Unknown
PANGAEA
In:
Supplement to: Barker, S E; Kudo, A M; Keil, K (1983): Mineral chemistry of basalts from Holes 483 and 483B. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 635-642, https://doi.org/10.2973/dsdp.proc.65.130.1983
Publication Date:
2023-06-27
Description:
During DSDP Leg 65, a series of holes was drilled into the oceanic basement across the mouth of the Gulf of California to study the composition of the crust and the nature of its construction at a young spreading center. In Holes 483 and 483B, two of the deepest basement holes drilled on this leg, the basement is characterized by an upper sequence of interlayered massive basalts and sediments underlain by a lower sequence of interlayered pillow and massive basalts. Electron microprobe analyses were performed on pyroxene, plagioclase, olivine, spinel, and glass from 14 representative samples of 10 of the 16 major lithologic units. These analyses along with petrographic results can be used to interpret the detailed crystallization history of the basalts. We believe from the results of this study that the basalts were formed by at least a three-stage cooling process, followed by eruption and formation of quench phases. Our data do not support magma mixing.
Keywords:
65-483; 65-483B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg65; North Pacific/Gulf of California/CONT RISE
Type:
Dataset
Format:
application/zip, 4 datasets
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