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Title: Summary of results. Joint NTGS-GA geochronology project: Balbirini Dolostone, southern McArthur Basin, June 2019-September 2019
Report ID: NTGS Record 2020-002
Year: 2020
Author: Kositcin, N
Munson, TJ
Geological Province: McArthur Basin
Map250: Bauhinia Downs SE5303
Map100: Mallapunyah 6064
Subject: Geochronology
Stratigraphy: Nathan Group
Balbirini Dolostone
Abstract: Two new U-Pb SHRIMP zircon geochronological results derived from two samples of the Balbirini Dolostone (southern McArthur Basin, Northern Territory) are presented herein. The two samples were collected in June 2019 from the type section of the Balbirini Dolostone in Mallapunyah, southern BAUHINIA DOWNS.
The Balbirini Dolostone, part of the early Mesoproterozoic Nathan Group, is a thick unit of interbedded dolostone and dolomitic siliciclastic rocks that include evaporitic redbeds. A sample from the base of the Balbirini Dolostone (base 'evaporitic unit') yielded an interpreted maximum depositional age (MDA) of 1625 +/- 14 Ma. A sample from the medial Balbirini Dolostone (base 'stromatolitic unit') returned an interpreted MDA of 1607 +/-6 Ma.
Publisher: Northern Territory Geological Survey
ISSN: 1443-1149
ISBN: 9780724573622 (PDF)
Document Type: NTGS Record
Access Constraint: Creative Commons Attribution 4.0 International (CC BY 4.0). Please observe and retain any copyright or related notices that accompany this material and give attribution to: Northern Territory of Australia (Northern Territory Geological Survey).
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