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<title>UTas ePrints - Geochemistry and age of magmatic rocks in the unexposed Narromine, Cowal and Fairholme Igneous Complexes in the Ordovician Macquarie Arc, New South Wales</title>
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<meta content="Crawford, A.J." name="eprints.creators_name" />
<meta content="Cooke, D.R." name="eprints.creators_name" />
<meta content="Fanning, C.M." name="eprints.creators_name" />
<meta content="Tony.Crawford@utas.edu.au" name="eprints.creators_id" />
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<meta content="Geochemistry and age of magmatic rocks in the unexposed Narromine, Cowal and Fairholme Igneous Complexes in the Ordovician Macquarie Arc, New South Wales" name="eprints.title" />
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<meta content="Cowal Igneous Complex, Fairholme Igneous Complex, geochemistry, geochronology, Macquarie arc, Narromine Igneous Complex." name="eprints.keywords" />
<meta content="Much of the northern and southern sections of the Junee-Narromine Volcanic Belt of the Ordovician Macquarie Arc in central-western New South Wales are buried beneath the sediment cover of the Great Artesian Basin. Exploration drilling of these aeromagnetically defined blocks has provided important new material to assess the temporal and magmatic affinities of the rocks in the Narromine Igneous Complex (northern end) and the Cowal and Fairholme Igneous Complexes (southern end). Basement rocks are representative of Phase 1 magmatism in the Macquarie Arc, and consist of Lower Ordovician basalts and andesites and common volcaniclastic rocks, all with high-K calc-alkaline affinities. These are very similar compositionally to the Lower Ordovician Nelungaloo Volcanics that outcrop in the central part of the Junee-Narromine Volcanic Belt west of Parkes. Intruding the basement volcanic-volcaniclastic
package are three distinct igneous suites. The oldest of these, dated at ca 466-460 Ma (Middle Ordovician) and representative of Phase 2 magmatism in the Macquarie Arc, consists of stocks of monzogabbro, monzodiorite and monzonite with high-K calc-alkaline affinities, and is well represented in the Narromine and Cowal Igneous Complexes. Phase 2 suite rocks were, in turn, intruded in the
Bolindian (445 plus or minus 5 Ma) by kilometre-size stocks, narrow sheets and dykes made up of hornblende gabbro, diorite and granodiorite, and including quartz+plagioclase+hornblende-phyric dacitic porphyries in the Narromine Igneous Complex. These medium-K calc-alkaline rocks, assigned to the Phase 3 Copper Hill Suite that also occurs in the Molong and Rockley-Gulgong Volcanic Belts further east, crystallised from andesitic or more evolved magmas, probably derived via partial melting of low-K
rocks in the arc basement, or amphibolites in the subducting slab. The youngest rocks in these igneous
complexes are believed to be the high-level shoshonitic intrusives in the Cowal and Fairholme Igneous
Complexes, which are correlated on petrographic and compositional grounds with the Macquarie Arc
Phase 4 (Bolindian and Llandovery) magmatic products best represented by the Northparkes Igneous Complex in the central part of the Junee-Narromine Volcanic Belt." name="eprints.abstract" />
<meta content="2007-03" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Australian Journal of Earth Sciences" name="eprints.publication" />
<meta content="54" name="eprints.volume" />
<meta content="2 & 3" name="eprints.number" />
<meta content="243-271" name="eprints.pagerange" />
<meta content="10.1080/08120090701221714" name="eprints.id_number" />
<meta content="UNSPECIFIED" name="eprints.thesis_type" />
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<meta content="BASTRAKOV E. 1998. Gold mineralisation at the Lake Cowal prospect, New South Wales. PhD thesis, Australian National University, Canberra (unpubl.).
BLEVIN P. L. 2002. The petrographic and compositional character of variably K-enriched magmatic suites associated with Ordovician porphyry Cu-Au mineralisation in the Lachlan Fold Belt, Australia. Mineralium Deposita 37, 87-99.
BOYNTON W. V. 1984. Geochemistry of the rare earth elements:
meteorite studies. In: Henderson P. ed. Rare Earth Element
Geochemistry, pp. 63-114. Elsevier, Amsterdam.
