The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation
The relative role of petrogenetic variables at accreting plate margins varies according to the tectonic setting of the spreading centre in question. Spreading rate, heat flow, proximity to fracture zones and proximity to areas of 'anomalous' mantle are particularly important factors. This...
Published in: | Journal of the Geological Society |
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Geological Society of London
1977
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/8584/ https://doi.org/10.1144/gsjgs.134.2.0103 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:8584 2023-05-15T16:46:17+02:00 The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation Pearce, Julian A. Flower, M. F. J. 1977 https://orca.cardiff.ac.uk/id/eprint/8584/ https://doi.org/10.1144/gsjgs.134.2.0103 unknown Geological Society of London Pearce, Julian A. https://orca.cardiff.ac.uk/view/cardiffauthors/A072082J.html and Flower, M. F. J. 1977. The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation. Journal of the Geological Society 134 (2) , pp. 103-127. 10.1144/gsjgs.134.2.0103 https://doi.org/10.1144/gsjgs.134.2.0103 doi:10.1144/gsjgs.134.2.0103 QE Geology Article PeerReviewed 1977 ftunivcardiff https://doi.org/10.1144/gsjgs.134.2.0103 2022-09-25T20:16:43Z The relative role of petrogenetic variables at accreting plate margins varies according to the tectonic setting of the spreading centre in question. Spreading rate, heat flow, proximity to fracture zones and proximity to areas of 'anomalous' mantle are particularly important factors. This can be illustrated with reference to three well-studied areas: the FAMOUS segment of the Mid Atlantic Ridge; the Troodos ophiolite complexes and the active rift centres on Iceland. Geochemical modelling based on some critical major and trace element ratios reveals that crystal accumulation and fractional crystallization dominate variation both of the Troodos lavas (perhaps because a high degree of partial melting yielded a homogeneous primary magma) and of lavas from fast-spreading ridges (perhaps because of buffering in a large axial magma chamber). Source heterogeneities dominate variation of the Iceland lavas (perhaps because of 'anomalous' mantle beneath the centre of Iceland). The FAMOUS lavas exhibit a combination of primary magma and fractional crystallization variation. Article in Journal/Newspaper Iceland Cardiff University: ORCA (Online Research @ Cardiff) Mid-Atlantic Ridge Journal of the Geological Society 134 2 103 127 |
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Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Pearce, Julian A. Flower, M. F. J. The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation |
topic_facet |
QE Geology |
description |
The relative role of petrogenetic variables at accreting plate margins varies according to the tectonic setting of the spreading centre in question. Spreading rate, heat flow, proximity to fracture zones and proximity to areas of 'anomalous' mantle are particularly important factors. This can be illustrated with reference to three well-studied areas: the FAMOUS segment of the Mid Atlantic Ridge; the Troodos ophiolite complexes and the active rift centres on Iceland. Geochemical modelling based on some critical major and trace element ratios reveals that crystal accumulation and fractional crystallization dominate variation both of the Troodos lavas (perhaps because a high degree of partial melting yielded a homogeneous primary magma) and of lavas from fast-spreading ridges (perhaps because of buffering in a large axial magma chamber). Source heterogeneities dominate variation of the Iceland lavas (perhaps because of 'anomalous' mantle beneath the centre of Iceland). The FAMOUS lavas exhibit a combination of primary magma and fractional crystallization variation. |
format |
Article in Journal/Newspaper |
author |
Pearce, Julian A. Flower, M. F. J. |
author_facet |
Pearce, Julian A. Flower, M. F. J. |
author_sort |
Pearce, Julian A. |
title |
The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation |
title_short |
The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation |
title_full |
The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation |
title_fullStr |
The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation |
title_full_unstemmed |
The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation |
title_sort |
relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation |
publisher |
Geological Society of London |
publishDate |
1977 |
url |
https://orca.cardiff.ac.uk/id/eprint/8584/ https://doi.org/10.1144/gsjgs.134.2.0103 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Pearce, Julian A. https://orca.cardiff.ac.uk/view/cardiffauthors/A072082J.html and Flower, M. F. J. 1977. The relative importance of petrogenetic variables in magma genesis at accreting plate margins: a preliminary investigation. Journal of the Geological Society 134 (2) , pp. 103-127. 10.1144/gsjgs.134.2.0103 https://doi.org/10.1144/gsjgs.134.2.0103 doi:10.1144/gsjgs.134.2.0103 |
op_doi |
https://doi.org/10.1144/gsjgs.134.2.0103 |
container_title |
Journal of the Geological Society |
container_volume |
134 |
container_issue |
2 |
container_start_page |
103 |
op_container_end_page |
127 |
_version_ |
1766036394264756224 |