气候变化领域集成服务门户(CCPortal): Upper crustal fluids in a large fault system: microstructural; trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl; SE Germany

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DOI	10.1007/s00531-018-1666-y
	Upper crustal fluids in a large fault system: microstructural; trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl; SE Germany
	Schaarschmidt A.; Haase K.M.; de Wall H.; Bestmann M.; Krumm S.; Regelous M.
发表日期	2019
ISSN	14373254
起始页码	521
结束页码	543
卷号	108 期号:2
英文摘要	Fault systems are zones of crustal weakness and are used as pathways for ascending hydrothermal fluids. One impressive example is the more than 150 km long Bavarian Pfahl system at the SW boundary of the Bohemian Massif. Dextral ductile shearing of Moldanubian basement has shaped a several hundred meter wide zone of mylonites and ultramylonites. This setting was reactivated under brittle conditions and infiltrated by fluids resulting in a multi-phase quartz lode. Structural analysis using scanning electron microscopy cathodoluminescence (SEM–CL) images has been carried out in combination with trace element and oxygen isotope analysis on quartz along the system. Three successive quartz phases have been distinguished due to their structural details and trace element contents. Cryptocrystalline quartz fabric in the first quartz phase results from crystallization from a silica gel, whereas in phases II and III, quartz precipitation is characterized by repeated fragmentation and sealing, visible due to strongly varying CL intensities. The δ 18 O of Bavarian Pfahl quartz decreases from 13.8‰ in the NW to 8.5‰ in the SE, whereas quartz from the close-by-situated Wölsendorf fluorite deposit shows δ 18 O between 15.9 and 18.5‰ (vs. SMOW). Flat shale-normalized rare earth element patterns point towards an upper crustal origin of the hydrothermal fluids. The southeastern part of the Bavarian Pfahl is interpreted to represent a deeper crustal level with higher mineralization temperatures (about 350 °C) compared to the rest of the Pfahl (< 250 °C). © 2018, The Author(s).
英文关键词	Cathodoluminescence; Hydrothermal fluid; Oxygen isotopes; Quartz microfabric; Trace elements
语种	英语
scopus关键词	cathodoluminescence; fault zone; hydrochemistry; hydrothermal fluid; microstructure; oxygen isotope; quartz vein; trace element; upper crust; Bavaria; Bohemian Massif; Germany
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/147873
作者单位	GeoZentrum Nordbayern, Friedrich-Alexander Universität, Schlossgarten 5, Erlangen, 91054, Germany
推荐引用方式 GB/T 7714	Schaarschmidt A.,Haase K.M.,de Wall H.,et al. Upper crustal fluids in a large fault system: microstructural; trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl; SE Germany[J],2019,108(2).
APA	Schaarschmidt A.,Haase K.M.,de Wall H.,Bestmann M.,Krumm S.,&Regelous M..(2019).Upper crustal fluids in a large fault system: microstructural; trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl; SE Germany.International Journal of Earth Sciences,108(2).
MLA	Schaarschmidt A.,et al."Upper crustal fluids in a large fault system: microstructural; trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl; SE Germany".International Journal of Earth Sciences 108.2(2019).