Citation:

odp.proc.sr.106109.124.1990

Name: Geochemistry of basalts from Serocki Volcano
Published: 1990
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Basalts collected during drilling and diving programs on Serocki Volcano mostly fall within a limited compositional range, and are moderately evolved, normal MORBs with distinctive high MgO contents (averaging 7.60 wt%) and high A1203 concentrations (averaging 16.14 wt% in whole rock samples). However, samples recovered from within the central crater have lower Ti02 and FeO*/MgO, and higher MgO and Al2O3 concentrations, and are most similar to glasses recovered at Site 649 about 45 km to the north. Comparison of the observed geochemical variations with low-pressure experimental work and other samples from the region suggests that the Serocki Volcano and Site 649 data are compatible with crystal-liquid fractionation involving both olivine and early-stage clinopyroxene, as well as plagioclase, and that the sources may be similar even though Sites 648 and 649 are located in different, but adjacent, spreading cells.

Consideration of the stratigraphy and morphology of Serocki Volcano suggests that this feature is more properly described as a megatumulus or lava delta, associated with a steeper, conical peak to the southwest. The evolution of Serocki Volcano involved early construction of a marginal rampart of pillows, followed by doming of this feature and the formation of a perched lava pond. Draining of this pond resulted in collapse and the formation of the central crater.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 23.024279 * Median Longitude: -44.971534 * South-bound Latitude: 22.916700 * West-bound Longitude: -45.045800 * North-bound Latitude: 23.517000 * East-bound Longitude: -44.947100

Date/Time Start: 1986-04-29T00:00:00 * Date/Time End: 1986-06-16T16:15:00

Event(s):

109-648A * Latitude: 22.921830 * Longitude: -44.947170 * Date/Time: 1986-04-29T00:00:00 * Elevation: -3289.0 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL)

109-648B * Latitude: 22.922000 * Longitude: -44.947100 * Date/Time Start: 1986-04-29T04:00:00 * Date/Time End: 1986-05-31T04:30:00 * Elevation: -3341.0 m * Penetration: 50.5 m * Recovery: 17.6 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 105.5 m cored; 0 m drilled; 16.7 % recovery

109-669A * Latitude: 23.517000 * Longitude: -45.045800 * Date/Time Start: 1986-05-31T20:35:00 * Date/Time End: 1986-06-02T02:00:00 * Elevation: -1979.0 m * Penetration: 4 m * Recovery: 0.1 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 4 m cored; 0 m drilled; 2.5 % recovery

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

4 datasets

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Datasets listed in this publication series

Humphris, SE; Bryan, WB; Thompson, G et al. (1990): (Table 1) Major and trace element analyses of ODP Site 109-648. https://doi.org/10.1594/PANGAEA.745313
Humphris, SE; Bryan, WB; Thompson, G et al. (1990): (Table 3) Major and trace element analyses of basalts and peridotites from ODP Hole 109-669A and 109-670A. https://doi.org/10.1594/PANGAEA.745315
Humphris, SE; Bryan, WB; Thompson, G et al. (1990): (Table 4) Major element analyses of glasses from samples of Alvin dive 1690. https://doi.org/10.1594/PANGAEA.745317
Humphris, SE; Bryan, WB; Thompson, G et al. (1990): (Table 2) Major and trace element analyses of samples from Alvin dive 1690. https://doi.org/10.1594/PANGAEA.745314