, and N-S are identified in gravity data. Field studies generally reveal similar orientations. Field and gravity studies indicate that most of the lineaments are extensional features that correspond to normal faults. Most of these were subsequently reactivated into strike-slip shear fractures. The NW-SE and N-S lineaments represent dilatational fractures. The N-S trending lineaments are the oldest. The E-W lineaments form conjugate shear fractures and are younger than the N-S lineaments. These conjugate shear fractures are also older than other set of conjugate shear fractures oriented NE-SW. The evolution of all these fractures is attributed to the DST and the Red Sea spreading. Kinematic and dynamic analysis of the two, older and younger, pairs of conjugate strike-slip fractures revealed, respectively, broadly NW-SE and N-S oriented transpressional stress with corresponding transtensional stress oriented NE-SW and E-W.

关键词： Jordan plateau gravity data lineament dilatational fracture shear fracture.

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Interpretation of the west segment of the coastal fault zone in the coastal region of South China based on the gravity data

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Geodesy and Geodynamics 2018年第2期9卷 142-150页

作者： Lisi Bi Zhenhuan Ren Xiuwei Ye Tianyou Liu Jihua Qiao Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Administration Guangdong Provincial Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Projects China University of Geosciences Development Research Center of China Geological Survey

By systemic processing, comprehensive analysis, and interpretation of gravity data, we confirmed the existence of the west segment of the coastal fault zone(west of Yangjiang to Beibu Bay) in the coastal region of South China. This showed an apparent high gravity gradient in the NEE direction, and worse linearity and less compactness than that in the Pearl River month. This also revealed a relatively large curvature and a complicated gravity structure. In the finding images processed by the gravity data system, each fault was well reflected and primarily characterized by isolines or thick black stripes with a cutting depth greater than 30 km. Though mutually cut by NW-trending and NE-trending faults, the apparent NEE stripe-shaped structure of the west segment of the coastal fault zone remained unchanged,with good continuity and an activity strength higher than that of NW and NE-trending faults. Moreover,we determined that the west segment of the coastal fault zone is the major seismogenic structure responsible for strong earthquakes in the coastal region in the border area of Guangdong, Guangxi, and Hainan.

关键词： Coastal region of South China West segment of the coastal fault zone gravity data Seismogenic structure

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Deeply concealed half-graben at the SW margin of the East European Craton(SE Poland)-Evidence for Neoproterozoic rifting prior to the break-up of Rodinia

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Journal of Palaeogeography 2018年第1期7卷 88-97页

作者： P.Krzywiec P.Poprawa M.Mikotajczak S.Mazur M.Malinowski Institute of Geological Sciences Polish Academy of SciencesWarsawPoland AGH University of Sciences and Technology CracowPoland Institute of Geophysics Polish Academy of SciencesWarsawPoland

Baltica was one of continents formed as a result of Rodinia break-up 850-550 Ma. It was separated from Amazonia(?) by the Tornquist Ocean, the opening of which was preceded by Neoproterozoic extension in a network of continental rifts. Some of these rifts were subsequently aborted whereas the Tornquist Rift gave rise to splitting of Rodinia and formation of the Tornquist Ocean. The results of 1-D subsidence analysis at the fossil passive margin of Baltica provided insight in the timing and kinematics of continental rifting that led to break-up of Rodinia. Rifting was associated with Neoproterozoic syn-rift subsidence accompanied by deposition of continental coarse-grained sediments and emplacement of continental *** from a syn-rift to post-rift phase in the latest Ediacaran to earliest early Cambrian was concomitant with deposition of continental conglomerates and arkoses, laterally passing into mudstones. An extensional scenario of the break-up of Rodinia along the Tornquist Rift is based on the character of tectonic subsidence curves, evolution of syn-rift and post-rift depocenters in time, as well as geochemistry and geochronology of the syn-rift volcanics. It is additionally reinforced by the high-quality deep seismic reflection data from SE Poland, located above the SW edge of the East European Craton. The seismic data allowed for identification of a deeply buried(11-18 km), well-preserved extensional half-graben, developed in the Palaeoproterozoic crystalline basement and filled with a Neoproterozoic syn-rift volcano-sedimentary succession. The results of depth-to-basement study based on integration of seismic and gravity data show the distribution of local NE-SW elongated Neoproterozoic depocenters within the SW slope of the East European Craton. Furthermore,they document the rapid south-eastwards thickness increase of the Neoproterozoic succession towards the NW-SE oriented craton margin. This provides evidence for extensive crustal thinning o

关键词： Rodinia Baltica Tornquist rift Orsha-Volyn Aulacogen Tornquist Ocean Neoproterozoic Seismic data gravity data

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gravity Field Imaging by Continued Fraction Downward Continuation: A Case Study of the Nechako Basin(Canada)

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Acta Geologica Sinica(English Edition) 2021年第S1期95卷 102-105页

作者： ZHANG Chong ZHOU Wenna LV Qingtian YAN Jiayong State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China China Deep Exploration Center-SinoProbe Center Chinese Academy of Geological SciencesBeijing 100037China School of Earth Sciences Key Laboratory of Mineral Resources in Western ChinaLanzhou UniversityLanzhou 730000China

Interpretation of gravity data plays an important role in the study of geologic structure and resource exploration in the deep part of the earth,like the lower crust,the upper mantle(Lüet al.,2013,2019).The gravity a... 详细信息

关键词： depth estimation downward continuation gravity data continued fraction

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Magnetic and gravity Investigations of Lisan Peninsula-Dead Sea(Jordan)

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Journal of Earth Science 1995年第2期14卷 97-102页

作者： BataynehA. Al-ZoubiA. HassounehM.

The Lisan Peninsula is located within the Dead Sea basin which represents the plate boundary between African and Arabian plates . This basin constitutes a good example of a pull - apart basin because of its large dimensions , its structural simplicity and its active subsidence . The gravity data reveal that the Dead Sea basin can be divided into segments, each of them about 30 km long in N -S direction , where the Lisan Peninsula represents the deepest one (9 km thick Pleistocene sediments ), overlying about 6 km thick Mesozoic sediments . In addition . 20 km of extension was predicted along the Dead Sea basin , which indicates that the Dead Sea basin should be about 3.3 Ma in age . Furthermore . the Precambrian basement under the Lisan area is characterized by high susceptibility contrast that is related to continuous tectonic activity in the region .

关键词： gravity data Precambrian basement susceptibility contrast Dead Seabasin .

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