Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada
Abstract--An approximately 0.4 km diameter elliptical structure formed in Devonian granite in southwestern Nova Scotia, herein named the Bloody Creek structure (BCS), is identified as a possible impact crater. Evidence for an impact origin is based on integrated geomorphic, geophysical, and petrogra...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1055.6839 2023-05-15T16:22:28+02:00 Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada Ian Spooner George Stevens Jared Morrow Peir Pufahl Richard Grieve Rob Raeside Jean Pilon Cliff Stanley Sandra Barr David Mcmullin The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1055.6839 http://www.acadiau.ca/%7Eispooner/pdfs_of_papers/Bloody%20Creek%20Crater.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1055.6839 http://www.acadiau.ca/%7Eispooner/pdfs_of_papers/Bloody%20Creek%20Crater.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.acadiau.ca/%7Eispooner/pdfs_of_papers/Bloody%20Creek%20Crater.pdf text 2009 ftciteseerx 2020-04-12T00:22:00Z Abstract--An approximately 0.4 km diameter elliptical structure formed in Devonian granite in southwestern Nova Scotia, herein named the Bloody Creek structure (BCS), is identified as a possible impact crater. Evidence for an impact origin is based on integrated geomorphic, geophysical, and petrographic data. A near-continuous geomorphic rim and a 10 m deep crater that is infilled with lacustrine sediments and peat define the BCS. Ground penetrating radar shows that the crater has a depressed inner floor that is sharply ringed by a 1 m high buried scarp. Heterogeneous material under the floor, interpreted as deposits from collapse of the transient cavity walls, is overlain by stratified and faulted lacustrine and wetland sediments. Alteration features found only in rim rocks include common grain comminution, polymict lithic microbreccias, kink-banded feldspar and biotite, single and multiple sets of closely spaced planar microstructures (PMs) in quartz and feldspar, and quartz mosaicism, rare reduced mineral birefringence, and chlorite showing plastic deformation and flow microtextures. Based on their form and crystallographic orientations, the quartz PMs consist of planar deformation features that document shock-metamorphic pressures ≤25 GPa. The age of the BCS is not determined. The low depth to diameter ratio of the crater, coupled with anomalously high shock-metamorphic pressures recorded at its exposed rim, may be a result of significant post-impact erosion. Alternatively, impact onto glacier ice during the waning stages of Wisconsinian deglaciation (about 12 ka BP) may have resulted in dissipation of much impact energy into the ice, resulting in the present morphology of the BCS. Text glacier* Unknown Canada |
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ftciteseerx |
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English |
description |
Abstract--An approximately 0.4 km diameter elliptical structure formed in Devonian granite in southwestern Nova Scotia, herein named the Bloody Creek structure (BCS), is identified as a possible impact crater. Evidence for an impact origin is based on integrated geomorphic, geophysical, and petrographic data. A near-continuous geomorphic rim and a 10 m deep crater that is infilled with lacustrine sediments and peat define the BCS. Ground penetrating radar shows that the crater has a depressed inner floor that is sharply ringed by a 1 m high buried scarp. Heterogeneous material under the floor, interpreted as deposits from collapse of the transient cavity walls, is overlain by stratified and faulted lacustrine and wetland sediments. Alteration features found only in rim rocks include common grain comminution, polymict lithic microbreccias, kink-banded feldspar and biotite, single and multiple sets of closely spaced planar microstructures (PMs) in quartz and feldspar, and quartz mosaicism, rare reduced mineral birefringence, and chlorite showing plastic deformation and flow microtextures. Based on their form and crystallographic orientations, the quartz PMs consist of planar deformation features that document shock-metamorphic pressures ≤25 GPa. The age of the BCS is not determined. The low depth to diameter ratio of the crater, coupled with anomalously high shock-metamorphic pressures recorded at its exposed rim, may be a result of significant post-impact erosion. Alternatively, impact onto glacier ice during the waning stages of Wisconsinian deglaciation (about 12 ka BP) may have resulted in dissipation of much impact energy into the ice, resulting in the present morphology of the BCS. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Ian Spooner George Stevens Jared Morrow Peir Pufahl Richard Grieve Rob Raeside Jean Pilon Cliff Stanley Sandra Barr David Mcmullin |
spellingShingle |
Ian Spooner George Stevens Jared Morrow Peir Pufahl Richard Grieve Rob Raeside Jean Pilon Cliff Stanley Sandra Barr David Mcmullin Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada |
author_facet |
Ian Spooner George Stevens Jared Morrow Peir Pufahl Richard Grieve Rob Raeside Jean Pilon Cliff Stanley Sandra Barr David Mcmullin |
author_sort |
Ian Spooner |
title |
Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada |
title_short |
Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada |
title_full |
Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada |
title_fullStr |
Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada |
title_full_unstemmed |
Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada |
title_sort |
identification of the bloody creek structure, a possible impact crater in southwestern nova scotia, canada |
publishDate |
2009 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1055.6839 http://www.acadiau.ca/%7Eispooner/pdfs_of_papers/Bloody%20Creek%20Crater.pdf |
geographic |
Canada |
geographic_facet |
Canada |
genre |
glacier* |
genre_facet |
glacier* |
op_source |
http://www.acadiau.ca/%7Eispooner/pdfs_of_papers/Bloody%20Creek%20Crater.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1055.6839 http://www.acadiau.ca/%7Eispooner/pdfs_of_papers/Bloody%20Creek%20Crater.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766010454156509184 |