Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica
Low grade metamorphic rocks exposed on the Ruppert Coast and Hobbs Coast are classified into two lithostratigraphic units. Herein the lower portion is named the Wilkins Nunatak Group and the upper portion is termed the Mount Pearson Group. The Wilkins Nunatak Group consists of a basal sequence of ca...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
Texas Tech University
1979
|
Subjects: | |
Online Access: | http://hdl.handle.net/2346/9123 |
id |
fttexastechuniv:oai:ttu-ir.tdl.org:2346/9123 |
---|---|
record_format |
openpolar |
spelling |
fttexastechuniv:oai:ttu-ir.tdl.org:2346/9123 2023-05-15T13:44:02+02:00 Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica Brand, John Frederick 1979-05 application/pdf http://hdl.handle.net/2346/9123 eng eng Texas Tech University http://hdl.handle.net/2346/9123 Unrestricted. Metamorphic Stratigraphic Rocks Geology Geology -- Antarctica -- Marie Byrd Land Thesis 1979 fttexastechuniv 2023-01-04T07:13:36Z Low grade metamorphic rocks exposed on the Ruppert Coast and Hobbs Coast are classified into two lithostratigraphic units. Herein the lower portion is named the Wilkins Nunatak Group and the upper portion is termed the Mount Pearson Group. The Wilkins Nunatak Group consists of a basal sequence of carbonate rocks conformably overlain by continental sediments. The Mount Pearson Group is composed of geosynclinal graywackes and subgraywackes. During the late Precambrian and early Paleozoic a shallow epicontinental sea covered the Ruppert and Hobbs coasts. Shelf carbonate beds which form the basal portion of the Wilkins Nijinatak Group were deposited upon an eroded complex of amphibolite gneiss. As the Ruppert Coast and areas farther west were uplifted, the sea retreated eastward and subgraywackes, protoquartzites and arkose conglomerates were deposited, with seeming conformity, upon the carbonate banks. Basinward, the continental sediments graded into thin-bedded sequences of sandstone and shale. By the Ordovician Period, the entire area was emergent and was subjected to widespread erosion which formed the regional unconformity at the top of the Wilkins funatak Group. Subsequently, areas west of the Ruppert Coast were uplifted and lithic graywackes, feldspathic graywackes and subgraywackes of the Mount Pearson Group accumulated in a rapidly subsiding basin. As subsidence continued, possibly to depths approaching 10 kilometers, the basal portion of the Wilkins Nunatak Group was metamorphosed. Granite plutons were emplaced during the Cretaceous Period. Block faulting occurred during early Tertiary time Thesis Antarc* Antarctica Hobbs coast Marie Byrd Land Ruppert coast Texas Tech University: TTU DSpace Repository Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Wilkins ENVELOPE(59.326,59.326,-67.248,-67.248) Hobbs ENVELOPE(-57.500,-57.500,-64.300,-64.300) Hobbs Coast ENVELOPE(-136.000,-136.000,-75.500,-75.500) Ruppert Coast ENVELOPE(-144.000,-144.000,-76.000,-76.000) Mount Pearson ENVELOPE(-140.950,-140.950,-75.900,-75.900) Wilkins Nunatak ENVELOPE(-139.917,-139.917,-75.650,-75.650) |
institution |
Open Polar |
collection |
Texas Tech University: TTU DSpace Repository |
op_collection_id |
fttexastechuniv |
language |
English |
topic |
Metamorphic Stratigraphic Rocks Geology Geology -- Antarctica -- Marie Byrd Land |
spellingShingle |
Metamorphic Stratigraphic Rocks Geology Geology -- Antarctica -- Marie Byrd Land Brand, John Frederick Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica |
topic_facet |
Metamorphic Stratigraphic Rocks Geology Geology -- Antarctica -- Marie Byrd Land |
description |
Low grade metamorphic rocks exposed on the Ruppert Coast and Hobbs Coast are classified into two lithostratigraphic units. Herein the lower portion is named the Wilkins Nunatak Group and the upper portion is termed the Mount Pearson Group. The Wilkins Nunatak Group consists of a basal sequence of carbonate rocks conformably overlain by continental sediments. The Mount Pearson Group is composed of geosynclinal graywackes and subgraywackes. During the late Precambrian and early Paleozoic a shallow epicontinental sea covered the Ruppert and Hobbs coasts. Shelf carbonate beds which form the basal portion of the Wilkins Nijinatak Group were deposited upon an eroded complex of amphibolite gneiss. As the Ruppert Coast and areas farther west were uplifted, the sea retreated eastward and subgraywackes, protoquartzites and arkose conglomerates were deposited, with seeming conformity, upon the carbonate banks. Basinward, the continental sediments graded into thin-bedded sequences of sandstone and shale. By the Ordovician Period, the entire area was emergent and was subjected to widespread erosion which formed the regional unconformity at the top of the Wilkins funatak Group. Subsequently, areas west of the Ruppert Coast were uplifted and lithic graywackes, feldspathic graywackes and subgraywackes of the Mount Pearson Group accumulated in a rapidly subsiding basin. As subsidence continued, possibly to depths approaching 10 kilometers, the basal portion of the Wilkins Nunatak Group was metamorphosed. Granite plutons were emplaced during the Cretaceous Period. Block faulting occurred during early Tertiary time |
format |
Thesis |
author |
Brand, John Frederick |
author_facet |
Brand, John Frederick |
author_sort |
Brand, John Frederick |
title |
Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica |
title_short |
Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica |
title_full |
Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica |
title_fullStr |
Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica |
title_full_unstemmed |
Low grade metamorphic rocks of the Ruppert and Hobbs coasts of Marie Byrd Land, Antarctica |
title_sort |
low grade metamorphic rocks of the ruppert and hobbs coasts of marie byrd land, antarctica |
publisher |
Texas Tech University |
publishDate |
1979 |
url |
http://hdl.handle.net/2346/9123 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(59.326,59.326,-67.248,-67.248) ENVELOPE(-57.500,-57.500,-64.300,-64.300) ENVELOPE(-136.000,-136.000,-75.500,-75.500) ENVELOPE(-144.000,-144.000,-76.000,-76.000) ENVELOPE(-140.950,-140.950,-75.900,-75.900) ENVELOPE(-139.917,-139.917,-75.650,-75.650) |
geographic |
Byrd Marie Byrd Land Wilkins Hobbs Hobbs Coast Ruppert Coast Mount Pearson Wilkins Nunatak |
geographic_facet |
Byrd Marie Byrd Land Wilkins Hobbs Hobbs Coast Ruppert Coast Mount Pearson Wilkins Nunatak |
genre |
Antarc* Antarctica Hobbs coast Marie Byrd Land Ruppert coast |
genre_facet |
Antarc* Antarctica Hobbs coast Marie Byrd Land Ruppert coast |
op_relation |
http://hdl.handle.net/2346/9123 |
op_rights |
Unrestricted. |
_version_ |
1766196265187540992 |