Chemical analyses of ODP Hole 105-647A basalts (Table 2)
Basalt samples recovered from the lowermost 37 m of Leg 105 Hole 647A in the Labrador Sea are fine- to medium grained, have microphenocrysts of clinopyroxene, and show little evidence of alteration. Chemically, these rocks are low potassium (0.01-0.09 wt% K20), olivine- to quartz-normative tholeiite...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.745267 2024-09-15T17:57:06+00:00 Chemical analyses of ODP Hole 105-647A basalts (Table 2) Clarke, D B LATITUDE: 53.331300 * LONGITUDE: -45.262000 * DATE/TIME START: 1985-10-15T04:10:00 * DATE/TIME END: 1985-10-23T18:15:00 * MINIMUM ELEVATION: -3869.0 m * MAXIMUM ELEVATION: -3869.0 m 1989 text/tab-separated-values, 390 data points https://doi.pangaea.de/10.1594/PANGAEA.745267 https://doi.org/10.1594/PANGAEA.745267 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.745267 https://doi.org/10.1594/PANGAEA.745267 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Clarke, D B (1989): Petrology and geochemistry of basalts from ODP Leg 105, Hole 647A, Labrador Sea and the Davis Strait area. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 863-884, https://doi.org/10.2973/odp.proc.sr.105.175.1989 105-647A Albite Aluminium oxide Anorthite Apatite Barium Caesium Calcium oxide Cerium Chromium Copper Diopside DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Europium Gallium Hafnium Hypersthene Illite Iron oxide Fe2O3 FeO Joides Resolution Lanthanum Leg105 Lutetium Magnesium oxide Manganese oxide Montmorillonite Neodymium Nickel North Atlantic Ocean Ocean Drilling Program ODP Olivine Orthoclase Phosphorus pentoxide Potassium oxide Quartz Samarium Sample code/label Scandium Silicon dioxide Sodium oxide Strontium Strontium-87/Strontium-86 ratio Sum Tantalum dataset 1989 ftpangaea https://doi.org/10.1594/PANGAEA.74526710.2973/odp.proc.sr.105.175.1989 2024-08-21T00:02:26Z Basalt samples recovered from the lowermost 37 m of Leg 105 Hole 647A in the Labrador Sea are fine- to medium grained, have microphenocrysts of clinopyroxene, and show little evidence of alteration. Chemically, these rocks are low potassium (0.01-0.09 wt% K20), olivine- to quartz-normative tholeiites that are also depleted in other incompatible elements. In terms of many of the incompatible trace elements, the Labrador Sea samples are similar both to iV-type midocean ridge basalts (MORBs) and to the terrestrial Paleocene volcanic rocks in the Davis Strait region of Baffin Island and West Greenland. However, significant differences are found in their strontium and neodymium isotope systematics. Hole 647A samples are more depleted in epsilon-Nd (+9.3) and are anomalously rich in 87Sr/86Sr (0.7040) relative to the Davis Strait basalts (epsilon-Nd +2.54 to + 8.97; mean 87Sr/86Sr, 0.7034). We conclude that the Hole 647A and Davis Strait basalts may have been derived from a similar depleted mantle source composition. In addition, the Davis Strait magmas were generated from mantle of more than one composition. We also suggest that there is no geochemical evidence from the Hole 647A samples to support or to refute the existence of foundered continental crust in the Labrador Sea. Dataset Baffin Island Baffin Davis Strait Greenland Labrador Sea North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-45.262000,-45.262000,53.331300,53.331300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
105-647A Albite Aluminium oxide Anorthite Apatite Barium Caesium Calcium oxide Cerium Chromium Copper Diopside DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Europium Gallium Hafnium Hypersthene Illite Iron oxide Fe2O3 FeO Joides Resolution Lanthanum Leg105 Lutetium Magnesium oxide Manganese oxide Montmorillonite Neodymium Nickel North Atlantic Ocean Ocean Drilling Program ODP Olivine Orthoclase Phosphorus pentoxide Potassium oxide Quartz Samarium Sample code/label Scandium Silicon dioxide Sodium oxide Strontium Strontium-87/Strontium-86 ratio Sum Tantalum |
spellingShingle |
