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

doi:10.1007/s00531-022-02164-7

GIG OpenIR

	Zhang, Yunying 1,2,3; Sun, Min 3; Yin, Jiyuan 4; Yuan, Chao 5; Sun, Zhen 1,2; Xia, Xiaoping 5
	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
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.