(Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites
The principal objective of Leg 187 was to locate the Indian/Pacific mantle boundary by sampling and analyzing 8- to 28-Ma seafloor basalts to the north of the Australian Antarctic Discordance (AAD). In this paper we present Sr and Nd isotopic data from basaltic glasses recovered from the 13 sites dr...
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PANGAEA
2004
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.780718 https://doi.org/10.1594/PANGAEA.780718 |
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Open Polar |
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PANGAEA - Data Publisher for Earth & Environmental Science |
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ftpangaea |
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English |
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187-1152A 187-1152B 187-1153A 187-1154A 187-1155A 187-1155B 187-1156A 187-1156B 187-1157A 187-1157B 187-1159A 187-1160A 187-1160B 187-1161A 187-1162B 187-1163A 187-1164A 187-1164B DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Indian Ocean Joides Resolution Latitude of event Leg187 Longitude of event Neodymium Neodymium-143/Neodymium-144 ratio error Ocean Drilling Program ODP Samarium Samarium-147/Neodymium-144 ratio Sample code/label Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) ε-Neodymium |
spellingShingle |
187-1152A 187-1152B 187-1153A 187-1154A 187-1155A 187-1155B 187-1156A 187-1156B 187-1157A 187-1157B 187-1159A 187-1160A 187-1160B 187-1161A 187-1162B 187-1163A 187-1164A 187-1164B DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Indian Ocean Joides Resolution Latitude of event Leg187 Longitude of event Neodymium Neodymium-143/Neodymium-144 ratio error Ocean Drilling Program ODP Samarium Samarium-147/Neodymium-144 ratio Sample code/label Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) ε-Neodymium Pedersen, Rolf B Christie, David M Pyle, Douglas G (Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites |
topic_facet |
187-1152A 187-1152B 187-1153A 187-1154A 187-1155A 187-1155B 187-1156A 187-1156B 187-1157A 187-1157B 187-1159A 187-1160A 187-1160B 187-1161A 187-1162B 187-1163A 187-1164A 187-1164B DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Indian Ocean Joides Resolution Latitude of event Leg187 Longitude of event Neodymium Neodymium-143/Neodymium-144 ratio error Ocean Drilling Program ODP Samarium Samarium-147/Neodymium-144 ratio Sample code/label Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) ε-Neodymium |
description |
The principal objective of Leg 187 was to locate the Indian/Pacific mantle boundary by sampling and analyzing 8- to 28-Ma seafloor basalts to the north of the Australian Antarctic Discordance (AAD). In this paper we present Sr and Nd isotopic data from basaltic glasses recovered from the 13 sites drilled during Leg 187. Our data show that the boundary region is characterized by a gradual east-west increase in 87Sr/86Sr, with a corresponding decrease in 143Nd/144Nd across a 150-km-wide zone located east and west of the 127°E Fracture Zone. The Sr-Nd isotopic composition of glasses therefore confirms the general conclusions derived by the Leg 187 shipboard scientific party in that the mantle boundary follows a west-pointing, V-shaped depth anomaly that stretches across the ocean floor from the Australian to the Antarctic continental margins. We document that two systematic trends of covariation between 87Sr/86Sr and 143Nd/144Nd can be distinguished, suggesting that the basalts sampled during Leg 187 formed through the interaction of three contrasting source components: (1) a component that lies within the broad spectrum of Indian-type mantle compositions, (2) a boundary component, and (3) a Pacific-type mantle component. The variations in elemental and isotopic compositions indicate that the boundary component represents a distinct mantle region that is associated with the boundary between the Pacific and the Indian mid-ocean-ridge basalt (MORB) sources rather than a dispersed mantle heterogeneity that was preferentially extracted in the boundary region. However, the origin of the boundary component remains an open question. The three components are not randomly intermixed. The Indian and the Pacific mantle sources both interacted with the boundary component, but they seem not to have interacted directly with each other. Large local variability in isotopic compositions of lavas from the mantle boundary region demonstrates that magma extraction processes were unable to homogenize the isotopic contrasts present in ... |
format |
Dataset |
author |
Pedersen, Rolf B Christie, David M Pyle, Douglas G |
author_facet |
Pedersen, Rolf B Christie, David M Pyle, Douglas G |
author_sort |
Pedersen, Rolf B |
title |
(Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites |
title_short |
(Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites |
title_full |
(Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites |
title_fullStr |
(Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites |
title_full_unstemmed |
(Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites |
title_sort |
