Stream Sediment Geochemical Exploration for Gold in the Kazdağ Dome in the Biga Peninsula, Western Turkey

The Tuztaşı Au-Ag mineralized system was discovered within the Kazdağ dome using BLEG (bulk leach extractable gold) and 180-µm stream sediment geochemical data collected across the Biga Peninsula in western Turkey. The deposit is located within the hinge of an antiform consisting mainly of high-grade metamorphic and mélange rocks that include the Altınoluk Pb-Zn-Cu-Ag-Au and Evciler Fe-Au-Cu deposits on the southern and on the northern flanks, respectively; no mineralization has been reported prior to this work which was first carried out in 1996 between Altınoluk and Evciler. The BLEG Ag/Au ratios at Tuztaşı (max 87) and Altınoluk (max 43) are very high to extremely high demonstrating the area to be relatively Ag-rich. This Ag enrichment is further demonstrated by rock chip Ag/Au ratios reaching up to 43 at the Tuztaşı deposit. Silver is a moderate to very effective pathfinder for Au at Tuztaşı. Arsenic is useful, being more mobile than Sb. Arsenic also constitutes the most coherent and the most significant geochemical anomaly in the northern half of the AYALE (Ayvacık-Altınova-Evciler) area which is underlain mainly by the mélange rocks intruded by granitoid. The BLEG sampling accompanied by further follow-up 180-µm stream-sediment sampling is a powerful technique in detecting Au-Ag deposits or occurrences. BLEG appears to be a time- and cost-efficient stream sediment geochemical technique for discovering relatively large primary geochemical halos encompassing the precious (Au, Ag) and base metal (Cu, Pb, Zn) deposits.

Anahtar Kelimeler:

BLEG sampling, geochemistry, gold, mineral exploration, Kazdağ, western Turkey

Stream Sediment Geochemical Exploration for Gold in the Kazdağ Dome in the Biga Peninsula, Western Turkey

Keywords:

