Geochemistry of basalts from Serocki Volcano

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). Howev...

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Bibliographic Details
Main Authors: Humphris, Susan E, Bryan, Wilfred B, Thompson, Geoffrey, Autio, Laurie K
Format: Dataset
Language:English
Published: PANGAEA 1990
Subjects:
109-648A
109-648B
109-669A
109-670A
Alv_dive_1690
DRILL
Drilling/drill rig
Joides Resolution
Leg109
Mid-Atlantic Ridge
North Atlantic Ocean
Ocean Drilling Program
ODP
Serocki Volcano
Conical Peak
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.745318
https://doi.org/10.1594/PANGAEA.745318
Description
Summary: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.

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