Geochemistry and isotopic ratios of basalts from ODP Leg 163 sites ...

• Main Authors: Saunders, Andrew D, Kempton, Pamela D, Fitton, J Godfrey, Larsen, Lotte M
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1999
• Subjects: Ocean Drilling Program ODP; Greenland; Iceland; lotte
• Online Access: https://dx.doi.org/10.1594/pangaea.804661; https://doi.pangaea.de/10.1594/PANGAEA.804661

Voluminous, subaerial magmatism resulted in the formation of extensive seaward-dipping reflector sequences (SDRS) along the Paleogene Southeast Greenland rifted margin. Drilling during Leg 163 recovered basalts from the SDRS at 66ºN (Site 988) and 63ºN (Sites 989 and 990). The basalt from Site 988 is light rare-earth-element (REE) enriched (La(n)/Yb(n) = 3.4), with epsilon-Nd(t=60) = 5.3, 87Sr/86Sr = 0.7034, and 206Pb/204Pb = 17.98. It is similar to tholeiites recovered from the Irminger Basin during Leg 49 and to light-REE-enriched tholeiites from Iceland. Drilling at Site 989, the innermost of the sites on the 63ºN transect, was proposed to extend recovery of the earliest part of the SDRS initiated during Leg 152. These basalts are, however, younger than those from Site 917 and are compositionally similar to basalts from the more seaward Sites 990 and 915. Many of the basalts from Sites 989 and 990 show evidence of contamination by continental crust (e.g., epsilon-Nd(t=60) extends down to -3.7, 206Pb/204Pb ... : Supplement to: Saunders, Andrew D; Kempton, Pamela D; Fitton, J Godfrey; Larsen, Lotte M (1999): Sr, Nd, and Pb isotopes and trace element geochemistry of basalts from the Southeast Greenland margin. In: Larsen, HC; Duncan, RA; Allan, JF; Brooks, K (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 163, 1-17 ...