The structure of SW Cornwall and its bearing on the emplacement of the Lizard complex

Rattey, P.R. and Sanderson, D.J. (1984) The structure of SW Cornwall and its bearing on the emplacement of the Lizard complex. Journal of the Geological Society, 141 (1), 87-95. (doi:10.1144/gsjgs.141.1.0087).

Record type: Article

Abstract

Six phases of deformation can be recognized in the Devonian metasediments to the N of the Lizard Complex. The first two phases (D1 & D2) show a variety of orientations and styles, but with a general N or NW vergence. These phases, while representing regional deformation events, are considerably modified by the emplacement of the Lizard Complex. There is a general increase in intensity of both D1 and D2 structures towards the Lizard boundary. This is accompanied by variation in the orientation of both early phases of deformation, leading to a variety of interference patterns. Domains of oblique F1 folds, with axes trending N-S, are developed in the rocks immediately to the NE and NW of the Lizard, and are considered to have formed by differential, NNW-directed thrusting of slabs of the complex during the early regional deformation. D2 produced discrete shear zones ahead and below the Lizard rocks and may have resulted from the gravitational collapse of the D1 nappes. The D3 deformation post-dates the Lizard emplacement, being related to the Cornubian batholith. Subsequent phases represent essentially post-batholith, and hence post-Lizard emplacement, deformation

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