BLEG sampling, geochemistry, gold, mineral exploration, Kazdağ, western Turkey,

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ALDANMAZ, E. 2006. Mineral-chemical constraints on the Miocene calc- alkaline and shoshonitic volcanic rocks of western Turkey: disequilibrium phenocryst assemblages as indicators of magma storage and mixing conditions. Turkish Journal of Earth Sciences 15, 47–73.
AYDAL, D., VURAL, A. & POLAT, O. 2004. Definition the base metal- and gold-bearing hydrothermally-altered areas in volcanic rocks using Landsat 7 Tm imagery: case study from Bayramiç (Çanakkale). 57thGeological Congress of Turkey, Ankara, Abstracts, p. 90.
BECCALETTO, L. & JENNY, C. 2004. Geology and correlation of the Ezine Zone: A Rhodope fragment in NW Turkey. Turkish Journal of Earth Sciences 13, 145–176.
BECCALETTO, L. & STENERC. 2005. Evidences of two-stage extensional tectonics from the northern edge of the Edremit Graben, NW Turkey. Geodinamica Acta 18/3, 225–239.
BEESON, R. 1995. A drainage sediment geochemical orientation study at Boddington, Western Australia. Journal of Geochemical Exploration 54, 63–71.
BERGER, B.G. & BETHKE, P.M. 1984. Geology and geochemistry of epithermal systems. Reviews in Economic Geology 2, 169–202.
BEUS, A.A. & GRIGORIAN, S.V. 1977. Geochemical Exploration Methods for Mineral Deposits. Applied Publishing Ltd., Illinois, USA.
BİNGÖL, E. 1969. Geology of the central and southeastern parts of the Kazdağ Massif.
Maden Tetkik ve Arama (MTA) Dergisi 72,
–23 [in Turkish with English abstract].
BOSE, P. & SHARMA, A. 2002. Role of iron in controlling speciation and mobilization of arsenic in subsurface environment. Water Researches 36, 4916–4926.
BOYLE, R.W. 1979. The geochemistry of gold and its deposits. Bulletin Geological Survey Canada 280, 1–584.
COHEN, D.R., DUNLOP, A.C. & ROSE, T. 2005. Contrasting dispersion patterns for gold in stream sediments in Timbarra, NSW, Australia. Journal of Geochemical Exploration 85, 1–16.
CRAW, D. 2001. Tectonic controls on gold deposits and their environmental impact, New Zealand. Journal of Geochemical Exploration 73, 43–56.
DAVIS, J.C. 1986. Statistics and Data Analysis in Geology. John Willey & Sons, New York, USA.
DELALOYE, M. & BİNGÖL, E. 2000. Granitoids from western and northern Anatolia: Geochemistry and modeling of geodynamic evolution. International Geological Review 42, 241–268.
DURU, M., PEHLİVAN, fi., fiENTÜRK, Y., YAVAfl, F. & KAR, H. 2004. New results on the lithostratigraphy of the Kazdağ Massif in Northwest Turkey. Turkish Journal of Earth Sciences 13, 177–186.
ELIOT, S.M. & TOWSY, C.A. 1989. Regional Drainage Geochemical Exploration Techniques Used in Queensland, Australia. North Queensland Gold ’89 Conference, Townsville, Australia, IMM Publication, 51–61.
ERCAN, T., TÜRKECAN, A., AKYÜREK, B., GÜNAY, E., CEVİKBAfl, A., ATEfl, M., CAN, B., ERKAN, M. & ÖZKİRİflÇİ, E. 1984. The geology of Dikili- Bergama-Çandarlı area (Western Anatolia) and petrology of the magmatic rocks. Jeoloji Mühendisliği Dergisi 20, 47–60 [in Turkish with English abstract].
ERCAN, T., SATIR, M., STEINITZ, G., DORA, A., SARIFAKO⁄LU, E., ADIS, C., WALTER, H.J., YILDIRIM, T. 1995. Biga yarımadası ile Gökçeada, Bozcaada ve Tavflan adalarındaki (KB Anadolu) Tersiyer volkanizmasının özellikleri [The characteristics of Tertiary volcanism in Biga Peninsula, Gökçeada, Bozcaada and Tavflan islands (NW Anatolia)]. Maden Tetkik ve Arama (MTA) Dergisi 117, 55–86 [in Turkish with English abstract].
ERKÜL, F., HELVACI, C. & SÖZBİLİR, H. 2005. Stratigraphy and geochronology of the Early Miocene volcanic units in the Bigadiç borate basin, western Turkey. Turkish Journal of Earth Sciences 14, 227–253.
GENÇ, fi.C. 1998. Evolution of the Bayramiç magmatic complex, northwestern Anatolia. Journal of Volcanology and Geothermal Research 85, 233–49.
KILIÇ, M., KÜÇÜKEFE, fi., AVflAR, M., SARI, R., VURAL, A. & PEHLİVAN, N. 2004. Preliminary geological and geochemical data on Kısacık (Ayvacık-Çanakkale) Au mineralization. 57thGeological Congress of Turkey, Ankara, Abstracts, p. 101.
LEVINSON, A.A. 1974. Introduction to Exploration Geochemistry. Applied Publishing Ltd., Wilmette, IL.
