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Article: Maturation of East Junggar oceanic arc related to supracrustal recycling driven by arc–arc collision: perspectives from zircon Hf–O isotopes

TitleMaturation of East Junggar oceanic arc related to supracrustal recycling driven by arc–arc collision: perspectives from zircon Hf–O isotopes
Authors
KeywordsArc–arc collision
East Junggar oceanic arc
Oceanic arc maturation
Supracrustal recycling
Zircon Hf–O isotopes
Issue Date5-Feb-2022
PublisherSpringer
Citation
International Journal of Earth Sciences, 2022, v. 111, p. 2519-2533 How to Cite?
Abstract

Oceanic arcs are crucial sites for producing new continental crust. However, how the continental crust has acquired its bulk “andesitic to dacitic” compositions is not well-understood. To address this issue, we carry out an integrated study for granitoids from the East Junggar oceanic arc, Central Asian Orogenic Belt. All the granitoid samples with ages of 332–280 Ma have high SiO2 but low MgO contents, indicating a dominant crustal source. Based on zircon O isotopes, these granitoids can be divided into three groups: Group I (5.0 ± 0.46‰, 2SD), Group II (8.6 ± 0.47–9.4 ± 0.52‰, 2SD) and Group III (6.8 ± 0.36–7.4 ± 0.48‰, 2SD) with mantle-like, elevated and intermediate zircon δ18O ratios, respectively. The formation of Group I granitoids can be ascribed to partial melting of juvenile mafic crust, while Group II and III granitoids were likely derived from a mixed source of juvenile mafic crust and supracrustal rocks in variable proportions. Combined with their depleted mantle-like zircon εHf(t) values (+ 11.6 to + 13.5), it is inferred that these supracrustal rocks were mainly isotopically unevolved, immature volcanogenic sediments. The zircon Hf–O isotope array is compatible with mixing between juvenile mafic crust and supracrustal volcanics (40–70% for Group II and 20–40% for Group III) in their magma sources. The incorporation of supracrustal rocks into such high-δ18O granitoids was likely associated with fore-/intra-arc basin closure triggered by arc–arc collision. Our results thus highlight the role of supracrustal recycling induced by collisional events in driving the compositional differentiation of oceanic arc crust from basaltic to felsic.


Persistent Identifierhttp://hdl.handle.net/10722/338495
ISSN
2023 Impact Factor: 1.8
2023 SCImago Journal Rankings: 0.781
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, Yunying-
dc.contributor.authorSun, Min-
dc.contributor.authorYin, Jiyuan-
dc.contributor.authorYuan, Chao-
dc.contributor.authorSun, Zhen-
dc.contributor.authorXia, Xiaoping-
dc.date.accessioned2024-03-11T10:29:19Z-
dc.date.available2024-03-11T10:29:19Z-
dc.date.issued2022-02-05-
dc.identifier.citationInternational Journal of Earth Sciences, 2022, v. 111, p. 2519-2533-
dc.identifier.issn1437-3254-
dc.identifier.urihttp://hdl.handle.net/10722/338495-
dc.description.abstract<p>Oceanic arcs are crucial sites for producing new continental crust. However, how the continental crust has acquired its bulk “andesitic to dacitic” compositions is not well-understood. To address this issue, we carry out an integrated study for granitoids from the East Junggar oceanic arc, Central Asian Orogenic Belt. All the granitoid samples with ages of 332–280 Ma have high SiO<sub>2</sub> but low MgO contents, indicating a dominant crustal source. Based on zircon O isotopes, these granitoids can be divided into three groups: Group I (5.0 ± 0.46‰, 2SD), Group II (8.6 ± 0.47–9.4 ± 0.52‰, 2SD) and Group III (6.8 ± 0.36–7.4 ± 0.48‰, 2SD) with mantle-like, elevated and intermediate zircon δ<sup>18</sup>O ratios, respectively. The formation of Group I granitoids can be ascribed to partial melting of juvenile mafic crust, while Group II and III granitoids were likely derived from a mixed source of juvenile mafic crust and supracrustal rocks in variable proportions. Combined with their depleted mantle-like zircon εHf(t) values (+ 11.6 to + 13.5), it is inferred that these supracrustal rocks were mainly isotopically unevolved, immature volcanogenic sediments. The zircon Hf–O isotope array is compatible with mixing between juvenile mafic crust and supracrustal volcanics (40–70% for Group II and 20–40% for Group III) in their magma sources. The incorporation of supracrustal rocks into such high-δ<sup>18</sup>O granitoids was likely associated with fore-/intra-arc basin closure triggered by arc–arc collision. Our results thus highlight the role of supracrustal recycling induced by collisional events in driving the compositional differentiation of oceanic arc crust from basaltic to felsic.<br></p>-
dc.languageeng-
dc.publisherSpringer-
dc.relation.ispartofInternational Journal of Earth Sciences-
dc.subjectArc–arc collision-
dc.subjectEast Junggar oceanic arc-
dc.subjectOceanic arc maturation-
dc.subjectSupracrustal recycling-
dc.subjectZircon Hf–O isotopes-
dc.titleMaturation of East Junggar oceanic arc related to supracrustal recycling driven by arc–arc collision: perspectives from zircon Hf–O isotopes-
dc.typeArticle-
dc.identifier.doi10.1007/s00531-022-02164-7-
dc.identifier.scopuseid_2-s2.0-85124314600-
dc.identifier.volume111-
dc.identifier.spage2519-
dc.identifier.epage2533-
dc.identifier.eissn1437-3262-
dc.identifier.isiWOS:000751585500001-
dc.identifier.issnl1437-3254-

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