Chemical composition of Ninetyeast Ridge basalts
On Leg 121 of the Ocean Drilling Program, we recovered basaltic rocks from a total of three basement sites in the southern, central, and northern regions of Ninetyeast Ridge. These new sites complement the previous four basement holes drilled during Legs 22 and 26 of the Deep Sea Drilling Project, a...
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1991
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.760655 2023-05-15T16:53:06+02:00 Chemical composition of Ninetyeast Ridge basalts Saunders, Andrew D Storey, Michael Gibson, Ian L Leat, Philip Hergt, Janet M Thompson, Robert N MEDIAN LATITUDE: -12.655617 * MEDIAN LONGITUDE: 88.704141 * SOUTH-BOUND LATITUDE: -27.355000 * WEST-BOUND LONGITUDE: 87.366200 * NORTH-BOUND LATITUDE: 5.384200 * EAST-BOUND LONGITUDE: 90.361200 * DATE/TIME START: 1972-02-08T00:00:00 * DATE/TIME END: 1988-06-24T13:30:00 1991-05-13 application/zip, 9 datasets https://doi.pangaea.de/10.1594/PANGAEA.760655 https://doi.org/10.1594/PANGAEA.760655 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.760655 https://doi.org/10.1594/PANGAEA.760655 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Saunders, Andrew D; Storey, Michael; Gibson, Ian L; Leat, Philip; Hergt, Janet M; Thompson, Robert N (1991): Chemical and isotopic constraints of the origin of basalts from Ninetyeast Ridge, Indian Ocean: Results from DSDP Leg 22 and 26 and ODP Leg 121. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 559-590, https://doi.org/10.2973/odp.proc.sr.121.169.1991 121-756C 121-756D 121-757B 121-757C 121-758A 22-214 22-216 26-253 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean Indian Ocean//RIDGE Joides Resolution Leg121 Leg22 Leg26 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Dataset 1991 ftpangaea https://doi.org/10.1594/PANGAEA.760655 https://doi.org/10.2973/odp.proc.sr.121.169.1991 2023-01-20T07:32:10Z On Leg 121 of the Ocean Drilling Program, we recovered basaltic rocks from a total of three basement sites in the southern, central, and northern regions of Ninetyeast Ridge. These new sites complement the previous four basement holes drilled during Legs 22 and 26 of the Deep Sea Drilling Project, and confirm the predominantly tholeiitic, light rare earth element-enriched character of the basalts that cap the ridge. The basalts show marked iron enrichment; ferrobasalts occur at Sites 214 and 216 and oceanic andesites at Site 253. All of the basalts recovered during Leg 121 are altered, and range from aphyric olivine tholeiites (Site 756), to strongly plagioclase-phyric basalts (Site 757). Basalts from Site 758, which were clearly erupted in a submarine environment (pillow basalts are present in the section), are sparsely to strongly plagioclase-phyric. The basalts recovered at any one hole are isotopically homogeneous (except for the basalts from Site 758, which show a range of Pb isotopes), and it is possible to relate the magmas at any one site by high-level fractionation processes. However, there are significant variations in isotope ratios and highly incompatible element ratios between sites, which suggest that the mantle source for the ridge basalts was compositionally variable. Such variation, in view of the large volume of magmatic products that form the ridge system, is not surprising. There is not, however, a systematic variation in basalt composition along the ridge. We agree with previous models that relate Ninetyeast Ridge to a mantle plume in the southern Indian Ocean. The tholeiitic, iron-enriched, and voluminous character of the ridge basalts is typical of oceanic islands associated with plumes on or near a mid-ocean ridge (e.g., Iceland, Galapagos Islands, and St. Paul/Amsterdam islands). The absence of recovered alkalic suites is inconsistent with an intraplate setting, such as the Hawaiian Islands or Kerguelen Island. Thus, the major element data, like the gravity data, strongly suggest that ... Dataset Iceland PANGAEA - Data Publisher for Earth & Environmental Science Galapagos Indian Kerguelen Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) ENVELOPE(87.366200,90.361200,5.384200,-27.355000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
121-756C 121-756D 121-757B 121-757C 121-758A 22-214 22-216 26-253 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean Indian Ocean//RIDGE Joides Resolution Leg121 Leg22 Leg26 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
