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Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland.

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Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland. / Macdonald, R.; Fettes, D. J.; Stephenson, D. et al.
In: Scottish Journal of Geology, Vol. 41, No. 2, 2005, p. 159-174.

Research output: Contribution to Journal/MagazineJournal article

Harvard

Macdonald, R, Fettes, DJ, Stephenson, D & Graham, CM 2005, 'Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland.', Scottish Journal of Geology, vol. 41, no. 2, pp. 159-174. https://doi.org/10.1144/0036-9276/01-296

APA

Macdonald, R., Fettes, D. J., Stephenson, D., & Graham, C. M. (2005). Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland. Scottish Journal of Geology, 41(2), 159-174. https://doi.org/10.1144/0036-9276/01-296

Vancouver

Macdonald R, Fettes DJ, Stephenson D, Graham CM. Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland. Scottish Journal of Geology. 2005;41(2):159-174. doi: 10.1144/0036-9276/01-296

Author

Macdonald, R. ; Fettes, D. J. ; Stephenson, D. et al. / Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland. In: Scottish Journal of Geology. 2005 ; Vol. 41, No. 2. pp. 159-174.

Bibtex

@article{beaa1de5f49a471a9fffa9721bd93bac,
title = "Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland.",
abstract = "The Dalradian Supergroup of the Scottish Highlands is a largely metasedimentary succession of Neoproterozoic to Early Cambrian age, metamorphosed during the Caledonian Orogeny. The rocks were deposited on the Laurentian margin during and following the break-up of Rodinia. This rift setting is evidenced, in the upper half of the succession, by the presence of several volcanic sequences. A significant development of these volcanic rocks occurs in the NE Grampian Highlands. There, the Blackwater Formation, within the Argyll Group of the Huntly area, is dominated by basic and ultrabasic metavolcanic rocks, with intercalated metasedimentary rocks. The rocks were metamorphosed in the amphibolite facies, with the Mg contents of their dominant amphiboles apparently reflecting those of the whole-rock protoliths. The protoliths ranged from ultrabasic picritic types (MgO up to 35 wt%) through high-magnesia basalts to basaltic andesites and andesites. The magmas feeding the volcanism were of tholeiitic affinity, broadly similar to metavolcanic rocks elsewhere in the Dalradian. Higher-Nb and lower-Nb groups can be distinguished. The inferred parental magmas were basalts with MgO c. 10 wt%. The ultrabasic rocks formed by accumulation of olivine and minor Cr-spinel within the parental basalts. Some more evolved rocks show evidence of minor (5–10 wt%) accumulation of Fe–Ti oxides. Primary magmas of the Blackwater metavolcanic rocks were generated from a mantle source, or sources, relatively enriched compared to the MORB source. It is speculated that all the Dalradian metavolcanic rocks represent varying degrees of mixing of magmas from this source and a depleted, MORB-like, mantle source.",
author = "R. Macdonald and Fettes, {D. J.} and D. Stephenson and Graham, {C. M.}",
year = "2005",
doi = "10.1144/0036-9276/01-296",
language = "English",
volume = "41",
pages = "159--174",
journal = "Scottish Journal of Geology",
issn = "0036-9276",
publisher = "Geological Society of London",
number = "2",

}

RIS

TY - JOUR

T1 - Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland.

AU - Macdonald, R.

AU - Fettes, D. J.

AU - Stephenson, D.

AU - Graham, C. M.

PY - 2005

Y1 - 2005

N2 - The Dalradian Supergroup of the Scottish Highlands is a largely metasedimentary succession of Neoproterozoic to Early Cambrian age, metamorphosed during the Caledonian Orogeny. The rocks were deposited on the Laurentian margin during and following the break-up of Rodinia. This rift setting is evidenced, in the upper half of the succession, by the presence of several volcanic sequences. A significant development of these volcanic rocks occurs in the NE Grampian Highlands. There, the Blackwater Formation, within the Argyll Group of the Huntly area, is dominated by basic and ultrabasic metavolcanic rocks, with intercalated metasedimentary rocks. The rocks were metamorphosed in the amphibolite facies, with the Mg contents of their dominant amphiboles apparently reflecting those of the whole-rock protoliths. The protoliths ranged from ultrabasic picritic types (MgO up to 35 wt%) through high-magnesia basalts to basaltic andesites and andesites. The magmas feeding the volcanism were of tholeiitic affinity, broadly similar to metavolcanic rocks elsewhere in the Dalradian. Higher-Nb and lower-Nb groups can be distinguished. The inferred parental magmas were basalts with MgO c. 10 wt%. The ultrabasic rocks formed by accumulation of olivine and minor Cr-spinel within the parental basalts. Some more evolved rocks show evidence of minor (5–10 wt%) accumulation of Fe–Ti oxides. Primary magmas of the Blackwater metavolcanic rocks were generated from a mantle source, or sources, relatively enriched compared to the MORB source. It is speculated that all the Dalradian metavolcanic rocks represent varying degrees of mixing of magmas from this source and a depleted, MORB-like, mantle source.

AB - The Dalradian Supergroup of the Scottish Highlands is a largely metasedimentary succession of Neoproterozoic to Early Cambrian age, metamorphosed during the Caledonian Orogeny. The rocks were deposited on the Laurentian margin during and following the break-up of Rodinia. This rift setting is evidenced, in the upper half of the succession, by the presence of several volcanic sequences. A significant development of these volcanic rocks occurs in the NE Grampian Highlands. There, the Blackwater Formation, within the Argyll Group of the Huntly area, is dominated by basic and ultrabasic metavolcanic rocks, with intercalated metasedimentary rocks. The rocks were metamorphosed in the amphibolite facies, with the Mg contents of their dominant amphiboles apparently reflecting those of the whole-rock protoliths. The protoliths ranged from ultrabasic picritic types (MgO up to 35 wt%) through high-magnesia basalts to basaltic andesites and andesites. The magmas feeding the volcanism were of tholeiitic affinity, broadly similar to metavolcanic rocks elsewhere in the Dalradian. Higher-Nb and lower-Nb groups can be distinguished. The inferred parental magmas were basalts with MgO c. 10 wt%. The ultrabasic rocks formed by accumulation of olivine and minor Cr-spinel within the parental basalts. Some more evolved rocks show evidence of minor (5–10 wt%) accumulation of Fe–Ti oxides. Primary magmas of the Blackwater metavolcanic rocks were generated from a mantle source, or sources, relatively enriched compared to the MORB source. It is speculated that all the Dalradian metavolcanic rocks represent varying degrees of mixing of magmas from this source and a depleted, MORB-like, mantle source.

U2 - 10.1144/0036-9276/01-296

DO - 10.1144/0036-9276/01-296

M3 - Journal article

VL - 41

SP - 159

EP - 174

JO - Scottish Journal of Geology

JF - Scottish Journal of Geology

SN - 0036-9276

IS - 2

ER -