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Article: Alternating trench advance and retreat: Insights from Paleozoic magmatism in the eastern Tianshan, Central Asian Orogenic Belt

TitleAlternating trench advance and retreat: Insights from Paleozoic magmatism in the eastern Tianshan, Central Asian Orogenic Belt
Authors
KeywordsAccretionary orogen
Arc magmatism
Eastern Tianshan
Tectonic switch
Trench advance
Issue Date2018
PublisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/
Citation
Tectonics, 2018, v. 37 n. 7, p. 2142–2164 How to Cite?
AbstractAccretionary orogens generally involve trench advance and retreat, recognition of which is critical to understand the thermal evolution and geodynamics of the lithosphere. A systematic study has been conducted on the Silurian to Carboniferous volcanic rocks from the Dananhu–Harlik arc in the Chinese eastern Tianshan. Three distinct episodes of volcanism have been recognized: late Silurian normal andesite, high Sr/Y andesite and sanukitoid, late Devonian bimodal high-alumina basalt and dacite, and early Carboniferous high-alumina basalt. These magmatism experienced variable degrees of interaction between a depleted mantle wedge and subducting slab/sediment-derived fluid/melt. Combining with previous geological data, we propose that the Dananhu–Harlik arc was formed by the northward subduction of the North Tianshan Ocean (NTO), different from the traditional southward subduction of the Junggar Ocean which was likely subducted northward to account for the East Junggar arc system. Temporal changes in Ce/Y of basalts and Ho/Yb of felsic rocks in the Dananhu–Harlik arc imply that the arc crust underwent episodic thickening and thinning, which probably reflect the trench advance/retreat processes. The high Ce/Y and Ho/Yb ratios in the late Ordovician to Devonian and late Carboniferous correspond to two phases of trench advance. Conversely, the low Ce/Y and Ho/Yb ratios in the early Carboniferous record a period of trench retreat, which caused the splitting of the Dananhu–Harlik arc and formation of the Bogda back-arc basin. Meanwhile, a southward subduction initiated along the south margin of the NTO, producing the Yamansu arc. Late Carboniferous bipolar subduction of the NTO led to its final closure.
Persistent Identifierhttp://hdl.handle.net/10722/260412
ISSN
2017 Impact Factor: 3.583
2015 SCImago Journal Rankings: 2.628
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, Y-
dc.contributor.authorSun, M-
dc.contributor.authorYuan, C-
dc.contributor.authorLong, X-
dc.contributor.authorJiang, Y-
dc.contributor.authorLi, P-
dc.contributor.authorHuang, Z-
dc.contributor.authorDu, L-
dc.date.accessioned2018-09-14T08:41:17Z-
dc.date.available2018-09-14T08:41:17Z-
dc.date.issued2018-
dc.identifier.citationTectonics, 2018, v. 37 n. 7, p. 2142–2164-
dc.identifier.issn0278-7407-
dc.identifier.urihttp://hdl.handle.net/10722/260412-
dc.description.abstractAccretionary orogens generally involve trench advance and retreat, recognition of which is critical to understand the thermal evolution and geodynamics of the lithosphere. A systematic study has been conducted on the Silurian to Carboniferous volcanic rocks from the Dananhu–Harlik arc in the Chinese eastern Tianshan. Three distinct episodes of volcanism have been recognized: late Silurian normal andesite, high Sr/Y andesite and sanukitoid, late Devonian bimodal high-alumina basalt and dacite, and early Carboniferous high-alumina basalt. These magmatism experienced variable degrees of interaction between a depleted mantle wedge and subducting slab/sediment-derived fluid/melt. Combining with previous geological data, we propose that the Dananhu–Harlik arc was formed by the northward subduction of the North Tianshan Ocean (NTO), different from the traditional southward subduction of the Junggar Ocean which was likely subducted northward to account for the East Junggar arc system. Temporal changes in Ce/Y of basalts and Ho/Yb of felsic rocks in the Dananhu–Harlik arc imply that the arc crust underwent episodic thickening and thinning, which probably reflect the trench advance/retreat processes. The high Ce/Y and Ho/Yb ratios in the late Ordovician to Devonian and late Carboniferous correspond to two phases of trench advance. Conversely, the low Ce/Y and Ho/Yb ratios in the early Carboniferous record a period of trench retreat, which caused the splitting of the Dananhu–Harlik arc and formation of the Bogda back-arc basin. Meanwhile, a southward subduction initiated along the south margin of the NTO, producing the Yamansu arc. Late Carboniferous bipolar subduction of the NTO led to its final closure.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/-
dc.relation.ispartofTectonics-
dc.rightsTectonics. Copyright © American Geophysical Union.-
dc.rightsPreprint Submitted for publication in (journal title). Postprint Accepted for publication in (journal title). Copyright (year) American Geophysical Union. Further reproduction or electronic distribution is not permitted. Published version An edited version of this paper was published by AGU. Copyright (year) American Geophysical Union.-
dc.subjectAccretionary orogen-
dc.subjectArc magmatism-
dc.subjectEastern Tianshan-
dc.subjectTectonic switch-
dc.subjectTrench advance-
dc.titleAlternating trench advance and retreat: Insights from Paleozoic magmatism in the eastern Tianshan, Central Asian Orogenic Belt-
dc.typeArticle-
dc.identifier.emailZhang, Y: zyy518@hku.hk-
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.authoritySun, M=rp00780-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2018TC005051-
dc.identifier.scopuseid_2-s2.0-85050509979-
dc.identifier.hkuros291607-
dc.identifier.volume37-
dc.identifier.issue7-
dc.identifier.spage2142–2164-
dc.identifier.epage2142–2164-
dc.identifier.isiWOS:000441861500012-
dc.publisher.placeUnited States-

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