14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA
On Leg 19 of the Deep Sea Drilling Project, basaltic volcanic rocks were recovered from Site 183 in the western Gulf of Alaska, Site 191 on the floor of Kamchatka Basin, and Site 192 atop Meiji Guyot, the northernmost of the Emperor Seamounts. At Site 183, alkali-olivine basalt was recovered underly...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.487.6016 2023-05-15T15:43:56+02:00 14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA Richard J. Stewart Bering Sea The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6016 http://www.deepseadrilling.org/19/volume/dsdp19_14.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6016 http://www.deepseadrilling.org/19/volume/dsdp19_14.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.deepseadrilling.org/19/volume/dsdp19_14.pdf text ftciteseerx 2016-01-08T08:17:01Z On Leg 19 of the Deep Sea Drilling Project, basaltic volcanic rocks were recovered from Site 183 in the western Gulf of Alaska, Site 191 on the floor of Kamchatka Basin, and Site 192 atop Meiji Guyot, the northernmost of the Emperor Seamounts. At Site 183, alkali-olivine basalt was recovered underlying the thick sedimentary sequence of the Aleutian Abyssal Plain. The rocks strongly resemble Hawaiian alkali basalts, have high K, Sr, Zr, and Ba contents, and may be associated with the formation of nearby Derickson Seamount. They are inferred to postdate the basement age estimated from magnetic anomalies and to be extrusive onto oceanic crust. Tholeiitic basalt recovered at Site 191 beneath the sedimentary fill of Kamchatka Basin has low K2O, Ba, and Sr-87/Sr-86 values similar to midocean ridge tholeiites, but has higher Rb, Sr, and Zr values which follow patterns established for other inter-arc basin basalts. The basalt is probably part of a regionally developed basaltic basement which may have intruded and enveloped older basin deposits in middle Oligocene time. A series of at least five extrusive alkali basalt flows was recovered from near the crest of Meiji Guyot. The rocks are striking in having potassium feldspar cores in most Plagioclase phenocrysts, and in their coarse grain size, reaching sub-gabbroic textures in some flow interiors. Theoretical and experimental data indicate the almost pure potassium feldspar could not crystallize in equilibrium with associated labradorite. Origin as xenocrysts derived from late-stage plutonic differentiation and later inclusion in basaltic lavas is not possible as glassy rinds containing no potassium feldspar xenocrysts. The mineralogy probably results from secondary replacement of calcic Plagioclase cores by potassium-rich alkaline solutions produced during alteration of the basalts. Text Bering Sea Kamchatka Alaska Unknown Bering Sea Derickson Seamount ENVELOPE(-161.250,-161.250,52.833,52.833) Gulf of Alaska Meiji Guyot ENVELOPE(165.000,165.000,53.083,53.083) Pacific |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
On Leg 19 of the Deep Sea Drilling Project, basaltic volcanic rocks were recovered from Site 183 in the western Gulf of Alaska, Site 191 on the floor of Kamchatka Basin, and Site 192 atop Meiji Guyot, the northernmost of the Emperor Seamounts. At Site 183, alkali-olivine basalt was recovered underlying the thick sedimentary sequence of the Aleutian Abyssal Plain. The rocks strongly resemble Hawaiian alkali basalts, have high K, Sr, Zr, and Ba contents, and may be associated with the formation of nearby Derickson Seamount. They are inferred to postdate the basement age estimated from magnetic anomalies and to be extrusive onto oceanic crust. Tholeiitic basalt recovered at Site 191 beneath the sedimentary fill of Kamchatka Basin has low K2O, Ba, and Sr-87/Sr-86 values similar to midocean ridge tholeiites, but has higher Rb, Sr, and Zr values which follow patterns established for other inter-arc basin basalts. The basalt is probably part of a regionally developed basaltic basement which may have intruded and enveloped older basin deposits in middle Oligocene time. A series of at least five extrusive alkali basalt flows was recovered from near the crest of Meiji Guyot. The rocks are striking in having potassium feldspar cores in most Plagioclase phenocrysts, and in their coarse grain size, reaching sub-gabbroic textures in some flow interiors. Theoretical and experimental data indicate the almost pure potassium feldspar could not crystallize in equilibrium with associated labradorite. Origin as xenocrysts derived from late-stage plutonic differentiation and later inclusion in basaltic lavas is not possible as glassy rinds containing no potassium feldspar xenocrysts. The mineralogy probably results from secondary replacement of calcic Plagioclase cores by potassium-rich alkaline solutions produced during alteration of the basalts. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Richard J. Stewart Bering Sea |
spellingShingle |
Richard J. Stewart Bering Sea 14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA |
author_facet |
Richard J. Stewart Bering Sea |
author_sort |
Richard J. Stewart |
title |
14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA |
title_short |
14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA |
title_full |
14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA |
title_fullStr |
14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA |
title_full_unstemmed |
14. PETROLOGY OF VOLCANIC ROCKS RECOVERED ON DSDP LEG 19 FROM THE NORTH PACIFIC OCEAN AND THE BERING SEA |
title_sort |
14. petrology of volcanic rocks recovered on dsdp leg 19 from the north pacific ocean and the bering sea |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6016 http://www.deepseadrilling.org/19/volume/dsdp19_14.pdf |
long_lat |
ENVELOPE(-161.250,-161.250,52.833,52.833) ENVELOPE(165.000,165.000,53.083,53.083) |
geographic |
Bering Sea Derickson Seamount Gulf of Alaska Meiji Guyot Pacific |
geographic_facet |
Bering Sea Derickson Seamount Gulf of Alaska Meiji Guyot Pacific |
genre |
Bering Sea Kamchatka Alaska |
genre_facet |
Bering Sea Kamchatka Alaska |
op_source |
http://www.deepseadrilling.org/19/volume/dsdp19_14.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6016 http://www.deepseadrilling.org/19/volume/dsdp19_14.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766378153021800448 |