Chemistry of peridotites from ODP Hole 109-670A
Two types of serpentinized peridotites from Hole 670A of Leg 109 were studied in detail. A small piece of relatively unaltered sample, 109-670A-9R-1, #3 (22-24 cm), is olivine websterite characterized by aluminous chromian spinel with Cr/(Cr + Al) ratio of about 0.2. The other minerals have composit...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.745276 2024-09-15T18:23:33+00:00 Chemistry of peridotites from ODP Hole 109-670A Fujii, Toshitsugu LATITUDE: 23.166600 * LONGITUDE: -45.032200 * DATE/TIME START: 1986-06-12T01:30:00 * DATE/TIME END: 1986-06-16T16:15:00 1990 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.745276 https://doi.org/10.1594/PANGAEA.745276 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.745276 https://doi.org/10.1594/PANGAEA.745276 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Fujii, Toshitsugu (1990): Petrology of peridotites from Hole 670A, Leg 109. In: Detrick, R; Honnorez, J; Bryan, WB; Juteau, T; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 106/109, 19-25, https://doi.org/10.2973/odp.proc.sr.106109.116.1990 109-670A DRILL Drilling/drill rig Joides Resolution Leg109 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 1990 ftpangaea https://doi.org/10.1594/PANGAEA.74527610.2973/odp.proc.sr.106109.116.1990 2024-08-21T00:02:25Z Two types of serpentinized peridotites from Hole 670A of Leg 109 were studied in detail. A small piece of relatively unaltered sample, 109-670A-9R-1, #3 (22-24 cm), is olivine websterite characterized by aluminous chromian spinel with Cr/(Cr + Al) ratio of about 0.2. The other minerals have compositions essentially identical with those in more commonly observed serpentinized harzburgite like 109-670A-9R-01, #12 (94-97 cm). The occurrence of pyroxene-rich peridotite with normal harzburgite suggests that small scale heterogeneity in modal compositions exists in the upper mantle beneath the Mid-Atlantic Ridge. Low Cr/Al ratios of spinel and pyroxenes of those peridotites indicate that they are relatively less refractory among peridotites ever recovered from the oceanic region. Textures and the estimated equilibration temperatures indicate that peridotites recovered from Hole 670A are recrystallized and reequilibrated at subsolidus temperature. The occurrence of serpentinized peridotites from the rift valley of the active mid-oceanic ridge may suggest that they represent direct exposure of upwelling mantle materials rather than serpentine diapirs. Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-45.032200,-45.032200,23.166600,23.166600) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
109-670A DRILL Drilling/drill rig Joides Resolution Leg109 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
109-670A DRILL Drilling/drill rig Joides Resolution Leg109 North Atlantic Ocean Ocean Drilling Program ODP Fujii, Toshitsugu Chemistry of peridotites from ODP Hole 109-670A |
topic_facet |
109-670A DRILL Drilling/drill rig Joides Resolution Leg109 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Two types of serpentinized peridotites from Hole 670A of Leg 109 were studied in detail. A small piece of relatively unaltered sample, 109-670A-9R-1, #3 (22-24 cm), is olivine websterite characterized by aluminous chromian spinel with Cr/(Cr + Al) ratio of about 0.2. The other minerals have compositions essentially identical with those in more commonly observed serpentinized harzburgite like 109-670A-9R-01, #12 (94-97 cm). The occurrence of pyroxene-rich peridotite with normal harzburgite suggests that small scale heterogeneity in modal compositions exists in the upper mantle beneath the Mid-Atlantic Ridge. Low Cr/Al ratios of spinel and pyroxenes of those peridotites indicate that they are relatively less refractory among peridotites ever recovered from the oceanic region. Textures and the estimated equilibration temperatures indicate that peridotites recovered from Hole 670A are recrystallized and reequilibrated at subsolidus temperature. The occurrence of serpentinized peridotites from the rift valley of the active mid-oceanic ridge may suggest that they represent direct exposure of upwelling mantle materials rather than serpentine diapirs. |
format |
Other/Unknown Material |
author |
Fujii, Toshitsugu |
author_facet |
Fujii, Toshitsugu |
author_sort |
Fujii, Toshitsugu |
title |
Chemistry of peridotites from ODP Hole 109-670A |
title_short |
Chemistry of peridotites from ODP Hole 109-670A |
title_full |
Chemistry of peridotites from ODP Hole 109-670A |
title_fullStr |
Chemistry of peridotites from ODP Hole 109-670A |
title_full_unstemmed |
Chemistry of peridotites from ODP Hole 109-670A |
title_sort |
chemistry of peridotites from odp hole 109-670a |
publisher |
PANGAEA |
publishDate |
1990 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.745276 https://doi.org/10.1594/PANGAEA.745276 |
op_coverage |
LATITUDE: 23.166600 * LONGITUDE: -45.032200 * DATE/TIME START: 1986-06-12T01:30:00 * DATE/TIME END: 1986-06-16T16:15:00 |
long_lat |
ENVELOPE(-45.032200,-45.032200,23.166600,23.166600) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Fujii, Toshitsugu (1990): Petrology of peridotites from Hole 670A, Leg 109. In: Detrick, R; Honnorez, J; Bryan, WB; Juteau, T; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 106/109, 19-25, https://doi.org/10.2973/odp.proc.sr.106109.116.1990 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.745276 https://doi.org/10.1594/PANGAEA.745276 |
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.74527610.2973/odp.proc.sr.106109.116.1990 |
_version_ |
1810463775438929920 |