BUTERA K. M., WILLIAMS I. S., BLEVIN P. L. & SIMPSON C. J. 2001. Zircon U-Pb dating of Early Palaeozoic monzonitic intrusives from the Goonumbla area, New South Wales. Australian Journal of Earth Sciences 48, 457-464.
BYWATER A., WILLIAMS S., MCINNES P. & DIJKMANS V. 2004.
Developments at the Cowal gold project. In: Bierlien F. P. &
Hough M. A. eds. Tectonics to Mineral Discovery-Deconstructing the Lachlan Orogen, pp. 77-82. Geological Society of Australia Abstracts 74.
COOKE D. R., WILSON A. J., HOUSE M. J., WOLFE R. C., WALSHE J. L., LICKFOLD V. & CRAWFORD A. J. 2007. Alkalic porphyry Au-Cu and associated mineral deposits of the Ordovician to Early Silurian Macquarie Arc, New South Wales. Australian Journal of Earth Sciences 54, 445-463.
CRAWFORD A. J., MEFFRE S., SQUIRE R. J., BARRON L. M. & FALLOON T. J. 2007. Middle and Late Ordovician magmatic evolution of the Macquarie Arc, Lachlan Orogen, New South Wales. Australian Journal of Earth Sciences 54, 181-214.
DEFANT M. J. & DRUMMOND M. S. 1990. Derivation of some modern arc magmas by melting of young subducted lithosphere. Nature 347, 662-665.
DIREEN N. G., LYONS P., KORSCH R. J. & GLEN R. A. 2001. Integrated geophysical appraisal of crustal architecture in the eastern Lachlan Orogen. Exploration Geophysics 32, 252-262.
FORSTER D. A., SECCOMBE P. K. & PHILLIPS D. 2004. Controls on skarn alteration and mineralization at the Cadia deposits, New South Wales, Australia. Economic Geology 99, 761-788.
GIRVAN S. W. 1992. Geology and mineralisation of the Copper Hill porphyry copper-gold deposits near Molong, New South Wales. BSc (Hons) thesis, Australian National University, Canberra, (unpubl.).
GLEN R. A., CRAWFORD A. J. & COOKE D. R. 2007a. Tectonic setting of porphyry Cu-Au mineralisation in the Ordovician-
Early Silurian Macquarie Arc, Eastern Lachlan Orogen,
New South Wales. Australian Journal of Earth Sciences 54,
465-479.
GLEN R. A., CRAWFORD A. J., PERCIVAL I. G. & BARRON L. M. 2007b. Early Ordovician development of the Macquarie Arc, Lachlan Orogen, New South Wales. Australian Journal of Earth Sciences 54, 167-179.
GLEN R. A., MEFFRE S. & SCOTT R. J. 2007c. Benambran Orogeny in the Eastern Lachlan Orogen, Australia. Australian Journal of Earth Sciences 54, 385-415.
GLEN R. A., SPENCER R., WILLMORE A., DAVID V. & SCOTT R. J. 2007d. Junee-Narromine Volcanic Belt, Macquarie Arc, Lachlan Orogen, New South Wales: components and structure. Australian Journal of Earth Sciences 54, 215-241.
LICKFOLD V., COOKE D. R., CRAWFORD A. J. & FANNING C. M. 2007. Shoshonitic magmatism and formation of the Northparkes
porphyry Cu-Au deposits, New South Wales. Australian Journal
of Earth Sciences 54, 417-444.
LICKFOLD V., COOKE D. R., SMITH S. G. & ULLRICH T. D. 2003.
Endeavour copper-gold porphyry deposits, Northparkes, New
South Wales: intrusive history and fluid evolution. Economic
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LYONS P. & WALLACE D. 1999. Geology and metallogenesis of the Parkes-Grenfell-Wyalong-Condobolin region, New South
Wales. Forbes 1:250 000 Geological Sheet and Conference Guide. Australian Geological Survey Organisation Record 1999/20.
