气候变化领域集成服务门户(CCPortal): Petrogenesis of the Eocene Highly Fractionated Granite Porphyry with REE Tetrad Effect: An Example from Western Yunnan, Southeastern Tibetan Plateau

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DOI	10.3390/min13111390
	Petrogenesis of the Eocene Highly Fractionated Granite Porphyry with REE Tetrad Effect: An Example from Western Yunnan, Southeastern Tibetan Plateau
	Yang, Hang; Wu, Peng; Liu, Anlin; Wang, Feng
发表日期	2023
EISSN	2075-163X
卷号	13 期号:11
英文摘要	Highly fractionated granites are widely distributed in the crust and provide unique windows into magmatic evolution. This study reports petrography, zircon U-Pb ages, trace elemental, and Hf isotopic, as well as whole-rock elemental and Nd isotopic data of highly fractionated granite porphyries from the Shiguanshan area in western Yunnan, southeastern Tibet. The granite porphyries were formed at 34.0 +/- 0.3 Ma in a post-collisional setting. They are strongly peraluminous (A/CNK = 1.95-2.80), have high SiO2 content (SiO2 = 78.16-79.13 wt.%) and zircon saturation temperatures (803-829 degrees C, average 819 degrees C), and low MgO, with pronounced enrichment in Pb, U, Th, and Rb, and depletion in Ti, Eu, P, Sr, and Ba, and belong to highly fractionated A-type granites. These rocks define linear trends on Harker diagrams and display similar enriched whole-rock Nd isotopic (epsilon Nd(t) = -12.8 to -12.3) and zircon Hf isotopic (epsilon Hf(t) = -10.4 to -8.8) compositions compared to the published data of coeval mantle-derived syenite porphyries, which can be attributed to fractional crystallization processes. A quantitative model suggests that the Shiguanshan granite porphyries likely formed through the fractionation process of a mineral assemblage consisting of plagioclase, K-feldspar, biotite, and amphibole (in a ratio of 40:30:25:5), with fractionation degrees of 50%-55%. The magmatic textures and zircons, decoupling between the REE tetrad effect and fractionation of twin-elements, along with the modeling result of Rayleigh fractionation, suggest that the REE tetrad effect in the Shiguanshan granite porphyries may be caused by fractionation of accessory minerals. Our data, along with regional observations, propose that the generation of these granite porphyries is possibly related to lithospheric removal following the Indo-Asia collision.
关键词	highly fractionated granite porphyry REE tetrad effect fractional crystallization western Yunnan southeastern Tibet
英文关键词	A-TYPE GRANITES; ALKALINE VOLCANIC-ROCKS; TRACE-ELEMENTS; GEOCHEMICAL CONSTRAINTS; YANGTZE CRATON; HF-O; PARTITION-COEFFICIENTS; CONTINENTAL COLLISION; PERALUMINOUS GRANITES; ZIRCON AGES
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001113886800001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283461
作者单位	Kunming University of Science & Technology
推荐引用方式 GB/T 7714	Yang, Hang,Wu, Peng,Liu, Anlin,et al. Petrogenesis of the Eocene Highly Fractionated Granite Porphyry with REE Tetrad Effect: An Example from Western Yunnan, Southeastern Tibetan Plateau[J],2023,13(11).
APA	Yang, Hang,Wu, Peng,Liu, Anlin,&Wang, Feng.(2023).Petrogenesis of the Eocene Highly Fractionated Granite Porphyry with REE Tetrad Effect: An Example from Western Yunnan, Southeastern Tibetan Plateau.MINERALS,13(11).
MLA	Yang, Hang,et al."Petrogenesis of the Eocene Highly Fractionated Granite Porphyry with REE Tetrad Effect: An Example from Western Yunnan, Southeastern Tibetan Plateau".MINERALS 13.11(2023).