Author: Arthur Barnes Ford
Publisher:
ISBN:
Category : Gabbro
Languages : en
Pages : 44
Book Description
Description of newly named units in a differentiated stratiform mafic intrusion in northern Pensacola Mountains of Antarctica.
Stratigraphy of the Layered Gabbroic Dufek Intrusion, Antarctica
Author: Arthur Barnes Ford
Publisher:
ISBN:
Category : Gabbro
Languages : en
Pages : 44
Book Description
Description of newly named units in a differentiated stratiform mafic intrusion in northern Pensacola Mountains of Antarctica.
Publisher:
ISBN:
Category : Gabbro
Languages : en
Pages : 44
Book Description
Description of newly named units in a differentiated stratiform mafic intrusion in northern Pensacola Mountains of Antarctica.
Stratigraphy of the Layered Gabbroic Dufek Intrusion, Antarctica
Author: Arthur Barnes Ford
Publisher:
ISBN:
Category : Gabbro
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Gabbro
Languages : en
Pages : 36
Book Description
Stratigraphy of the Layered Gabbroic Dufek Intrusion, Antarctica
Author: Arthur Barnes Ford
Publisher:
ISBN:
Category : Gabbro
Languages : en
Pages : 36
Book Description
Description of newly named units in a differentiated stratiform mafic intrusion in northern Pensacola Mountains of Antarctica.
Publisher:
ISBN:
Category : Gabbro
Languages : en
Pages : 36
Book Description
Description of newly named units in a differentiated stratiform mafic intrusion in northern Pensacola Mountains of Antarctica.
Stratigraphy of the Layered Gabbronic Dufek Intrusion, Antarctica
Stratigraphy of the Layered Gabbroic Dufek Intrusion, Antarctica - Contributions to Stratigraphy
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
Book Description
Development of the layered series and capping granophyre of the Dufek intrusion of Antarctica
A Detailed Study of Mineral Compositions and Dihedral Angles Within the Hannah Peak Section of the Dufek Intrusion Pensacola Mountains, Antarctica
Author: Jacob D. Carnes
Publisher:
ISBN: 9781303657146
Category : Geology
Languages : en
Pages : 229
Book Description
The Jurassic Dufek Intrusion in Antarctica is arguably one of the largest layered intrusions in the world. However the mechanisms by which it grew are unclear. Previously published geochemical trends suggest that it grew by a few kilometer(s) thick injections of magma. However, laterally continuous, sharp based, modally graded pyroxenitic units may represent repeated small magma replenishments that successively constructed the Dufek Intrusion. This research addresses the questions of i) how the Dufek intrusion was constructed, ii) what controls the original texture of the crystals upon crystallization, and iii) whether or not the texture is partially or fully equilibrated during the cooling of the Dufek Intrusion. Abrupt shifts in mineral compositions across two pyroxene-rich horizons, plus the presence of xenocrysts and xenoliths indicate that the pyroxene-rich horizons are products of magma replenishments and that the intrusion grew by repeated small injections of magma. Dihedral angle variation and non-equilibrated grain boundaries suggest that impingement textures are preserved and only minor textural equilibration took place. It is found that modal abundance of plagioclase at least partially controls the dihedral angle population.
Publisher:
ISBN: 9781303657146
Category : Geology
Languages : en
Pages : 229
Book Description
The Jurassic Dufek Intrusion in Antarctica is arguably one of the largest layered intrusions in the world. However the mechanisms by which it grew are unclear. Previously published geochemical trends suggest that it grew by a few kilometer(s) thick injections of magma. However, laterally continuous, sharp based, modally graded pyroxenitic units may represent repeated small magma replenishments that successively constructed the Dufek Intrusion. This research addresses the questions of i) how the Dufek intrusion was constructed, ii) what controls the original texture of the crystals upon crystallization, and iii) whether or not the texture is partially or fully equilibrated during the cooling of the Dufek Intrusion. Abrupt shifts in mineral compositions across two pyroxene-rich horizons, plus the presence of xenocrysts and xenoliths indicate that the pyroxene-rich horizons are products of magma replenishments and that the intrusion grew by repeated small injections of magma. Dihedral angle variation and non-equilibrated grain boundaries suggest that impingement textures are preserved and only minor textural equilibration took place. It is found that modal abundance of plagioclase at least partially controls the dihedral angle population.
Geology and Seismic Stratigraphy of the Antarctic Margin
Author: Alan K. Cooper
Publisher: American Geophysical Union
ISBN: 9780875908847
Category : Science
Languages : en
Pages : 490
Book Description
Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 71. The Antarctic Ice Sheet has greatly affected global climate, sea level, ocean circulation, and southern hemisphere biota during Cenozoic times. Much of our understanding of the evolution of the ice sheet has been inferred from isotopic studies on distant deep-ocean sediments, because few Cenozoic rocks are exposed on the Antarctic continent. Yet, large differences occur between past ice volumes inferred from isotopic studies and those inferred from low-latitude sea-level variation. The massive quantities of glacially transported terrigenous sediments that lie beneath the Antarctic continental margin provide an additional, more direct record of the inferred ice sheet fluctuations. Volume 68 addresses the history of ice sheet fluctuations as recorded by geological and geophysical investigations of selected areas of the Antarctic continental margin. As described below, the volume gives data and results from on-going research by a major multinational project directed toward better understanding the impact of Antarctic Ice Sheet fluctuations on global sea levels and climates.
Publisher: American Geophysical Union
ISBN: 9780875908847
Category : Science
Languages : en
Pages : 490
Book Description
Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 71. The Antarctic Ice Sheet has greatly affected global climate, sea level, ocean circulation, and southern hemisphere biota during Cenozoic times. Much of our understanding of the evolution of the ice sheet has been inferred from isotopic studies on distant deep-ocean sediments, because few Cenozoic rocks are exposed on the Antarctic continent. Yet, large differences occur between past ice volumes inferred from isotopic studies and those inferred from low-latitude sea-level variation. The massive quantities of glacially transported terrigenous sediments that lie beneath the Antarctic continental margin provide an additional, more direct record of the inferred ice sheet fluctuations. Volume 68 addresses the history of ice sheet fluctuations as recorded by geological and geophysical investigations of selected areas of the Antarctic continental margin. As described below, the volume gives data and results from on-going research by a major multinational project directed toward better understanding the impact of Antarctic Ice Sheet fluctuations on global sea levels and climates.