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Rheological Properties of Fractal Deformation in Multilayer Folds

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 544-549页

作者： hou guiting The Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space Sciences Peking University Beijing 100871 China

The fractal dimensions of folds are related to layer thickness and viscosity of the multilayer. This paper discusses how the thickness, viscosity, and anisotropic degree affect the rheological deformation of fractal folds in multilayers. The number of layers, their thicknesses, viscosities, and anisotropic degree of multilayers cooperate to affect the rheological deformation of folds, which is not controlled by a single rheological factor. A greater anisotropic degree of multilayers is favorable to develop the more complex and disharmonious fractal folds.

关键词： multilayer fold fractal dimension rheology viscosity thickness anisotropic degree

Mechanism for three types of mafic dyke swarms

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Geoscience Frontiers 2012年第2期3卷 217-223页

作者： guiting hou The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space SciencesPeking University Beijing 100871 China

This study proposes three models to explain the mechanism of the three major types of mafic dyke swarms. Parallel dyke swarms form in response to a regional stress field, e.g. the mafic dyke swarms in the North China Craton, whereas small radiating dyke swarm forms due to stress constructions around a plutonic or volcanic edifice, such as the dyke swarm at Spanish Peak, USA. The third type of radiating dyke swarm is giant fan-shaped dyke swarm such as the Mackenzie dyke swarm. Fractures that formed prior to magmatism may play a vital role in dictating the dyke swarm geometry. In most of the cases, the pre-existing fractures are induced by tectonic stresses and not by magma injection though magma injection can increase the fracture size by propagation at the dyke tip.

关键词： Parallel dyke swarm Radiating dyke swarm Hole model Plug model

Late Permian to Triassic intraplate orogeny of the southern Tianshan and adjacent regions, NW China

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Geoscience Frontiers 2014年第1期5卷 83-93页

作者： Wei Ju guiting hou School of Earth and Space Science Peking University The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education

The South Tianshan Orogen and adjacent regions of Central Asia are located in the southwestern part of the Central Asian Orogenic Belt. The formation of South Tianshan Orogen was a diachronous, scissors-like process, which took place during the Palaeozoic, and its western segment was accepted as a site of the final collision between the Tarim Craton and the North Asian continent, which occurred in the late Palaeozoic. However, the post-collisional tectonic evolution of the South Tianshan Orogen and adjacent regions remains debatable. Based on previous studies and recent geochronogical data, we suggest that the final collision between the Tarim Craton and the North Asian continent occurred during the late Carboniferous. Therefore, the Permian was a period of intracontinental environment in the southern Tianshan and adjacent regions. We propose that an earlier, small-scale intraplate orogenic stage occurred in late Permian to Triassic time, which was the first intraplate process in the South Tianshan Orogen and adjacent regions. The later large- scale and well-known Neogene to Quaternary intraplate orogeny was induced by the collision between the India subcontinent and the Eurasian plate. The paper presents a new evolutionary model for the South Tianshan Orogen and adjacent regions, which includes seven stages：（I） late Ordovician-early Silurian opening of the South Tianshan Ocean; （11） middle Silurian-middle Devonian subduction of the South Tianshan Ocean beneath an active margin of the North Asian continent; （111） late Devonian-late Carboniferous closure of the South Tianshan Ocean and collision between the Kazakhstan-Yili and Tarirn continental blocks; （IV） early Permian post-collisional magmatism and rifting; （V） late Permian-Triassic the first intraplate orogeny; （Vt） Jurassic-Palaeogene tectonic stagnation and （VII） Neocene-Quaternary intraplate orogeny.

关键词： Central Asian Orogenic Belt Northern Xinjiang South Tianshan Ocean Tectonics Tarim-North Asia collision

Insights into the Tectonic Fractures in the Yanchang Formation Interbedded Sandstone-Mudstone of the Ordos Basin Based on Core Data and Geomechanical Models

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Acta Geologica Sinica(English Edition) 2015年第6期89卷 1986-1997页

作者： JU Wei SUN Weifeng hou guiting Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of Education School of Resources and Geoscience China University of Mining and Technology School of Earth and Space Science Peking University The State Key Laboratory of Continental Tectonics and Dynamics Institute of Geology Chinese Academy of Geological Sciences PetroChina Research Institute of Petroleum Exploration and Development

The distribution and intensity of tectonic fractures within geologic units are important to hydrocarbon exploration and development. Taken the Upper Triassic Yanchang Formation interbedded sandstone-mudstone in the Ordos Basin as an example, this study used the finite element method（FEM） based on geomechanical models to study the development of tectonic fractures. The results show that the sandstones tend to generate tectonic fractures more easily than mudstones with the same layer thickness, and the highest degree of tectonic fractures will be developed when the sandstone-mudstone thickness ratio is about 5.0. A possible explanation is proposed for the tectonic fracture development based on two important factors of rock brittleness and mechanical layer thickness. Generally, larger rock brittleness and thinner layer thickness will generate more tectonic fractures. In interbedded sandstone-mudstone formations, the rock brittleness increases with the increasing mechanical layer thickness, hence, these two factors will achieve a balance for the development of tectonic fractures when the sandstone-mudstone thickness ratio reaches a specific value, and the development degree of tectonic fractures is the highest at this value.

