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GEOREF RECORD

Crustal Extension between the Tonga and Lau Ridges; Petrologic and Geophysical Evidence

John G. Sclater, James W. Hawkins, Jacqueline Mammerickx and Clement G. Chase
Crustal Extension between the Tonga and Lau Ridges; Petrologic and Geophysical Evidence
Geological Society of America Bulletin (1972) 83 (2): 505-517

Abstract

The Lau Basin, which lies between the Tonga and Lau Ridges, is characterized by an absence of sediment, high but variable heat flow, and a confused magnetic anomaly pattern. A ridge 300 km long and 40 km wide runs northwest-southeast through the western part of the basin. This ridge is composed of fresh tholeiitic basalt and is associated with a linear band of shallow-focus earthquakes ( < 70 km). Chemical analysis of unaltered glassy and aphanitic phenocryst-free pillow fragments indicates that the parent liquids may have been derived from mantle depths of about 50 km.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 83
Serial Issue: 2
Title: Crustal Extension between the Tonga and Lau Ridges; Petrologic and Geophysical Evidence
Pages: 505-517
Published: 1972
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1972-008243
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. (incl. sketch maps)
S25°00'00" - S16°00'00", W179°00'00" - W173°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1972
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