The emplacement of peridotites and associated oceanic rocks from the Lizard Complex, southwest England

Cook, Craig; Holdsworth, R. E.; Styles, M. T.

doi:10.1017/s0016756801005933

Cited by 27 publications

(27 citation statements)

References 48 publications

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“…SHRIMP U-Pb ages of c. 500 Ma from zircons in rare metasedimentary rocks are similar to those in pre-rift basement [17,69]. An early high temperature (550-700 °C, 2-6 kbar) prograde 4 brown amphibole fabric, dated at 393-386 Ma by SHRIMP U-Pb metamorphic zircon also exhibits kinematic similarity with the mylonitic peridotites [19,69].…”

Section: Lizard Complexsupporting

confidence: 51%

“…The mafic and ultramafic rocks of the Traboe Cumulate Complex [55] are interlayered with the mylonitic peridotites and record the same fabric [18,19]. Cambro-Ordovician zircon cores imply proximity to pre-rift basement [69].…”

Section: Lizard Complexmentioning

confidence: 96%

“…Quartz-feldspar-amphibole veins developed during granulite facies partial melting have yielded a magmatic U-Pb zircon age of 397 ± 2 (2σ) Ma (late Emsian) [16]. In the south and west, the mantle peridotites are underlain by the Landewednack Amphibolites; their protoliths are inferred to be basalts, dolerite dykes and minor gabbros that have a similar MORB geochemistry to the Crousa Gabbro [19,37]. SHRIMP U-Pb ages of c. 500 Ma from zircons in rare metasedimentary rocks are similar to those in pre-rift basement [17,69].…”

Section: Lizard Complexmentioning

confidence: 99%

“…In the Lizard Complex, the boundary between mantle peridotites and the underlying Landewednack Amphibolites is formed by gently dipping amphibolite facies shear zones that have a top sense of shear to the NW [19]. Deformed, variably commingled and mixed, mafic and felsic igneous rocks (Kennack Gneiss) intrude the boundary zone [11,82].…”

Section: Onset Of Convergence and Accretion Of The Distal Passive Marginmentioning

confidence: 99%

“…It has substantially refined understanding and models of passive margin evolution, Variscan convergence and post-Variscan sedimentation, e.g. [18,19,29,35,37,[58][59][60]69]. In addition, extensional reactivation of the Rhenohercynian suture zone and inverted passive margin has been interpreted to exert a significant control on Early Permian magmatism and sedimentary basin development [46,[88][89][90].…”

Section: Introductionmentioning

confidence: 99%

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The Rhenohercynian passive margin of SW England: Development, inversion and extensional reactivation

Shail

Leveridge

2009

Comptes Rendus. Géoscience

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Section: Lizard Complexsupporting

confidence: 51%

Section: Lizard Complexmentioning

confidence: 96%

Section: Lizard Complexmentioning

confidence: 99%

Section: Onset Of Convergence and Accretion Of The Distal Passive Marginmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Rhenohercynian passive margin of SW England: Development, inversion and extensional reactivation

Shail

Leveridge

2009

Comptes Rendus. Géoscience

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The significance of Late Devonian ophiolites in the Variscan orogen: a record from the Vosges Klippen Belt

Skrzypek

Tabaud

Edel

et al. 2011

Int J Earth Sci (Geol Rundsch)

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The present work examines the lithological, structural, geochemical and geochronological records from the Klippen Belt located in the southern Vosges Mountains (NE France). The Klippen Belt is represented by discontinuous exposures of serpentinized harzburgite, ophicalcite, gabbro, gneiss and polymictic conglomerate overlain by deep marine pelitic sediments. Structural data and Bouguer anomalies reveal that the Klippen Belt coincides with a significant discontinuity now occupied by a granitic ridge. Gabbro geochemistry indicates a MORtype affinity similar to recent slow-spreading ridges, but positive Ba, Sr, Th or U anomalies do not exclude the influence of fluids expelled from a subduction zone. A Sm-Nd isochron age of 372 ± 18 Ma is thought to reflect gabbro emplacement from a highly depleted mantle source (e Nd = ?11.3), and U-Pb zircon ages from a gneiss sample indicate that the basement found in the Klippen has a Neoproterozoic origin. Combined data indicate the formation of a deep basin during Late Devonian rifting. The Klippen lithologies could testify for the presence of an ocean-continent transition environment subsequently inverted during the Early Carboniferous. Basin inversion during the Middle Visean was probably controlled by rift-related structures, and resulted in folding of the sedimentary successions as well as exhumation along thrust zones of deep parts of the basin represented by the Klippen Belt. Based on correlations with the neighbouring Variscan massifs, it is proposed that the southern Vosges sequences represent a back-arc basin related to the North-directed subduction of the southern Palaeotethys Ocean. This geodynamic reconstruction is tentatively correlated with similar ophiolitic remnants in the northern part of the French Massif Central (Brévenne) and with the evolution of the southern Black Forest. The Late Devonian ophiolites are interpreted as relicts of small back-arc marginal basins developed during general closure of the Palaeozoic subduction systems.

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Highly depleted isotopic compositions evident in Iapetus and Rheic Ocean basalts: implications for crustal generation and preservation

Murphy

Waldron

Schofield

et al. 2013

Int J Earth Sci (Geol Rundsch)

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Subduction of both the Iapetus and Rheic oceans began relatively soon after their opening. Vestiges of both the Iapetan and Rheic oceanic lithospheres are preserved as supra-subduction ophiolites and related mafic complexes in the Appalachian-Caledonian and Variscan orogens. However, available Sm-Nd isotopic data indicate that the mantle source of these complexes was highly depleted as a result of an earlier history of magmatism that occurred before the Iapetus and Rheic Oceans existed. We propose that this oceanic lithosphere was captured from the adjacent Paleopacific lithosphere, in a manner analogous to the Mesozoic-Cenozoic "capture" in the Atlantic realm of the Caribbean plate. The early phase of magmatism rendered this lithosphere more buoyant than surrounding asthenosphere, which facilitated its preservation. This hypothesis may explain the premature closing of the Iapetus Ocean, and the distribution of collisional events and peri-Gondwanan terranes in the Appalachian-Caledonian and Variscan orogens.

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The emplacement of peridotites and associated oceanic rocks from the Lizard Complex, southwest England

Cited by 27 publications

References 48 publications

The Rhenohercynian passive margin of SW England: Development, inversion and extensional reactivation

The Rhenohercynian passive margin of SW England: Development, inversion and extensional reactivation

The significance of Late Devonian ophiolites in the Variscan orogen: a record from the Vosges Klippen Belt

Highly depleted isotopic compositions evident in Iapetus and Rheic Ocean basalts: implications for crustal generation and preservation

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