气候变化领域集成服务门户(CCPortal): Characteristics and timing of hydrothermal fluid circulation in the fossil Pyrenean hyperextended rift system: new constraints from the Chaînons Béarnais (W Pyrenees)

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DOI	10.1007/s00531-020-01852-6
	Characteristics and timing of hydrothermal fluid circulation in the fossil Pyrenean hyperextended rift system: new constraints from the Chaînons Béarnais (W Pyrenees)
	Incerpi N.; Manatschal G.; Martire L.; Bernasconi S.M.; Gerdes A.; Bertok C.
发表日期	2020
ISSN	14373254
起始页码	1071
结束页码	1093
卷号	109 期号:3
英文摘要	The evolution of hyperextended rift systems is linked to complex tectonic processes in which fluid activity is much more important than previously thought. This study sheds light on the fluid-sediment interactions within the distalmost parts of the Mauléon-Arzacq hyperextended basin (Western Pyrenees) focusing on the post-depositional modifications of pre- to syn-hyperextension sediments due to hydrothermal fluids. Strong field- and petrography-based evidence demonstrates the presence of fluid-related products affecting the Jurassic to Cretaceous sediments exposed in the Chaînons Béarnais (easternmost Mauléon basin). These are supported by new U–Pb dating of carbonates and microthermometry of fluid inclusions showing temperatures of up to 250 °C and highly depleted δ18O and strongly enriched 87Sr/86Sr values. Two main stages of fluid activity can be defined: (i) a carbonate-rich stage leading to fabric-destructive replacement dolomitization of the pre-rift carbonates, widespread hydro-fracturation giving rise to different types of hydraulic breccias cemented by multi-phase dolomite and calcite dated at ~ 96 Ma; and (ii) a Na-SiO2-rich stage associated with authigenic albite and quartz, mainly affecting syn-rift deposits. Finally, the occurrence of dolomitic marbles and mylonites provide evidence for strong recrystallization and ductile shearing affecting the sediments during the latest stages of hyperextension at ~ 94 Ma. The Chaînons Béarnais represent a primary target to investigate fluid-rock interactions linked to extensional tectonics that can be used as an analogue to compare to other fossil rift systems (e.g. Adriatic paleo-rifted margin) or present-day magma-poor, hyperextended rifted margins (e.g. Iberia-Newfoundland). © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Diagenetic evolution; Hydrothermal fluids; Hyperextended rift system; Mauléon basin; Pyrenees
语种	英语
scopus关键词	carbonate; deposition; extensional tectonics; fluid inclusion; fossil; hydrothermal circulation; hydrothermal fluid; marble; mylonite; petrography; recrystallization; rift zone; tectonics; Pyrenees
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/147689
作者单位	Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso 35, Turin, 10125, Italy; CNRS-UMR 7516, Institut de Physique du Globe, Université de Strasbourg, 1 Rue Blessig, Strasbourg, 67000, France; Department of Earth Sciences, ETH Zürich, Sonneggstrasse 5, Zurich, 8092, Switzerland; Facheinheit Mineralogie-Petrologie und Geochemie, Institut für Geowissenschaften, Altenhöferallee 1, Frankfurt am Main, 60438, Germany
推荐引用方式 GB/T 7714	Incerpi N.,Manatschal G.,Martire L.,et al. Characteristics and timing of hydrothermal fluid circulation in the fossil Pyrenean hyperextended rift system: new constraints from the Chaînons Béarnais (W Pyrenees)[J],2020,109(3).
APA	Incerpi N.,Manatschal G.,Martire L.,Bernasconi S.M.,Gerdes A.,&Bertok C..(2020).Characteristics and timing of hydrothermal fluid circulation in the fossil Pyrenean hyperextended rift system: new constraints from the Chaînons Béarnais (W Pyrenees).International Journal of Earth Sciences,109(3).
MLA	Incerpi N.,et al."Characteristics and timing of hydrothermal fluid circulation in the fossil Pyrenean hyperextended rift system: new constraints from the Chaînons Béarnais (W Pyrenees)".International Journal of Earth Sciences 109.3(2020).