气候变化领域集成服务门户(CCPortal): Organic metamorphism as a key for reconstructing tectonic processes: a case study from the Austroalpine unit (Eastern Alps)

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DOI	10.1007/s00531-020-01897-7
	Organic metamorphism as a key for reconstructing tectonic processes: a case study from the Austroalpine unit (Eastern Alps)
	Rantitsch G.; Iglseder C.; Schuster R.; Hollinetz M.S.; Huet B.; Werdenich M.
发表日期	2020
ISSN	14373254
起始页码	2235
结束页码	2253
卷号	109 期号:6
英文摘要	At the northwestern margin of the Gurktal Alps (Eastern Alps), Eoalpine (Cretaceous) thrusting of carbonaceous material (CM) bearing metasediments formed a very low- to low-grade metamorphic nappe stack above higher-grade metamorphic basement nappes. Sedimentary burial as well as progressive metamorphism transformed the enclosed CM to anthracite, metaanthracite and semigraphite. In a kinematically well-constrained section at the northwestern frontal margin of the nappe stack, this transformation has been investigated by vitrinite reflectance measurements and Raman spectroscopy of carbonaceous materials (RSCM). Automated, interactive fitting of Raman spectra estimates the metamorphic peak temperatures in a complete section through the upper part of the Upper Austroalpine unit. A RSCM trend indicates a temperature profile of ca. 250–600 °C. The top part of the gradient is reconstructed by one-dimensional thermal modeling. The certainty of ca. ± 25 °C at a confidence level of 0.9 resembles the data variability within a sample location. Due to the large calibration range, the method is able to reconstruct a thermal crustal profile in space and time. The study highlights the versatility of RSCM, which characterizes almost 250 Ma of a complex and polyphase tectonic history. RSCM data characterize the Variscan metamorphic grade in nappes now imbricated in the Eoalpine nappe stack. They additionally constrain a numerical model which emphasizes the significance of an increased thermal gradient in a continental margin towards the western Neotethyan ocean during Permo-Triassic lithospheric extension. It finally characterizes the Eoalpine metamorphic gradient during nappe stacking and a significant metamorphic jump related to exhumation and normal faulting. © 2020, The Author(s).
英文关键词	Eastern Alps; Geothermometry; Gurktal Alps; Organic metamorphism; Raman spectroscopy; Upper Austroalpine Unit
语种	英语
scopus关键词	burial (geology); Hercynian orogeny; metamorphism; nappe; Raman spectroscopy; tectonic reconstruction; temperature profile; vitrinite reflectance; Alps; Eastern 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/147634
作者单位	Montanuniversität Leoben, Lehrstuhl für Geologie und Lagerstättenlehre, Peter-Tunner Straße 5, Leoben, 8700, Austria; Geologische Bundesanstalt Wien, Neulinggasse 38, Wien, 1030, Austria; Department für Geodynamik und Sedimentologie, Universität Wien, Althanstraße 14, Wien, 1090, Austria
推荐引用方式 GB/T 7714	Rantitsch G.,Iglseder C.,Schuster R.,et al. Organic metamorphism as a key for reconstructing tectonic processes: a case study from the Austroalpine unit (Eastern Alps)[J],2020,109(6).
APA	Rantitsch G.,Iglseder C.,Schuster R.,Hollinetz M.S.,Huet B.,&Werdenich M..(2020).Organic metamorphism as a key for reconstructing tectonic processes: a case study from the Austroalpine unit (Eastern Alps).International Journal of Earth Sciences,109(6).
MLA	Rantitsch G.,et al."Organic metamorphism as a key for reconstructing tectonic processes: a case study from the Austroalpine unit (Eastern Alps)".International Journal of Earth Sciences 109.6(2020).