Stream sediment geochemical exploration for gold in the Kazdağ dome in th Biga Peninsula, Western Turkey

Tuztaşı mineralizasyon sistemi Biga Yarımadasında Kazdağ domunda (Batı Anadolu) BLEG (altının hacimsel ayrıştırılması) ve 180-$mu m$ dere tortulu jeokimyasal verilerini kullanarak keşfedilmiştir. Yatak çoğunlukla yüksek dereceli metamorfik ve melanj kayalarından oluşan bir antiform sırtında yer alır ve sırasıyla bu antiform güney ve kuzey kanatlarındaki Altınoluk Pb-Zn-Cu-Ag-Au ve Evciler Fe-Au-Cu yataklarını da kapsar; fakat ilk olarak 1966 da yapılan bu çalışma öncesinde literatürde Altınoluk ve Evciler arasındaki bir cevherleşmenin (Tuztaşı cevherleşmesi) varlığından söz edilmemiştir. Tuztaşındaki BLEG Ag/Au (maksiumum 87) ve Altınoluk (maksiumum 43) oranlarının oldukça yüksek oluşu sahanın göreceli Ag-zengini olduğuna işaret eder. Bu Ag zenginleşmesi 43'e kadar ulaşan kayaç Ag/Au oranlarıyla da gösterilir. Gümüş Tuztaşındaki Au'ın aranmasında oldukça etkin bir iz bulucudur. Antimondan daha hareketli olan As altın aramasında keza yararlıdır. Arsenik granotoid sokulumlu melanj kayalarınca altlanan çalışma alanının kuzey yarısındaki en tutarlı ve en önemli jeokimyasal anomaliyi oluşturur. BLEG örneklemesini takiben yapılan180-$mu m$ dere sedimanı Au-Ag yatak ve zuhurlarının bulunmasında güçlü bir tekniktir. BLEG, kıymetli (Au-Ag) ve baz metal (Cu, Pb, Zn) yataklarını çevreleyen göreceli büyük ilksel jeokimyasal halelerin aranmasında zaman ve maliyet açısından etkin bir dere tortulu jeokimyası tekniği olarak gözükür.

Biga Yarımadası Kazdağ domundaki (Batı Anadolu) Dere sedimanı jeokimyasal altın aramaları

The Tuztaşı Au-Ag mineralized system was discovered within the Kazdağ dome using BLEG (bulk leach extractable gold) and 180-$mu m$ 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 melange 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 melange rocks intruded by granitoid. The BLEG sampling accompanied by further follow-up 180-$mu m$ 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.

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