A gravity survey of the Cairnsmore of Fleet granite and its environs

Parslow, G.R.; Randall, B. A. O.

doi:10.1144/sjg09030219

Cited by 7 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2a). The Cairnsmore of Fleet Granite is a deep-seated body (Parslow & Randall, 1973;Dawson et al 1977) which generally has a low magnetic susceptibility, except for a weakly magnetic marginal phase most evident on its eastern flank. If shallow magnetic basement was punctured by such a body there would be an associated, pronounced magnetic low; the observed influence of the granite is in fact relatively weak, and was interpreted by Powell (1970) as indicating only limited interaction between the base of the granite and the top of the magnetic basement at mid-crustal depths.…”

Section: A the Galloway Magnetic Highmentioning

confidence: 99%

See 1 more Smart Citation

Crustal magnetization variations across the Iapetus Suture Zone

Kimbell

Stone

1995

Geol. Mag.

View full text Add to dashboard Cite

The Iapetus Suture (Solway) line coincides with a magnetic low, which lies between magnetic highs over southwestern Scotland and the Lake District-Isle of Man region. Although topography on deep magnetic basement can account for these long wavelength geophysical variations, an explanation which involves lateral basement magnetization contrasts is preferred on the basis of (a) correlations between inferred magnetization boundaries and major structures delineated from other evidence, and (b) the apparent westward continuation of the Solway low through Ireland and Newfoundland across areas with very different subsidence histories but similar position with respect to the collision of Laurentia and Avalonia. In the preferred model, relatively

show abstract

Section: A the Galloway Magnetic Highmentioning

confidence: 99%

“…Parslow & Randall, 1973;Dawson et al 1977) and can be accommodated by, for example, assuming that the density of the country rock increases with depth while the granite density remains relatively unchanged.…”

Section: A Profile Imentioning

confidence: 99%

Crustal magnetization variations across the Iapetus Suture Zone

Kimbell

Stone

1995

Geol. Mag.

View full text Add to dashboard Cite

show abstract

“…In addition to the large dataset of zircon ages from the Grampian and Northern Highlands terranes compiled by Oliver et al (2008), we include the following data sets; a) additional ages from the Northern Highlands terrane given by Goodenough et al (2011) and Kocks et al 2014, b) an age from the Lorn Lavas in the Grampian Terrane from Neilson et al (2009), c) recently acquired zircon ages from the Trans-Suture granites (Miles et al, 2014), and d) ages of plutons from the extension of each terrane into Ireland (from Chew & Stillman, (Parslow and Randall, 1973;Rollin, 1984;Emenike, 1986;Kimbell et al, 2010). Furthermore, a number of these gravity studies suggest that most plutons are steep-sided.…”

Section: Methodology For Displaying Age Distributionsmentioning

confidence: 99%

“…Assuming an average depth of 12 km for most plutons (e.g. Parslow and Randall, 1973;Rollin, 1984;Emenike, 1986;Kimbell et al, 2010), the rates of magma emplacement were of the order of 10 km 3 /m.y/km between c. 430 and 400 Ma. We note that Neilson et al (2009) suggest that considerable volumes of volcanic rocks from this period have been eroded and that rates of magma emplacement may therefore have exceeded this estimate of 10 km 3 /m.y/km.…”

Section: Post-subduction Magmatism (425 -390 Ma)mentioning

confidence: 99%

Tectonic controls on post-subduction granite genesis and emplacement: The late Caledonian suite of Britain and Ireland

2016

View full text Add to dashboard Cite

Rates of magma emplacement commonly vary as a function of tectonic setting. The late Caledonian granites of Britain and Ireland are associated with closure of the Iapetus Ocean and were emplaced into a varying regime of transpression and transtension throughout the Silurian and into the early Devonian. Here we evaluate a new approach for examining how magma volumes vary as a function of tectonic setting. Available radiometric ages from the late Caledonian granites are used to calculate probability density functions (age spectra), with each pluton weighted by outcrop area as a proxy for its volume. These spectra confirm an absence of magmatic activity during Iapetus subduction between c. 455 Ma and 425 Ma and a dominance of post-subduction magmas between c. 425 Ma and 380 Ma. We review possible reasons why, despite the widespread outcrop of the late Caledonian granites, magmatism appears absent during Iapetus subduction. These include shallow angle subduction or extensive erosion and tectonic removal of the arc.In contrast to previous work we find no strong difference in the age or major element chemistry of post-subduction granites across all terranes. We propose a common causal transpression reduced and eventually suppressed magma emplacement.

show abstract

“…Gravity anomalies detected over the CDGP (Bott and Masson-Smith 1960) and the Cairnsmore of Fleet pluton (Parslow and Randall 1973) indicate considerable density deficits. These has been explained by erosion of the upper granitic roof to the extent of 1-1.5 km in the Cairnsmore of Fleet example.…”

Section: Pluton Emergence and Palaeo-slope Developmentmentioning

confidence: 98%

Landscape evolution of the granitic Criffel–Dalbeattie hills, south-west Scotland

Ringrose

Cassidy

2021

Scottish Geographical Journal

View full text Add to dashboard Cite

This paper examines the geomorphological evolution of the Criffel-Dalbeattie granitic pluton (CDGP). Research is based on data from Shuttle Radar Topography Mission, Google Earth, Ordnance Survey maps and field measurements. Granitic emplacement into Southern Uplands terrain along Caledonian structural trends took place during the mid-late Devonian. Faulting and subsidence during the late Palaeozoic and Mesozoic preceded assumed differential uplift of the pluton during the early Palaeocene. This led to the development of bidirectional palaeo-surfaces. Structural rather than lithological controls formed the dominant bases for subsequent weathering during the Palaeogene and Neogene. Shallow surface weathering over the CDGP and absence of saprolite imply that weathering episodes may have been relatively short-lived. However, joint enlargement and in situ eroded corestones indicate that earlier weathered features were substantially modified by glacial agencies. Pleistocene glacial events included ice streaming from the NNW which took place over moulded hills. Thinner late-stage ice scoured irregular hill long profiles while divergent ice contributed to basin erosion. Localised resurgent ice streaming was short lived. After early uplift and palaeo-surface formation, the CDGP hills evolved through phases of granitic weathering and glacial erosion likely over the past 65 Ma since the early Palaeocene.

show abstract

A gravity survey of the Cairnsmore of Fleet granite and its environs

Cited by 7 publications

References 23 publications

Crustal magnetization variations across the Iapetus Suture Zone

Crustal magnetization variations across the Iapetus Suture Zone

Tectonic controls on post-subduction granite genesis and emplacement: The late Caledonian suite of Britain and Ireland

Landscape evolution of the granitic Criffel–Dalbeattie hills, south-west Scotland

Contact Info

Product

Resources

About