Geochemistry of basalts from ODP Hole 113-690C
Basalts from Maud Rise, Weddell Sea, are vesicular and olivine-phyric. Major, trace, and rare earth element concentrations are similar to those of alkali basalts from ocean islands and seamounts. The rocks are low in MgO, Cr, Ni, and Sc, and high in TiO2, K2O, P2O5, Zr, and LREE contents. The abunda...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.753879 2023-05-15T18:21:13+02:00 Geochemistry of basalts from ODP Hole 113-690C Schandl, Eva S Gorton, Michael P Wicks, F J LATITUDE: -65.160000 * LONGITUDE: 1.204800 * DATE/TIME START: 1987-01-21T07:00:00 * DATE/TIME END: 1987-01-23T20:30:00 1990-11-19 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.753879 https://doi.org/10.1594/PANGAEA.753879 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.753879 https://doi.org/10.1594/PANGAEA.753879 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Schandl, Eva S; Gorton, Michael P; Wicks, F J (1990): Mineralogy and geochemistry of alkali basalts from Maud Rise, Weddell Sea, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 5-14, https://doi.org/10.2973/odp.proc.sr.113.184.1990 113-690C DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP South Atlantic Ocean Dataset 1990 ftpangaea https://doi.org/10.1594/PANGAEA.753879 https://doi.org/10.2973/odp.proc.sr.113.184.1990 2023-01-20T07:31:58Z Basalts from Maud Rise, Weddell Sea, are vesicular and olivine-phyric. Major, trace, and rare earth element concentrations are similar to those of alkali basalts from ocean islands and seamounts. The rocks are low in MgO, Cr, Ni, and Sc, and high in TiO2, K2O, P2O5, Zr, and LREE contents. The abundance of "primary" biotite and apatite in the matrix indicates the melting of a hydrous mantle. Prevalence of olivine and absence of plagioclase in the rocks suggests that the volatile in the melt was an H2O-CO2 mixture, where H2O was <0.5. Mantle derived xenocrysts in the basalt include corroded orthopyroxene, chromite, apatite, and olivine. Olivine (Fo90) is too magnesian to be in equilibrium with the basalts, as they contain only 5-6 wt% MgO. Based on the presence of mantle xenocrysts, the high concentration of incompatible elements, the spatial and chemical affinity with other ocean island basalts from the area, and the relative age of the basalt (overlain by late Campanian sediments), it is suggested that Maud Rise was probably generated by hot-spot activity, possible during a ridge crest jump prior to 84 Ma (anomaly 34 time). Iddingsite, a complex intergrowth of montmorillonite and goethite, is the major alteration product of second generation olivine. It is suggested that iddingsite crystallized at low temperatures (<200°C) from an oxidized fluid during deuteric alteration. Vesicles are commonly filled by zeolites which have been replaced by K-feldspars. Dataset South Atlantic Ocean Weddell Sea Ocean Island PANGAEA - Data Publisher for Earth & Environmental Science Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Weddell Weddell Sea ENVELOPE(1.204800,1.204800,-65.160000,-65.160000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-690C DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
113-690C DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP South Atlantic Ocean Schandl, Eva S Gorton, Michael P Wicks, F J Geochemistry of basalts from ODP Hole 113-690C |
topic_facet |
113-690C DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP South Atlantic Ocean |
description |
Basalts from Maud Rise, Weddell Sea, are vesicular and olivine-phyric. Major, trace, and rare earth element concentrations are similar to those of alkali basalts from ocean islands and seamounts. The rocks are low in MgO, Cr, Ni, and Sc, and high in TiO2, K2O, P2O5, Zr, and LREE contents. The abundance of "primary" biotite and apatite in the matrix indicates the melting of a hydrous mantle. Prevalence of olivine and absence of plagioclase in the rocks suggests that the volatile in the melt was an H2O-CO2 mixture, where H2O was <0.5. Mantle derived xenocrysts in the basalt include corroded orthopyroxene, chromite, apatite, and olivine. Olivine (Fo90) is too magnesian to be in equilibrium with the basalts, as they contain only 5-6 wt% MgO. Based on the presence of mantle xenocrysts, the high concentration of incompatible elements, the spatial and chemical affinity with other ocean island basalts from the area, and the relative age of the basalt (overlain by late Campanian sediments), it is suggested that Maud Rise was probably generated by hot-spot activity, possible during a ridge crest jump prior to 84 Ma (anomaly 34 time). Iddingsite, a complex intergrowth of montmorillonite and goethite, is the major alteration product of second generation olivine. It is suggested that iddingsite crystallized at low temperatures (<200°C) from an oxidized fluid during deuteric alteration. Vesicles are commonly filled by zeolites which have been replaced by K-feldspars. |
format |
Dataset |
author |
Schandl, Eva S Gorton, Michael P Wicks, F J |
author_facet |
Schandl, Eva S Gorton, Michael P Wicks, F J |
author_sort |
Schandl, Eva S |
title |
Geochemistry of basalts from ODP Hole 113-690C |
title_short |
Geochemistry of basalts from ODP Hole 113-690C |
title_full |
Geochemistry of basalts from ODP Hole 113-690C |
title_fullStr |
Geochemistry of basalts from ODP Hole 113-690C |
title_full_unstemmed |
Geochemistry of basalts from ODP Hole 113-690C |
title_sort |
geochemistry of basalts from odp hole 113-690c |
publisher |
PANGAEA |
publishDate |
1990 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.753879 https://doi.org/10.1594/PANGAEA.753879 |
op_coverage |
LATITUDE: -65.160000 * LONGITUDE: 1.204800 * DATE/TIME START: 1987-01-21T07:00:00 * DATE/TIME END: 1987-01-23T20:30:00 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(1.204800,1.204800,-65.160000,-65.160000) |
geographic |
Maud Rise Weddell Weddell Sea |
geographic_facet |
Maud Rise Weddell Weddell Sea |
genre |
South Atlantic Ocean Weddell Sea Ocean Island |
genre_facet |
South Atlantic Ocean Weddell Sea Ocean Island |
op_source |
Supplement to: Schandl, Eva S; Gorton, Michael P; Wicks, F J (1990): Mineralogy and geochemistry of alkali basalts from Maud Rise, Weddell Sea, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 5-14, https://doi.org/10.2973/odp.proc.sr.113.184.1990 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.753879 https://doi.org/10.1594/PANGAEA.753879 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.753879 https://doi.org/10.2973/odp.proc.sr.113.184.1990 |
_version_ |
1766200379708538880 |