Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire
The Conway granite of New Hampshire is a highly radioactive intrusive into which a 1-km-deep borehole was drilled and continuously cored in 1975. There are two major granitic units, the Osceola and the Conway. The Conway is cut by three lamprophyre dikes. Elastic moduli and petrographic studies were...
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Los Alamos Scientific Laboratory
1979
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ftunivnotexas:info:ark/67531/metadc1091075 2023-05-15T17:35:39+02:00 Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire Warren, N. 1979-11-01 52 pages Text https://doi.org/10.2172/5556844 https://digital.library.unt.edu/ark:/67531/metadc1091075/ English eng Los Alamos Scientific Laboratory rep-no: LA-8102-MS grantno: W-7405-ENG-36 doi:10.2172/5556844 osti: 5556844 https://digital.library.unt.edu/ark:/67531/metadc1091075/ ark: ark:/67531/metadc1091075 Granites Geothermal Legacy Petrography 15 Geothermal Energy Data Cracks Crystal Structure Rocks North Atlantic Region North America Size Physical Properties Microstructure Rock Mechanics New Hampshire Igneous Rocks Usa Geothermal Legacy 152003* -- Geothermal Data & Theory-- Rock-Water-Gas Interactions Information Cavities Boreholes Grain Size Drill Cores Report 1979 ftunivnotexas https://doi.org/10.2172/5556844 2021-02-27T23:08:11Z The Conway granite of New Hampshire is a highly radioactive intrusive into which a 1-km-deep borehole was drilled and continuously cored in 1975. There are two major granitic units, the Osceola and the Conway. The Conway is cut by three lamprophyre dikes. Elastic moduli and petrographic studies were on 14 samples from the core. These data and observations have been used to determine groupings in the rocks by characterizing microstructure. An important result is that carefully taken physical properties data (for example, velocities and strains) are sensitive indicators of microstructure. Based on velocity and strain data, three distinct groups are found: the lamprophyre dike rocks and two groups each of which contain samples from both the Osceola and Conway formations. These groups are also distinguished by petrographic observations of microcrack patterns. The groups are apparently controlled by grain size and by uniformity of the mixing of the mineral phases in the samples, and not by mineral modes or depth. This last result implies the coring of the Conway samples may have intensified the amount of cracking over that in the rocks in situ, but not the type of cracking. Coring does not apparently induce a distinct population of very thin (low aspect ratio) cracks; that is, such cracks are not needed to explain the low pressure stress and velocity data of these samples. Report North Atlantic University of North Texas: UNT Digital Library Conway ENVELOPE(-61.422,-61.422,-62.841,-62.841) |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Granites Geothermal Legacy Petrography 15 Geothermal Energy Data Cracks Crystal Structure Rocks North Atlantic Region North America Size Physical Properties Microstructure Rock Mechanics New Hampshire Igneous Rocks Usa Geothermal Legacy 152003* -- Geothermal Data & Theory-- Rock-Water-Gas Interactions Information Cavities Boreholes Grain Size Drill Cores |
spellingShingle |
Granites Geothermal Legacy Petrography 15 Geothermal Energy Data Cracks Crystal Structure Rocks North Atlantic Region North America Size Physical Properties Microstructure Rock Mechanics New Hampshire Igneous Rocks Usa Geothermal Legacy 152003* -- Geothermal Data & Theory-- Rock-Water-Gas Interactions Information Cavities Boreholes Grain Size Drill Cores Warren, N. Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire |
topic_facet |
Granites Geothermal Legacy Petrography 15 Geothermal Energy Data Cracks Crystal Structure Rocks North Atlantic Region North America Size Physical Properties Microstructure Rock Mechanics New Hampshire Igneous Rocks Usa Geothermal Legacy 152003* -- Geothermal Data & Theory-- Rock-Water-Gas Interactions Information Cavities Boreholes Grain Size Drill Cores |
description |
The Conway granite of New Hampshire is a highly radioactive intrusive into which a 1-km-deep borehole was drilled and continuously cored in 1975. There are two major granitic units, the Osceola and the Conway. The Conway is cut by three lamprophyre dikes. Elastic moduli and petrographic studies were on 14 samples from the core. These data and observations have been used to determine groupings in the rocks by characterizing microstructure. An important result is that carefully taken physical properties data (for example, velocities and strains) are sensitive indicators of microstructure. Based on velocity and strain data, three distinct groups are found: the lamprophyre dike rocks and two groups each of which contain samples from both the Osceola and Conway formations. These groups are also distinguished by petrographic observations of microcrack patterns. The groups are apparently controlled by grain size and by uniformity of the mixing of the mineral phases in the samples, and not by mineral modes or depth. This last result implies the coring of the Conway samples may have intensified the amount of cracking over that in the rocks in situ, but not the type of cracking. Coring does not apparently induce a distinct population of very thin (low aspect ratio) cracks; that is, such cracks are not needed to explain the low pressure stress and velocity data of these samples. |
format |
Report |
author |
Warren, N. |
author_facet |
Warren, N. |
author_sort |
Warren, N. |
title |
Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire |
title_short |
Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire |
title_full |
Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire |
title_fullStr |
Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire |
title_full_unstemmed |
Rock physics characterization of Conway granite from a DOE borehole, Conway, New Hampshire |
title_sort |
rock physics characterization of conway granite from a doe borehole, conway, new hampshire |
publisher |
Los Alamos Scientific Laboratory |
publishDate |
1979 |
url |
https://doi.org/10.2172/5556844 https://digital.library.unt.edu/ark:/67531/metadc1091075/ |
long_lat |
ENVELOPE(-61.422,-61.422,-62.841,-62.841) |
geographic |
Conway |
geographic_facet |
Conway |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
rep-no: LA-8102-MS grantno: W-7405-ENG-36 doi:10.2172/5556844 osti: 5556844 https://digital.library.unt.edu/ark:/67531/metadc1091075/ ark: ark:/67531/metadc1091075 |
op_doi |
https://doi.org/10.2172/5556844 |
_version_ |
1766134887670087680 |