Zircon growth in a granitic pluton with specific mechanisms, crystallization temperatures and U-Pb ages : Quantitative determination of Ti concentration in zircon by EPMA
Bibliographic Information
- Other Title
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- 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
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Description
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
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- 名古屋大学年代測定研究
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名古屋大学年代測定研究 1 55-62, 2017-03-31
名古屋大学宇宙地球環境研究所年代測定研究部
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Details 詳細情報について
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- CRID
- 1390009224547319296
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- NII Article ID
- 120006498111
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- HANDLE
- 2237/00028470
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- NDL BIB ID
- 031441670
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- Abstract License Flag
- Allowed