Kestanelik Granitoyidinin Petrografik ve Jeokimyasal Özellikleri (Çanakkale, Biga Yarımadası).

Kıray, Didem; Cengiz, Oya

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.

BIGA Peninsula (Turkey); PETROLOGY; GEOCHEMISTRY; METAMORPHIC rocks; CRETACEOUS Period

Mathematical Reports, 2023, Vol 25, Issue 1, p127

1582-3067

Academic Journal

10.25288/tjb.1187739