Mapping the nature of mantle domains in Western and Central Europe based on clinopyroxene and spinel chemistry: Evidence for mantle modification during an extensional cycle

Picazo, Suzanne; Müntener, Othmar; Manatschal, Giänreto; Bauville, Arthur; Karner, Garry D.; Johnson, Christopher

doi:10.1016/j.lithos.2016.08.029

Cited by 87 publications

(116 citation statements)

References 176 publications

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“…This distribution has been interpreted as the ending of the Permian extensional regime at ca. 260–240 Ma, followed by sag‐stage subsidence during slow lithospheric cooling from the Early Triassic (Picazo et al, ; Schuster & Stüwe, ). No relation occurs between T max ages, metamorphic field gradients (Barrovian and Abukuma), and their present‐day distribution through the Alps (Figures and a).…”

Section: Tectonic Evolution and Metamorphic And Magmatic Recordsmentioning

confidence: 99%

“…In the Alps, the transition from rifting to oceanic spreading is marked by the deposition of post‐rift sediments (172–165 Ma; Baumgartner et al, ; Bill, O'Dogherty, Guex, Baumgartner, & Masson, ; Handy et al, ; Stampfli et al, ) and by the exhumation and serpentinization of subcontinental and ocean–continent transition zone mantle (Figure ;e.g., Desmurs, Manatschal, & Bernoulli, ; Manatschal, ; Manatschal & Müntener, ; Picazo et al, ; Rampone et al, ; Tribuzio, Garzetti, Corfu, Tiepolo, & Renna, ). The radiometric ages of the oceanic gabbros and peridotites (Figure a and Table S3) cluster around approximately 160 Ma (Li, Faure, Lin, & Manatschal, ; Mevel, Caby, & Kienast, ; Tribuzio et al, ), with older values of 166–183 Ma from the Apennines, Corsica, and Erro–Tobbio ophiolitic units (Li, Faure, Rossi, Lin, & Lahondère, ; Rampone et al, ; Tribuzio, ).…”

Section: Tectonic Evolution and Metamorphic And Magmatic Recordsmentioning

confidence: 99%

“…The two configurations result from two different interpretations of the pre‐Alpine evolution of the lithosphere. The first one accounts for a thermally perturbed lithosphere consequent to the Permo‐Triassic extension (e.g., Marotta & Spalla, ; Marotta et al, ; Spalla et al, ), while the second one is consequent to a Triassic phase of thermal and mechanical requilibration (Picazo et al, ; Schuster & Stüwe, ).…”

Section: Numerical Modellingmentioning

confidence: 99%

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What drives Alpine Tethys opening? Clues from the review of geological data and model predictions

et al. 2018

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Permo‐Triassic remnants (300–220 Ma) of high‐temperature metamorphism associated with large gabbro bodies occur in the Alps and indicate a high thermal regime compatible with lithospheric thinning. During the Late Triassic–Early Jurassic, an extensional tectonics leads to the break‐up of Pangea continental lithosphere and the opening of Alpine Tethys Ocean (170–160 Ma), as testified by the ophiolites outcropping in the Central–Western Alps and Apennines. We revise geological data from the Permian to Jurassic of the Alps and Northern Apennines, focusing on continental and oceanic basement rocks, and predictions of existing numerical models of post‐collisional extension of continental lithosphere and successive rifting and oceanization. The aim is to test whether the transition from the Permo‐Triassic extensional tectonics to the Jurassic opening of Alpine Tethys occurred. We enforce the interpretation that a forced extension of 2 cm/year of the post‐collisional lithosphere results in a thermal state compatible with the Permo‐Triassic high‐temperature event suggested by pressure and temperature conditions of metamorphic rocks and widespread igneous activity. Extensional or transtensional tectonics is also in agreement with the generalized subsidence indicated by the deposition of sedimentary successions with deepening upward facies occurred in the Alps from the Permian to Jurassic. Furthermore, a rifting developed on a thermally perturbed lithosphere agrees with a hyperextended configuration of the Alpine Tethys rifting and with the duration of the extension necessary to the oceanization. The review supports the interpretation of Alpine Tethys opening developed on a lithosphere characterized by a thermo‐mechanical configuration inherited by the post‐Variscan extension which affected Pangea during the Permian and Triassic. Therefore, a long‐lasting period of active extension can be envisaged for the breaking of Pangea supercontinent, starting from the unrooting of the Variscan belts, followed by the Permo‐Triassic thermal high, and ending with the crustal break‐up and the formation of the Alpine Tethys Ocean.

