The Stratigraphic and Tectonic development of the Manokwari Area, Irian Jaya

The Manokwari area lies in the northeastern extremity of the Kepala Burung region in the western part of Irian Jaya. In 1976 the area was investigated at the start of an ongoing mapping programme which will be carried out as an Indonesian-Australian integrated geological survey of Irian Jaya. Ten mappable units have been recognised in the area, ranging in age from Silurian to Holocene. The Silurian to Devonian metamorphics crop out in the southern mountainous region, and consist mainly of fine-grained low-grade regionally metamorphosed sedimentary rocks. Along the length of the mountain front these rocks have been intruded and partially assimilated in places by a number of late Permian to middle Triassic granodiorite bodies and a middle Miocene diorite body. Basalt and andesite flow breccia, tuff, and volcaniclastic sediments occur to the southeast, and are probably Oligocene to Miocene in age. Massive algal-foraminiferal biomicrite of Miocene age forms a number of elongate ridges to the northeast of the volcanics and probably unconformably overlies them. In the northeastern part of the area soft, well-bedded mudstone, siltstone and sandstone of late Miocene to Pleistocene age is unconformably overlain by Pleistocene raised reefs. Surrounded by the western part of the extensive alluvial plain is a symmetrical mountain of ?Pliocene agglomerate. Immediately to the south, at the edge of the mountain front is an area of uplifted, dissected, and northerly-tilted coarse alluvium and fanglomerate. The Manokwari area is situated amid a complex array of crustal plates and sub-plates which formed as a result of complicated interaction between the Australian and Pacific Plates and the island arcs and ocean basins of the Indonesian Archipelago. The two major structural elements within the Manokwari Sheet, the Sorong and Ransiki Fault Zones, are continent-island arc collision sutures which have subsequently undergone sinistral transcurrent faulting.

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Date (Publication)
1978-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/80941

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Bureau of Mineral Resources, Geology and Geophysics

 Canberra
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Robinson, G.P.

 1
Author

Ratman Nana

 2
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BMR Journal of Australian Geology and Geophysics

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3:1:19-24

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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2018-11-01T00:00:00
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English
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Australian Government Security ClassificationSystem

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2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified

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urn:uuid/fae9173a-6f8a-71e4-e044-00144fdd4fa6

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English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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AGSO BMR Journal

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Geoscience Australia - short identifier for metadata record with

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eCatId/80941

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-6f8a-71e4-e044-00144fdd4fa6

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2018-04-20T06:10:19
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2014-06-03T00:00:00

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AU/NZS ISO 19115-1:2014

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ISO 19115-1:2014

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ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

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Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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