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Structural Controls on Porphyry Au-Cu and Au-Rich Polymetallic Carbonate-Hosted Replacement Deposits of the Kassandra Mining District, Northern Greece

2018; Volume: 113; Issue: 2 Linguagem: Inglês

10.5382/econgeo.2018.4552

1554-0774

Chris R. Siron, D Rhys, John F. Thompson, Tim Baker, Theodore Veligrakis, Alfredo Camacho, Lazaros Dalampiras,

Geological and Geophysical Studies Worldwide

Research Article| March 01, 2018 Structural Controls on Porphyry Au-Cu and Au-Rich Polymetallic Carbonate-Hosted Replacement Deposits of the Kassandra Mining District, Northern Greece Chris R. Siron; Chris R. Siron 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853 †Corresponding author: email, crs344@cornell.edu Search for other works by this author on: GSW Google Scholar David Rhys; David Rhys 2Panterra Geoservices Inc., 14180 Greencrest Dr., Surrey, British Columbia V4P 1L9, Canada Search for other works by this author on: GSW Google Scholar John F.H. Thompson; John F.H. Thompson 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Tim Baker; Tim Baker 3Eldorado Gold Corporation, 1188 Bentall 5, 550 Burrard St., Vancouver, British Columbia V6C 2B5, Canada Search for other works by this author on: GSW Google Scholar Theodore Veligrakis; Theodore Veligrakis 4Eldorado Gold Exploration, 23a Vassilissis Sofias Ave. 106 74, Athens, Greece Search for other works by this author on: GSW Google Scholar Alfredo Camacho; Alfredo Camacho 5Department of Geological Sciences, University of Manitoba, 240 Wallace Building, 125 Dysart Road, Winnipeg R3T 2N2, Manitoba, Canada Search for other works by this author on: GSW Google Scholar Lazaros Dalampiras Lazaros Dalampiras 4Eldorado Gold Exploration, 23a Vassilissis Sofias Ave. 106 74, Athens, Greece Search for other works by this author on: GSW Google Scholar Author and Article Information Chris R. Siron 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853 David Rhys 2Panterra Geoservices Inc., 14180 Greencrest Dr., Surrey, British Columbia V4P 1L9, Canada John F.H. Thompson 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853 Tim Baker 3Eldorado Gold Corporation, 1188 Bentall 5, 550 Burrard St., Vancouver, British Columbia V6C 2B5, Canada Theodore Veligrakis 4Eldorado Gold Exploration, 23a Vassilissis Sofias Ave. 106 74, Athens, Greece Alfredo Camacho 5Department of Geological Sciences, University of Manitoba, 240 Wallace Building, 125 Dysart Road, Winnipeg R3T 2N2, Manitoba, Canada Lazaros Dalampiras 4Eldorado Gold Exploration, 23a Vassilissis Sofias Ave. 106 74, Athens, Greece †Corresponding author: email, crs344@cornell.edu Publisher: Society of Economic Geologists Accepted: 06 Nov 2017 First Online: 09 Mar 2018 Online Issn: 1554-0774 Print Issn: 0361-0128 © 2018 Economic GeologyEconomic Geology Economic Geology (2018) 113 (2): 309–345. https://doi.org/10.5382/econgeo.2018.4552 Article history Accepted: 06 Nov 2017 First Online: 09 Mar 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chris R. Siron, David Rhys, John F.H. Thompson, Tim Baker, Theodore Veligrakis, Alfredo Camacho, Lazaros Dalampiras; Structural Controls on Porphyry Au-Cu and Au-Rich Polymetallic Carbonate-Hosted Replacement Deposits of the Kassandra Mining District, Northern Greece. Economic Geology 2018;; 113 (2): 309–345. doi: https://doi.org/10.5382/econgeo.2018.4552 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 SocietyEconomic Geology Search Advanced Search Abstract The Kassandra mining district of northern Greece contains about 12 Moz Au in porphyry Au-Cu and Au-Ag-Pb-Zn-Cu carbonate replacement deposits that are associated with Oligocene-Miocene intrusions emplaced into polydeformed metamorphic basement rocks belonging to the Permo-Carboniferous to Late Jurassic Kerdilion unit and the Ordovician-Silurian Vertiskos unit. Regional extensional tectonics active since the middle Eocene resulted in the development of widespread normal and transtensional faults, including the Stratoni fault zone that hosts carbonate replacement sulfide orebodies. This structure has been previously interpreted as the tectonic boundary between the Kerdilion and Vertiskos units. Geologic relationships, structural patterns, immobile element geochemistry, and published zircon U-Pb ages suggest that the tectonic boundary between these lithotectonic units is an older structure and not a detachment fault as previously indicated.Carbonate-hosted replacement orebodies at the Olympias, Madem Lakkos, and Mavres Petres deposits are controlled by the Kassandra fault and Stratoni fault zones. Orebody location and morphology is influenced by a preexisting ductile structural architecture and the interaction of ductile to brittle faults with marble host rocks. Intersection of ductile fabrics and folds with extensional mylonites and synmineral semibrittle shear zones form a linear plunging domain that controls sulfide ore at the Olympias deposit. The Madem Lakkos sulfide orebodies are hosted by marbles located within fold hinges and intersecting semibrittle faults, whereas the Mavres Petres orebody is controlled by lenses of marble entrained within the Stratoni fault zone. Hydrothermal mica 40Ar/39Ar ages indicate that sulfide ore deposition occurred between 24.0 ± 0.6 and 22.6 ± 0.3 Ma, overlapping with late Oligocene magmatism in the district. Kinematic fault-slip data and field relationships suggest that carbonate replacement mineralization within the Stratoni fault zone was initiated toward the end of north-south extension during the late Oligocene, whereas younger Au-bearing quartz-rhodochrosite vein breccias that are spatially related to but crosscut sulfide ores were controlled largely by east-west extension.The Skouries Au-Cu deposit is hosted by an early Miocene quartz monzonite porphyry stock that postdates the folding of gneiss and schist of the Vertiskos unit. Mineralized veins within the stock and porphyry dikes predominately strike northeast, consistent with the orientation of the Oligo-Miocene igneous belt. Ascent of fertile magmas into the upper crust may have been triggered by a change in the extension direction during the early Miocene. Magmatism during the late Oligocene and early Miocene corresponds to distinct extensional episodes that facilitated polymetallic carbonate replacement and porphyry Au-Cu ore formation within an evolving post-collisional tectonic setting. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.