气候变化领域集成服务门户(CCPortal): Copper isotope constraints on the origins of basaltic and andesitic magmas in the Tengchong volcanic field, SE Tibet

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DOI	10.1016/j.gsf.2024.101818
	Copper isotope constraints on the origins of basaltic and andesitic magmas in the Tengchong volcanic field, SE Tibet
	Qu, Yuan-Ru; Liu, Sheng-Ao
发表日期	2024
ISSN	1674-9871
起始页码	15
结束页码	4
卷号	15 期号:4
英文摘要	The Tengchong volcano field (TVF), situated at the southeastern margin of the Tibetan Plateau, holds crucial information regarding Cenozoic volcanic activities and geotectonic evolution of the SE Tibet. To provide new constraints on petrogenesis and evolution of the Tengchong volcanism, here we conducted copper (Cu) elemental and isotopic analyses on a suite of samples that document the evolution from basalts to andesites in the TVF. The basalts are Cu-depleted (29.7-36.9 ppm) and have higher d65Cu values (0.19%x-0.40%x, mean = 0.31%x +/- 0.05%x; n = 11) than those of mid-ocean ridge basalts (MORBs, -0.09%x) and the mantle (-0.06%x) as well as the majority of island arc lavas. Along with the low Cu/ Zr ratios, these characteristics are interpreted to reflect the fractionation of isotopically light sulfides in the S-saturated systems during magma ascent, rather than source heterogeneity induced by recycled materials and redox reactions. Compared with the basalts, the andesites have slightly lower Cu contents (14.4-29.4 ppm) and lighter Cu isotopic compositions (mean = -0.14%x +/- 0.06%x; n = 13). These differences cannot be attributed to progressive sulfide fractionation of basaltic magmas but require the assimilation of lower crustal materials with low d65Cu values during evolution of the andesitic magmas. Our results collectively suggest that Cu isotopes can provide valuable insights into magma origin and evolution. (c) 2024 China University of Geosciences (Beijing) and Peking University. Published by Elsevier B.V. on behalf of China University of Geosciences (Beijing). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
英文关键词	Copper isotopes; Sulfide segregation; Magmatic differentiation; Tengchong volcanic field
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001202204500001
来源期刊	GEOSCIENCE FRONTIERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290621
作者单位	China University of Geosciences
推荐引用方式 GB/T 7714	Qu, Yuan-Ru,Liu, Sheng-Ao. Copper isotope constraints on the origins of basaltic and andesitic magmas in the Tengchong volcanic field, SE Tibet[J],2024,15(4).
APA	Qu, Yuan-Ru,&Liu, Sheng-Ao.(2024).Copper isotope constraints on the origins of basaltic and andesitic magmas in the Tengchong volcanic field, SE Tibet.GEOSCIENCE FRONTIERS,15(4).
MLA	Qu, Yuan-Ru,et al."Copper isotope constraints on the origins of basaltic and andesitic magmas in the Tengchong volcanic field, SE Tibet".GEOSCIENCE FRONTIERS 15.4(2024).