105-647A Albite Aluminium oxide Anorthite Apatite Barium Caesium Calcium oxide Cerium Chromium Copper Diopside DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Europium Gallium Hafnium Hypersthene Illite Iron oxide Fe2O3 FeO Joides Resolution Lanthanum Leg105 Lutetium Magnesium oxide Manganese oxide Montmorillonite Neodymium Nickel North Atlantic Ocean Ocean Drilling Program ODP Olivine Orthoclase Phosphorus pentoxide Potassium oxide Quartz Samarium Sample code/label Scandium Silicon dioxide Sodium oxide Strontium Strontium-87/Strontium-86 ratio Sum Tantalum Clarke, D B Chemical analyses of ODP Hole 105-647A basalts (Table 2) |
topic_facet |
105-647A Albite Aluminium oxide Anorthite Apatite Barium Caesium Calcium oxide Cerium Chromium Copper Diopside DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Europium Gallium Hafnium Hypersthene Illite Iron oxide Fe2O3 FeO Joides Resolution Lanthanum Leg105 Lutetium Magnesium oxide Manganese oxide Montmorillonite Neodymium Nickel North Atlantic Ocean Ocean Drilling Program ODP Olivine Orthoclase Phosphorus pentoxide Potassium oxide Quartz Samarium Sample code/label Scandium Silicon dioxide Sodium oxide Strontium Strontium-87/Strontium-86 ratio Sum Tantalum |
description |
Basalt samples recovered from the lowermost 37 m of Leg 105 Hole 647A in the Labrador Sea are fine- to medium grained, have microphenocrysts of clinopyroxene, and show little evidence of alteration. Chemically, these rocks are low potassium (0.01-0.09 wt% K20), olivine- to quartz-normative tholeiites that are also depleted in other incompatible elements. In terms of many of the incompatible trace elements, the Labrador Sea samples are similar both to iV-type midocean ridge basalts (MORBs) and to the terrestrial Paleocene volcanic rocks in the Davis Strait region of Baffin Island and West Greenland. However, significant differences are found in their strontium and neodymium isotope systematics. Hole 647A samples are more depleted in epsilon-Nd (+9.3) and are anomalously rich in 87Sr/86Sr (0.7040) relative to the Davis Strait basalts (epsilon-Nd +2.54 to + 8.97; mean 87Sr/86Sr, 0.7034). We conclude that the Hole 647A and Davis Strait basalts may have been derived from a similar depleted mantle source composition. In addition, the Davis Strait magmas were generated from mantle of more than one composition. We also suggest that there is no geochemical evidence from the Hole 647A samples to support or to refute the existence of foundered continental crust in the Labrador Sea. |
format |
Dataset |
author |
Clarke, D B |
author_facet |
Clarke, D B |
author_sort |
Clarke, D B |
title |
Chemical analyses of ODP Hole 105-647A basalts (Table 2) |
title_short |
Chemical analyses of ODP Hole 105-647A basalts (Table 2) |
title_full |
Chemical analyses of ODP Hole 105-647A basalts (Table 2) |
title_fullStr |
Chemical analyses of ODP Hole 105-647A basalts (Table 2) |
title_full_unstemmed |
Chemical analyses of ODP Hole 105-647A basalts (Table 2) |
title_sort |
chemical analyses of odp hole 105-647a basalts (table 2) |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.745267 https://doi.org/10.1594/PANGAEA.745267 |
op_coverage |
LATITUDE: 53.331300 * LONGITUDE: -45.262000 * DATE/TIME START: 1985-10-15T04:10:00 * DATE/TIME END: 1985-10-23T18:15:00 * MINIMUM ELEVATION: -3869.0 m * MAXIMUM ELEVATION: -3869.0 m |
long_lat |
ENVELOPE(-45.262000,-45.262000,53.331300,53.331300) |
genre |
Baffin Island Baffin Davis Strait Greenland Labrador Sea North Atlantic |
genre_facet |
Baffin Island Baffin Davis Strait Greenland Labrador Sea North Atlantic |
op_source |
Supplement to: Clarke, D B (1989): Petrology and geochemistry of basalts from ODP Leg 105, Hole 647A, Labrador Sea and the Davis Strait area. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 863-884, https://doi.org/10.2973/odp.proc.sr.105.175.1989 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.745267 https://doi.org/10.1594/PANGAEA.745267 |
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.74526710.2973/odp.proc.sr.105.175.1989 |
_version_ |
1810433281873674240 |