In-situ oxygen isotope records of crustal self-cannibalization selectively captured by zircon crystals from high-delta Mg-26 granitoids

doi:10.1130/G37725.1

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	In-situ oxygen isotope records of crustal self-cannibalization selectively captured by zircon crystals from high-delta Mg-26 granitoids
	Jo, Hui Je 1; Cheong, Albert Chang-sik 1,2; Ryu, Jong-Sik 2; Kim, Namhoon 3; Yi, Keewook 2; Jung, Haemyeong 4; Li, Xian-Hua 5
刊名	GEOLOGY
	2016-05-01
卷号	44 期号:5 页码:339-342
DOI	10.1130/G37725.1
文献子类	Article
英文摘要	Zircon oxygen-hafnium and biotite magnesium isotopic compositions of Late Cretaceous to Oligocene (88-27 Ma) granitoids from the Gyeongsang continental arc, southeastern Korea, collectively provide a new insight into shallow magma petrogenesis. Zircon crystals extracted from eight calc-alkaline or alkaline plutons commonly contain xenocrystic cores and typically show magmatic cathodoluminescence zonings and sharp Raman spectra. Most zircons have positive epsilon(Hf) values plotting below the mid-ocean-ridge basalt evolution path, indicating that the arc magmatism was dominated by the recycling of juvenile crustal materials. Zircon delta O-18 values shifted upward or downward from the mantle range attest to the O isotopic exchange of crustal protoliths with surface waters at various temperature conditions. Small (< 1 parts per thousand) but discernable core-to-rim decreases of delta O-18 values are recognized selectively in magmatic zircon grains from four plutons possessing biotite delta Mg-26 values (-0.07 parts per thousand to + 2.32 parts per thousand) distinctly higher than the mantle range. Such a concomitant O-Mg isotopic variation provides compelling evidence for a series of self-induced hydrothermal alteration and assimilation processes (i.e., "crustal self-cannibalization"). This study shows that the supracrustal input to magmas in a young and juvenile orogen can be traced effectively by the combination of stable isotope records from the plutonic root.
WOS关键词	MANTLE ; DIFFUSION ; HAFNIUM ; EARTH
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000374877500003
资助机构	Korea Basic Science Institute(G36200) ; Korea Basic Science Institute(G36200) ; Korea Basic Science Institute(G36200) ; Korea Basic Science Institute(G36200)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53486]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Korea Univ Sci & Technol, Dept Isotope Geochem, Daejeon 305350, South Korea 2.Korea Basic Sci Inst, Chungbuk 363883, South Korea 3.Korea Inst Geosci & Mineral Resources, Daejeon 305350, South Korea 4.Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 151742, South Korea 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100027, Peoples R China
推荐引用方式 GB/T 7714	Jo, Hui Je,Cheong, Albert Chang-sik,Ryu, Jong-Sik,et al. In-situ oxygen isotope records of crustal self-cannibalization selectively captured by zircon crystals from high-delta Mg-26 granitoids[J]. GEOLOGY,2016,44(5):339-342.
APA	Jo, Hui Je.,Cheong, Albert Chang-sik.,Ryu, Jong-Sik.,Kim, Namhoon.,Yi, Keewook.,...&Li, Xian-Hua.(2016).In-situ oxygen isotope records of crustal self-cannibalization selectively captured by zircon crystals from high-delta Mg-26 granitoids.GEOLOGY,44(5),339-342.
MLA	Jo, Hui Je,et al."In-situ oxygen isotope records of crustal self-cannibalization selectively captured by zircon crystals from high-delta Mg-26 granitoids".GEOLOGY 44.5(2016):339-342.