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    <title>UTas ePrints - Geochemistry and geothermometry of volcanic rocks from Serra Branca, Iberian Pyrite Belt, Portugal</title>
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<meta content="Zr thermometry; calc-alkaline rocks; attenuated continental lithosphere, Iberian Pyrite Belt; Volcanogenic massive sulfide deposit; Zircon saturation temperatures; Porphyry; Volcanic" name="eprints.keywords" />
<meta content="Volcanic rocks from Serra Branca, Iberian Pyrite Belt, Portugal, consist of calc-alkaline felsic and intermediate rocks. The latter are massive andesites, whereas the former include four dacitic to rhyolitic lithologies, distinguishable on spiderdiagrams and binary plots of immobile elements. Zircon thermometry indicates that two felsic suites may have formed from different magmas produced at distinct temperatures, with only limited fractionation within each suite. Alternatively, all the felsic rocks can be related through fractionation of a single magma if the lower zircon saturation temperature obtained for one suite merely results from Zr dilution, mostly reflecting silicification.
The relatively high magma temperatures at Serra Branca ease the classification of felsic rocks based on their HFSE contents and also indicate volcanogenic massive sulfide deposit favorability. This contrasts with other areas of the Belt that register lower magma temperatures and are subsequently barren. However, magma temperatures may have not been high enough to cause complete melting of refractory phases in which HFSE reside during crustal fusion of an amphibolite protolith, implying difficult discrimination of tectonic environments for the felsic rocks. The intermediate rocks were possibly formed by mixing between basaltic magmas and crustal material, compatible with volcanism in an attenuated continental lithosphere setting." name="eprints.abstract" />
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<meta content="Barrie, C.T., 1995. Zircon thermometry of high-temperature rhyolites near volcanic-associated massive sulfide deposits, Abitibi subprovince, Canada. Geology 23, 169-172.
Barrie, C.T., Amelin, Y., Pascual, E., 2002. U-Pb geochronology of VMS mineralization in the Iberian Pyrite Belt. Mineralium Deposita 37, 684-703.
Dawson, G.L., Barret, T.J., Caessa, P., Alverca, R., 2001. The Feitais polymetallic massive sulphide deposit, southern Portugal. In: Tornos, F., Pascual, E., Saez, R., Hidalgo, R. (Eds.), Massive Sulphide Deposits in the
Iberian Pyrite Belt: New Advances and Comparison with Equivalent Systems: Proceedings of GEODE workshop, Aracena, Spain, October 2001. Geode-Univ. of Huelva, p. 15.
Hart, T.R., Gibson, H.L., Lesher, C.M., 2004. Trace element geochemistry and petrogenesis of felsic volcanic rocks associated with volcanogenic massive Cu-Zn-Pb sulfide deposits. Economic Geology 99, 1003-1013.
Ishikawa, Y., Sawaguchi, T., Iwaya, S., Horiuchi, M., 1976. Delineation of prospecting targets for Kuroko deposits based on modes of volcanism of underlying dacite and alteration halos. Mining Geology 26, 105-117.
Jenner, G.A., 1996. Trace element geochemistry of igneous rocks: geochemical nomenclature and analytical geochemistry. In: Wyman, D.A. (Ed.), Trace Element Geochemistry of Volcanic Rocks: Applications for Massive
Sulphide Exploration. Geological Association of Canada Short Course Notes, vol. 12, pp. 51-79.
Large, R.R., Gemmell, J.B., Paulick, H., Huston, D.L., 2001. The alteration box plot: a simple approach to understanding the relationship between alteration
mineralogy and litogeochemistry associated with volcanic-hosted massive sulfide deposits. Economic Geology 96, 957-971.
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MacLean, W.H., Barrett, T.J., 1993. Lithogeochemical techniques using immobile elements. Journal of Geochemical Exploration 48, 109-133.
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McDonough, W.F., Sun, S.S., 1995. The composition of the Earth. Chemical Geology 120, 223-253.