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Section: Tectonic Evolution and Metamorphic And Magmatic Recordsmentioning

confidence: 99%

Section: Tectonic Evolution and Metamorphic And Magmatic Recordsmentioning

confidence: 99%

Section: Numerical Modellingmentioning

confidence: 99%

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What drives Alpine Tethys opening? Clues from the review of geological data and model predictions

et al. 2018

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“…The Dinaric-Hellenic ophiolites have been mostly originated in SSZ settings during the early-late Jurassic period, e.g., [9,[39][40][41][42][43][44][45][46][47]. Mineral chemistry from the investigated peridotites of Lokris and Beotia ophiolite occurrences reveals a multi-stage genesis in the different types of their host peridotites.…”

Section: Partial Melting and Geotectonic Settingmentioning

confidence: 99%

“…It has a wide range in composition and serves as an important petrogenetic indicator for ultramafic and related rocks [1]. Since the chemical composition of spinels depends on several petrogenetic factors (e.g., crystallization from melt, residue after partial melting with variable degrees, crystallization via melt-peridotite interaction) and physical conditions (pressure, temperature, oxygen fugacity) of the host peridotites, e.g., [2][3][4], they can be correlated with different tectonic settings, e.g., [1,2,[4][5][6][7][8][9][10][11]. Cr-and Al-rich chromites occur usually in the upper-mantle part of the ophiolite pseudosection or close to the crust-mantle boundary, and less commonly in the lowermost oceanic crust.…”

Section: Introductionmentioning

confidence: 99%

Petrogenetic Implications for Ophiolite Ultramafic Bodies from Lokris and Beotia (Central Greece) Based on Chemistry of Their Cr-spinels

Pomonis

Magganas

2017

Geosciences

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Cr-spinels from ultramafic rocks from Lokris (Megaplatanos and Tragana), and Beotia (Ypato and Alyki) ophiolitic occurrences were studied. These rocks comprise principally harzburgite with minor dunite. Small amounts of clinopyroxene-rich harzburgite and lherzolite have been observed along with the harzburgite in Alyki. The Cr# in the studied spinels displays a wide variability. The spinels hosted in harzburgite and cpx-rich harzburgite display low Cr# (<0.6), typical for oceanic (including back-arc basins) ophiolites, whereas the spinels hosted in dunite with Cr# (>0.6) characterize arc-related ophiolitic sequences. Cr-spinels from Alyki indicate a moderate fertile character and are analogous to those from abyssal peridotites. The dunitic and harzburgitic spinel-olivine pairs are consistent with a Supra-Subduction Zone origin. The relatively large range in spinel Cr# and Mg# may have been resulted from a wide range of degrees of mantle melting during the evolution of the host peridotites.

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Subduction and Obduction Processes

Agard

Soret

Bonnet

et al. 2023

Geophysical Monograph Series

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Mapping the nature of mantle domains in Western and Central Europe based on clinopyroxene and spinel chemistry: Evidence for mantle modification during an extensional cycle

Cited by 87 publications

References 176 publications

What drives Alpine Tethys opening? Clues from the review of geological data and model predictions

What drives Alpine Tethys opening? Clues from the review of geological data and model predictions

Petrogenetic Implications for Ophiolite Ultramafic Bodies from Lokris and Beotia (Central Greece) Based on Chemistry of Their Cr-spinels

Subduction and Obduction Processes

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