The Lustleigh Fault in North-East Dartmoor

Blyth, F. G. H.

doi:10.1017/s0016756800068722

Cited by 15 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the basin shape elucidated by the gravity survey suggests a more asymmetrical structure with the major line of weakness down the western side of the basin. This western fault has a similar strike orientation to the fault to the east of Lustleigh marked by Blyth (1957) and is also similar in orientation to some of the faults marked in the Devonian rocks on the 1 inch map (Sheet 339). It thus seems probable that this fault is a further reflection of the general trend of NNW-SSE faulting in this area.…”

Section: Discussionmentioning

confidence: 63%

“…This led Reid to postulate that the Bovey basin was a rift valley in which subsidence had taken place during the deposition of the beds. Blyth (1957) and Dearman (1963) have suggested that the Lustleigh-Sticklepath transcurrent fault, which produces a displacement of 1.3 km in the Dartmoor granite near Lustleigh (see Fig. 1), may extend southwards into the Bovey basin and be the cause of this subsidence.…”

Section: Introductionmentioning

confidence: 99%

“…Geological map of the Bovey Tracey area taken from the 1 inch Geological Survey Sheet 339, and fromBlyth (1957).…”

mentioning

confidence: 99%

See 2 more Smart Citations

A gravity survey of the Bovey Tracy basin, Devon

Fasham

1971

Geol. Mag.

View full text Add to dashboard Cite

A detailed gravity survey, carried out to determine the thickness of the Bovey Tracey beds, is described. After removal of the regional gradient a residual gravity anomaly of -15 mgal can be attributed to the Bovey beds. This has been interpreted assuming that the clay density increases with depth and a maximum Bovey bed thickness of 1245 m is predicted. The western contact of the basin is shown to be faulted with dips of up to 63° and is possibly an extension of the Lustleigh-Sticklepath fault system.

show abstract

Section: Discussionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A gravity survey of the Bovey Tracy basin, Devon

Fasham

1971

Geol. Mag.

View full text Add to dashboard Cite

show abstract

“…It is commonly accepted that the major NW-SE trending strike-slip faults which cut the Variscan basement of south-west England originated in the Variscan Orogeny (Blyth 1957(Blyth , 1962Dearman 1963;Freshney et al 1979), probably with a dextral sense of movement. Webby (1965a, b ) concluded that major dextral movements on the NW-SE Timberscombe, Monksilver and Cothelstone Faults (about 60 km NE of the SLFZ in the Crediton Trough) were mainly pre-Permian, with one branch of the Timberscombe Fault being covered by unfaulted Permo-Triassic sediments.…”

Section: Variscan Dextral Offsets Across the Sticklepath-lustleigh Famentioning

confidence: 99%

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

Holloway

Chadwick

1986

JGS

View full text Add to dashboard Cite

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.

show abstract

“…On Dartmoor, a complex series of erosional cycles has been reconstructed to explain the landforms of the southern part of the massif (Orme, 1963). All are of late Cainozoic age, and though the details of interpretation are probably invalidated by the recognition of significant late geological faulting in the massif (Blyth, 1957(Blyth, , 1962Dearman, 1963Dearman, , 1964 considerable erosion clearly occurred during this period. But it has long been recognised that erosion exposed, or nearly exposed, the crystalline pluton by the end of the Mesozoic, possibly by the Lower Cretaceous (see, for example, Smith, 1961;Hutchins, 1963), and the importance of the sub-Cretaceous land surface as a significant element of the present landscape has been increasingly recognised (Simpson, 1964).…”

Section: Arguments Against the Pressure Release Hypothesismentioning

confidence: 99%

Structural Landforms: Landforms Associated with Granitic Rocks, Faults, and Folded Strata

Twidale¹

1972

The Geographical Journal

View full text Add to dashboard Cite

The production of any book involves far more than its writing. It entails much tedious and painstaking work, and I wish to take this opportunity to thank those several persons who, directly or in directly, and in numerous ways, have helped with the preparation of Structural Landforms. Many colleagues and friends have kindly supplied photographs, many of which, for reasons of space, have not been utilised. Only one request for illustrative material was directly refused, and, whether the prints supplied were used or not, I wish to thank those who went to so much trouble on my behalf. I am grateful to the many organisations and individuals who kindly gave permission to use photographs and illustrations, and whose assistance is acknow ledged in the text. Janet Saies and Janeen Nicol read the first draft, justifying their interest with the modest claim that if they could understand the text then anyone could. They could not follow all of it, and I am grateful to them for drawing my attention to ambiguous and con fused passages, for their expenditure of time, and their humour and enthusiasm. Tim Hopwood has drawn my attention to certain anachronisms in my use of structural terms, and George Sved has, over the years, done much to disembarrass my mind of some, though I fear not all, mechanically unsound ideas. Yngvar Isaacson and Bruce Curtis have generously made available their expert knowledge of certain North American areas, and I have profited greatly from discussion of particular problems in structural geomor phology with Jim Talbot, Edwin Hills, Rudi Horwitz, Armin Öpik, and Heli Wopfner. The onerous task of translating my rough sketches into line draw ings fell to John Heyward, of the Department of Human Geography, Institute of Advanced Studies, Australian National University. Apart from the field sketches, he is responsible for all the figures, and the skill and flair he has brought to his task are obvious to all. ix X Acknowledgments To John and to his superiors, who so generously and understand ing^ allowed me the use of his services, I am most grateful. My wife, Kate, quite apart from encouraging me to continue with the writing of the book in the face of more than usually difficult and trying circumstances, with her customary skill, patience and instinct, deciphered my scrawl, unravelled my amendments, and from it all produced a typescript. I am the more appreciative of her help because I know how difficult it was for her to fit in the typing between running a household, caring for a family, and sundry other good works. Most of all, however, I must express my gratitude to the General Editor of this series, J. N. Jennings. Joe has for many years now given me much help and good advice, but never so much as in the preparation of this book. For providing the opportunity to par ticipate in the series, for his liaison work between author and draftsman, for his tact, patience, encouragement, and understanding, for his many helpful suggestions, and, most of all, for his scholarly and critical mind, I thank him.

show abstract

The Lustleigh Fault in North-East Dartmoor

Cited by 15 publications

References 3 publications

A gravity survey of the Bovey Tracy basin, Devon

A gravity survey of the Bovey Tracy basin, Devon

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

Structural Landforms: Landforms Associated with Granitic Rocks, Faults, and Folded Strata

Contact Info

Product

Resources

About