Petrographical and Geochemical Characteristics of the Kestanelik Granitoid (Çanakkale, Biga Peninsula)

Öz

In this study, the petrographical and geochemical signatures of the Kestanelik Granitoid outcropping near the Şahinli region (Lapseki, Çanakkale) on the Biga Peninsula and associations with Au-Ag mineralization were determined. The Late Ediacaran-Early Cambrian Çamlıca metamorphics form the basement of the study area within the Karabiga massif in the Sakarya Zone. These metamorphics were thrusted tectonically in the Upper Cretaceous Çetmi mélange. The Çamlıca metamorphics are cut by the Eocene Kestanelik Granitoid, and the granodiorite is unconformably overlain by the Soğucak Formation composed of clastic sedimentary rocks. The Şahinli Formation comprises andesite-basalt, fragmented pyroclastics, basalt dykes and lava flows, and mudstone. Quaternary alluvium unconformably covers all units in the area. The Kestanelik Granitoid is an intrusive mass in the form of a stock and contains rocks with granite, quartz monzonite and quartz-rich granitoid composition. The main minerals in these rocks are quartz, K-feldspar, plagioclase, amphibole, hornblende and biotite, and there are secondary minerals such as sericite, illite, chlorite, smectite, kaolinite, dolomite, hematite, cristobalite and alunite. This granitoid has undergone strong alteration and argillic, propylitic and silicification alteration are observed.

The Kestanelik Granitoid generally has shoshonitic, calc-alkaline, subalkaline and metaluminous character, and was derived from an I-type magma. It has high silica content (64.9-75.49%), and major-trace element changes indicate that plagioclase and K-feldspar fractionation were effective in the development of the granitoid. In the granitoid, LILE enrichment is quite high on the REE diagram normalized to the primary mantle. Normalized to chondrite, the granitoid is enriched in light REE and depleted in heavy REE, and also has a negative Eu anomaly (Eu/Eu*=0,87). The Kestanelik Granitoid comprises granites of synchronous age to the volcanic arc and collision, and has magmatic or crustal origin.

Anahtar Kelimeler

• Biga Peninsula
• Kestanelik granitoyid
• petrography
• geochemistry
• origin

Kestanelik Granitoyidinin Petrografik ve Jeokimyasal Özellikleri (Çanakkale, Biga Yarımadası) / Petrographical and Geochemical Characteristics of the Kestanelik Granitoid (Çanakkale, Biga Peninsula)

Öz

Bu çalışmada, Biga Yarımadasında Şahinli köyü (Lapseki, Çanakkale) civarında yüzeyleyen ve Au-Ag cevherleşmesiyle ilişkili olan Eosen yaşlı Kestanelik granitoyidinin petrografik ve jeokimyasal özellikleri ortaya konulmuştur. Sakarya Zonu’nda yeralan Karabiga masifi içerisindeki inceleme alanının temelinde Geç Ediyakaran-Erken Kambriyen yaşlı Çamlıca metamorfikleri bulunmakta ve üzerine tektonik dokanaklı Üst Kretase yaşlı Çetmi melanjı gelmektedir. Çamlıca metamorfitleri, Kestanelik Granitoyidi tarafından kesilmiştir ve bu granitoyidi kırıntılı tortul kayaçları içeren Soğucak formasyonu üzerler. Andezit-bazalt parçacıklı piroklastikler, bazalt daykları ve lav akıntıları ve çamurtaşı içeren Şahinli formasyonu ve Kuvaterner yaşlı alüvyonlar sahadaki tüm birimlerin üzerine uyumsuzlukla gelir. İncelenen Kestanelik granitoyidi stok şekilli intrüzif bir kütledir. Granit, kuvars monzonit ve kuvarsça zengin granitoyid bileşimli kayaçları içerir. Bu kayaçların ana mineralleri kuvars, K-feldispat, plajiyoklas, amfibol, hornblend ve biyotit olup, serisit, illit, klorit, simektit, kaolinit, dolomit, hematit, kristobalit ve alunit ikincil minerallerini kapsar.

Kestanelik granitoyitinde arjilik, piropilitik ve silisleşme alterasyon tipleri gözlenmektedir. Kestanelik granitoyidi genellikle şoşonitik, kalkalkalen, subalkali ve genellikle metalümin karakterlidir ve I-tipi bir magmadan türemiştir. Yüksek silis içeriğine (%64,9-75,49) sahiptir ve ana-iz element değişimleri granitoyidin gelişiminde plajioklas ve K-feldispat fraksiyonlaşmasının etkili olduğunu gösterir. Granitoyidde, ilksel mantoya göre NYE diyagramında LILE zenginleşmesi oldukça fazladır. Kondrite göre normalize edildiğinde, granitoyidin hafif NYE bakımından zenginleştiği ve ağır NYE bakımından da fakirleştiği belirlenmiştir ve aynı zamanda negatif Eu anomalisine (Eu/Eu*=0,87) de sahiptir. Kestanelik granitoyidleri, volkanik yay (VAG) ve çarpışma ile eş yaşlı (syn-COLG) granitlerdir ve magmatik veya kabuk kökenlidir.

Anahtar Kelimeler

• Biga Yarımadası
• Kestanelik granitoyid
• petrografi
• jeokimya
• köken

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