Origin and evolution of Lord Howe Island, Southwest Pacific Ocean
作者:
Ian McDougall,
B. J. J. Embleton,
D. B. Stone,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1981)
卷期:
Volume 28,
issue 1-2
页码: 155-176
ISSN:0016-7614
年代: 1981
DOI:10.1080/00167618108729154
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Lord Howe Island is the eroded remnant of a large shield volcano. Tholeiitic lavas of the North Ridge Basalt comprise the main shield building phase and were erupted about 6.9 Ma ago. The Boat Harbour Breccia probably formed within the throat of the volcano and, together with the North Ridge Basalt, is intruded by numerous basaltic dykes, which grade into a cone sheet complex near the main vent. Large scale collapse of the summit area of the volcano produced a caldera which was filled rapidly by lavas of the Mount Lidgbird Basalt some 6.4 Ma ago, bringing to a close the volcanic history of Lord Howe Island. The shield volcano thus was built during a short interval in the late Miocene.
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