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Lahanos |
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Turkiye / Turkey |
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Cu Zn Ag Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Lahanos copper deposit is located approximately 160 km and 240 km to the west of the Madenkoy and Murgul VHMS deposit clusters respectively on the Black Sea coast of Turkey, 85 km WSW of Trabzon (#Location: 40° 50' 28"N, 38° 41' 31"E).
Lahanos lies within the 350 x 60 km, east-west oriented, Jurassic to Miocene East Pontic Metallotect, which includes the Madenkoy-Murgul string of volcanic hosted massive sulphide (VMS) deposits that are distributed along the Black Sea coast of eastern Turkey. It is hosted within a 150 to 300 m thick sequence of strongly altered Senonian age pyroclastic rocks in the first volcanic cycle of an Upper Cretaceous island arc volcano-sedimentary sequence. Murgul and Madenkoy are associated with this same unit.
The East Pontic Metallotect consists of an approximately 3000 m thick volcanic sequence with thick intercalations of marine sediments, which thin drastically to the east towards Madenkoy and Murgul where they are only present as sparsely and locally developed interbeds. The extrusive series has been divided into three cycles, namely:
i). a first cycle Jurassic to Upper Cretaceous volcanic pile, represented by initial basaltic (spilitic) activity which changes progressively to felsic lava flows in the middle and top level;
ii). transgressive volcanic breccias, tuffs, and marine sediments of limited thickness marking the beginning of the second cycle, overlain by andesitic and rhyolitic lava flows and then by limestones of Maastrichtian age.
iii). a late cycle commencing with a sequence of marine sediments of Paleocene age which are overlain by andesitic and minor basaltic lava flows constituting Tertiary volcanic activity.
The hydrothermal mineralisation process comprise:
• an early distal phase of phyllic (quartz-sericite) and argillic zones which accompany the first stage of extensive, but weak (0.2 to 0.8% Cu) disseminated pyrite-chalcopyrite mineralisation and
• a late stage of silicification which corresponds to the second (1 to 3% Cu) and third (5 to 10% Cu) mineral phases, mainly pyrite and chalcopyrite as stockworks, veinlets and small lodes which represent the main economic ores, accompanied by lesser local accumulations of sphalerite, galena, tetrahedrite and bornite. Gold is also locally enriched in the second cycle. The third mineral phase mainly occurs as short sulphide veins.
The distribution of alteration and mineralisation defines a concentric pattern, with the higher grades predominantly concentrated in the centre and are interpretted to have formed close to the surface in a marine environment.
Lahanos contained 8 Mt of ore with an average grade of 1.6% Cu, 2.3% Zn. In 2005 the remaining reserve comprised >2.3 Mt @ 3.6% Cu, 2.4% Zn plus gold/silver.
The most recent source geological information used to prepare this decription was dated: 2005.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
Lahanos
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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