Sedimentation of the Lower Cretaceous Xiagou formation and Its Response to Regional Tectonics in the Qingxi Sag, Jiuquan Basin, NW China

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dc.contributor.utaustinauthorChen, Sien_US
dc.creatorChen, Sien_US
dc.creatorWang, Huaen_US
dc.creatorWei, Junen_US
dc.creatorLv, Zhenyu Y.en_US
dc.creatorGan, Huajun J.en_US
dc.creatorJin, Siding D.en_US
dc.date.accessioned2016-09-23T18:05:47Z
dc.date.available2016-09-23T18:05:47Z
dc.date.issued2014-01en_US
dc.description.abstractUnder the constraint of an isochronous sequence stratigraphic framework, sediment infill of the Xiagou Formation reflects the overall control of dynamic tectonic movements and episodic sedimentations in the Qingxi Sag. Structure reactivity during post-depositional processes could cause stratigraphic variations in longitudinal time and lateral space. This study documents sediment infill features and their response to the tectonic evolutions of the Qingxi Sag. The data sets include comparison of cores, well drilling, 3D seismic, inter-well correlation, wave impedance inversion profiles, original strata recovery data, sedimentary fades spatial evolution and their superimposition with paleogeomorphology. The Jiuquan Basin is a Mesozoic-Cenozoic superposition basin comprising an early rifting graben phase and a later compression phase. Since the Early Cretaceous, the basin has undergone four major tectonic episodes: 1) extension during the Early Cretaceous, 2) tectonic inversion caused by northwest-southeast contraction from the Late Cretaceous to the Paleocene, 3) weak extension from the Eocene to the Miocene and 4) contraction from the Miocene to the present. Therefore, the Jiuquan Basin is the product of taphrogenic, collisional and shearing movements. Seismic interpretations of sequence and maximum flooding surface divide the Xiagou Formation into three third order sequences: SQK1g(0), SQK1g(1) and SQK1g(2+3). Five sedimentary facies associations are identified: the shoreland plain, fan delta dominated sedimentary systems, turbidite deposits, shallow lakes and half-deep lake systems. From K1g(0) to K1g(2+3), decreased sandstone percentages in three fan delta areas indicate a continuously transgressive process, which shows the transition from proximal to distal sites in most statistic wells and an obvious decrease of fan delta scales. The northeast-southwest faults control the lakeward distributions of delta fronts and turbidite fans. The correspondence of sedimentary infill and its response to tectonic movements have been demonstrated in the Qingxi Sag. The more active eastern part of the northeastern boundary fault has an important influence on the northeastward migration of depocenters in the Xiagou Formation. The topography developed continuously from K1g(0) to K1g(2+3), but the diminished subsidence indicates the dominant geological process varying from intense fault rifting in an early period to relatively gentle and overall subsidence in a later period during the Early Cretaceous. (C) 2013 Elsevier Ltd. All rights reserved.en_US
dc.description.departmentEarth and Planetary Sciencesen_US
dc.description.sponsorshipKey Laboratory of Tectonics and Petroleum Resources, Ministry of Education TPR-2011-09en_US
dc.description.sponsorshipProject of "Double strong effect, driving mechanism and hydrocarbon significance of tectonic activity during depositional period of Dongying Formation in Qikou and Nanpu Sag, Eastern China" 41272122en_US
dc.identifierdoi:10.15781/T2804XM28
dc.identifier.citationChen, Si, Hua Wang, Jun Wei, Zhenyu Lv, Huajun Gan, and Siding Jin. "Sedimentation of the Lower Cretaceous Xiagou Formation and its response to regional tectonics in the Qingxi Sag, Jiuquan Basin, NW China." Cretaceous Research 47 (Jan., 2014): 72-86.en_US
dc.identifier.doi10.1016/j.cretres.2013.11.006en_US
dc.identifier.issn0195-6671en_US
dc.identifier.urihttp://hdl.handle.net/2152/41077
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialCretaceous Researchen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectjiuquan basinen_US
dc.subjectqingxi sagen_US
dc.subjectxiagou formationen_US
dc.subjectsediment infillen_US
dc.subjecttectonicen_US
dc.subjectevolutionen_US
dc.subjectjiuxi basinen_US
dc.subjectnorthwest chinaen_US
dc.subjectwestern chinaen_US
dc.subjectqikou sagen_US
dc.subjectevolutionen_US
dc.subjectstratigraphyen_US
dc.subjectplateauen_US
dc.subjecthistoryen_US
dc.subjectzoneen_US
dc.subjectoilen_US
dc.subjectgeologyen_US
dc.subjectpaleontologyen_US
dc.titleSedimentation of the Lower Cretaceous Xiagou formation and Its Response to Regional Tectonics in the Qingxi Sag, Jiuquan Basin, NW Chinaen_US
dc.typeArticleen_US

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