10.1594/PANGAEA.743858
Johnson, Jeffrey A
Jeffrey A
Johnson
Composition of Lower Cretaceous sandstones of the Galicia margin
PANGAEA
1988
Drilling/drill rig
Leg103
Joides Resolution
Ocean Drilling Program (ODP)
1985-05-06T00:15:00/1985-06-15T13:30:00
en
Supplementary Publication Series of Datasets
10.2973/odp.proc.sr.103.127.1988
2 datasets
application/zip
Creative Commons Attribution 3.0 Unported
The composition of 31 samples of Lower Cretaceous (Valanginian to Aptian) sandstone from ODP Sites 638 through 641 was analyzed using the Gazzi-Dickinson point-counting method. The results show that the source of the Valanginian to Hauterivian sand was a continental block, dominated by granitic and/or high-grade-metamorphic rocks. Although these petrologic results do not allow discrimination between various potential continental block provinces, they suggest, in conjunction with seismic profiles and regional considerations, that the source was the Galicia margin or western Iberia. In contrast, the Barremian and Aptian sand is dominated by carbonate grains that were derived from a carbonate platform, probably on Galicia Bank.
Supplement to: Johnson, Jeffrey A (1988): Composition of Lower Cretaceous sandstone, Galicia margin. In: Boillot, G; Winterer, EL; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 103, 505-512
-12.4633
-12.1817
42.0167
42.155
South Atlantic Ocean