Tethyan oceans

Stampfli, Gérard M.

doi:10.1144/gsl.sp.2000.173.01.01

Cited by 353 publications

(192 citation statements)

References 73 publications

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“…The Alpine Tethys gradually opened throughout the Jurassic period in the W Mediterranean area (Stampfli, 2000;Masini et al, 2013, and references therein). In the W-most areas (Iberian plate), the consequences were only minimal sea level fluctuations and ephemeral emersion times.…”

Section: Relationships Between the Sardinia-corsica Block And Surrounmentioning

confidence: 99%

“…During the Bathonian-Bajocian, the Brianconnais domain formed an elongated SW/NE-risen tectonic structure (Stampfli, 2000), as well as the E Sardinia -Corsica high. A Bathonian tectonic extensional phase is evidenced here by Bertok et al (2011).…”

Section: Relationships Between the Sardinia-corsica Block And Surrounmentioning

confidence: 99%

“…This unconformity, named the "Alpine Tethyan unconformity" herein, tops Variscan Cambrian to Early Carboniferous metamorphic rocks (Carmignani et al, 1994(Carmignani et al, , 2001, and less commonly Triassic (Costamagna and Barca, 2002) and Permian (Cassinis and Ronchi, 2002) sedimentary deposits. The age and causes of this unconformity is coeval to the Jurassic opening of the Alpine Tethys in the W Mediterranean area (Abbate et al, 1986;Bernoulli and Jenkyns, 1974;Stampfli, 2000) an thus can be considered related to it.…”

Section: Introductionmentioning

confidence: 99%

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The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Costamagna

2016

Journal of Iberian Geology

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Investigations performed along the Middle Jurassic Alpine Tethyan unconformity surface of E Sardinia evidenced an elaborate surface that developed over older Late Paleozoic to Triassic rocks. This surface is covered by the Middle Jurassic Genna Selole Fm, which has different sedimentological and petrographical characteristics and thicknesses according to its location and the morphology and evolution of the lower substrate.An analysis of the unconformity and the rocks located above and below it revealed that a tectonic high emerged early during the Middle Jurassic from E Sardinia to Corsica in response to the extensional tectonics leading to the Alpine Tethys opening. This high was almost immediately fragmented in secondary blocks, and an irregular morphology of minor lows and highs thus formed upon it. The high was, on the whole, subjected to strong erosion. Its deposits accumulated along the rims of the high and in the lows of its surface, smoothing the landscape and preparing it for the marine transgression that followed. The tectonic high rapidly collapsed starting from its North side as show the older age of the marine deposits first investigated.A similar rise-and-collapse tectosedimentary evolution can be seen in some of the W Mediterranean domains next to the Sardinia-Corsica block. Indeed, they are all related to the Alpine Tethys opening and may mark a discontinuous high separating the Paleoeuropa from the Tethyan domain. Consequently, a comparison with all of these domains has been attempted by trying to set the Sardinia-Corsica block in this extensional margin scenario.Keywords: Alpine Tethys, Unconformity, Jurassic, Paleogeography, Sedimentology, Eastern Sardinia-Corsica Tectonic high ResumenInvestigaciones llevadas a cabo en la superficie discordante del Jurásico Medio del Tetis alpino evidencia que esta superficie está muy elaborada y se desarrolló sobre rocas que abarcan desde un registro Paleozoico Superior a Triásico. Esta superficie está cubierta por la Fm Genna Selole, de edad Jurásico Medio, que tiene diferentes características sedimentológicas y petrológicas y una potencia que depende de su localización y la morfología y evolución del substrato inferior.Un análisis de esta discordancia y de las rocas localizadas por encima y debajo de la misma revela que hubo un importante alto tectónico in etapas iniciales del Jurásico Medio que afectaba desde el E de Cerdeña a Córcega en respuesta a una tectónica extensional relacionada con la apertura del Tetis alpino. Esta área elevada fue rápidamente fragmentada en bloques desarrollándose una morfología de zonas altas y deprimidas previa a la transgresión marina que llegó seguidamente. Por los datos que muestran los primeros registros marinos se puede deducir que la fragmentación del citado alto tectónico se inició por su parte norte. Una evolución similar en zonas altas y bajas puede observarse igualmente en otras zonas del Mediterráneo occidental próximas al bloque de Córcega-Cerdeña. De hecho, todas ellas están relacionadas con la apertura de...

