Citation

Exon, N.F., 1995. Cruise Proposal : AGSO Cruise 147 : Stratigraphy, Tectonic History and Palaeoclimate of the Offshore Tasmanian Region. Record  1995/001. Australian Geological Survey Organisation, Canberra.

Abstract

The Tasmanian region's geological history bears on the history of the entire southern margin of Australia. The southern margin is already a major producer of petroleum from the Upper Cretaceous and Paleocene sequences in the Gippsland Basin, and has given encouraging exploration results in several other basins. The Otway Basin, in particular, is the scene of major recent offshore gas discoveries in the Cretaceous sequence. Both the west Tasmanian margin and the South Tasman Rise have petroleum potential. The targets on the forthcoming Rig Seismic sampling cruise of 31 days (AGSO Cruise 147) are on the west Tasmanian margin, the South Tasman Rise, the East Tasman Rise, and the adjacent oceanic areas. The general bathymetry of the region is shown in Figure 1. The targets were defined by the early 1994 Tasmante cruise (Exon et al., 1994), which used the French research vessel l' Atalante on an exchange basis to swath-map the sea bed. About two-thirds of both the South Tasman Rise (STR) and the west Tasmanian margin were mapped, an areal coverage exceeding 200 000 km 2. The very accurate 1:250 000 scale bathymetric maps and sonar images arising from the Tasmante survey provide an unequalled source of structural information. A simplified bathymetric map of the region, based largely on the Tasmante swath-mapping, is shown in Figure 2. The aim of the present sampling cruise is to ground truth the maps and ideas arising from the Tasmante cruise. It is designed to sample basement and Phanerozoic sedimentary rocks in all three continental blocks, Cainozoic volcanics in continental and oceanic terrains, and Cainozoic sediments on the continental blocks, by dredging and coring. This will help elucidate the Phanerozoic history of the area with emphasis on petroleum geology and plate tectonic hisory, and also the Cainozoic and especially Quaternary history with emphasis on plate tectonic history, and changes in climate and sedimentation patterns. Water column sampling is designed to provide more information about oceanographic controls on sedimentation. An additional aim is to sample manganese nodules in deep water to assess them as a potential resource, by the use of free-fall grabs. As a result of interest in the volcanic cones about 100 km of Hobart, mapped during the Tasmante cruise, which define major fishing grounds, two photographic profiles and one dredge are planned for there. The main sampling areas are discussed briefly below.
Google map showing geographic bounding box with values North bound -43.0 East bound 150.0 West bound 144.0 South bound -48.0
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Product Type/Sub Type

dataset - GA Publication - Record

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1995

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Record
marine
marine survey
structural geology
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-43.0
East bound
150.0
West bound
144.0
South bound
-48.0

Lineage

Legacy product, lineage not available

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

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

Metadata File Identifier

a05f7892-7451-7506-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 Date Stamp

1996-10-30

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays