气候变化领域集成服务门户(CCPortal): Constraining the pressure–temperature evolution and geodynamic setting of UHT granulites and migmatitic paragneisses of the Gruf Complex; Central Alps

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DOI	10.1007/s00531-019-01686-x
	Constraining the pressure–temperature evolution and geodynamic setting of UHT granulites and migmatitic paragneisses of the Gruf Complex; Central Alps
	Oalmann J.; Duesterhoeft E.; Möller A.; Bousquet R.
发表日期	2019
ISSN	14373254
起始页码	911
结束页码	930
卷号	108 期号:3
英文摘要	Thermodynamic modeling of compositionally mapped microdomains and whole-rock compositions is used to constrain the pressure–temperature (P–T) evolution of sapphirine granulites and migmatitic paragneisses from the Gruf Complex of the Central Alps. The P–T paths and conditions estimated from granulite microdomains and whole-rock compositions are consistent with one another, indicating that the estimates from both types of compositions are accurate. The sapphirine granulites were heated to ultra-high temperature conditions of 900–1000 °C and 7.0–9.5 kbar as they were decompressed from ca. 800 °C and 9–12 kbar, resulting in garnet breakdown. In a subsequent step, nearly isothermal decompression led to the development of cordierite-bearing coronae and symplectites. By ca. 27 Ma, the sapphirine granulites had been exhumed to the midcrustal level of the migmatitic paragneisses, which were undergoing peak metamorphism at ca. 675–750 °C and 5–7 kbar. These results are consistent with a geodynamic model that invokes heat advection to the lower crust closely following the continental-subduction (ultra-high pressure) stage of the Alpine orogeny. The most plausible geodynamic model consistent with the results of this study is breakoff of a southward subducting lithospheric slab, resulting in asthenospheric mantle flow. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Central Alps; Charnockite; Gruf complex; Sapphirine granulite; Thermodynamic modeling; UHT metamorphism
语种	英语
scopus关键词	charnockite; geodynamics; gneiss; granulite; lower crust; migmatite; orogeny; P-T conditions; sapphire; subduction zone; thermodynamics; ultrahigh temperature metamorphism; Alps
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147860
作者单位	Department of Geology, The University of Kansas, 1475 Jayhawk Blvd, Lawrence, KS 66045, United States; Earth Observatory of Singapore, Nanyang Technological University, 50 Nanyang Avenue, Block N2-01B-30, Singapore, 639798, Singapore; Institute of Geosciences, Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Straße 10, Kiel, 24098, Germany
推荐引用方式 GB/T 7714	Oalmann J.,Duesterhoeft E.,Möller A.,等. Constraining the pressure–temperature evolution and geodynamic setting of UHT granulites and migmatitic paragneisses of the Gruf Complex; Central Alps[J],2019,108(3).
APA	Oalmann J.,Duesterhoeft E.,Möller A.,&Bousquet R..(2019).Constraining the pressure–temperature evolution and geodynamic setting of UHT granulites and migmatitic paragneisses of the Gruf Complex; Central Alps.International Journal of Earth Sciences,108(3).
MLA	Oalmann J.,et al."Constraining the pressure–temperature evolution and geodynamic setting of UHT granulites and migmatitic paragneisses of the Gruf Complex; Central Alps".International Journal of Earth Sciences 108.3(2019).