GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA
The Cenozoic volcanic rocks of Ross Island and vicinity, Antarctica, are surface flows, tuffs, breccias, and small intrusives. The prominent rock is basanitoid. Alkali-basalt magma reached the surface over an appreciable length of time and was differentiated to produce a rock series: basanitoid → tr...
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ftunivnebraskali:oai:digitalcommons.unl.edu:geosciencefacpub-1336 2023-11-12T04:05:37+01:00 GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA Goldich, S. S. Treves, S. B. Suhr, N. H. Stuckless, J. S. 1975-07-01T07:00:00Z application/pdf https://digitalcommons.unl.edu/geosciencefacpub/332 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1336/viewcontent/Treves_JG_1975_Geochemistry_cenozoic.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/geosciencefacpub/332 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1336/viewcontent/Treves_JG_1975_Geochemistry_cenozoic.pdf Papers in the Earth and Atmospheric Sciences Earth Sciences text 1975 ftunivnebraskali 2023-10-30T10:56:18Z The Cenozoic volcanic rocks of Ross Island and vicinity, Antarctica, are surface flows, tuffs, breccias, and small intrusives. The prominent rock is basanitoid. Alkali-basalt magma reached the surface over an appreciable length of time and was differentiated to produce a rock series: basanitoid → trachybasalt → phonolite. The alkalic, silica-undersaturated rocks are part of a larger petrologic province composed of volcanic centers in a belt nearly 2,000 km long roughly parallel to the Transantarctic Mountains. Two trends of magmatic differentiation are apparent. At depth the fractional crystallization of olivine, clinopyroxene, and opaque oxide minerals, all of which are abundant as phenocrysts in the basanitoid flows, produced trachybasalt magma. At crustal levels, fractional crystallization of clinopyroxene, apatite, opaque oxides, kaersutite, plagioclase, and anorthoclase developed the phonolitic rocks. Alkali enrichment is marked, and the end-member phonolites contain 11% Na2O, 5.6% K2O, and 57% SiO2. The basanitoids contain relatively large amounts of Ba (~ 400 ppm), Sr (~ 1,000 ppm), and Rb (~ 30 ppm). The concentrations of these and other trace elements in the various rock types support the model of small degrees of partial melting of peridotitic mantle for the derivation of the basanitoid magma, and of magmatic differentiation for the subsequent development of the rock series. Text Antarc* Antarctica Ross Island University of Nebraska-Lincoln: DigitalCommons@UNL Ross Island Transantarctic Mountains |
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University of Nebraska-Lincoln: DigitalCommons@UNL |
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ftunivnebraskali |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Goldich, S. S. Treves, S. B. Suhr, N. H. Stuckless, J. S. GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA |
topic_facet |
Earth Sciences |
description |
The Cenozoic volcanic rocks of Ross Island and vicinity, Antarctica, are surface flows, tuffs, breccias, and small intrusives. The prominent rock is basanitoid. Alkali-basalt magma reached the surface over an appreciable length of time and was differentiated to produce a rock series: basanitoid → trachybasalt → phonolite. The alkalic, silica-undersaturated rocks are part of a larger petrologic province composed of volcanic centers in a belt nearly 2,000 km long roughly parallel to the Transantarctic Mountains. Two trends of magmatic differentiation are apparent. At depth the fractional crystallization of olivine, clinopyroxene, and opaque oxide minerals, all of which are abundant as phenocrysts in the basanitoid flows, produced trachybasalt magma. At crustal levels, fractional crystallization of clinopyroxene, apatite, opaque oxides, kaersutite, plagioclase, and anorthoclase developed the phonolitic rocks. Alkali enrichment is marked, and the end-member phonolites contain 11% Na2O, 5.6% K2O, and 57% SiO2. The basanitoids contain relatively large amounts of Ba (~ 400 ppm), Sr (~ 1,000 ppm), and Rb (~ 30 ppm). The concentrations of these and other trace elements in the various rock types support the model of small degrees of partial melting of peridotitic mantle for the derivation of the basanitoid magma, and of magmatic differentiation for the subsequent development of the rock series. |
format |
Text |
author |
Goldich, S. S. Treves, S. B. Suhr, N. H. Stuckless, J. S. |
author_facet |
Goldich, S. S. Treves, S. B. Suhr, N. H. Stuckless, J. S. |
author_sort |
Goldich, S. S. |
title |
GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA |
title_short |
GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA |
title_full |
GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA |
title_fullStr |
GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA |
title_full_unstemmed |
GEOCHEMISTRY OF THE CENOZOIC VOLCANIC ROCKS OF ROSS ISLAND AND VICINITY, ANTARCTICA |
title_sort |
geochemistry of the cenozoic volcanic rocks of ross island and vicinity, antarctica |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
1975 |
url |
https://digitalcommons.unl.edu/geosciencefacpub/332 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1336/viewcontent/Treves_JG_1975_Geochemistry_cenozoic.pdf |
geographic |
Ross Island Transantarctic Mountains |
geographic_facet |
Ross Island Transantarctic Mountains |
genre |
Antarc* Antarctica Ross Island |
genre_facet |
Antarc* Antarctica Ross Island |
op_source |
Papers in the Earth and Atmospheric Sciences |
op_relation |
https://digitalcommons.unl.edu/geosciencefacpub/332 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1336/viewcontent/Treves_JG_1975_Geochemistry_cenozoic.pdf |
_version_ |
1782342040019795968 |