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The role of deep-seated half-grabens in the evolution of Huoerguosi-Manasi-Tugulu fold-and-thrust belt, northern Tian Shan, China
PetroChina, Res Inst Petr Explorat & Dev Northwest, Lanzhou 730020, Gansu, Peoples R China;PetroChina, Key Lab Reservoir Descript, Lanzhou 730020, Gansu, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
PetroChina, Res Inst Petr Explorat & Dev Northwest, Lanzhou 730020, Gansu, Peoples R China;PetroChina, Key Lab Reservoir Descript, Lanzhou 730020, Gansu, Peoples R China.
China Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China.
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2019 (English)In: Journal of Geodynamics, ISSN 0264-3707, E-ISSN 1879-1670, Vol. 131, article id 101647Article in journal (Refereed) Published
Abstract [en]

The Huoerguosi-Manasi-Tugulu fold-and-thrust belt, which is located in the southern Junggar Basin, has formed in response to contraction during Late Cenozoic. However, the tectonic environment for its formation before Late Cenozoic is still controversial. In this paper, we use surface data, recently collected and processed subsurface seismic refection data, isopach map of Lower Jurassic and balanced sections to propose pre-existing half-graben system developed in the Lower Jurassic with this fold-and-thrust belt. We also use results of a series of scaled sandbox analogue models, where industrial CT apparatus was used to monitor deformation, to simulate the evolution of this fold-and-thrust belt. We suggest that the segmented shape of the Huoerguosi-Manasi-Tugulu fold-and-thrust belt is a response to the presence of thrust ramps, which were formed during Early Jurassic. During Late Cenozoic shortening, the Lower Jurassic syn-rift sediments served as major detachment horizon, making a pre-existing normal fault act as a stress concentration zone leading to steeping of a thrust-ramp over the normal fault and cover detachment overstep the underlying half-grabens. Modeling results reveal that the presented structural framework has close resemblance with paleostructures especially in the intracontinental environment, which underwent a complex multicycle evolution process, and provide a new prospective for the interpretation of natural examples.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 131, article id 101647
Keywords [en]
Scaled analogue models, Half-graben, South Junggar, Huoerguosi-Manasi-Tugulu fold-and-thrust belt
National Category
Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-399087DOI: 10.1016/j.jog.2019.101647ISI: 000491685400001OAI: oai:DiVA.org:uu-399087DiVA, id: diva2:1379151
Funder
Swedish Research CouncilAvailable from: 2019-12-16 Created: 2019-12-16 Last updated: 2019-12-16Bibliographically approved

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Koyi, Hemin

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