Richardson, Colin; Oakley, P J; Cann, Joe R (1984): Major and trace elements and interelement ratios at DSDP Leg 81 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.807094, Supplement to: Richardson, C et al. (1984): Trace and major element geochemistry of basalts from Leg 81. In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 795-806, https://doi.org/10.2973/dsdp.proc.81.132.1984
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Abstract:
Fifty-two samples of basalt from the four holes drilled on the Leg 81 transect across the Rockall margin were analyzed by X-ray fluorescence for Rb, Sr, Y, Zr, and Nb. On the basis of these results 13 samples were chosen for major and supplementary trace-element analysis. The results show no progressive change in the character of the volcanism, from Hole 555 in the continental domain through Holes 552 and 553A in the dipping reflector sequence to Hole 554A on the outer high. Two distinct magma types are present, apparently reflecting heterogeneity of the underlying mantle, but both types are present in both Holes 553A and 555, while Hole 552 and Hole 554 are each composed of a single type. Both magma types have a clear ocean-floor basalt signature when examined by discrimination diagrams, as does the basalt from Deep Sea Drilling Project Site 112, which formed at the same time as the Leg 81 basalts slightly farther south along the spreading center. In contrast, the basalts of East Greenland, formed at the same time, are more enriched in incompatible elements and have a within-plate geochemical signature, as is found in some basalts of Iceland today. Clearly the present distinction in geochemistry between the basalts of Iceland and those erupting well south on the Reykjanes Ridge was already established when continental splitting took place.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 56.340375 * Median Longitude: -22.209040 * South-bound Latitude: 56.042700 * West-bound Longitude: -23.528200 * North-bound Latitude: 56.561700 * East-bound Longitude: -20.782200
Date/Time Start: 1981-07-31T00:00:00 * Date/Time End: 1981-08-31T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Richardson, C; Oakley, PJ; Cann, JR (1984): (Table 3) Interelement ratios for 13 selected DSDP Leg 81 Holes basalts. https://doi.org/10.1594/PANGAEA.807092
- Richardson, C; Oakley, PJ; Cann, JR (1984): (Table 2) Major and trace elements of 13 selected samples at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807091
- Richardson, C; Oakley, PJ; Cann, JR (1984): (Table 1) Trace elements at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807090