Zobrazeno 1 - 10 of 13 pro vyhledávání: '"J. W. Gaskarth"'
1
The Great Glen Fault: a major vertical lithospheric boundary
Autor: P. J. Henney, P. van Calsteren, J. W. Gaskarth, A. Swarbrick, M. A. Morrison, J. C. Canning
Publikováno v: Journal of the Geological Society. 155:425-428
Two lamprophyre suites are used to constrain sub-continental lithospheric mantle domains in Late Caledonian Northern Britain (at 400 Ma). A Northern Highlands and a Southern domain are resolved. The first has low (ɛNd (−6.4 to − 12.8); the latte
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a395a33c6619903de16b255f60aedc26
https://doi.org/10.1144/gsjgs.155.3.0425
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2
Geochemistry of late Caledonian minettes from Northern Britain: implications for the Caledonian sub-continental lithospheric mantle
Autor: J. W. Gaskarth, P. J. Henney, Jason C. Canning, M. A. Morrison
Publikováno v: Mineralogical Magazine. 60:221-236
The geochemistry of late Caledonian minettes from across the orogenic belt is compared in order to constrain the composition of the Caledonian sub-continental lithospheric mantle (SCLM). All the minettes are similar petrographically and chemically an
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4b0751a39d9571082aa9f646f93aadc1
https://doi.org/10.1180/minmag.1996.060.398.15
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3
Composite Ordovician lamprophyre (spessartite) intrusions around the Midlands Microcraton in central Britain
Autor: R. S. Thorpe, P. J. Henney, J. W. Gaskarth
Publikováno v: Geological Magazine. 130:657-663
Lamprophyre sills and dykes of Ordovician age were emplaced within Cambrian–Lower Ordovician sedimentary rocks around the northern margins of the Midlands Microcraton. The intrusions show internal mineralogical and chemical variations indicating em
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::91085ac508a1063ca4e78808894894aa
https://doi.org/10.1017/s0016756800020963
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6
Late Caledonian Dyke-Swarms in Southern Scotland: A Regional Zone of Primitive K-Rich Lamprophyres and Associated Vents
Autor: C. C. Rundle, J. W. Gaskarth, N. M. S. Rock
Publikováno v: The Journal of Geology. 94:505-522
Siluro-Devonian magmatism in the Southern Uplands (Scotland) and Northern Ireland includes a hitherto neglected regional SW-NE zone, c. 10 km wide and >300 km long, of calc-alkaline lamprophyre dykes. Lamprophyres were locally emplaced contemporaneou
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0e914d5d07d607e7bc45fe08af0bb635
https://doi.org/10.1086/629054
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8
Multi-component origin of Caledonian lamprophyres of northern England
Autor: R. Macdonald, R. S. Thorpe, J. W. Gaskarth, A. R. Grindrod
Publikováno v: Mineralogical Magazine. 49:485-494
Mafic lamprophyre dykes in northern England were emplaced soon after the final closure of the Iapetus Ocean at the end of the Caledonian orogeny. High Mg/(Mg+Fe) ratios and Cr and Ni contents are consistent with equilibrium with mantle peridotite. In
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2d13d0c5790a9279d2d4d5afab4d0af0
https://doi.org/10.1180/minmag.1985.049.353.01
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9
Late Caledonian dyke-swarms in Southern Scotland: New field, petrological and geochemical data for the Wigtown Peninsula, Galloway
Autor: R. P. Barnes, N. M. S. Rock, J. W. Gaskarth
Publikováno v: Geological Journal. 21:101-125
Several hundred, dominantly NE-trending dykes invade Silurian flysch sediments of the Wigtown Peninsula. The most basic dykes are K-rich biotite-lamprophyres, hornblende-lamprophyres and appinites ('diorites' of previous maps). More acidic (qz and cm
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::86bd9fa603ae14c1b6c0dc903c24d061
https://doi.org/10.1002/gj.3350210203
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10
Late Caledonian subvolcanic vents and associated dykes in the Kirkcudbright area, Galloway, south-west Scotland
Autor: N. M. S. Rock, C. Cooper, J. W. Gaskarth
Publikováno v: Proceedings of the Yorkshire Geological Society. 46:29-37
SUMMARY Two small ( Late Caledonian (Siluro-Devonian: 400 – 418Ma) age, forming a cluster unique in southern Scotland. They comprise vughy, greywacke/mudstone agglomerate with a highly altered, lamprophyric -basaltic to non-igneous (silica-rich) ma
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::17e6eec0db4a322afa02e96033dc38e6
https://doi.org/10.1144/pygs.46.1.29
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