Saunders, Andrew D; Kempton, Pamela D; Fitton, J Godfrey; Larsen, Lotte M (1999): Geochemistry and isotopic ratios of basalts from ODP Leg 163 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.804661, Supplement to: Saunders, AD et al. (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, https://doi.org/10.2973/odp.proc.sr.163.122.1999
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Abstract:
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 extends down to 15.1). We suggest that the contaminant is a mixture of Archean granulite and amphibolite and that the most contaminated basalts have assimilated ~5% of crust. Uncontaminated basalts are isotopically similar to basalts from Site 918, on the main body of the SDRS, and are light-REE depleted. Consistent with previous models of the development of this margin, we show that at the time of formation of the basalts from Sites 989 and 990 (1) melting was at relatively shallow levels in a fully-fledged rift zone; (2) fragments of continental crust were present in the lithosphere above the zones of melt generation; and (3) the sublithospheric mantle was dominated by a depleted Icelandic plume component.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 64.527373 * Median Longitude: -37.521640 * South-bound Latitude: 63.472800 * West-bound Longitude: -39.901900 * North-bound Latitude: 65.704200 * East-bound Longitude: -34.871000
Date/Time Start: 1995-09-08T10:00:00 * Date/Time End: 1995-10-01T13:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Saunders, AD; Kempton, PD; Fitton, JG et al. (1999): (Table 1) Major and trace element composition of basalts from ODP Leg 163 sites. https://doi.org/10.1594/PANGAEA.804657
- Saunders, AD; Kempton, PD; Fitton, JG et al. (1999): (Table 2) Neodymium, samarium, strontium and lead isotopic ratios of basalts from ODP Leg 163 sites. https://doi.org/10.1594/PANGAEA.804659