dc.contributor.author |
Grantham, GH
|
en_US |
dc.contributor.author |
Thomas, RJ
|
en_US |
dc.contributor.author |
Eglington, BM
|
en_US |
dc.contributor.author |
Debruin, D
|
en_US |
dc.contributor.author |
Atanasov, A
|
en_US |
dc.contributor.author |
Evans, MJ
|
en_US |
dc.date.accessioned |
2007-03-28T08:59:35Z |
en_US |
dc.date.accessioned |
2007-06-07T10:08:28Z |
|
dc.date.available |
2007-03-28T08:59:35Z |
en_US |
dc.date.available |
2007-06-07T10:08:28Z |
|
dc.date.issued |
1993 |
en_US |
dc.identifier.citation |
Grantham, GH, et al. 1993. Corona textures in Proterozoic olivine melanorites of the equeefa suite, Natal metamorphic province, South-Africa. Mineralogy and Petrology, vol. 49, 02 January, pp 91-102 |
en_US |
dc.identifier.issn |
0930-0708 |
en_US |
dc.identifier.uri |
http://hdl.handle.net/10204/2162
|
en_US |
dc.identifier.uri |
http://hdl.handle.net/10204/2162
|
|
dc.description.abstract |
Olivine-plagioclase and phlogopite-plagioclase coronas have been identified from olivine melanorites of the mid- to late Proterozoic Equeefa Suite in southern Natal, South Africa. Olivine, in contact with plagioclase, is mantled by a shell of clear orthopyroxene, in turn rimmed by pale green (pargasitic) clinoamphibole. Locally a third rim, composed of a fine pargasite-spinel symplectite is developed adjacent to the plagioclase. The second corona reaction has produced greenish-brown pargasite at phlogopite-plagioclase interfaces. A third, less obvious reaction, between olivine and phlogopite is also noted. Analytical data of all the mineral phases present, along with the coronas, are given. Two-pyroxene thermometry yields magmatic core temperatures (approximately 1120-degrees-C), with rim compositions indicating equilibration at approximately 850-degrees-C. Consistent with this, the modelled olivine-plagioclase reaction occurs between 830-1050-degrees-C with a(water) between 0.1 and 1.0 at 7 kbar. The three reactions took place during a prolonged history of cooling and partial hydration of the magmatic olivine melanorites from over 1000-degrees-C down to approximately 600-degrees-C. The P-T conditions indicated by the reactions suggest this cooling process was essentially isobaric, indicating that the area was not subjected to rapid uplift or burial throughout this entire period. |
en_US |
dc.format.extent |
1326904 bytes |
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dc.format.mimetype |
application/pdf |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Springer-Verlag Wien |
en_US |
dc.rights |
Copyright: 1993 Springer-Verlag Wien |
en_US |
dc.subject |
Olivine-Plagioclase |
en_US |
dc.subject |
Phlogopite plagioclase |
en_US |
dc.subject |
Olivine melaronorites |
en_US |
dc.subject |
Proterozoic equeefa suite |
en_US |
dc.subject |
Natal |
en_US |
dc.subject |
South Africa |
en_US |
dc.subject |
Mineralogy |
en_US |
dc.title |
Corona textures in Proterozoic olivine melanorites of the equeefa suite, Natal metamorphic province, South-Africa |
en_US |
dc.type |
Article |
en_US |
dc.identifier.apacitation |
Grantham, G., Thomas, R., Eglington, B., Debruin, D., Atanasov, A., & Evans, M. (1993). Corona textures in Proterozoic olivine melanorites of the equeefa suite, Natal metamorphic province, South-Africa. http://hdl.handle.net/10204/2162 |
en_ZA |
dc.identifier.chicagocitation |
Grantham, GH, RJ Thomas, BM Eglington, D Debruin, A Atanasov, and MJ Evans "Corona textures in Proterozoic olivine melanorites of the equeefa suite, Natal metamorphic province, South-Africa." (1993) http://hdl.handle.net/10204/2162 |
en_ZA |
dc.identifier.vancouvercitation |
Grantham G, Thomas R, Eglington B, Debruin D, Atanasov A, Evans M. Corona textures in Proterozoic olivine melanorites of the equeefa suite, Natal metamorphic province, South-Africa. 1993; http://hdl.handle.net/10204/2162. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Grantham, GH
AU - Thomas, RJ
AU - Eglington, BM
AU - Debruin, D
AU - Atanasov, A
AU - Evans, MJ
AB - Olivine-plagioclase and phlogopite-plagioclase coronas have been identified from olivine melanorites of the mid- to late Proterozoic Equeefa Suite in southern Natal, South Africa. Olivine, in contact with plagioclase, is mantled by a shell of clear orthopyroxene, in turn rimmed by pale green (pargasitic) clinoamphibole. Locally a third rim, composed of a fine pargasite-spinel symplectite is developed adjacent to the plagioclase. The second corona reaction has produced greenish-brown pargasite at phlogopite-plagioclase interfaces. A third, less obvious reaction, between olivine and phlogopite is also noted. Analytical data of all the mineral phases present, along with the coronas, are given. Two-pyroxene thermometry yields magmatic core temperatures (approximately 1120-degrees-C), with rim compositions indicating equilibration at approximately 850-degrees-C. Consistent with this, the modelled olivine-plagioclase reaction occurs between 830-1050-degrees-C with a(water) between 0.1 and 1.0 at 7 kbar. The three reactions took place during a prolonged history of cooling and partial hydration of the magmatic olivine melanorites from over 1000-degrees-C down to approximately 600-degrees-C. The P-T conditions indicated by the reactions suggest this cooling process was essentially isobaric, indicating that the area was not subjected to rapid uplift or burial throughout this entire period.
DA - 1993
DB - ResearchSpace
DP - CSIR
KW - Olivine-Plagioclase
KW - Phlogopite plagioclase
KW - Olivine melaronorites
KW - Proterozoic equeefa suite
KW - Natal
KW - South Africa
KW - Mineralogy
LK - https://researchspace.csir.co.za
PY - 1993
SM - 0930-0708
T1 - Corona textures in Proterozoic olivine melanorites of the equeefa suite, Natal metamorphic province, South-Africa
TI - Corona textures in Proterozoic olivine melanorites of the equeefa suite, Natal metamorphic province, South-Africa
UR - http://hdl.handle.net/10204/2162
ER -
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en_ZA |