Keszthelyi, Laszlo (2003): Classification of the mafic lava flows from ODP Leg 183

ODP 183


Keszthelyi, Laszlo
University of Arizona, Lunar and Planetary Laboratory, Flagstaff, AZ, United States

Classification of the mafic lava flows from ODP Leg 183
In: Frey, Frederick A., Coffin, Millard F., Wallace, Paul J., Antretter, Maria J., Arndt, Nicholas T., Barling, Jane, Boehem, Florian, Borre, Mai Kirstine, Coxall, Helen K., Damuth, John E., Delius, Heike, Duncan, Robert A., Inokuchi, Hiroo, Keszthelyi, Laszlo, Mahoney, John J., Moore, C. Leah, Mueller, R. Dietmar, Neal, Clive R., Nicolaysen, Kirsten E., Pringle, Malcolm S., Reusch, Douglas N., Saccocia, Peter J., Teagle, Damon A. H., Waehnert, Veronika, Weis, Dominique A. M., Wise, Sherwood W., Zhao, Xixi, Quilty, Patrick G. (editor), Proceedings of the Ocean Drilling Program; scientific results; Kerguelen Plateau-Broken Ridge; a large igneous province; covering Leg 183 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Fremantle, Australia; Sites 1135-1142; 7 December 1998-11 February 1999
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
Ocean Drilling Program Leg 183 (Kerguelen Plateau) produced some of the most systematic and detailed descriptions of lava flows ever compiled. A wide variety of lava types in various states of preservation were recovered. An initial attempt to make the identification of mafic lava flow types more systematic using only macroscopic observations made on the drill core is presented here. This technique successfully categorizes pahoehoe, aa, slab pahoehoe, and rubbly pahoehoe flows and provides an estimate of the certainty of each categorization. However, the technique needs to be improved in the future by increasing the list of diagnostic characteristics for slab and rubbly pahoehoe. Because of poor recovery and/or extreme alteration and weathering of the units, 12 of the 42 units (29%) could not be classified. Of the remaining 30 units, 7% were classified as slab pahoehoe, 13% as aa, 27% as pahoehoe, and 53% as rubbly pahoehoe. Pahoehoe and rubbly pahoehoe flows were found in Holes 1136A, 1137A, 1138A, and 1139A, whereas aa and slab pahoehoe flows were confined to the latter two holes.
Coverage:Geographic coordinates:
West:63.0000East: 98.0000

Igneous and metamorphic petrology; aa lava; classification; identification; igneous rocks; Indian Ocean; Kerguelen Plateau; lava; lava flows; Leg 183; mafic composition; Ocean Drilling Program; pahoehoe; slabs; Southern Ocean; volcanic rocks;