MEFFRE S., SCOTT R. J., GLEN R. A. & SQUIRE R. J. 2007. Re-evaluation of contact relationships between Ordovician volcanic belts and the quartz-rich turbidites of the Lachlan Orogen. Australian Journal of Earth Sciences 54, 363-383.
MILES I. N. & BROOKER M. R. 1998. Endeavour 42 deposit, Lake Cowal, New South Wales: a structurally controlled gold deposit. Australian Journal of Earth Sciences 45, 837-847.
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Silurian history of the Macquarie Arc, Lachlan Orogen, New
South Wales. Australian Journal of Earth Sciences 54, 143-165.
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Sydney.
SIMPSON C. J., CAS R. A. F. & ARUNDELL M. C. 2005. Volcanic
evolution of a long-lived Ordovician island arc province in the Parkes region of the Lachlan Fold Belt, southeastern Australia. Australian Journal of Earth Sciences 52, 863-886.
SIMPSON C. J., SCOTT R. J., CRAWFORD A. J. & MEFFRE S. 2007.
Volcanology, geochemistry and structure of the Ordovician
Cargo Volcanics in the Cargo-Walli region, central New South
Wales. Australian Journal of Earth Sciences 54, 315-352.
SQUIRE R. J. & CRAWFORD A. J. 2007. Magmatic characteristics and geochronology of Ordovician igneous rocks from the Cadia-Neville region, New South Wales: implications for tectonic evolution. Australian Journal of Earth Sciences 54, 293-314.
SUN S-S. & MCDONOUGH W. F. 1989. Chemical and isotopic
systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders A. D. & Norry M. J. eds. Magmatism in the Ocean Basins, pp. 313-345. Geological Society of London Special Publication 42.
WATSON E. B. & HARRISON T. M. 1983. Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types. Earth and Planetary Science Letters 64, 295-304." name="eprints.referencetext" />
<meta content="Crawford, A.J. and Cooke, D.R. and Fanning, C.M. (2007) Geochemistry and age of magmatic rocks in the unexposed Narromine, Cowal and Fairholme Igneous Complexes in the Ordovician Macquarie Arc, New South Wales. Australian Journal of Earth Sciences, 54 (2 & 3). pp. 243-271. ISSN 0812-0099" name="eprints.citation" />
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<meta content="Crawford, A.J." name="DC.creator" />
<meta content="Cooke, D.R." name="DC.creator" />
<meta content="Fanning, C.M." name="DC.creator" />
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<meta content="Much of the northern and southern sections of the Junee-Narromine Volcanic Belt of the Ordovician Macquarie Arc in central-western New South Wales are buried beneath the sediment cover of the Great Artesian Basin. Exploration drilling of these aeromagnetically defined blocks has provided important new material to assess the temporal and magmatic affinities of the rocks in the Narromine Igneous Complex (northern end) and the Cowal and Fairholme Igneous Complexes (southern end). Basement rocks are representative of Phase 1 magmatism in the Macquarie Arc, and consist of Lower Ordovician basalts and andesites and common volcaniclastic rocks, all with high-K calc-alkaline affinities. These are very similar compositionally to the Lower Ordovician Nelungaloo Volcanics that outcrop in the central part of the Junee-Narromine Volcanic Belt west of Parkes. Intruding the basement volcanic-volcaniclastic
package are three distinct igneous suites. The oldest of these, dated at ca 466-460 Ma (Middle Ordovician) and representative of Phase 2 magmatism in the Macquarie Arc, consists of stocks of monzogabbro, monzodiorite and monzonite with high-K calc-alkaline affinities, and is well represented in the Narromine and Cowal Igneous Complexes. Phase 2 suite rocks were, in turn, intruded in the
Bolindian (445 plus or minus 5 Ma) by kilometre-size stocks, narrow sheets and dykes made up of hornblende gabbro, diorite and granodiorite, and including quartz+plagioclase+hornblende-phyric dacitic porphyries in the Narromine Igneous Complex. These medium-K calc-alkaline rocks, assigned to the Phase 3 Copper Hill Suite that also occurs in the Molong and Rockley-Gulgong Volcanic Belts further east, crystallised from andesitic or more evolved magmas, probably derived via partial melting of low-K
rocks in the arc basement, or amphibolites in the subducting slab. The youngest rocks in these igneous
complexes are believed to be the high-level shoshonitic intrusives in the Cowal and Fairholme Igneous
