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DOI	10.1111/1755-6724.14919
	Rutile to Titanite Transformation in Eclogites and its Geochemical Consequences: An Example from the Sumdo Eclogite, Tibet
	Zhao, Linghao; Zeng, Lingsen; Gao, Li'e; Hu, Mingyue; Sun, Dongyang; Zhang, Lifei
发表日期	2023
ISSN	1000-9515
EISSN	1755-6724
起始页码	122
结束页码	133
卷号	97 期号:1
英文摘要	The formation of titanite coronae after rutile is common in retrograde high- to ultrahigh-pressure meta-mafic rocks, which provides a good opportunity to address the geochemical behavior of HFSE in crustal environments. In the Sumdo eclogite, titanite occurs either as a corona around rutile grains or as semi-continuous veins cross-cutting the major foliation, whereas rutile grains occur either as inclusions in garnet or omphacite or as a relict core surrounded by titanite. Textural relationships and trace elements characteristics of rutile and titanite with different occurrences indicate that both minerals preferentially incorporate Nb and Hf over Ta and Zr in aqueous fluid. Moreover, the breakdown of omphacite and epidote could release substantial amounts of aqueous fluids enriched in Ca, Si, Fe and REE, which would react with rutile to form titanite coronae and veins. During this process, water-insoluble elements, like HFSE and HREE, behave like mobile elements, but they do not migrate substantially out of the system, instead, tending to react in situ. This suggests that the aqueous fluids released during the retrograde metamorphic reactions in mafic rocks could not substantially transfer fluid-immobile elements into the overlying mantle wedge in subduction environments.
关键词	Sumdo eclogite rutile titanite trace element geochemistry Nb-Ta fractionation
英文关键词	BEARING AQUEOUS FLUIDS; TRACE-ELEMENTS; SUBDUCTION-ZONES; HIGH-PRESSURE; EXPERIMENTAL CONSTRAINTS; ZIRCON GEOCHRONOLOGY; NB/TA FRACTIONATION; CONTINENTAL-CRUST; ION MICROPROBE; LHASA TERRANE
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000952820100008
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283483
作者单位	Ministry of Natural Resources of the People's Republic of China; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; Peking University
推荐引用方式 GB/T 7714	Zhao, Linghao,Zeng, Lingsen,Gao, Li'e,et al. Rutile to Titanite Transformation in Eclogites and its Geochemical Consequences: An Example from the Sumdo Eclogite, Tibet[J],2023,97(1).
APA	Zhao, Linghao,Zeng, Lingsen,Gao, Li'e,Hu, Mingyue,Sun, Dongyang,&Zhang, Lifei.(2023).Rutile to Titanite Transformation in Eclogites and its Geochemical Consequences: An Example from the Sumdo Eclogite, Tibet.ACTA GEOLOGICA SINICA-ENGLISH EDITION,97(1).
MLA	Zhao, Linghao,et al."Rutile to Titanite Transformation in Eclogites and its Geochemical Consequences: An Example from the Sumdo Eclogite, Tibet".ACTA GEOLOGICA SINICA-ENGLISH EDITION 97.1(2023).