Territory Stories

Woodgreen, Northern Territory : explanatory notes

Details:

Title

Woodgreen, Northern Territory : explanatory notes

Issued by

Northern Territory Geological Survey

Collection

E-Publications; E-Books; PublicationNT; Australia 1:100 000 Geological Map Series

Date

2007

Location

Australia 1:100 000 Geological Map Wood 5458; Australia 1:250 000 Geological MapAlcoota SF5310; Australia 1:250 000 Geological MapAlcoota SF5310

Map scale

1:100 000

Notes

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

Language

English

Subject

Geology; Georgina Basin; Arunta Region

Publisher name

Northern Territory Government; Northern Territory Government

Place of publication

Darwin

Edition

1st ed.

Series

Australia 1:100 000 Geological Map Series

File type

application/pdf

ISBN

9780724571321

ISSN

0811-6296

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

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

Related links

https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/81885 [GEMIS]

Parent handle

https://hdl.handle.net/10070/794795

Citation address

https://hdl.handle.net/10070/794807

Page content

CONTENTS Abstract ............................................................................ iv Introduction ...................................................................... 1 Access and land use........................................................ 1 Regional geological setting............................................. 1 Stratigraphy ...................................................................... 3 Palaeoproterozoic Arunta Region.................................... 3 Mapata Gneiss (LPnm) ................................................. 3 Anira Metamorphics (LPan).......................................... 3 Delny Metamorphics (LPdn)......................................... 4 undivided metamorphic rocks (LPu)............................. 7 Utopia Quartzite (LPut)................................................. 7 Crooked Hole Granite (LPgc) ....................................... 7 Woodgreen Granite Complex (LPgw) .......................... 7 Mollie Granite Complex (LPgm) ................................ 10 undivided granitoid rocks (LPg) ................................. 11 ultramafic intrusive rock (px) ................................... 11 pegmatite (peg) ......................................................... 12 Neoproterozoic to Palaeozoic Georgina Basin .............. 12 Cryogenian ....................................................................... 12 Keepera Group.............................................................. 12 Boko Formation (LPbo) .............................................. 12 Oorabra Arkose (LPor) ............................................... 12 Ediacaran .......................................................................... 14 Mopunga Group............................................................ 14 Elyuah Formation (LPel)............................................. 14 Grant Bluff Formation (LPra) ..................................... 15 Central Mount Stuart Formation (LPst, LPsa)............... 15 Cambrian .......................................................................... 17 Shadow Group .............................................................. 17 Octy Formation (_Clo) ............................................... 17 Narpa Group ................................................................. 18 Chabalowe Formation (_Cmc).................................... 18 Cockroach Group.......................................................... 18 Tomahawk Formation............................................... 18 Fault rock and mylonite (various ages)............................. 19 Quartz breccia (qb) ................................................... 19 Quartz mylonite (qm) ............................................... 19 Mylonite (m)............................................................. 19 Cenozoic ........................................................................... 19 Silcrete (Czs) ............................................................ 19 Ferricrete (Czf) ......................................................... 19 Dissected fans (Czt) .................................................. 19 Waite Formation (Czw) ............................................ 19 Calcrete (Czc) ........................................................... 19 Quartz gravel (Czq) .................................................. 20 Soil over subcrop (Cz/S)........................................... 20 Quaternary sediment (Qc, Qr, Qs, Qp, Qa)............... 20 Structure and metamorphism ....................................... 20 Geophysics....................................................................... 21 Airborne........................................................................ 21 Gravity.......................................................................... 21 Geological history ........................................................... 22 Economic geology ........................................................... 22 Copper, lead, zinc ..................................................... 22 Tantalum, niobium, tin, bismuth............................... 24 Uranium.................................................................... 25 Gold .......................................................................... 25 Diamonds.................................................................. 25 Groundwater ............................................................. 25 Acknowledgements ......................................................... 25 References ....................................................................... 25 Appendix 1. Definitions of new lithostratigraphic units .......27 Appendix 2. NTGS elemental geochemical results ......... 27 FIGURES 1 Location of WOODGREEN.............................................. 1 2 Geological setting of WOODGREEN............................... 2 3 Anira Metamorphics. Granulite-facies metasedimentary rock ................................................... 6 4 Anira Metamorphics. Cordierite-rich metapelite .......... 6 5 Anira Metamorphics. Garnet-bearing metapsammite....... 6 6 Crooked Hole Granite intruding Delny Gneiss ............. 8 7 Woodgreen Granite Complex (LPgw1). Flow- aligned K-feldspar in granite......................................... 9 8 Woodgreen Granite Complex (LPgw1). Clusters of garnet phenocrysts in granite ........................................ 9 9 Woodgreen Granite Complex (LPgw2). Garnet- bearing migmatite ......................................................... 9 10 Woodgreen Granite Complex (LPgw5). Interlayered porphyritic and non-porphyritic phases ...................... 10 11 Woodgreen Granite Complex (LPgw5). Dark porphyritic phase......................................................... 11 12 Boko Formation. Exposure near top of small hill ....... 12 13 Boko Formation. Glacial striations on quartzite clast ..... 13 14 Boko Formation unconformably overlying Utopia Quartzite(?) ..................................................... 13 15 Oorabra Arkose. Arkose overlain by cobble conglomerate............................................................... 14 16 Possible glaciated surface between Utopia Quartzite(?) and overlying Oorabra Arkose................ 14 17 Grant Bluff Formation. Tabular white sandstone and quartzite................................................................ 15 18 Tops Member of Central Mount Stuart Formation. Exploration costean..................................................... 17 19 Chabalowe Formation(?). Chert float with relict stromatolites................................................................ 18 20 Woodgreen Granite Complex. Well developed S-C fabric in mylonitised granite ................................ 21 21 Mount Skinner geological sketch map........................ 23 TABLES 1 Lithostratigraphy of Arunta Region .............................. 4 2 Lithostratigraphy of Georgina Basin............................. 5 3 Cenozoic lithostratigraphy ............................................ 5 iii