Zircon growth in a granitic pluton with specific mechanisms, crystallization temperatures and U-Pb ages : Quantitative determination of Ti concentration in zircon by EPMA

DOI IR HANDLE Web Site Open Access

Bibliographic Information

Other Title
  • Ti濃度定量による結晶化温度とU-Pb年代から導く花崗岩中のジルコンの形成プロセス : EPMAによるジルコン中のチタン濃度の定量

Search this article

Abstract

Zircon crystals of the Toki granitic pluton provide evidence of serial growth events with specific mechanisms, crystallization temperatures, and U-Pb ages. With this evidence we can deduce details of the sequential formation process from intrusion through emplacement to crystallization/solidification. Serial growth events have been identified by: 1) a study of the internal structure of zircon using cathodoluminescence observation, 2) crystallization temperatures using Ti-in-zircon thermometry of the internal structure, and 3) UPb age dating of the internal structure. This paper expounds a procedure for quantitatively determining the titanium concentration in zircon and the results of crystallization temperature measurements based on a Ti-in-zircon thermometer. The magmatic zircons collected from Toki granite display two different internal structures: LLC (low luminescence core) and OZ (oscillatory zonation). The LLC crystallized due to interfacial reaction-controlled growth with the cooling granitic magma under temperature conditions ranging from about 910℃ to about 760℃. The OZ developed due to diffusion-controlled growth within a cooling magma chamber under temperature conditions from about 850℃ to about 690℃.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top