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Rosa, D.R.N., Inverno, C.M.C., Oliveira, V.M.J., Rosa, C.J.P., 2004. Geochemistry of volcanic rocks, Albernoa area, Iberian Pyrite Belt. International Geology Review 46, 366-383.
Rosa, D.R.N., Inverno, C.M.C., Oliveira, V.M.J., Rosa, C.J.P., 2005. Zircon and monazite saturation temperatures as tools for the recognition of VMS favorable environments: examples from the Iberian Pyrite Belt
(Portugal). Actas do VIII Congresso Nacional de Geoquimica, Aveiro, Portugal, pp. 89-93.
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Pyrite Belt. In: Blundell, D.J., Neubauer, F., von Quadt, A. (Eds.), The Timing and Location of Major Ore Deposits in an Evolving Orogen. Geological Society of London, Special Publications, vol. 204, pp. 179-198.
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Chemical Geology 20, 325-343." name="eprints.referencetext" />
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<meta content="Volcanic rocks from Serra Branca, Iberian Pyrite Belt, Portugal, consist of calc-alkaline felsic and intermediate rocks. The latter are massive andesites, whereas the former include four dacitic to rhyolitic lithologies, distinguishable on spiderdiagrams and binary plots of immobile elements. Zircon thermometry indicates that two felsic suites may have formed from different magmas produced at distinct temperatures, with only limited fractionation within each suite. Alternatively, all the felsic rocks can be related through fractionation of a single magma if the lower zircon saturation temperature obtained for one suite merely results from Zr dilution, mostly reflecting silicification.
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    <h1 class="ep_tm_pagetitle">Geochemistry and geothermometry of volcanic rocks from Serra Branca, Iberian Pyrite Belt, Portugal</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Rosa, D.R.N.</span> and <span class="person_name">Inverno, C.M.C.</span> and <span class="person_name">Oliveira, V.M.J.</span> and <span class="person_name">Rosa, Carlos J.P.</span> (2006) <xhtml:em>Geochemistry and geothermometry of volcanic rocks from Serra Branca, Iberian Pyrite Belt, Portugal.</xhtml:em> Gondwana Research, 10 (3-4). pp. 328-339.</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/1346/1/Drosa_et_al200671.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/1346/1/Drosa_et_al200671.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />1375Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1016/j.gr.2006.03.008">http://dx.doi.org/10.1016/j.gr.2006.03.008</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Volcanic rocks from Serra Branca, Iberian Pyrite Belt, Portugal, consist of calc-alkaline felsic and intermediate rocks. The latter are massive andesites, whereas the former include four dacitic to rhyolitic lithologies, distinguishable on spiderdiagrams and binary plots of immobile elements. Zircon thermometry indicates that two felsic suites may have formed from different magmas produced at distinct temperatures, with only limited fractionation within each suite. Alternatively, all the felsic rocks can be related through fractionation of a single magma if the lower zircon saturation temperature obtained for one suite merely results from Zr dilution, mostly reflecting silicification.&#13;
The relatively high magma temperatures at Serra Branca ease the classification of felsic rocks based on their HFSE contents and also indicate volcanogenic massive sulfide deposit favorability. This contrasts with other areas of the Belt that register lower magma temperatures and are subsequently barren. However, magma temperatures may have not been high enough to cause complete melting of refractory phases in which HFSE reside during crustal fusion of an amphibolite protolith, implying difficult discrimination of tectonic environments for the felsic rocks. The intermediate rocks were possibly formed by mixing between basaltic magmas and crustal material, compatible with volcanism in an attenuated continental lithosphere setting.</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">Zr thermometry; calc-alkaline rocks; attenuated continental lithosphere, Iberian Pyrite Belt; Volcanogenic massive sulfide deposit; Zircon saturation temperatures; Porphyry; Volcanic</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/260300.html">260000 Earth Sciences &gt; 260300 Geochemistry</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260103.html">260000 Earth Sciences &gt; 260100 Geology &gt; 260103 Vulcanology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences &gt; 260100 Geology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260000.html">260000 Earth Sciences</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1346</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">09 Jul 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</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=1346;">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&amp;eprintid=1346">item control page</a></p>
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