COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS.
Earlier work has shown that measurements of the anisotropy of magnetic susceptibility (AMS) of Deep-Sea Drilling Project (DSDP) igneous rocks can contribute to resolution of the mode of emplacement with 80% confidence. In order to clarify the reason for this 20% failure rate, the authors have made d...
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1976
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Online Access: | https://digitalcommons.lsu.edu/geo_pubs/876 https://doi.org/10.1029/JB081i023p04152 |
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1875 2023-06-11T04:13:09+02:00 COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS. Ellwood, B. B. Watkins, N. D. 1976-01-01T08:00:00Z https://digitalcommons.lsu.edu/geo_pubs/876 https://doi.org/10.1029/JB081i023p04152 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/876 doi:10.1029/JB081i023p04152 Faculty Publications text 1976 ftlouisianastuir https://doi.org/10.1029/JB081i023p04152 2023-05-28T18:17:12Z Earlier work has shown that measurements of the anisotropy of magnetic susceptibility (AMS) of Deep-Sea Drilling Project (DSDP) igneous rocks can contribute to resolution of the mode of emplacement with 80% confidence. In order to clarify the reason for this 20% failure rate, the authors have made detailed AMS analyses on traverses through pillow basalts collected during cruises of the R/V Trident. Although extrusive AMS characteristics dominate, occasional pillows posses intrusive AMS featurs towards the pillow center. This can be explained by magnetic crystal elongation (growth or realignment) occurring in response to a directed thermal stress in the cooling pillow, such as could occur during implosions. The authors have analyzed 182 DSDP igneous samples and found that the ratio of extrusive to intrusive samples in the entire collection is about 2 to 1. It is concluded that the DSDP basalts which have been sampled, particularly prior to leg 34, are to some extent not true basement but represent intrusives into layer 1 during later phases of igneous activity outside the midocean ridge. Text Iceland LSU Digital Commons (Louisiana State University) Trident ENVELOPE(169.233,169.233,-72.433,-72.433) Journal of Geophysical Research 81 23 4152 4156 |
institution |
Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
description |
Earlier work has shown that measurements of the anisotropy of magnetic susceptibility (AMS) of Deep-Sea Drilling Project (DSDP) igneous rocks can contribute to resolution of the mode of emplacement with 80% confidence. In order to clarify the reason for this 20% failure rate, the authors have made detailed AMS analyses on traverses through pillow basalts collected during cruises of the R/V Trident. Although extrusive AMS characteristics dominate, occasional pillows posses intrusive AMS featurs towards the pillow center. This can be explained by magnetic crystal elongation (growth or realignment) occurring in response to a directed thermal stress in the cooling pillow, such as could occur during implosions. The authors have analyzed 182 DSDP igneous samples and found that the ratio of extrusive to intrusive samples in the entire collection is about 2 to 1. It is concluded that the DSDP basalts which have been sampled, particularly prior to leg 34, are to some extent not true basement but represent intrusives into layer 1 during later phases of igneous activity outside the midocean ridge. |
format |
Text |
author |
Ellwood, B. B. Watkins, N. D. |
spellingShingle |
Ellwood, B. B. Watkins, N. D. COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS. |
author_facet |
Ellwood, B. B. Watkins, N. D. |
author_sort |
Ellwood, B. B. |
title |
COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS. |
title_short |
COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS. |
title_full |
COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS. |
title_fullStr |
COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS. |
title_full_unstemmed |
COMPARISON OF OBSERVED INTRUSIVE TO EXTRUSIVE RATIOS IN ICELAND AND THE TROODOS MASSIF WITH RESULTS OF EXPERIMENTAL EMPLACEMENT MODE ANALYSIS OF DSDP IGNEOUS ROCKS. |
title_sort |
comparison of observed intrusive to extrusive ratios in iceland and the troodos massif with results of experimental emplacement mode analysis of dsdp igneous rocks. |
publisher |
LSU Digital Commons |
publishDate |
1976 |
url |
https://digitalcommons.lsu.edu/geo_pubs/876 https://doi.org/10.1029/JB081i023p04152 |
long_lat |
ENVELOPE(169.233,169.233,-72.433,-72.433) |
geographic |
Trident |
geographic_facet |
Trident |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/876 doi:10.1029/JB081i023p04152 |
op_doi |
https://doi.org/10.1029/JB081i023p04152 |
container_title |
Journal of Geophysical Research |
container_volume |
81 |
container_issue |
23 |
container_start_page |
4152 |
op_container_end_page |
4156 |
_version_ |
1768389854463262720 |