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FIELD CHARACTERISTICS AND EROSIONAL PROCESSES ASSOCIATED WITH KOMATIITIC LAVAS: IMPLICATIONS FOR FLOW BEHAVIOR
| Citations: | 3 - 1 self |
BibTeX
@MISC{F_fieldcharacteristics,
author = {Ray A. F and Cas and Steve W. Beresford},
title = {FIELD CHARACTERISTICS AND EROSIONAL PROCESSES ASSOCIATED WITH KOMATIITIC LAVAS: IMPLICATIONS FOR FLOW BEHAVIOR},
year = {}
}
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Abstract
Although komatiitic lavas have long been depicted as turbulent flows, especially near the vent, field characteristics indicate that many komatiitic lavas did not flow turbulently, or only initially so. The bases of komatiites are commonly conformable with their substrate, including fine pelitic sediments, and the margins of komatiites are overwhelmingly coherent, or marked by local quench-fragmented hyaloclastite breccia. Autobreccias are notably missing. These characteristics are not consistent with turbu-lent flow, but clearly indicate conditions of laminar flow. If komatiitic flows were turbulent, they should commonly have scoured into substrate sediments through a variety of physical erosion processes, including foundering into underlying seafloor sediments, because of density inversion, and turbulence-induced scouring of sediments. These features are not commonly developed, also indicating that generally komatiites were emplaced under tranquil, laminar-flow conditions. Trough-like structures that com-monly host nickel sulfide mineralization have commonly been interpreted to originate by thermal erosion of substrate by the komatiitic lava. The evidence supporting thermal erosion is not strong, and commonly ambiguous. Trough structures at Kambalda, Western Australia, are fault bounded, as noted by several previous investigators. However, there is a common, but not universal, antithetic relationship between trough presence and sediment absence. Removal of sediment from troughs could be explained by physical erosion, with an initial narrow, turbulent flow-head scouring a channel in the underlying sediments. As the lava flows spread laterally, their flow-front velocity decreased, and flow became laminar, so explaining the conformable contacts with
Keyphrases
flow behavior thermal erosion komatiitic lava turbu-lent flow field characteristic local quench-fragmented hyaloclastite breccia turbulence-induced scouring several previous investigator antithetic relationship trough-like structure trough structure physical erosion komatiitic flow density inversion many komatiitic lava sediment absence substrate sediment laminar flow physical erosion process trough presence fine pelitic sediment western australia seafloor sediment underlying sediment flow-front velocity laminar-flow condition indicate condition com-monly host nickel sulfide mineralization initial narrow conformable contact
