Evolution of an eclogitized continental fragment in the Eastern Alps (Sieggraben, Austria)

Putiš, Marián; Korikovsky, S. P.; Wallbrecher, E.; Unzog, Wolfgang; Olesen, Niels Ø.; Fritz, Harald

doi:10.1016/s0191-8141(01)00071-2

Cited by 13 publications

(6 citation statements)

References 34 publications

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“…9B). The prograde path until it reached eclogite facies and subsequent uplift followed a clockwise trajectory intermediate between those observed in Franciscan-type HP suites (e.g., Ernst, 1977Ernst, , 1988 and those resulting from continent-continent collisions like those of the Alps (e.g., Tropper et al, 1999;Cartwright and Barnicoat, 2002;Putis et al, 2002). Paths similar to that of the Xayacatlán suite have been obtained from New Caledonia and Western Liguria ( Fig.…”

Section: P-t-t Paths and Tectonic Setting Of Metamorphismmentioning

confidence: 64%

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Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlan Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans

Vega-Granillo¹,

Talavera-Mendoza

Meza-Figueroa³

et al. 2007

Geological Society of America Bulletin

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New thermobarometric and U/Pb and 40Ar/ 39 Ar geochronologic data coupled with ages obtained from the Acatlán Complex, the basement of the Mixteco terrane of southern Mexico, reveal the existence of three distinctive high-pressure metamorphic events of early to middle Paleozoic age, each recorded in a separate lithological suite. Xayacatlán suite eclogites with oceanic affi nity underwent peak metamorphism at 609-491 °C and 13-12 kb during the Early Ordovician (ca. 490-477 Ma, U-Pb zircon), followed by a partial overprint at 600 °C and ~9.6 kb and then at 500 °C and ~6.7 kb. An overprinting event at 525-500 °C and ~9.5 kb is ascribed to the Devonian. The pressure-temperature (P-T) path of the Xayacatlán suite indicates a subduction-exhumation process followed by tectonically related reburial. Ixcamilpa suite blueschists with oceanic affi nity underwent epidote-blueschist metamorphism (T, 200-390 °C; P, 6-9 kb) and then epidoteamphibolite (T, 390-580 °C; P, 9-6 kb) events ascribed to the Late Ordovician-Early Silurian. Esperanza suite eclogites with continental affi nity underwent peak metamorphism at 830-730 °C and 17-15 kb. Amphibole from eclogite yields a 430 ± 5 Ma 40 Ar/ 39 Ar age, dating the high-pressure (HP) event. P-T paths of high-temperature (HT) eclogites like those of the Esperanza suite have been related to the collision of continental blocks. Partial overprinting occurred at 690-640 °C and 14-10 kb prior to 374 ± 2 Ma ( 40 Ar/ 39 Ar, phengite). The three HP suites were tectonically juxtaposed at different times before the Mississippian Period, resulting in the closure of the Iapetus Ocean. Phengite 40 Ar/ 39 Ar geochronology reveals the existence of a widespread tectonothermal event between 345 and 323 Ma, which may be related to the juxtaposition of the HP-composed block and the Gondwanan-affi nity Cosoltepec suite, causing the closure of the Rheic Ocean. The tectonothermal events in the Acatlán Complex coincide in time, physical conditions, and tectonic setting with events in the Appalachian-Caledonian orogen, suggesting their relation. On that basis the geology of the Acatlán Complex can lead to a more comprehensive understanding of the tectonic evolution of the Appalachian orogen and of the Gondwana-Laurentia interactions preceding the Pangean assembly.

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Section: P-t-t Paths and Tectonic Setting Of Metamorphismmentioning

confidence: 64%

“…9A). In these regions, eclogitization is inferred as having resulted from the collision of continental blocks or microblocks (e.g., Ernst, 1977;Cuthbert and Carswell, 1990;Putis et al, 2002;Puelles et al, 2005;Shervais et al, 2003).…”

Section: P-t-t Paths and Tectonic Setting Of Metamorphismmentioning

confidence: 99%

Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlan Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans

Vega-Granillo¹,

Talavera-Mendoza

Meza-Figueroa³

et al. 2007

Geological Society of America Bulletin

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“…Previous field studies based on present exposures of past high‐pressure nappes permit to unravel that their geometry is as well sheet‐like, with estimated thickness usually below 5 km [e.g., Ernst , 2001; Aoya et al , 2002]. Their internal geometry, however, is poorly known as regards the structures formed at the deepest realms, since most often, a pervasive retrometamorphic overprint erases and/or transposes earlier structures [e.g., Henry et al , 1993; Martínez‐Catalán et al , 1996; Engvik and Andersen , 2000; Miller et al , 2002; Putis et al , 2002]. These circumstances make the Cabo Ortegal complex a remarkable example of a high‐pressure terrain.…”

Section: Discussionmentioning

confidence: 99%

Structural assemblage of high‐pressure mantle and crustal rocks in a subduction channel (Cabo Ortegal, NW Spain)

2003

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[1] High-pressure metamorphic fold-nappes and ductile thrusts occur in the Cabo Ortegal upper allochthons. They involve arc-root lithospheric mantle peridotites, high-pressure volcanic-arc granulites, normal mid-oceanic ridge basalt eclogites and shallow crustal volcanosedimentary high-pressure gneiss units. Confluence of units from such disparate tectonic settings occurred at an eo-Hercynian convergent plate margin. Their internal deformation, juxtaposition, and high-pressure synmetamorphic reworking resulted from kinematically simple but intense and polyphase ductile deformations. Fold nappes exhibit a remarkable sheathlike form and contain mineral and stretching lineations defined by high-pressure mineral assemblages subparallel to fold axes. We argue that these structures outline the internal organization of high-pressure sheets at deep tectonic realms of an oblique subduction/ collision orogenic channel.

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“…The most immobile elements appear to be Si, Ti and Al (Putiš et al , 1997a). The basement mylonites reflect deformational conditions of ~400–500°C at depths of 20–25 km (Putiš, 1994; Putiš et al , 1997a, 1997b). The exhumation age of the granitoid rocks has been determined from the newly formed phengite at ~100−85 Ma (Maluski et al , 1993; Dallmeyer et al , 1993, 1996; Putiš et al , 2009b).…”

Section: Geological Settingmentioning

confidence: 99%

Hellandite-(Y)–hingganite-(Y)–fluorapatite retrograde coronae: a novel type of fluid-induced dissolution–reprecipitation breakdown of xenotime-(Y) in the metagranites of Fabova Hoľa, Western Carpathians, Slovakia

Ondrejka

Molnárová

Putiš

et al. 2022

MinMag

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Evolution of an eclogitized continental fragment in the Eastern Alps (Sieggraben, Austria)

Cited by 13 publications

References 34 publications

Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlan Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans

Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlan Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans

Structural assemblage of high‐pressure mantle and crustal rocks in a subduction channel (Cabo Ortegal, NW Spain)

Hellandite-(Y)–hingganite-(Y)–fluorapatite retrograde coronae: a novel type of fluid-induced dissolution–reprecipitation breakdown of xenotime-(Y) in the metagranites of Fabova Hoľa, Western Carpathians, Slovakia

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