关键词： tectonic fractures interbedded sandstone-mudstone formations sandstone-mudstonethickness ratio Yanchang Formation rock rupture value Ordos Basin

Mesozoic-Cenozoic extension of the Bohai Sea： contribution to the destruction of North China Craton

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Frontiers of Earth Science 2014年第2期8卷 202-215页

作者： guiting hou K. R. HARI The Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space Sciences Peking University Beijing 100871 China School of Studies in Geology and Water Resource Management Pt. Ravishankar Shukla University Raipur 492010 India

The Bohai Sea is a Late Mesozoic-Cenozoic feature of the basin-mountain system located in eastern North China Craton （NCC）. The Late Mesozoic thinning of the lithosphere signals the early destruction of the NCC. The onset of the destruction was due to the delamination of thick lithosphere of the craton, represented by the NW- trending grabens in an en-echelon arrangement west to Tanlu Fault, and by the NNE-trending grabens within the Tanlu Fault Zone. The Late Mesozoic NW-trending grabens are overprinted by structures related to the Cenozoic NE-trending pull-apart basin with very thick Mesozoic-Cenozoic sediments in the eastern NCC. C- frequency diagrams of growth faults and the extension factor （fl） of four sections across the basin suggest that the extension migrated from the margin to the center of Bohai Sea, and that the Mesozoic and Cenozoic extension factors for Bohai Sea are higher than that of the margin. These evidences suggest that the greatest extension occurred in the center of Bohai Sea, which is consistent with the thinnest crust being found in the center of the sea. The extension ratios and tectonic evolution of the Bohai Sea suggest that it is the key region for the destruction of the NCC, as evidenced by the topography. However, the NCC experienced two stages of destruction with the late stage related to the tectonic regime of Northeast Asia.

关键词： Bohai Sea extension pull-apart lithosphericthinning destruction of craton

End Late Paleozoic tectonic stress field in the southern edge of Junggar Basin

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Geoscience Frontiers 2012年第5期3卷 707-715页

作者： Wei Ju guiting hou Le Li Fangfeng Xiao The Key Laboratory of Orogenic Belts and Crustal Ew~lution Ministry of Education School of Earth and Space Science PekingUniversity Beijing 100871 China Institute of Oil and Gas Research Peking University Beijing 100871 China

This paper presents the end Late Paleozoic tectonic stress field in the southern edge of Junggar Basin by interpreting stress-response structures （dykes, folds, faults with slickenside and conjugate joints）. The direction of the maximum principal stress axes is interpreted to be NW-SE （about 325°）, and the accommodated motion among plates is assigned as the driving force of this tectonic stress field. The average value of the stress index Rt is about 2.09, which indicates a variation from strike-slip to compressive tectonic stress regime in the study area during the end Late Paleozoic period. The reconstruction of the tectonic field in the southern edge of Junggar Basin provides insights into the tectonic deformation processes around the southern Junggar Basin and contributes to the further understanding of basin evolution and tectonic settings during the culmination of the Paleo- zoic.

关键词： Tectonic stress field Junggar Basin End Late Paleozoic Stress-response structures Stress regime

Mechanics of Mafic Dyke Swarms and Breakup of Supercontinent

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 155-156页

作者： hou guiting The Key Laboratory of Orogenic Belts and Crustal Evolution Education MinistrationSchool of Earth and Space Sciences Peking University

Dyke swarms can be divided into three types:parallel dyke swarms,radiating dyke swarms and fan-shape dyke swarm,for which the mechanisms of formation are different(Fig.1).Parallel dyke swarms form in response

关键词： Li Mechanics of Mafic Dyke Swarms and Breakup of Supercontinent NCC

Deep Deformation Processes in the Southern Ningxia Geomorphic Belt: Insight from Two-dimensional Particle-in-cell Finite Difference Numerical Modelling

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Acta Geologica Sinica(English Edition) 2021年第S1期95卷 115-117页

作者： ZHAO Yilin WANG Xianying SHI Wei hou guiting Institute of Geomechanics Chinese Academic of Geological SciencesBeijing 100081China School of Earth and Space Sciences Peking UniversityBeijing 100871China Guangzhou Marine Geological Survey China Geological SurveyGuangzhou 510075China

The deep lateral growth process of the plateau is a hot topic in earth *** the growth boundary zone of the northeastern Tibetan Plateau,southern Ningxia geomorphic zone is controlled by four major arcuate fault zones(... 详细信息

关键词： northeastern Tibetan Plateau Ordos block southern Ningxia geomorphic belt deep lateral growth processes numerical modeling

Possibility of the Application of the Ultra-long Electromagnetic Wave Remote Sensor to Marine Geological Exploration

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 391-393页

作者： hou guiting QIAN Xianglin WANG Shuyuan SUN Jing Department of Geology Peking UniversityBeijing 100871

The ultra-long electromagnetic wave remote sensing technique developed by Peking University is one of new future techniques, which can detect the submarine geological information from the depth of 20 to 10000 m below the surface by receiving natural ultra-long electromagnetic waves (n Hz to n 100 Hz). The new remote sensor is composed of three parts: a main instrument with a portable computer, an antenna with an amplifier and an external power.

关键词： ultra-long electromagnetic wave new remote sensor lithologic interface submarine information