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K-Ar geochronology for hydrothermal K-feldspar within plagioclase in a granitic pluton; Constraints on timing and thermal condition for hydrothermal alteration

Yuguchi, Takashi*; Yagi, Koshi*; Sasao, Eiji  ; Nishiyama, Tadao*

Our methodology and interpretations provide new insight for K-Ar geochronology in hydrothermal microcline within altered plagioclase in a granitic pluton. Our methodology employs a two-step separation process consisting of (1) plagioclase extraction from the rock sample and (2) separation of the hydrothermal microcline from the plagioclase, giving precise determination of microcline powders in K-Ar geochronology. This tighter constraint should provide the ability to better unravel thermal and age histories in granite subject to multi-step alteration processes and complex thermal histories.

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Category:Multidisciplinary Sciences

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