GSA Annual Meeting in Denver, Colorado, USA - 2016

Paper No. 206-11
Presentation Time: 3:30 PM


AGUILERA, Kimberly N.1, CATLOS, Elizabeth J.2, OYMAN, Tolga3, MILLER, Nathan R.4 and ETZEL, Thomas M.2, (1)Department of Geological Sciences, The Unversity of Texas at Austin, 23rd st., Austin, TX 78759, (2)The Jackson School of Geosciences, The Unversity of Texas at Austin, 2275 Speedway Stop C9000, Austin, TX 78712, (3)Department of Geology, Dokuz Eylul University, Cumhuriyet Bulvari No: 144, Izmir, 35210, Turkey, (4)Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78712,

The Nemazgah pluton, located in the Biga Peninsula of western Turkey, is a Miocene in age tourmaline bearing leucocratic porphyry formed in response to either subduction migration along the Hellenic arc or wide spread extension due to the closure of the Vardar Ocean. Zoned tourmalines appear in acicular clusters and as larger columnar crystals with precipitated zircons in quartz rich veins. Zircon grains also appear hydrothermal with morphologies suggesting precipitation from a fluid phase. This study is aimed at providing a better understanding of timing the hydrothermal activity and physio-chemical conditions under which it occurred. Five rock samples were collected from an aplite from the Nemazgah pluton to analyze the textural properties of the host rock, zircon, and tourmaline. Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) was used to determine minor and trace element concentrations to characterize the fluid and previous host rock composition. Zircon grains were dated using Secondary Ion Mass Spectrometry (SIMS). Ages of Nemazagh zircons are Miocene, and preliminary trace element data from LA-ICP-MS exhibits LREE enrichment of tens of µg/g and element partitioning of Sn and V in the c-sector between core to rim zonation patterns.