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Article: Ages and Hf isotopes of detrital zircons from the Permian strata in the Bengbatu area (Inner Mongolia) and tectonic implications

TitleAges and Hf isotopes of detrital zircons from the Permian strata in the Bengbatu area (Inner Mongolia) and tectonic implications
Authors
KeywordsDetrital zircon
U-Pb dating
Hf isotope
Central Asian Orogenic Belt
Subduction
Back-arc basin
Issue Date2019
PublisherElsevier Ltd. The Journal's web site is located at http://www.sciencedirect.com/science/journal/16749871
Citation
Geoscience Frontiers, 2019, v. 10 n. 1, p. 195-212 How to Cite?
AbstractThe Central Asian Orogenic Belt (CAOB) was built up through protracted accretion and collision of a variety of terranes/micro-continents during Neoproterozoic–Mesozoic time. To understand potential links among Paleozoic subduction and accretionary processes that were operative during the development of the southeastern CAOB, we conducted a combined U-Pb and Hf-isotope analysis of detrital zircons from previously defined Devonian, Carboniferous and Early Permian strata in the Bengbatu area, Inner Mongolia. Detrital zircons from (meta-) sandstones in these strata commonly yield major Paleozoic age populations at ca. 300–261 Ma, 351–300 Ma and 517–419 Ma, and also give several Precambrian ages that range from 2687 Ma to 544 Ma. The youngest ages redefine the deposition of all these strata to be in the Middle Permian (Wordian–Capitanian) or later, much younger than previously considered. These ages, coupled with regional magmatic records, support an interpretation of most surrounding areas as possible detritus sources, including the Mongolian arcs to the north, the Northern Accretionary Orogen to the south, and the intervening Erenhot–Hegenshan Ophiolite Belt. Zircons with magmatic ages of ca. 500–350 Ma and ca. 300–261 Ma display a large range of εHf(t) values (−13.97 to +15.31), whereas ca. 350–300 Ma zircons are dominated by positive εHf(t) values (+0.14 to +16.00). These results support the occurrence of two significant shifts of the zircon εHf(t) values, which has tectonic implications for the understanding of the Carboniferous–Permian evolution of the southeastern CAOB. A marked shift from mixed to positive zircon εHf(t) values at 350–330 Ma likely manifests the incipient opening of the Hegenshan Ocean, due to the slab rollback of the subducting Paleo-Asian Oceanic lithosphere. Another shift from positive to mixed zircon εHf(t) values at ca. 300 Ma likely corresponds to a tectonic switch from syn-orogenic subduction-related to post-orogenic extensional setting, genetically related to the tectonic collapse of a formerly overthickened crust.
Persistent Identifierhttp://hdl.handle.net/10722/261117
ISSN
2017 Impact Factor: 4.051
2015 SCImago Journal Rankings: 1.816
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorXu, B-
dc.contributor.authorZhao, G-
dc.contributor.authorLi, J-
dc.contributor.authorLiu, D-
dc.contributor.authorWang, B-
dc.contributor.authorHan, Y-
dc.contributor.authorEizenhöfer, PR-
dc.contributor.authorZhang, X-
dc.contributor.authorHou, W-
dc.contributor.authorLiu, Q-
dc.date.accessioned2018-09-14T08:52:47Z-
dc.date.available2018-09-14T08:52:47Z-
dc.date.issued2019-
dc.identifier.citationGeoscience Frontiers, 2019, v. 10 n. 1, p. 195-212-
dc.identifier.issn1674-9871-
dc.identifier.urihttp://hdl.handle.net/10722/261117-
dc.description.abstractThe Central Asian Orogenic Belt (CAOB) was built up through protracted accretion and collision of a variety of terranes/micro-continents during Neoproterozoic–Mesozoic time. To understand potential links among Paleozoic subduction and accretionary processes that were operative during the development of the southeastern CAOB, we conducted a combined U-Pb and Hf-isotope analysis of detrital zircons from previously defined Devonian, Carboniferous and Early Permian strata in the Bengbatu area, Inner Mongolia. Detrital zircons from (meta-) sandstones in these strata commonly yield major Paleozoic age populations at ca. 300–261 Ma, 351–300 Ma and 517–419 Ma, and also give several Precambrian ages that range from 2687 Ma to 544 Ma. The youngest ages redefine the deposition of all these strata to be in the Middle Permian (Wordian–Capitanian) or later, much younger than previously considered. These ages, coupled with regional magmatic records, support an interpretation of most surrounding areas as possible detritus sources, including the Mongolian arcs to the north, the Northern Accretionary Orogen to the south, and the intervening Erenhot–Hegenshan Ophiolite Belt. Zircons with magmatic ages of ca. 500–350 Ma and ca. 300–261 Ma display a large range of εHf(t) values (−13.97 to +15.31), whereas ca. 350–300 Ma zircons are dominated by positive εHf(t) values (+0.14 to +16.00). These results support the occurrence of two significant shifts of the zircon εHf(t) values, which has tectonic implications for the understanding of the Carboniferous–Permian evolution of the southeastern CAOB. A marked shift from mixed to positive zircon εHf(t) values at 350–330 Ma likely manifests the incipient opening of the Hegenshan Ocean, due to the slab rollback of the subducting Paleo-Asian Oceanic lithosphere. Another shift from positive to mixed zircon εHf(t) values at ca. 300 Ma likely corresponds to a tectonic switch from syn-orogenic subduction-related to post-orogenic extensional setting, genetically related to the tectonic collapse of a formerly overthickened crust.-
dc.languageeng-
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.sciencedirect.com/science/journal/16749871-
dc.relation.ispartofGeoscience Frontiers-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectDetrital zircon-
dc.subjectU-Pb dating-
dc.subjectHf isotope-
dc.subjectCentral Asian Orogenic Belt-
dc.subjectSubduction-
dc.subjectBack-arc basin-
dc.titleAges and Hf isotopes of detrital zircons from the Permian strata in the Bengbatu area (Inner Mongolia) and tectonic implications-
dc.typeArticle-
dc.identifier.emailZhao, G: gzhao@hku.hk-
dc.identifier.emailHan, Y: hanyigui@connect.hku.hk-
dc.identifier.emailLiu, Q: niuniul@hku.hk-
dc.identifier.authorityZhao, G=rp00842-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1016/j.gsf.2018.08.003-
dc.identifier.scopuseid_2-s2.0-85054395738-
dc.identifier.hkuros291435-
dc.identifier.volume10-
dc.identifier.issue1-
dc.identifier.spage195-
dc.identifier.epage212-
dc.identifier.isiWOS:000451806300016-
dc.publisher.placeUnited Kingdom-

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