A gravity survey of the Bovey Tracy basin, Devon

Fasham, M. J. R.

doi:10.1017/s0016756800051141

Cited by 13 publications

(2 citation statements)

References 9 publications

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“…6; Edwards & Freshney 1982), having been covered by younger sediments which spread beyond the original confines of the basin to form a marginal shelf on its eastern side. This postulated eastern master fault is not resolved by the gravity interpretation of Fasham (1971), but leftstepping en kcchelon minor faults (Fig. 3, arrowed) are present along its expected path.…”

Section: Structure Of the Bovey And Petrockstow Basinsmentioning

confidence: 97%

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The Sticklepath-Lustleigh fault zone: Tertiary sinistral reactivation of a Variscan dextral strike-slip fault

Holloway

Chadwick

1986

JGS

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Dextral strike-slip movement on the Sticklepath-Lustleigh fault zone (SLFZ) is indicated by displacements of ?Permian and older rocks. Previous authors have inferred that the main dextral movement which caused these displacements was post-Permian and, noting the presence of small Tertiary pull-apart basins along the fault zone, probably of Tertiary age. However, the geometry of these early Tertiary pull-apart basins indicates sinistral rather than dextral strike-slip movement. We present an alternative model for the history of the Sticklepath-Lustleigh fault zone, summarized below:1. Late Variscan strike-slip movement, with a total displacement of up to 10km, produced the SLFZ and offset dextrally an earlier Variscan thrust.2. Extensional reactivation of this thrust led to rapid Permo-Triassic subsidence in the Crediton Trough and a dextrally offset neighbour, the Hatherleigh outlier.3. Approximately 6 km of early Tertiary sinistral movement on the SLFZ produced small pull-apart sedimentary basins, and reduced the net dextral offset across the fauit. 4.In mid-Tertiarv times, minor dextral movements on the SLFZ may have produced reverse faulting on the margins of the Tertiary basins.

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Section: Structure Of the Bovey And Petrockstow Basinsmentioning

confidence: 97%

“…3). The western margin of the basin is defined by a continuation of, or splay from, the Lustleigh Fault which is mappable at the surface towards its southern end (Edwards 1976) and is interpreted, from gravity data, to dip eastwards at up to 63" (Fasham 1971).…”

Section: Structure Of the Bovey And Petrockstow Basinsmentioning

confidence: 99%