Authors / CoAuthors
Abell, R.S. | Falkland, A.C.
Abstract
Norfolk Island in the southwest Pacific Ocean has an area of 35 k m2 and rises to an altitude of just over 300 m. It is an erosional remnant of a volcanic complex consisting of subaerial basaltic lava flows and pyroclastics built on a submarine pile of hyaloclastite deposits and pillow lavas. A deep weathering profile has developed in the volcanic succession since eruptive activity ceased during the late Pliocene 2.3 Ma ago. Throughout the island there is an upper water table aquifer in porous alluvium and weathered basaltic rock. At the base of the weathered profile groundwater moves towards sea level through a complex network of fractures and other interconnected openings in volcanic bedrock. Semi-confined aquifers occur in fractured basalt flows and interbedded basaltic pyroclastics (tuffs and agglomerates). However, the extent and quality of deep groundwater below sea level needs more evaluation. The groundwater storage on Norfolk Island is tapped by more than 450 wells and bores.
Product Type
document
eCat Id
31
Contact for the resource
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Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- GA PublicationBulletin
- ( Theme )
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- hydrogeology
- ( Theme )
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- marine
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- NF
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1991-01-01T00:00:00
Creation Date
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Purpose
Maintenance Information
unknown
Topic Category
geoscientificInformation
Series Information
Bulletin 234
Lineage
Unknown
Parent Information
Extents
[-29.04, -28.75, 167.55, 168.0]
Reference System
Spatial Resolution
Service Information
Associations
Source Information
Source data not available.