Complexes, which are correlated on petrographic and compositional grounds with the Macquarie Arc
Phase 4 (Bolindian and Llandovery) magmatic products best represented by the Northparkes Igneous Complex in the central part of the Junee-Narromine Volcanic Belt." name="DC.description" />
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<h1 class="ep_tm_pagetitle">Geochemistry and age of magmatic rocks in the unexposed Narromine, Cowal and Fairholme Igneous Complexes in the Ordovician Macquarie Arc, New South Wales</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Crawford, A.J.</span> and <span class="person_name">Cooke, D.R.</span> and <span class="person_name">Fanning, C.M.</span> (2007) <xhtml:em>Geochemistry and age of magmatic rocks in the unexposed Narromine, Cowal and Fairholme Igneous Complexes in the Ordovician Macquarie Arc, New South Wales.</xhtml:em> Australian Journal of Earth Sciences, 54 (2 & 3). pp. 243-271. ISSN 0812-0099</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/1389/1/Crawford%2C_Cooke%2C_Fanning_AJES_2006.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1389/1/Crawford%2C_Cooke%2C_Fanning_AJES_2006.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />3756Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="1785" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1080/08120090701221714">http://dx.doi.org/10.1080/08120090701221714</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Much of the northern and southern sections of the Junee-Narromine Volcanic Belt of the Ordovician Macquarie Arc in central-western New South Wales are buried beneath the sediment cover of the Great Artesian Basin. Exploration drilling of these aeromagnetically defined blocks has provided important new material to assess the temporal and magmatic affinities of the rocks in the Narromine Igneous Complex (northern end) and the Cowal and Fairholme Igneous Complexes (southern end). Basement rocks are representative of Phase 1 magmatism in the Macquarie Arc, and consist of Lower Ordovician basalts and andesites and common volcaniclastic rocks, all with high-K calc-alkaline affinities. These are very similar compositionally to the Lower Ordovician Nelungaloo Volcanics that outcrop in the central part of the Junee-Narromine Volcanic Belt west of Parkes. Intruding the basement volcanic-volcaniclastic
package are three distinct igneous suites. The oldest of these, dated at ca 466-460 Ma (Middle Ordovician) and representative of Phase 2 magmatism in the Macquarie Arc, consists of stocks of monzogabbro, monzodiorite and monzonite with high-K calc-alkaline affinities, and is well represented in the Narromine and Cowal Igneous Complexes. Phase 2 suite rocks were, in turn, intruded in the
Bolindian (445 plus or minus 5 Ma) by kilometre-size stocks, narrow sheets and dykes made up of hornblende gabbro, diorite and granodiorite, and including quartz+plagioclase+hornblende-phyric dacitic porphyries in the Narromine Igneous Complex. These medium-K calc-alkaline rocks, assigned to the Phase 3 Copper Hill Suite that also occurs in the Molong and Rockley-Gulgong Volcanic Belts further east, crystallised from andesitic or more evolved magmas, probably derived via partial melting of low-K
rocks in the arc basement, or amphibolites in the subducting slab. The youngest rocks in these igneous
complexes are believed to be the high-level shoshonitic intrusives in the Cowal and Fairholme Igneous
Complexes, which are correlated on petrographic and compositional grounds with the Macquarie Arc
Phase 4 (Bolindian and Llandovery) magmatic products best represented by the Northparkes Igneous Complex in the central part of the Junee-Narromine Volcanic Belt.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Cowal Igneous Complex, Fairholme Igneous Complex, geochemistry, geochronology, Macquarie arc, Narromine Igneous Complex.</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences > 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1389</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Mrs Katrina Keep</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">26 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">23 Jan 2008 14:53</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1389;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1389">item control page</a></p>
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