Knowledge Management System Of Guangzhou Institute of Geochemistry,CAS
Zhang, Yunying1,2,3; Sun, Min3; Yin, Jiyuan4; Yuan, Chao5; Sun, Zhen1,2; Xia, Xiaoping5 | |
Maturation of East Junggar oceanic arc related to supracrustal recycling driven by arc-arc collision: perspectives from zircon Hf-O isotopes | |
刊名 | INTERNATIONAL JOURNAL OF EARTH SCIENCES
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ISSN号 | 1437-3254 |
2022-02-05 | |
页码 | 15 |
DOI | 10.1007/s00531-022-02164-7 |
语种 | 英语 |
WOS研究方向 | Geology |
摘要 | 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 parts per thousand, 2SD), Group II (8.6 +/- 0.47-9.4 +/- 0.52 parts per thousand, 2SD) and Group III (6.8 +/- 0.36-7.4 +/- 0.48 parts per thousand, 2SD) with mantle-like, elevated and intermediate zircon delta O-18 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 epsilon Hf(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-delta O-18 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. |
关键词 | Oceanic arc maturation Supracrustal recycling Arc-arc collision Zircon Hf-O isotopes East Junggar oceanic arc |
WOS记录号 | WOS:000751585500001 |
收录类别 | SCI |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gig.ac.cn/handle/344008/66081 |
通讯作者 | Yin, Jiyuan |
作者单位 | 1.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab, Guangzhou 511458, Peoples R China 3.Univ Hong Kong, Dept Earth Sci, Pok Fu Lam, Pokfulam Rd, Hong Kong, Peoples R China 4.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing 100037, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, Yunying,Sun, Min,Yin, Jiyuan,et al. Maturation of East Junggar oceanic arc related to supracrustal recycling driven by arc-arc collision: perspectives from zircon Hf-O isotopes[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2022:15. |
APA | Zhang, Yunying,Sun, Min,Yin, Jiyuan,Yuan, Chao,Sun, Zhen,&Xia, Xiaoping.(2022).Maturation of East Junggar oceanic arc related to supracrustal recycling driven by arc-arc collision: perspectives from zircon Hf-O isotopes.INTERNATIONAL JOURNAL OF EARTH SCIENCES,15. |
MLA | Zhang, Yunying,et al."Maturation of East Junggar oceanic arc related to supracrustal recycling driven by arc-arc collision: perspectives from zircon Hf-O isotopes".INTERNATIONAL JOURNAL OF EARTH SCIENCES (2022):15. |
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