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Article: The Neogene Xiyu Formation, a diachronous prograding gravel wedge at front of the Tianshan: Climatic and tectonic implications

TitleThe Neogene Xiyu Formation, a diachronous prograding gravel wedge at front of the Tianshan: Climatic and tectonic implications
Authors
KeywordsGravel Wedge Progradation
Magnetostratigraphy
Shortening Rates
Tianshan
Xiyu Formation
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth and Planetary Science Letters, 2009, v. 287 n. 3-4, p. 298-310 How to Cite?
AbstractThe Tarim and Junggar basins in central Asia are capped by a thick pile of conglomerates, called the Xiyu Formation, that are commonly linked to a change in climate and/or accelerated uplift near the Plio-Pleistocene boundary. In order to better understand their origin and significance, we carried out a combined structural and magnetostratigraphic study in the Quilitage syncline (southern Tianshan), where the base of the Xiyu conglomerates is observed at both sides of the syncline. A balanced cross-section shows that, even at a local-scale, the base of the Xiyu conglomerates cannot be regarded as a single continuous stratigraphic layer. On the southern flank of the Quilitage syncline, we collected 172 samples collected for magnetostratigraphic dating identify 17 polarity chrons that date the new section from 5.2 to ~ 1.7 Ma and constrain the base of the Xiyu conglomerate here at ~ 1.7 Ma. This is 4.2 Ma younger than the age of the Xiyu previously found on the northern limb of the same syncline. Together with other magnetostratigraphic studies carried out around the Tianshan, our study unambiguously demonstrates that the onset of deposition of the Xiyu conglomerates is diachronous, and that the conglomerates are systematically younger toward the basin. Consequently, the Xiyu Formation should not be considered as a chronostratigraphic marker related to any particular tectonic or climatic event, but is instead a prograding gravel wedge that has prograded over the underthrusting forelands. A synthesis of chronologic and structural results yields progradation rates over the last 10 Ma on the order of ~ 2.0 mm/yr and ~ 3.9 mm/yr south and north of the Tianshan Mountains respectively. These rates are comparable to the shortening rate across the Tianshan range, suggesting that underthrusting is the main factor governing the progradation rate of the Xiyu Formation. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/92341
ISSN
2015 Impact Factor: 4.326
2015 SCImago Journal Rankings: 3.628
ISI Accession Number ID
Funding AgencyGrant Number
French ECLIPSE
Chinese projectkzcx3-sw-147
973 No 2005CB422101
PRAT05-02/T06-04
French ANRANR-05-BLAN-0143-01
Gordon Betty Moore Foundation
Funding Information:

This study was financed by the French ECLIPSE program, the Chinese project kzcx3-sw-147 and 973 No 2005CB422101, PRA (T05-02/T06-04), the French ANR (ANR-05-BLAN-0143-01) and the Gordon Betty Moore Foundation. We present our thanks to Dr. S. Peng and K. Chen for their supports to magnetostratigraphic sampling and to M. Laumonier and E. de Oliveira for their help in the laboratory. This is Caltech Tectonics Observatory contribution 123.

References

 

DC FieldValueLanguage
dc.contributor.authorCharreau, Jen_HK
dc.contributor.authorGumiaux, Cen_HK
dc.contributor.authorAvouac, J-Pen_HK
dc.contributor.authorAugier, Ren_HK
dc.contributor.authorChen, Yen_HK
dc.contributor.authorBarrier, Len_HK
dc.contributor.authorGilder, Sen_HK
dc.contributor.authorDominguez, Sen_HK
dc.contributor.authorCharles, Nen_HK
dc.contributor.authorWang, Qen_HK
dc.date.accessioned2010-09-17T10:43:11Z-
dc.date.available2010-09-17T10:43:11Z-
dc.date.issued2009en_HK
dc.identifier.citationEarth and Planetary Science Letters, 2009, v. 287 n. 3-4, p. 298-310en_HK
dc.identifier.issn0012-821Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/92341-
dc.description.abstractThe Tarim and Junggar basins in central Asia are capped by a thick pile of conglomerates, called the Xiyu Formation, that are commonly linked to a change in climate and/or accelerated uplift near the Plio-Pleistocene boundary. In order to better understand their origin and significance, we carried out a combined structural and magnetostratigraphic study in the Quilitage syncline (southern Tianshan), where the base of the Xiyu conglomerates is observed at both sides of the syncline. A balanced cross-section shows that, even at a local-scale, the base of the Xiyu conglomerates cannot be regarded as a single continuous stratigraphic layer. On the southern flank of the Quilitage syncline, we collected 172 samples collected for magnetostratigraphic dating identify 17 polarity chrons that date the new section from 5.2 to ~ 1.7 Ma and constrain the base of the Xiyu conglomerate here at ~ 1.7 Ma. This is 4.2 Ma younger than the age of the Xiyu previously found on the northern limb of the same syncline. Together with other magnetostratigraphic studies carried out around the Tianshan, our study unambiguously demonstrates that the onset of deposition of the Xiyu conglomerates is diachronous, and that the conglomerates are systematically younger toward the basin. Consequently, the Xiyu Formation should not be considered as a chronostratigraphic marker related to any particular tectonic or climatic event, but is instead a prograding gravel wedge that has prograded over the underthrusting forelands. A synthesis of chronologic and structural results yields progradation rates over the last 10 Ma on the order of ~ 2.0 mm/yr and ~ 3.9 mm/yr south and north of the Tianshan Mountains respectively. These rates are comparable to the shortening rate across the Tianshan range, suggesting that underthrusting is the main factor governing the progradation rate of the Xiyu Formation. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epslen_HK
dc.relation.ispartofEarth and Planetary Science Lettersen_HK
dc.subjectGravel Wedge Progradationen_HK
dc.subjectMagnetostratigraphyen_HK
dc.subjectShortening Ratesen_HK
dc.subjectTianshanen_HK
dc.subjectXiyu Formationen_HK
dc.titleThe Neogene Xiyu Formation, a diachronous prograding gravel wedge at front of the Tianshan: Climatic and tectonic implicationsen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.epsl.2009.07.035en_HK
dc.identifier.scopuseid_2-s2.0-70350223831en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70350223831&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume287en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage298en_HK
dc.identifier.epage310en_HK
dc.identifier.isiWOS:000272010800002-
dc.identifier.citeulike5697531-

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