气候变化领域集成服务门户(CCPortal): Tectono-metamorphic evolution of the Calabria continental lower crust: the case of the Sila Piccola Massif

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DOI	10.1007/s00531-020-01873-1
	Tectono-metamorphic evolution of the Calabria continental lower crust: the case of the Sila Piccola Massif
	Ortolano G.; Visalli R.; Fazio E.; Fiannacca P.; Godard G.; Pezzino A.; Punturo R.; Sacco V.; Cirrincione R.
发表日期	2020
ISSN	14373254
起始页码	1295
结束页码	1319
卷号	109 期号:4
英文摘要	A combined structural and petrological study focuses on the Sila Piccola Massif to obtain new constraints on the exhumation history of a relic fragment of the intermediate to deep portion of the Variscan basement, which now belongs to the northern Calabria Peloritani Orogen. The timescale of the early (i.e. late-Variscan) shear-assisted exhumation stage is determined by diffusion-modelling and the strain rate of the latest (i.e. Alpine) shear event is determined by microstructurally derived paleopiezometry. The intermediate to deep portion of the Sila basement is characterised by a pervasive mylonitic horizon involving orthogneiss and, to a lesser extent, garnet paragneiss. Such a pervasive mylonitic foliation widely obliterated an older metamorphic fabric, which is preserved as relics in low-strain domains. The pre-mylonitic relics consist of plagioclase, biotite, white mica, sillimanite, quartz and the first generation of chemically homogeneous garnet. Our results show that the later mylonitization can be ascribed to two metamorphic stages. The first stage is associated with a late-Variscan extensional shearing, which shows a syn-kinematic growth of a second-generation garnet with plagioclase, biotite and quartz developed in the pressure shadows of garnet porphyroclasts likely during an early retrograde metamorphic stage. The second stage, characterised by a syn-shearing growth of chlorite, white mica, plagioclase and quartz, observed along the C-planes, is interpreted as a late Alpine mylonitic overprint in compressional regime. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Calabria-peloritani orogen; Effective reactant volumes; Image analysis; Paleopiezometry
语种	英语
scopus关键词	basement rock; Calabrian; continental crust; exhumation; Hercynian orogeny; image analysis; lower crust; metamorphism; piezometer; tectonic evolution; Apennines; Calabria; Italy; Messina [Sicily]; Peloritani Mountains; Sicily; Sila 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/147670
作者单位	Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università degli Studi di Catania, Corso Italia 57, Catania, 95129, Italy; Institut de Physique du Globe de Paris, Université de Paris, UMR CNRS 7154, Paris Cedex 05, 75238, France
推荐引用方式 GB/T 7714	Ortolano G.,Visalli R.,Fazio E.,et al. Tectono-metamorphic evolution of the Calabria continental lower crust: the case of the Sila Piccola Massif[J],2020,109(4).
APA	Ortolano G..,Visalli R..,Fazio E..,Fiannacca P..,Godard G..,...&Cirrincione R..(2020).Tectono-metamorphic evolution of the Calabria continental lower crust: the case of the Sila Piccola Massif.International Journal of Earth Sciences,109(4).
MLA	Ortolano G.,et al."Tectono-metamorphic evolution of the Calabria continental lower crust: the case of the Sila Piccola Massif".International Journal of Earth Sciences 109.4(2020).