MAZZUCCHELLI, R.H. 1990. Advanced Exploration Geochemistry. Workshop course 704/90, Australian Mineral Foundation, Publication 550.84, Australia.
MAZZUCCHELLI, R.H. 1994. Drainage geochemistry in gold exploration. In: HALE, M. & PLANT, J.A. (eds), Drainage Geochemistry, Handbook of Exploration Geochemistry 6. Elsevier, Amsterdam, 379–414.
MEIER, A.L. 1980. Flameless atomic-absorbtion determination of gold in geological materials. Journal of Geohemical Exploration 13, 77–85.
MTA (Maden Tetkik ve Arama Enstitüsü) 1966. Copper, Lead and Zinc Deposits of Turkey. MTA Publications 133, Ankara.
MTA (Maden Tetkik ve Arama Enstitüsü) 1993. Lead and Zinc Deposits of Turkey. MTA Publications 199, Ankara.
NICHOLS, I., HALE, M. & FLETCHER, W.K. 1994. Drainage geochemistry in gold exploration. In: HALE, M. & PLANT, J.A. (eds), Drainage Geochemistry, Handbook of Exploration Geochemistry 6. Elsevier, Amsterdam, 499–557.
OKAY, A.İ, SİYAKO, M. & BÜRKAN, K.A. 1991. Geology and tectonic evolution of the Biga Peninsula, northwest Turkey. Bulletin of the Technical University of İstanbul 44, 191–256.
OKAY, A.İ., SATIR, M., MALUSKI, H., SİYAKO, M., MONIE, P., METZGER, R. & AKYÜZ, S. 1996. Paleo- and Neo-Tethyan events in northwest Turkey: geological and geochronological constraints. In: YIN, A. & HARRISON, M. (eds), Tectonics of Asia. Cambridge University Press, 420–441.
OKAY, A.İ. & SATIR, M. 2000. Coeval plutonism and metamorphism in a latest Oligocene metamorphic core complex in northwest Turkey. Geological Magazine 137, 495–516.
ÖNGEN, S. 1978. Petrographie und Petrochemie des Çavuslu-Karaköy Granitoid Massivs,
İstanbul Üniversitesi FenFakültesi Mecmuası B43, 93–115.
ÖNGEN, S. 1994. Le pluton calco-alcalin d’Evciler (peninsula de Biga,
Turquie-NW): age, geochemie et signification geodynamique. Comptes Rendus de l’Académie des Sciences, Paris 319, 1033–1039.
OTTESEN, R.T. & THEOBALD, P.K. 1994. Stream sediments in mineral exploration. In: HALE, M. & PLANT, J.A. (eds), Drainage Geochemistry, Handbook of Exploration Geochemistry 6. Elsevier, Amsterdam, 147–184.
PIRAJNO, F. 1992. Hyhdrothermal Mineral Deposits. Springer-Verlag. New York, Berlin Heidelberg.
RADFORD, N. 1996. BLEG sampling in gold exploration: an Australian View. Explore 92, 8–10.
ROSE, A.W., HAWKS, H.E. & WEBB, J.H. 1979. Geochemistry in Mineral Exploration. Academic Press, NY, USA.
SCHUILING, R.D. 1959. Über eine prä-herzynische Faltungsphase im Kazdağ Kristallin. Maden Tetkik ve Arama (MTA) Dergisi 53, 89–93.
TAYLOR, S.R. 1966. The application of trace element data to problems in petrology. Physics and Chemistry Earth 6, 133–213.
THOMPSON, M. & HOWARTH, R.J. 1978. A new approach to the estimation of analytical precision. Journal of Geochemical Exploration 9, 23–30.
TOKÇAER, M., AGOSTINI, S. & SAVAflÇIN, M.Y. 2005. Geotectonic setting and origin of the youngest Kula volcanics (western Anatolia), with a new emplacement model. Turkish Journal of Earth Sciences 14, 143–166.
XUEQIU, W., XUEJING, X., ZHIZHONG, C. & DAWEN, L. 1999. Delineation of regional geochemical anomalies penetrating through thick cover in concealed terrains – a case history from the Olympic Dam deposit, Australia. Journal of Geochemical Exploration 66, 85–97.
WILHELM, E. & ARTIGNAN, D. 1994. Drainage geochemistry in gold exploration. In: HALE, M. & PLANT, J.A. (eds), Drainage Geochemistry, Handbook of Exploration Geochemistry 6. Elsevier, Amsterdam, 415–444.
WOOD, D.G., PORTER, R.G. & WHITE, N.C. 1990. Geological features of some Paleozoic epithermal gold occurrences in northeastern Queensland, Australia. Journal of Geochemical Exploration 36, 413–443.
YANG, S.X. & BLUM, N. 1999. A fossil hydrothermal system or a source bed in the Madiyi Formation near the Xiangxi Au-Sb-W deposit, NW Hunan, PR of China. Chemical Geology 155, 151–169.
YILMAZ, H. 2003. Geochemical exploration for gold in western Turkey: success and failure. Journal of Geochemical Exploration 80, 117–135.
YILMAZ, H. & KARA, Z. 1996. Kazdağ Project. Eurogold, Turkey Company Report, 1–20 [unpublished].
YÜCEL-ÖZTÜRK, Y., HELVACI, C. & SATIR, M. 2005. Genetic relations between skarn mineralization and petrogenesis of the Evciler granitoid, Kazdağ, Çanakkale, Turkey and comparison with world skarn granitoids. Turkish Journal of Earth Sciences 14, 255–280.