Territory Stories

Summary of results. Joint NTGS-GA geochronology project: Arunta and Pine Creek regions, July 2006 - May 2007

Details:

Title

Summary of results. Joint NTGS-GA geochronology project: Arunta and Pine Creek regions, July 2006 - May 2007

Creator

Carson, CJ; Claou -Long, JC; Stern, R; Close, DF; Scrimgeour, IR; Glass, LM; Carson, CJ; Claou -Long, JC; Stern, R; Close, DF; Scrimgeour, IR; Glass, LM

Issued by

Northern Territory Geological Survey; Northern Territory Geological Survey

Collection

E-Publications; E-Books; PublicationNT; NTGS Record

Date

2009; 2009

Location

Arunta Region; Aileron Province; Pine Creek Orogen

Notes

Made available via the Publications (Legal Deposit) Act 2004 (NT); Available from GEMIS - Geoscience Exploration and Mining Information System; Made available via the Publications (Legal Deposit) Act 2004 (NT)

Language

English

Subject

Geochronology; Arunta Region; Aileron Province; Pine Creek Orogen

Publisher name

Northern Territory Government; Northern Territory Government

Place of publication

Darwin

Series

NTGS Record

Volume

2009-001

File type

application/pdf

ISBN

9780724571765; 9780724571765

ISSN

1443-1149; 1443-1149

Use

Attribution International 4.0 (CC BY 4.0); 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) and the Commonwealth of Australia (Geoscience Australia).

Copyright owner

Northern Territory Government; Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/; https://creativecommons.org/licenses/by/4.0/

Related links

https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/82449 [GEMIS]; https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/82449

Parent handle

https://hdl.handle.net/10070/794214; https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/82449

Citation address

https://hdl.handle.net/10070/794227

Page content

7 metamorphic rims). Clearly, further study would be required in order to better constrain this conclusion. AlbartaMetamorphics Sample information GAsampleID: 1926343 NTGSsampleID:IC06CJC03 1:250000mapsheet: ILLOGWA CREEK (SF 535) 1:100000mapsheet: QuaRtz (5951) Region: Aileron Province (Arunta Region) Gridreference: 518113mE 7404971mN Formalname: Albarta Metamorphics Lithology: biotite-garnet metapsammite Rock description, notes Sample 926343 was collected from the eastern Albarta Metamorphics, a region dominated by highgrade metasedimentary units. Exposure, in general, is fair to good, with rolling lowlevel hills dissected by steep narrow dry creek channels. The sampled unit is a migmatitic quartzo feldspathic biotitegarnet metapsammite (Figure21) locally interbedded with minor garnetcordierite metapelite (sample 926344). The sampled unit is intensely deformed; rootless isoclinal folding and fold axisparallel shearing with truncated and transposed fold limbs are common. Dismembered and attenuated quartzofeldspathic leucosomes are common. In thin section, the unit comprises a fine-grained (1 mm diameter), equigranular interlocking groundmass dominated by quartz (ca 5060 modal%), subhedral plagioclase (ca 5%) and Kfeldspar (5 0%) with scattered foxybrown biotite (0%). Quartz has irregular serrated grain boundaries and undulose extinction. Biotite defines a well developed fabric. Some green biotite is also present. Garnet is a minor phase and occurs as irregular anhedral grains (50%), associated with clusters of unaligned biotite. Minor secondary muscovite is present (50%). 400 600 800 1000 1200 1400 1600 0.05 0.07 0.09 0.11 2 4 6 8 10 12 14 16 238U/206Pb 20 7 P b/ 20 6 P b 'Larapinta event' lower intercept = 466 28 Ma data-point error ellipses are 2 Granodiorite western Albarta Metamorphics Aileron Province ILLOGWA CREEK GA 1926338 NTGS IC05BDG127a Low Th/U (0.05) metamorphic overgrowth; analysis D.38 A 09 -0 28 .a i 1800 Figure 20. Expanded TeraWasserburg concordia diagram showing all isotopic data from granodiorite, western Albarta Metamorphics (GA 926338; NTGS HA05BDG27a). Physical location of SHRIMP spot D.38 is indicated in inset. Light blue ellipses are analyses shown in Figure19. Figure21.Highgrade biotitegarnet metapsammite (GA 926343; NTGS IC06CJC03), eastern Albarta Metamorphics, facing northeast. Photograph shows sample location for SHRIMP analysis. Sledgehammer for scale.