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Article: Detrital zircon provenance constraints on the final closure of the middle segment of the Paleo-Asian Ocean

TitleDetrital zircon provenance constraints on the final closure of the middle segment of the Paleo-Asian Ocean
Authors
KeywordsBeishan Orogenic Belt
Detrital zircon U-Pb-Hf isotopes
Late Paleozoic
Paleo-Asian Ocean
Provenance
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2019, v. 69, p. 73-88 How to Cite?
AbstractThe main site and timing of the final closure of the middle segment of the Paleo-Asian Ocean (PAO) has been an issue of hot debate, which hampers us from better understanding the late-stage tectonic evolution of the Central Asian Orogenic Belt (CAOB). Synthesizing the available geological records for the ophiolitic mélanges in the Beishan Orogenic Belt (BOB), we regard the Liuyuan ophiolitic mélange as the main site of the final closure of the middle segment of the PAO. To determine the final closure time of the middle segment of the PAO, this study mainly applied field-based, systematic zircon U-Pb-Hf isotopic analyses for the Carboniferous and Permian sedimentary successions on the northern and southern sides of the Liuyuan ophiolitic mélange. Our results indicate that the late Carboniferous sedimentary successions north of the Liuyuan mélange consisting mainly of interbedded sandstone and siltstone with minor conglomerate show primarily affinity with a local, single source, i.e. the constituent units of the BOB north of the Liuyuan mélange. They were closely associated with the northward subduction of the middle segment of the PAO. By contrast, the unconformably overlying Permian clastic deposition on both sides of the Liuyuan ophiolitic mélange shows comparable lithology that fines from a thick sequence of conglomerate at the base to thin-bedded turbidite sequences up section. These Permian units were probably deposited in a progressively deepening basin within an extensional post-collision regime after the disappearance of the middle segment of the PAO. All the <274–261 Ma sandstones on both sides of the Liuyuan ophiolitic mélange were derived from commingling source regions on both sides of the Liuyuan mélange, as supported by comparable, diagnostic ages and ε Hf (t) values between the studied detrital zircons and coeval magmatic zircons from the BOB and north Tarim. Such a marked transition from a single, local provenance in the late Carboniferous to commingling provenances at ca. 274–261 Ma indicates the final closure of the middle segment of the PAO prior to the end of the early Permian. In conjunction with available data for the eastern and western segments of the PAO, we establish the eastward-younging, scissor-like closure for the whole PAO during mid Carboniferous to Early Triassic time. © 2019
Persistent Identifierhttp://hdl.handle.net/10722/274949
ISSN
2017 Impact Factor: 5.657
2015 SCImago Journal Rankings: 4.949

 

DC FieldValueLanguage
dc.contributor.authorLiu, Q-
dc.contributor.authorZhao, G-
dc.contributor.authorHan, Y-
dc.contributor.authorZhu, Y-
dc.contributor.authorWang, B-
dc.contributor.authorEizenhöfer, PR-
dc.contributor.authorZhang, X-
dc.date.accessioned2019-09-10T02:32:13Z-
dc.date.available2019-09-10T02:32:13Z-
dc.date.issued2019-
dc.identifier.citationGondwana Research, 2019, v. 69, p. 73-88-
dc.identifier.issn1342-937X-
dc.identifier.urihttp://hdl.handle.net/10722/274949-
dc.description.abstractThe main site and timing of the final closure of the middle segment of the Paleo-Asian Ocean (PAO) has been an issue of hot debate, which hampers us from better understanding the late-stage tectonic evolution of the Central Asian Orogenic Belt (CAOB). Synthesizing the available geological records for the ophiolitic mélanges in the Beishan Orogenic Belt (BOB), we regard the Liuyuan ophiolitic mélange as the main site of the final closure of the middle segment of the PAO. To determine the final closure time of the middle segment of the PAO, this study mainly applied field-based, systematic zircon U-Pb-Hf isotopic analyses for the Carboniferous and Permian sedimentary successions on the northern and southern sides of the Liuyuan ophiolitic mélange. Our results indicate that the late Carboniferous sedimentary successions north of the Liuyuan mélange consisting mainly of interbedded sandstone and siltstone with minor conglomerate show primarily affinity with a local, single source, i.e. the constituent units of the BOB north of the Liuyuan mélange. They were closely associated with the northward subduction of the middle segment of the PAO. By contrast, the unconformably overlying Permian clastic deposition on both sides of the Liuyuan ophiolitic mélange shows comparable lithology that fines from a thick sequence of conglomerate at the base to thin-bedded turbidite sequences up section. These Permian units were probably deposited in a progressively deepening basin within an extensional post-collision regime after the disappearance of the middle segment of the PAO. All the <274–261 Ma sandstones on both sides of the Liuyuan ophiolitic mélange were derived from commingling source regions on both sides of the Liuyuan mélange, as supported by comparable, diagnostic ages and ε Hf (t) values between the studied detrital zircons and coeval magmatic zircons from the BOB and north Tarim. Such a marked transition from a single, local provenance in the late Carboniferous to commingling provenances at ca. 274–261 Ma indicates the final closure of the middle segment of the PAO prior to the end of the early Permian. In conjunction with available data for the eastern and western segments of the PAO, we establish the eastward-younging, scissor-like closure for the whole PAO during mid Carboniferous to Early Triassic time. © 2019-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr-
dc.relation.ispartofGondwana Research-
dc.subjectBeishan Orogenic Belt-
dc.subjectDetrital zircon U-Pb-Hf isotopes-
dc.subjectLate Paleozoic-
dc.subjectPaleo-Asian Ocean-
dc.subjectProvenance-
dc.titleDetrital zircon provenance constraints on the final closure of the middle segment of the Paleo-Asian Ocean-
dc.typeArticle-
dc.identifier.emailZhao, G: gzhao@hku.hk-
dc.identifier.emailZhang, X: zxr627@hku.hk-
dc.identifier.authorityZhao, G=rp00842-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gr.2019.01.001-
dc.identifier.scopuseid_2-s2.0-85060355208-
dc.identifier.hkuros302937-
dc.identifier.volume69-
dc.identifier.spage73-
dc.identifier.epage88-
dc.publisher.placeNetherlands-

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