(Table T1) Nd and Sr isotopic compositions, and Nd and Sm concentrations of glasses from ODP Leg 187 sites ...

• Main Authors: Pedersen, Rolf B, Christie, David M, Pyle, Douglas G
• Format: Dataset
• Language: English
• Published: PANGAEA 2004
• Subjects: Event label; Longitude of event; Latitude of event; Elevation of event; Sample code/label; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Samarium-147/Neodymium-144 ratio; Samarium; Neodymium; ε-Neodymium; Drilling/drill rig; DSDP/ODP/IODP sample designation; Thermal Ionization Mass Spectrometry TIMS; Leg187; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.780718; https://doi.pangaea.de/10.1594/PANGAEA.780718

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 ... : 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 ...