Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites
A series of 1-atm. melting experiments on basaltic flows collected from Holes 918D and 989B in the oceanic succession of the East Greenland continental margin can be used to define possible phase equilibria and liquid lines of descent. A sample from Site 918 (Section 152-918D-108R-2) shows the melti...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.804686 2024-09-15T18:04:21+00:00 Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites Thy, Peter Lesher, Charles E Mayfield, J D MEDIAN LATITUDE: 63.319967 * MEDIAN LONGITUDE: -39.307560 * SOUTH-BOUND LATITUDE: 63.092900 * WEST-BOUND LONGITUDE: -39.901900 * NORTH-BOUND LATITUDE: 63.522500 * EAST-BOUND LONGITUDE: -38.638900 * DATE/TIME START: 1993-10-10T02:00:00 * DATE/TIME END: 1995-09-20T13:30:00 1999 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.804686 https://doi.org/10.1594/PANGAEA.804686 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.804686 https://doi.org/10.1594/PANGAEA.804686 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Thy, Peter; Lesher, Charles E; Mayfield, J D (1999): Low-pressure melting studies of basalt and basaltic andesite from the Southeast Greenland continental margin and the origin of dacites at Site 917. In: Larsen, HC; Duncan, RA; Allan, JF; Brooks, K (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 163, 1-18, https://doi.org/10.2973/odp.proc.sr.163.114.1999 Ocean Drilling Program ODP dataset publication series 1999 ftpangaea https://doi.org/10.1594/PANGAEA.80468610.2973/odp.proc.sr.163.114.1999 2024-07-24T02:31:21Z A series of 1-atm. melting experiments on basaltic flows collected from Holes 918D and 989B in the oceanic succession of the East Greenland continental margin can be used to define possible phase equilibria and liquid lines of descent. A sample from Site 918 (Section 152-918D-108R-2) shows the melting order low-Ca pyroxene (1153ºC), augite (1182ºC), olivine (1192ºC), and plagioclase (1192ºC). A sample from Site 989 (Section 163-989B-10R-7) melts in the order of low-Ca pyroxene (1113ºC), augite (1167ºC), plagioclase (1177ºC), and olivine (1184ºC). In particular, the relatively early appearance of low-Ca pyroxene distinguishes the melting relations for the oceanic succession from those observed for the basaltic continental succession at Site 917. A basaltic andesite flow from the Middle Series at Site 917 (Section 152-917A-27R-4) shows the melting order of low-Ca pyroxene (1142ºC), plagioclase (1173ºC), and olivine (1173ºC). This melting order is difficult to reconcile with the observed large compositional variations in SiO2 and FeO for the Middle Series, which imply early magnetite fractionation. Major element considerations and rare-earth element modeling of the dacites of the Middle Series suggest that they formed by low extent of melting (<20%) of continental hydrated gabbroic or mafic amphibolite at pressures <8 kbar. These crustally derived melts represent possible contaminants of basaltic magmas of the Lower and Middle Series at Site 917. Other/Unknown Material East Greenland Greenland PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-39.901900,-38.638900,63.522500,63.092900) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Thy, Peter Lesher, Charles E Mayfield, J D Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites |
topic_facet |
Ocean Drilling Program ODP |
description |
A series of 1-atm. melting experiments on basaltic flows collected from Holes 918D and 989B in the oceanic succession of the East Greenland continental margin can be used to define possible phase equilibria and liquid lines of descent. A sample from Site 918 (Section 152-918D-108R-2) shows the melting order low-Ca pyroxene (1153ºC), augite (1182ºC), olivine (1192ºC), and plagioclase (1192ºC). A sample from Site 989 (Section 163-989B-10R-7) melts in the order of low-Ca pyroxene (1113ºC), augite (1167ºC), plagioclase (1177ºC), and olivine (1184ºC). In particular, the relatively early appearance of low-Ca pyroxene distinguishes the melting relations for the oceanic succession from those observed for the basaltic continental succession at Site 917. A basaltic andesite flow from the Middle Series at Site 917 (Section 152-917A-27R-4) shows the melting order of low-Ca pyroxene (1142ºC), plagioclase (1173ºC), and olivine (1173ºC). This melting order is difficult to reconcile with the observed large compositional variations in SiO2 and FeO for the Middle Series, which imply early magnetite fractionation. Major element considerations and rare-earth element modeling of the dacites of the Middle Series suggest that they formed by low extent of melting (<20%) of continental hydrated gabbroic or mafic amphibolite at pressures <8 kbar. These crustally derived melts represent possible contaminants of basaltic magmas of the Lower and Middle Series at Site 917. |
format |
Other/Unknown Material |
author |
Thy, Peter Lesher, Charles E Mayfield, J D |
author_facet |
Thy, Peter Lesher, Charles E Mayfield, J D |
author_sort |
Thy, Peter |
title |
Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites |
title_short |
Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites |
title_full |
Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites |
title_fullStr |
Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites |
title_full_unstemmed |
Geochemical composition during experimental melting of basaltic flows from ODP Leg 152 and Leg 163 sites |
title_sort |
geochemical composition during experimental melting of basaltic flows from odp leg 152 and leg 163 sites |
publisher |
PANGAEA |
publishDate |
1999 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.804686 https://doi.org/10.1594/PANGAEA.804686 |
op_coverage |
MEDIAN LATITUDE: 63.319967 * MEDIAN LONGITUDE: -39.307560 * SOUTH-BOUND LATITUDE: 63.092900 * WEST-BOUND LONGITUDE: -39.901900 * NORTH-BOUND LATITUDE: 63.522500 * EAST-BOUND LONGITUDE: -38.638900 * DATE/TIME START: 1993-10-10T02:00:00 * DATE/TIME END: 1995-09-20T13:30:00 |
long_lat |
ENVELOPE(-39.901900,-38.638900,63.522500,63.092900) |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
Supplement to: Thy, Peter; Lesher, Charles E; Mayfield, J D (1999): Low-pressure melting studies of basalt and basaltic andesite from the Southeast Greenland continental margin and the origin of dacites at Site 917. In: Larsen, HC; Duncan, RA; Allan, JF; Brooks, K (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 163, 1-18, https://doi.org/10.2973/odp.proc.sr.163.114.1999 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.804686 https://doi.org/10.1594/PANGAEA.804686 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.80468610.2973/odp.proc.sr.163.114.1999 |
_version_ |
1810441848001396736 |