121-756C 121-756D 121-757B 121-757C 121-758A 22-214 22-216 26-253 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean Indian Ocean//RIDGE Joides Resolution Leg121 Leg22 Leg26 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Saunders, Andrew D Storey, Michael Gibson, Ian L Leat, Philip Hergt, Janet M Thompson, Robert N Chemical composition of Ninetyeast Ridge basalts |
topic_facet |
121-756C 121-756D 121-757B 121-757C 121-758A 22-214 22-216 26-253 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Indian Ocean Indian Ocean//RIDGE Joides Resolution Leg121 Leg22 Leg26 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
On Leg 121 of the Ocean Drilling Program, we recovered basaltic rocks from a total of three basement sites in the southern, central, and northern regions of Ninetyeast Ridge. These new sites complement the previous four basement holes drilled during Legs 22 and 26 of the Deep Sea Drilling Project, and confirm the predominantly tholeiitic, light rare earth element-enriched character of the basalts that cap the ridge. The basalts show marked iron enrichment; ferrobasalts occur at Sites 214 and 216 and oceanic andesites at Site 253. All of the basalts recovered during Leg 121 are altered, and range from aphyric olivine tholeiites (Site 756), to strongly plagioclase-phyric basalts (Site 757). Basalts from Site 758, which were clearly erupted in a submarine environment (pillow basalts are present in the section), are sparsely to strongly plagioclase-phyric. The basalts recovered at any one hole are isotopically homogeneous (except for the basalts from Site 758, which show a range of Pb isotopes), and it is possible to relate the magmas at any one site by high-level fractionation processes. However, there are significant variations in isotope ratios and highly incompatible element ratios between sites, which suggest that the mantle source for the ridge basalts was compositionally variable. Such variation, in view of the large volume of magmatic products that form the ridge system, is not surprising. There is not, however, a systematic variation in basalt composition along the ridge. We agree with previous models that relate Ninetyeast Ridge to a mantle plume in the southern Indian Ocean. The tholeiitic, iron-enriched, and voluminous character of the ridge basalts is typical of oceanic islands associated with plumes on or near a mid-ocean ridge (e.g., Iceland, Galapagos Islands, and St. Paul/Amsterdam islands). The absence of recovered alkalic suites is inconsistent with an intraplate setting, such as the Hawaiian Islands or Kerguelen Island. Thus, the major element data, like the gravity data, strongly suggest that ... |
format |
Dataset |
author |
Saunders, Andrew D Storey, Michael Gibson, Ian L Leat, Philip Hergt, Janet M Thompson, Robert N |
author_facet |
Saunders, Andrew D Storey, Michael Gibson, Ian L Leat, Philip Hergt, Janet M Thompson, Robert N |
author_sort |
Saunders, Andrew D |
title |
Chemical composition of Ninetyeast Ridge basalts |
title_short |
Chemical composition of Ninetyeast Ridge basalts |
title_full |
Chemical composition of Ninetyeast Ridge basalts |
title_fullStr |
Chemical composition of Ninetyeast Ridge basalts |
title_full_unstemmed |
Chemical composition of Ninetyeast Ridge basalts |
title_sort |
chemical composition of ninetyeast ridge basalts |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.760655 https://doi.org/10.1594/PANGAEA.760655 |
op_coverage |
MEDIAN LATITUDE: -12.655617 * MEDIAN LONGITUDE: 88.704141 * SOUTH-BOUND LATITUDE: -27.355000 * WEST-BOUND LONGITUDE: 87.366200 * NORTH-BOUND LATITUDE: 5.384200 * EAST-BOUND LONGITUDE: 90.361200 * DATE/TIME START: 1972-02-08T00:00:00 * DATE/TIME END: 1988-06-24T13:30:00 |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) ENVELOPE(87.366200,90.361200,5.384200,-27.355000) |
geographic |
Galapagos Indian Kerguelen Kerguelen Island |
geographic_facet |
Galapagos Indian Kerguelen Kerguelen Island |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Supplement to: Saunders, Andrew D; Storey, Michael; Gibson, Ian L; Leat, Philip; Hergt, Janet M; Thompson, Robert N (1991): Chemical and isotopic constraints of the origin of basalts from Ninetyeast Ridge, Indian Ocean: Results from DSDP Leg 22 and 26 and ODP Leg 121. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 559-590, https://doi.org/10.2973/odp.proc.sr.121.169.1991 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.760655 https://doi.org/10.1594/PANGAEA.760655 |
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.760655 https://doi.org/10.2973/odp.proc.sr.121.169.1991 |
_version_ |
1766043611676278784 |