气候变化领域集成服务门户(CCPortal): Magnetic fabric constraints for syn-magmatic doming of the laccolithic Brocken granite pluton (Harz Mountains; northern Germany)

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DOI	10.1007/s00531-019-01679-w
	Magnetic fabric constraints for syn-magmatic doming of the laccolithic Brocken granite pluton (Harz Mountains; northern Germany)
	Zundel M.; Friedel C.-H.; Grimmer J.C.
发表日期	2019
ISSN	14373254
起始页码	799
结束页码	816
卷号	108 期号:3
英文摘要	Hyper-solidus fabrics of the early Permian Brocken granite pluton, exposed over an area of c. 160 km² and elongated in NNE–SSW direction, were determined by measuring the anisotropy of magnetic susceptibility (AMS). The Brocken granite pluton consists of five petrographically distinguishable and mappable granitic varieties characterized by a generally paramagnetic behavior with primary biotite, partly altered to chlorite, and secondary tourmaline as the major carrier of the susceptibility. Whereas biotite modal content isolines roughly follow petrographic trends, the tourmaline modal contents do not, hence implying secondary, post-emplacement processes that controlled tourmaline distribution. A few samples with primary and secondary magnetite show ferrimagnetic behavior and are co-axial with the paramagnetic fabrics. The generally low magnetic anisotropies in all granitic varieties are a distinct and challenging feature for determining magmatic flow directions. AMS data indicate the predominance of sub-horizontal fabrics outlining an NNE–SSW trending dome axis interpreted to have resulted from granite sheets stacked syn-magmatically in a high crustal level building up a laccolithic pluton. AMS fabrics together with age data and geophysical indications suggest that the emplacement and distribution of the Brocken granite pluton is structurally controlled by NNE–SSW striking deep fault structures, and only weakly influenced by WNW/NW-trending structures. Late Carboniferous-to-early Permian plutonism in the Harz Mountains evolved in an E–W directed extensional regime, and was accompanied by volcanic activity and development of NW- and NE-trending sedimentary basins. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Anisotropy of magnetic susceptibility (AMS); Brocken granite pluton; Early Permian; Harz Mountains; Laccolith; Syn-magmatic doming
语种	英语
scopus关键词	Carboniferous; dome; emplacement; granite; laccolith; magmatism; magnetic anisotropy; magnetic fabric; Permian; pluton; Germany; Harz Mountains
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/147859
作者单位	Institute of Applied Geosciences, Karlsruher Institute of Technology (KIT), Adenauerring 20a, Karlsruhe, 76131, Germany; Department 5 Geosciences, Geodynamics of Polar Regions, University of Bremen, Klagenfurter Straße 2-4, Bremen, 28359, Germany; Karl-Marx-Str. 56, Leipzig, 04158, Germany
推荐引用方式 GB/T 7714	Zundel M.,Friedel C.-H.,Grimmer J.C.. Magnetic fabric constraints for syn-magmatic doming of the laccolithic Brocken granite pluton (Harz Mountains; northern Germany)[J],2019,108(3).
APA	Zundel M.,Friedel C.-H.,&Grimmer J.C..(2019).Magnetic fabric constraints for syn-magmatic doming of the laccolithic Brocken granite pluton (Harz Mountains; northern Germany).International Journal of Earth Sciences,108(3).
MLA	Zundel M.,et al."Magnetic fabric constraints for syn-magmatic doming of the laccolithic Brocken granite pluton (Harz Mountains; northern Germany)".International Journal of Earth Sciences 108.3(2019).