(table t1) nd and sr isotopic compositions, and nd and sm concentrations of glasses from odp leg 187 sites |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.780718 https://doi.org/10.1594/PANGAEA.780718 |
op_coverage |
MEDIAN LATITUDE: -43.181308 * MEDIAN LONGITUDE: 129.184359 * SOUTH-BOUND LATITUDE: -45.956700 * WEST-BOUND LONGITUDE: 126.908300 * NORTH-BOUND LATITUDE: -41.271510 * EAST-BOUND LONGITUDE: 134.998350 * DATE/TIME START: 1999-08-12T23:30:00 * DATE/TIME END: 2000-01-06T09:00:00 * MINIMUM ELEVATION: -5736.4 m * MAXIMUM ELEVATION: -4354.0 m |
long_lat |
ENVELOPE(126.908300,134.998350,-41.271510,-45.956700) |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Pedersen, Rolf B; Christie, David M; Pyle, Douglas G (2004): Regional and local mantle heterogeneities associated with the Australian Antarctic Discordance: Sr and Nd isotopic results from ODP Leg 187. In: Pedersen, RB; Christie, DM; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 187, 1-23, https://doi.org/10.2973/odp.proc.sr.187.205.2004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.780718 https://doi.org/10.1594/PANGAEA.780718 |
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.78071810.2973/odp.proc.sr.187.205.2004 |
_version_ |
1810490233409503232 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.780718 2024-09-15T17:43:18+00:00 (Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites Pedersen, Rolf B Christie, David M Pyle, Douglas G MEDIAN LATITUDE: -43.181308 * MEDIAN LONGITUDE: 129.184359 * SOUTH-BOUND LATITUDE: -45.956700 * WEST-BOUND LONGITUDE: 126.908300 * NORTH-BOUND LATITUDE: -41.271510 * EAST-BOUND LONGITUDE: 134.998350 * DATE/TIME START: 1999-08-12T23:30:00 * DATE/TIME END: 2000-01-06T09:00:00 * MINIMUM ELEVATION: -5736.4 m * MAXIMUM ELEVATION: -4354.0 m 2004 text/tab-separated-values, 455 data points https://doi.pangaea.de/10.1594/PANGAEA.780718 https://doi.org/10.1594/PANGAEA.780718 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.780718 https://doi.org/10.1594/PANGAEA.780718 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Pedersen, Rolf B; Christie, David M; Pyle, Douglas G (2004): Regional and local mantle heterogeneities associated with the Australian Antarctic Discordance: Sr and Nd isotopic results from ODP Leg 187. In: Pedersen, RB; Christie, DM; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 187, 1-23, https://doi.org/10.2973/odp.proc.sr.187.205.2004 187-1152A 187-1152B 187-1153A 187-1154A 187-1155A 187-1155B 187-1156A 187-1156B 187-1157A 187-1157B 187-1159A 187-1160A 187-1160B 187-1161A 187-1162B 187-1163A 187-1164A 187-1164B DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Indian Ocean Joides Resolution Latitude of event Leg187 Longitude of event Neodymium Neodymium-143/Neodymium-144 ratio error Ocean Drilling Program ODP Samarium Samarium-147/Neodymium-144 ratio Sample code/label Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) ε-Neodymium dataset 2004 ftpangaea https://doi.org/10.1594/PANGAEA.78071810.2973/odp.proc.sr.187.205.2004 2024-07-24T02:31:31Z The principal objective of Leg 187 was to locate the Indian/Pacific mantle boundary by sampling and analyzing 8- to 28-Ma seafloor basalts to the north of the Australian Antarctic Discordance (AAD). In this paper we present Sr and Nd isotopic data from basaltic glasses recovered from the 13 sites drilled during Leg 187. Our data show that the boundary region is characterized by a gradual east-west increase in 87Sr/86Sr, with a corresponding decrease in 143Nd/144Nd across a 150-km-wide zone located east and west of the 127°E Fracture Zone. The Sr-Nd isotopic composition of glasses therefore confirms the general conclusions derived by the Leg 187 shipboard scientific party in that the mantle boundary follows a west-pointing, V-shaped depth anomaly that stretches across the ocean floor from the Australian to the Antarctic continental margins. We document that two systematic trends of covariation between 87Sr/86Sr and 143Nd/144Nd can be distinguished, suggesting that the basalts sampled during Leg 187 formed through the interaction of three contrasting source components: (1) a component that lies within the broad spectrum of Indian-type mantle compositions, (2) a boundary component, and (3) a Pacific-type mantle component. The variations in elemental and isotopic compositions indicate that the boundary component represents a distinct mantle region that is associated with the boundary between the Pacific and the Indian mid-ocean-ridge basalt (MORB) sources rather than a dispersed mantle heterogeneity that was preferentially extracted in the boundary region. However, the origin of the boundary component remains an open question. The three components are not randomly intermixed. The Indian and the Pacific mantle sources both interacted with the boundary component, but they seem not to have interacted directly with each other. Large local variability in isotopic compositions of lavas from the mantle boundary region demonstrates that magma extraction processes were unable to homogenize the isotopic contrasts present in ... Dataset Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(126.908300,134.998350,-41.271510,-45.956700) |