Eruption, Emplacement and Internal Architecture of Massive and Super‐Massive Inflated Submarine Basalt Lava Flows, Walvis Ridge Hotspot Track, IODP Expeditions 391/397T

Abstract Massive submarine basalt flows were sampled at five sites on the Tristan‐Gough‐Walvis hotspot track in the South Atlantic by International Oceanic Discovery Program Expeditions 391/397T, where the plume was interacting with a mid‐ocean ridge, a setting similar to that the of modern Iceland. High resolution XRF core scans document significant internal chemical variations with depth in these flows. Some of this reflects basal olivine accumulation. However, some examples have “scallop‐shaped” patterns that are interpreted to represent influxes of new magma during flow lobe inflation with successive lava injections focused toward the base of the flow unit. Olivine concentration in the deeper parts of the flow is interpreted to reflect top‐down tapping of a vertically zoned magma chamber, with the upper part of the chamber erupting first, and successive eruptive pulses tapping progressively deeper levels of the stratified chamber. The occurrence of massive submarine lava flows requires high eruptive fluxes relative to pillow lava formation. Propagation of these massive flows is favored by (a) high sea water confining pressures, which inhibit vesiculation and keep effective viscosity low and dissolved volatile content high, and (b) chill zones and thick viscoelastic crusts of quenched lava on the flow tops, which effectively insulate the flow interior from ambient temperatures. The formation of a thin film of super‐heated steam on the upper flow surface may similarly enhance the insulation. Evidence suggests that similar massive flows on the seafloor may extend many kilometers from their vents.

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Publication Details

Journal
Geochemistry Geophysics Geosystems
Published
2025-05-28
DOI
https://doi.org/10.1029/2024gc012145
Citations
1
Primary Topic
Geology and Paleoclimatology Research
Type
article
Field-Weighted Citation Impact
1.30
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article

Eruption, Emplacement and Internal Architecture of Massive and Super‐Massive Inflated Submarine Basalt Lava Flows, Walvis Ridge Hotspot Track, IODP Expeditions 391/397T

Katherine E. Potter, Tobias W. Höfig, Daniel E. Heaton, Stephan Homrighausen et al.
1 citations
Geochemistry Geophysics Geosystems
Geology and Paleoclimatology Research
1.30
article

Eruption, Emplacement and Internal Architecture of Massive and Super‐Massive Inflated Submarine Basalt Lava Flows, Walvis Ridge Hotspot Track, IODP Expeditions 391/397T

Katherine E. Potter, Tobias W. Höfig, Daniel E. Heaton, Stephan Homrighausen, Mbili Tshiningayamwe, Kaj Hoernle, Cornelia Class, Wendy R. Nelson, Xiao‐Jun Wang, Yusuke Kubota, David M. Buchs, William W. Sager, John W. Shervais, Jesse Scholpp, Rajneesh Bhutani, Mike Widdowson, Aaron J. Avery, Tao Wu, Bob Duncan, Donald E. White
article en
1 citations

Abstract

Abstract Massive submarine basalt flows were sampled at five sites on the Tristan‐Gough‐Walvis hotspot track in the South Atlantic by International Oceanic Discovery Program Expeditions 391/397T, where the plume was interacting with a mid‐ocean ridge, a setting similar to that the of modern Iceland. High resolution XRF core scans document significant internal chemical variations with depth in these flows. Some of this reflects basal olivine accumulation. However, some examples have “scallop‐shaped” patterns that are interpreted to represent influxes of new magma during flow lobe inflation with successive lava injections focused toward the base of the flow unit. Olivine concentration in the deeper parts of the flow is interpreted to reflect top‐down tapping of a vertically zoned magma chamber, with the upper part of the chamber erupting first, and successive eruptive pulses tapping progressively deeper levels of the stratified chamber. The occurrence of massive submarine lava flows requires high eruptive fluxes relative to pillow lava formation. Propagation of these massive flows is favored by (a) high sea water confining pressures, which inhibit vesiculation and keep effective viscosity low and dissolved volatile content high, and (b) chill zones and thick viscoelastic crusts of quenched lava on the flow tops, which effectively insulate the flow interior from ambient temperatures. The formation of a thin film of super‐heated steam on the upper flow surface may similarly enhance the insulation. Evidence suggests that similar massive flows on the seafloor may extend many kilometers from their vents.

Geochemistry Geophysics GeosystemsVol. 26(6)
Tokyo Institute of Technology (JP), Utah State University (US), Pennsylvania State University (US), Oregon State University (US), University of Nevada, Reno (US), Lamont-Doherty Earth Observatory (US), Pondicherry University (IN), University of Hull (GB), University of Namibia (NA), University of South Florida (US), GEOMAR Helmholtz Centre for Ocean Research Kiel (DE), Northwest University (CN), Discovery Place (US), Towson University (US), University of Houston (US), University of Tennessee at Knoxville (US), Zhejiang University (CN), Cardiff University (GB), Texas A&M University (US), Colorado State University (US)
Openalex Percentile: Top 22%
Geology and Paleoclimatology Research
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