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Article: Early Mesozoic unroofing pattern of the Dabie Mountains (China): Constraints from the U-Pb detrital zircon geochronology and Si-in-white mica analysis of synorogenic sediments in the Jianghan Basin

TitleEarly Mesozoic unroofing pattern of the Dabie Mountains (China): Constraints from the U-Pb detrital zircon geochronology and Si-in-white mica analysis of synorogenic sediments in the Jianghan Basin
Authors
KeywordsDabie HP-UHP rocks
Early Mesozoic synorogenic sediments
Jianghan basin
Si-in-white mica
Yangtze basement supply
Zircon U-Pb geochronology
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2009, v. 266 n. 3-4, p. 240-250 How to Cite?
AbstractThis paper presents the results of an integrated U-Pb detrital zircon geochronology and Si-in-white mica analysis for synorogenic sediments in the Jianghan Basin to the south of the Dabie Orogen. The results provide an improved understanding of the provenance of these sediments and the unroofing pattern of the early Mesozoic Dabie Mountain. Si contents of detrital white micas range from 3.09 to 3.34 atoms pfu for the upper Triassic sandstones whereas 3.06 to 3.59 atoms pfu for the lower and middle Jurassic sandstones. The majority of detrital white micas in the lower Jurassic sandstones is phengitic and originated exclusively from the Dabie high- to ultrahigh- pressure rocks. The U-Pb dating results of the detrital zircons for seven samples suggest that these synorogenic sediments have a significant change of provenance from late Triassic to early and middle Jurassic. For the upper Triassic sandstone, the U-Pb age clusters of these zircons are characterized by ~ 420-450 Ma, ~ 750-820 Ma, ~ 1050-1200 Ma and ~ 2500 Ma with minor Luliangian (~ 1700-2000 Ma) components. In contrast, the zircon ages of the Jurassic sandstones are dominated by the Luliangian (~ 1700-2000 Ma) ages with only minor Caledonian (~ 420-450 Ma) and Greenville (~ 1050-1200 Ma) ages. In combination with other available geological data, it can be concluded that the Dabie HP-UHP rocks might initially be exposed to the surface at the beginning of early Jurassic (~ 190 Ma). The Jiangnan terrain (also named "Jiangnan old continental in Chinese) to the south of the Jianghan basin provided the predominant supply of upper Triassic sediments, whereas the Paleoproterozoic Yangtze crustal materials (overlying the present Dabie Complex at the time) were the important provenance of the Jurassic sediments in the Jianghan basin. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151286
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
Funding AgencyGrant Number
Chinese Academy of SciencesKZCY2-yw-128, KZCX1-YW-15-1
Ministry of Science and Technology of China2007CB411403
Nature Sciences Foundation of China40825009
40772129
Opening Foundation of State Key Laboratory of Ore Deposit Geochemistry, Institute of GeochemistryCAS (200704)
Funding Information:

We would like to thank Dr. Z-Y Xu for their help during field trip and sample collection. We are grateful to Prof. D. Rickard, S. Gao, and another anonymous reviewer for their critical and constructive review, which led to major improvement of the manuscript. This study was financially supported by projects from the Chinese Academy of Sciences (KZCY2-yw-128, KZCX1-YW-15-1), the Ministry of Science and Technology of China (2007CB411403) and the Nature Sciences Foundation of China (40825009, 40772129) and Opening Foundation of State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, CAS (200704). This is a contribution to NO IS091104 to GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorXia, Xen_HK
dc.contributor.authorZhang, Yen_HK
dc.contributor.authorFan, Wen_HK
dc.contributor.authorLi, Cen_HK
dc.contributor.authorBi, Xen_HK
dc.contributor.authorLi, Sen_HK
dc.date.accessioned2012-06-26T06:20:06Z-
dc.date.available2012-06-26T06:20:06Z-
dc.date.issued2009en_HK
dc.identifier.citationChemical Geology, 2009, v. 266 n. 3-4, p. 240-250en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151286-
dc.description.abstractThis paper presents the results of an integrated U-Pb detrital zircon geochronology and Si-in-white mica analysis for synorogenic sediments in the Jianghan Basin to the south of the Dabie Orogen. The results provide an improved understanding of the provenance of these sediments and the unroofing pattern of the early Mesozoic Dabie Mountain. Si contents of detrital white micas range from 3.09 to 3.34 atoms pfu for the upper Triassic sandstones whereas 3.06 to 3.59 atoms pfu for the lower and middle Jurassic sandstones. The majority of detrital white micas in the lower Jurassic sandstones is phengitic and originated exclusively from the Dabie high- to ultrahigh- pressure rocks. The U-Pb dating results of the detrital zircons for seven samples suggest that these synorogenic sediments have a significant change of provenance from late Triassic to early and middle Jurassic. For the upper Triassic sandstone, the U-Pb age clusters of these zircons are characterized by ~ 420-450 Ma, ~ 750-820 Ma, ~ 1050-1200 Ma and ~ 2500 Ma with minor Luliangian (~ 1700-2000 Ma) components. In contrast, the zircon ages of the Jurassic sandstones are dominated by the Luliangian (~ 1700-2000 Ma) ages with only minor Caledonian (~ 420-450 Ma) and Greenville (~ 1050-1200 Ma) ages. In combination with other available geological data, it can be concluded that the Dabie HP-UHP rocks might initially be exposed to the surface at the beginning of early Jurassic (~ 190 Ma). The Jiangnan terrain (also named "Jiangnan old continental in Chinese) to the south of the Jianghan basin provided the predominant supply of upper Triassic sediments, whereas the Paleoproterozoic Yangtze crustal materials (overlying the present Dabie Complex at the time) were the important provenance of the Jurassic sediments in the Jianghan basin. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.rightsChemical Geology. Copyright © Elsevier BV.-
dc.subjectDabie HP-UHP rocksen_HK
dc.subjectEarly Mesozoic synorogenic sedimentsen_HK
dc.subjectJianghan basinen_HK
dc.subjectSi-in-white micaen_HK
dc.subjectYangtze basement supplyen_HK
dc.subjectZircon U-Pb geochronologyen_HK
dc.titleEarly Mesozoic unroofing pattern of the Dabie Mountains (China): Constraints from the U-Pb detrital zircon geochronology and Si-in-white mica analysis of synorogenic sediments in the Jianghan Basinen_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.emailXia, X: xpxia@hotmail.comen_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authorityXia, X=rp00815en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.chemgeo.2009.06.012en_HK
dc.identifier.scopuseid_2-s2.0-68749084872en_HK
dc.identifier.hkuros159550-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-68749084872&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume266en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage240en_HK
dc.identifier.epage250en_HK
dc.identifier.isiWOS:000270346400012-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, Y=36496272800en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridXia, X=35241486400en_HK
dc.identifier.scopusauthoridZhang, Y=37048183700en_HK
dc.identifier.scopusauthoridFan, W=7401635313en_HK
dc.identifier.scopusauthoridLi, C=8953042200en_HK
dc.identifier.scopusauthoridBi, X=7102242579en_HK
dc.identifier.scopusauthoridLi, S=8784176300en_HK

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