Citation

Noakes, L.C., Burton, G.M. & Randal, M.A., 1954. The Flowery Gully limestones deposits, Tasmania. Record  1954/065. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

The Flowery Gully Limestone Deposit, twenty miles north of Launceston, was surveyed in detail to delineate the most suitable portions for supplying limestone to the Australian Aluminium Production Commission's plant at Bell Bay, five miles to the north east across the Tamar Estuary. Basic requirements for the limestone were that it lie in an area suitable for quarrying and have as low a silica and magnesium carbonate content as possible so that it could be used efficiently in the aluminium extraction process. The preliminary reconnaissance revealed a stratigraphical chemical control and it was found possible to divide the section measuring 1,700 feet in true thickness into three stratigraphical zones, the topmost of which contains the purest limestone and is most suitable for Bell Bay; the middle zone contains isolated areas of high quality stone. The more detailed survey to reveal quarryable stone in these two zones defined one major and one minor deposit in the upper zone and one minor deposit in the middle. These three deposits contain indicated and inferred reserves totalling 1,000,000 tons; of this figure 100,000 tons has an average grade of 0.4% silica and 5.7% magnesium carbonate and the remainder has a grade not exceeding 0.5% silica and 4% magnesium carbonate. The investigation of the depositional environment revealed quiet and consistent conditions of deposition, which information was used to indicate possible areas for exploration for additional reserves when necessary. Numerous bedded chert nodules are present in the high-silica-content areas of the middle zone. The origin of the silica of this zone was investigated chemically and petrologically, but the results were inconclusive. It was discovered however that practically all silica was syngenetic. It is now mainly in the form of quartz grains and in smaller amounts as a component of the small percentage of clay present; however where chert nodules are present the silica of the cherts is in the form of chalcedony. Areas of marked dolomitization were noted, particularly in the upper and middle zones; they probably represent algal reefs (stromatoporoid bioherms). One of them had a lateral extent of at least 1,600 feet. A distinct disconformity was revealed by the detailed mapping at the top of the limestone section.
Google map showing geographic bounding box with values North bound -41.2 East bound 146.9 West bound 146.7 South bound -41.3
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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)

1954

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Record
economic geology
resource assessment
geology
mineral deposits
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-41.2
East bound
146.9
West bound
146.7
South bound
-41.3

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

a05f7892-8037-7506-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

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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