Abstract

During a geological reconnaissance of Manus Island, nodular bauxite deposits were observed in three widely separated localities. The occurrences are not laterally connected. Two are derived from basaltic flows and the third is formed over a medium-grained rock probably of tuffaceous origin. These volcanic rocks are products of a comparatively recent vulcanism and they unconformably overlie recrystallised limestones and marine tuffaceous sediments deposited on a plutonic basement. Palaeontological evidence of the age of these sediments is lacking but it is probable that they are Miocene or younger. The volcanics are sub-horizontal or possess a low primary dip determined by the underlying surfaces. The process of bauxitization has been more rapid than usual indicating that physiographic and petrographic conditions have been particularly favourable. Present day conditions of high temperatures, high rainfall and slow drainage are recognised as favourable. It is probable that these conditions have prevailed since the volcanics were laid down and that bauxitization is still proceeding. Regional considerations suggest that the bauxites will be widespread, particularly over the western end of the island. The deposits described were only observed as residual concentrations of bauxite nodules at the surface. They have not been tested as depth. The results of analyses of individual nodules from two of the deposits show a high available alumina content. Further prospecting and testing at depth, particularly in the west, is strongly recommended.
Google map showing geographic bounding box with values North bound -1.9 East bound 147.5 West bound 146.5 South bound -2.3
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1952-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

9310 Product http://www.ga.gov.au/metadata-gateway/metadata/record/9310/

Keywords

GA Publication
Record
geology
topography
stratigraphy
structural geology
mineral deposits
PG
Geology

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-1.9
East bound
147.5
West bound
146.5
South bound
-2.3

Lineage

Legacy product, lineage not available

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

Legacy product, source data not available.

Metadata File Identifier

a05f7892-80af-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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