Research Article| March 01, 2005 Major orogenic gold episode associated with Cordilleran-style tectonics related to the assembly of Paleoproterozoic Australia? A. Kerim Şener; A. Kerim Şener 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Carl Young; Carl Young 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar David I. Groves; David I. Groves 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Bryan Krapež; Bryan Krapež 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Ian R. Fletcher Ian R. Fletcher 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information A. Kerim Şener 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Carl Young 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia David I. Groves 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Bryan Krapež 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Ian R. Fletcher 1Centre for Global Metallogeny, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia Publisher: Geological Society of America Received: 14 Jul 2004 Revision Received: 18 Nov 2004 Accepted: 26 Nov 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2005) 33 (3): 225–228. https://doi.org/10.1130/G21017.1 Article history Received: 14 Jul 2004 Revision Received: 18 Nov 2004 Accepted: 26 Nov 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation A. Kerim Şener, Carl Young, David I. Groves, Bryan Krapež, Ian R. Fletcher; Major orogenic gold episode associated with Cordilleran-style tectonics related to the assembly of Paleoproterozoic Australia?. Geology 2005;; 33 (3): 225–228. doi: https://doi.org/10.1130/G21017.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract New in situ sensitive high-resolution ion-microprobe (SHRIMP) U-Pb analyses of hydrothermal phosphates associated with orogenic gold mineralization in the Paleoproterozoic Ashburton and Pine Creek gold provinces of northern Australia provide ages of ca. 1740 and ca. 1730 Ma, respectively. Argon-argon analyses of gold-related hydrothermal mica from the Tanami gold province of northern Australia provide ages ca. 1730 Ma. It is important to note that late orogenic events across the western half of Australia coincide with gold metallogenesis across this time interval, in several widely separated provinces. Thus, this orogenic gold episode is interpreted to relate to tectonic events during the amalgamation of various continental blocks to form Paleoproterozoic Australia. It is potentially Earth's best-preserved record of orogenic gold formation during a major early Precambrian continental assembly event. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
The Sindirgi District (Balikesir, western Turkey) lies within the Western Anatolian volcanic and extensional province, adjacent to the WNW-trending Simav graben, approximately 130 km NE of Izmir. The Sindirgi mining district is underlain mainly by Miocene volcanic rocks and hosts several low-sulfidation epithermal Au-Ag deposits and prospects located near the towns of Sindirgi and Bigadic. The Kiziltepe low-sulfidation epithermal gold-silver deposit is located southeast of Yusufcam village (Sindirgi, Balikesir), and other prospects, including the Kepez, Kavakliduz, and Karaduz prospects, are located northeast of Kiziltepe. Potentially economic grades occur at Kiziltepe, which contains a measured and indicated resource of 1.754.790 Mt @3.0 g/t Au, 44 g/t Ag, hosted by quartz veins showing colloform/crustiform banding, quartz pseudomorphs after bladed calcite, and multiphase brecciations, all typical textures noted in low-sulfidation epithermal deposits. Alteration minerals include mixed-layer illite/smectite, high-crystallinity illite, and kandite group minerals (dickite and nacrite). Precious metal minerals include traces of electrum, acanthite, Au-rich acanthite, and Ag-Hg-Au-Tl-Pb series, occurring mainly within quartz. Pyrite is the most common opaque mineral at Kiziltepe. 40Ar/39Ar dating of adularia from the quartz veins indicates an age of mineralization of 18.3 ± 0.2 Ma. The ore mineralization is divided into three main phases. These comprise the deposition of: coarse-grained quartz, illite, pyrite, and minor precious metals (Phase I); major gold–silver-bearing medium-grained quartz, which commonly exhibits crustiform banding, carbonate replacement, and hydrothermal breccia textures (Phase II); and fine-grained chalcedonic quartz with colloform/crustiform banding (Phase III). Phase II is economically the most important in terms of precious metal content. Phase II quartz contains fluid inclusions, which range from predominantly vapor-rich to predominantly liquid-rich with homogenization temperatures (Th) varying from 157 to 330 °C, showing a cluster between 190 and 300 °C, and ice-melting temperatures (Tm) ranging from -0.2 to -2.9 °C (salinity from 0.5-4.8 wt.% NaCl equiv.). Moderate to strong positive correlations occur between Au-Ag (R = 0.8) and Au-Cu (R = 0.5), whereas there is no correlation between As and Au or Ag.
AbstractAbstractRecent research into anomalous gold–platinum-group element (PGE) occurrences (± uranium) in Brazil and Australia has identified an unusual class of epigenetic Au–PGE deposit, previously poorly understood and little documented in the scientific literature. These epigenetic, sediment-hosted deposits display a strong structural control and are hosted entirely or partly within reducing (graphitic or carbonaceous) rocks. Metal transport in these deposits is interpreted to have been in low-temperature (<300°C), saline and acidic fluids as chloride complexes, as deduced from the common metasomatic alteration haloes rich in hematite and sericite. Few, if any, sulphides (pyrite ± chalco-pyrite) are found disseminated within the orebodies and their enveloping host rocks. Within the ore there is a distinct Au>Pd>Pt abundance association, other PGE displaying only minor enrichment (<0.5 ppm). The precious-metal mineralization tends to occur as Au-Pd or Au phases, which contain variable base-metal concentrations, and as more distinct phases of Pd–Pt or Pt. Some ore minerals contain anomalous Se and occur, in places, as complex precious-metal selenide phases. Additionally, Co, Ni, U and LREE, among other trace elements, commonly reach anomalously high concentrations (>20 ppm). These metal associations resemble those of the Fe–oxide Cu–Au deposit group.
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