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Section: Relationships Between the Sardinia-corsica Block And Surrounmentioning

confidence: 99%

Section: Relationships Between the Sardinia-corsica Block And Surrounmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Costamagna

2016

Journal of Iberian Geology

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“…One of the most studied collisional orogens is the Tethyan belt (Şengör & Kidd, 1979;Turner et al 1996;Gao et al 2010) extending from the Alps to the Himalayas. Large portions of this belt are characterized by complex collisional processes involving continental blocks that were separated from the northern Gondwana margin (Stocklin, 1974;Berberian & King, 1981;Stampfli, 2000). The Zagros orogenic belt, which extends for more than 2000 km in Central Iran (Alavi, 2004), is among the most interesting portions of this huge tectonic belt.…”

Section: Post-collisional Shaivar Dagh Pluton Iranmentioning

confidence: 99%

Post-collisional polycyclic plutonism from the Zagros hinterland: the Shaivar Dagh plutonic complex, Alborz belt, Iran

et al. 2011

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-The petrological and geochronological study of the Cenozoic Shaivar Dagh composite intrusion in the Alborz Mountain belt (NW Iran) reveals important clues to decipher complex relations between magmatic and tectonic processes in the central sectors of the Tethyan (Alpine-Himalayan) orogenic belt. This pluton is formed by intrusion at different times of two main magmatic cycles. The older (Cycle 1) is formed by calc-alkaline silicic rocks, which range in composition from diorites to granodiorites and biotite granites, with abundant mafic microgranular enclaves. The younger cycle (Cycle 2) is formed by K-rich monzodiorite and monzonite of marked shoshonitic affinity. The latter form the larger volumes of the exposed plutonic rocks in the studied complex. Zircon geochronology (laser ablation ICP-MS analyses) gives a concordia age of 30.8 ± 2.1 Ma for the calc-alkaline rocks (Cycle 1) and a range from 23.3 ± 0.5 to 25.1 ± 0.9 Ma for the shoshonitic association (Cycle 2). Major and trace element relations strongly support distinct origins for each magmatic cycle. Rocks of Cycle 1 have all the characteristic features of active continental margins. Shoshonitic rocks (Cycle 2) define two continuous fractionation trends: one departing from a K-rich basaltic composition and the other from an intermediate, K-rich composition. A metasomatized-mantle origin for the two shoshonitic series of Cycle 2 is proposed on the basis of comparisons with experimental data. The origin of the calc-alkaline series is more controversial but it can be attributed to processes in the suprasubduction mantle wedge related to the incorporation of subducted mélanges in the form of silicic cold plumes. A time sequence can be established for the processes responsible of the generation of the two magmatic cycles: first a calc-alkaline cycle typical of active continental margins, and second a K-rich cycle formed by monzonites and monzodiorites. This sequence precludes the younger potassic magmas as precursors of the older calc-alkaline series. By contrast, the older calc-alkaline magmas may represent the metasomatic agents that modified the mantle wedge during the last stages of subduction and cooked a fertile mantle region for late potassic magmatism after continental collision.

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“…The Ordovician collision of the detaching terranes with Gondwana triggered the consumption of the embryonic eastern Rheic ocean and the amalgamation of volcanic arcs and continental ribbons with Gondwana in a rather short-lived orogenic pulse (von Raumer, 1998, with references therein). The cordillera, resulting from mid-ocean ridge subduction during the Ordovician, started to collapse already during the Late Ordovician leading to the opening of the Paleo-Tethys rift, followed by the Late Silurian drift of the composite Hun-superterrane (Stampfli, 2000).…”

Section: Separation From Gondwanamentioning

confidence: 99%

Gondwana-derived microcontinents — the constituents of the Variscan and Alpine collisional orogens

2003

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The European Variscan and Alpine mountain chains are collisional orogens, and are built up of pre-Variscan ''building blocks'' which, in most cases, originated at the Gondwana margin. Such pre-Variscan elements were part of a preOrdovician archipelago-like continental ribbon in the former eastern prolongation of Avalonia, and their present-day distribution resulted from juxtaposition through Variscan and/or Alpine tectonic evolution. The well-known nomenclatures applied to these mountain chains are the mirror of Variscan resp. Alpine organization. It is the aim of this paper to present a terminology taking into account their pre-Variscan evolution at the Gondwana margin. They may contain relics of volcanic islands with pieces of Cadomian crust, relics of volcanic arc settings, and accretionary wedges, which were separated from Gondwana by initial stages of Rheic ocean opening. After a short-lived Ordovician orogenic event and amalgamation of these elements at the Gondwanan margin, the still continuing Gondwana-directed subduction triggered the formation of Ordovician Al-rich granitoids and the latest Ordovician opening of Palaeo-Tethys. An example from the Alps (External Massifs) illustrates the gradual reworking of Gondwana-derived, pre-Variscan elements during the Variscan and Alpine/ Tertiary orogenic cycles.

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Tethyan oceans

Abstract: Diachronous subsidence patterns of Tethyan margins since the Early Palaeozoic provide constraints for paleocontinental reconstructions and the opening of disappeared oceans.

Cited by 353 publications

References 73 publications

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Post-collisional polycyclic plutonism from the Zagros hinterland: the Shaivar Dagh plutonic complex, Alborz belt, Iran

Gondwana-derived microcontinents — the constituents of the Variscan and Alpine collisional orogens

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