Permian pyroxenite dykes in harzburgite with signatures of the mantle, subduction channel and accretionary wedge evolution (Austroalpine Unit, Eastern Alps)

doi:10.1016/j.lithos.2018.05.030

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Permian pyroxenite dykes in harzburgite with signatures of the mantle, subduction channel and accretionary wedge evolution (Austroalpine Unit, Eastern Alps)
	Putis, Marian 1; Li, Xian-Hua 2,5; Yang, Yue-Heng 2,5; Li, Qiu-li 2,5; Nemec, Ondrej 1; Ling, Xiaoxiao 2; Koller, Friedrich 3; Balen, Draien 4
刊名	LITHOS
	2018-08-01
卷号	314 页码:165-186
关键词	Eastern Alps Pyroxenite dyke P-T path Zircon U-Pb SIMS age Lu/Hf isotopes Rock and mineral chemistry
ISSN号	0024-4937
DOI	10.1016/j.lithos.2018.05.030
英文摘要	Websterite and garnet orthopyroxenite and clinopyroxenite dykes crosscutting harzburgite occur in the hanging wall of a Cretaceous eclogitized continental fragment of the Upper Austroalpine Unit in the Eastern Alps. The dyke textures reflect pressure-temperature changes from the mantle, subduction channel and an accretionary wedge. A clinopyroxenite dyke, dated at 252 +/- 2 Ma on zircon by U-Pb SIMS, provided epsilon(Hf)(t) zircon values of 16-8 (ay. 11 from 18 spots) suggesting a depleted mantle source. The rock modal mineral composition and the mineral and whole-rock chemistry revealed that the pyroxenite dykes' petrogenesis is most likely related to sub-crustal cumulate-type melt derivates, less evolved for websterites and highly evolved for clino- and orthopyroxenites. The porphyroclastic clinopyroxenel (10-13 mol% Ca-Ts), orthopyroxene1, spinel1 and amphibole1 are inferred remnants after magmatic phases. They contain Ti-spinel and ilmenite exsolutions which indicate cooling of the dykes in harzburgite in a Spl stability field (D0-1 stage). Garnet exsolutions in Cpx1, Opx1 and Amp1, and Cpx exsolutions in Amp1 document continuous cooling and/or pressure increase (D0-2 stage). The Grt coronas around Spl1, Opx1, Cpx1 and Amp1, and the granoblastic matrix of Prp-Grs-rich Grt (or Cr-Spl in websterites), low-Al Cpx, low-Al Opx, Fe-enriched olivine, zoisite, kyanite, rutile and pargasite record a subduction channel compression (D1 stage). While the formation of Cpx-Grt or Amp-Grt symplectites replacing the Cpx1 and Amp1 rims suggests the HP-HT decompression (D2-1 exhumation stage). The Grt (or Cr-Spl) replacement by Spl, and Opx1, Cpx1 and Prg replacement by Ol-Spl, Opx-Spl or Prg-Spl symplectites document continuous HT decompression (D2-2 exhumation stage). The MP/MT-LT conditions were estimated from tremolite, Grs-rich Grt, Sr-epidote, clinozoisite, Cl-apatite, titanite, Ce-allanite, chlorite, serpentine and talc assemblage (D3 stage). Anticlockwise P-T path was reconstructed for the D0 to D1 stages followed by almost isothermal exhumation (D2) and emplacement in the Cretaceous accretionary wedge (D3). The pseudosection P-T calculation from a clinopyroxenite dyke yielded 850-825 degrees C and 25-28 kbar (D1). The whole-rock and mineral trace element data of relic Cpx1 and Amp1, Grt(1-3), Ep-Zo, and younger zircon ages due to Pb-loss, reflect the impact of metamorphic fluids during the D1 to D3 evolutionary stages. (C) 2018 Elsevier B.V. All rights reserved.
资助项目	Slovak Research and Development Agency[APVV-15-0050] ; China Ministry of Science and Technology[2016YFE0203000] ; VEGA Agency[1/0079/15]
WOS关键词	U-PB ; PRESSURE METAMORPHISM ; WESTERN CARPATHIANS ; GARNET PERIDOTITE ; PHASE-EQUILIBRIA ; TRACE-ELEMENT ; LU-HF ; CLINOPYROXENE ; EXSOLUTION ; COMPLEX
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000441854400012
资助机构	Slovak Research and Development Agency ; China Ministry of Science and Technology ; VEGA Agency ; Slovak Research and Development Agency ; China Ministry of Science and Technology ; VEGA Agency ; Slovak Research and Development Agency ; China Ministry of Science and Technology ; VEGA Agency ; Slovak Research and Development Agency ; China Ministry of Science and Technology ; VEGA Agency
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88563]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Putis, Marian
作者单位	1.Comenius Univ, Fac Nat Sci, Dept Mineral & Petrol, Bratislava 84215, Slovakia 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Univ Vienna, Dept Lithospher Res, Althanstr 14, A-1090 Vienna, Austria 4.Univ Zagreb, Dept Geol, Fac Sci, Horvatovac 95, Zagreb 10000, Croatia 5.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Putis, Marian,Li, Xian-Hua,Yang, Yue-Heng,et al. Permian pyroxenite dykes in harzburgite with signatures of the mantle, subduction channel and accretionary wedge evolution (Austroalpine Unit, Eastern Alps)[J]. LITHOS,2018,314:165-186.
APA	Putis, Marian.,Li, Xian-Hua.,Yang, Yue-Heng.,Li, Qiu-li.,Nemec, Ondrej.,...&Balen, Draien.(2018).Permian pyroxenite dykes in harzburgite with signatures of the mantle, subduction channel and accretionary wedge evolution (Austroalpine Unit, Eastern Alps).LITHOS,314,165-186.
MLA	Putis, Marian,et al."Permian pyroxenite dykes in harzburgite with signatures of the mantle, subduction channel and accretionary wedge evolution (Austroalpine Unit, Eastern Alps)".LITHOS 314(2018):165-186.