Deformation and emplacement of the Lizard ophiolite complex, SW England, based on evidence from the basal unit

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doi: 10.1144/gsjgs.154.5.0871
Authors:Jones, K. A.
Author Affiliations:Primary:
Oxford Brookes University, Geology & Cartography Division, Oxford, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.154 (Part 5), p.871-885. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1997
Note:In English. 55 refs.; illus., incl. sects., sketch maps
Summary:The basal unit of the Lizard ophiolite preserves evidence of a protracted deformation and accretion history; the earliest recognizable events record the construction of ocean crust and the generation of the Lizard ophiolite in a slow-spreading ridge-axis environment. The initial stages of deformation involved the development of a sub-horizontal crustal-scale shear zone and its progressive deformation by ductile thrusting and folding. Subsequent deformation progressed with the out-of-sequence stacking of ocean lithosphere in which detachment, initiated at mid-crustal levels, culminated in mantle decouplings at thrust slices were derived from progressively deeper crustal levels. The progressive emplacement of a coherent slice of ocean lithosphere over previously accreted units and the generation of a dynamothermal aureole are consistent with models suggesting rapid overthrusting of young ocean lithosphere. The final stage was marked by syn-emplacement extensional collapse and coeval prograde metamorphism and major magma generation. [R.A.H.]
Subjects:Crust; Deformation; Emplacement; Obduction; Oceanic crust; Ophiolite complexes; Orogeny; Paleozoic; Plate tectonics; Structural analysis; Tectonics; Variscan Orogeny; Cornwall England; England; Europe; Great Britain; United Kingdom; Western Europe; Lizard Complex
Abstract Numbers:98M/780
Record ID:1997069248
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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