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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Thermochronology of hydrothermal alteration zones in the Kii Peninsula, southwest Japan: an attempt for detecting the thermal anomalies and implications to the regional exhumation history

Fig. 3

Schematic plots showing basic concepts of sampling and analytical strategies. (1) Fluid temperatures are estimated from the alteration zones using geothermometers. (2) The timings of fluid activity can be equivalent to the cooling ages of the host rocks nearest to the alteration zones if the ages are totally reset by heating. (3) The spatial pattern of the thermal effects of fluid activity is constrained by thermochronometric data obtained from host rocks at various distances from the alteration zones. Regional cooling and exhumation histories are reconstructed from the undisturbed host rocks at a certain distance from the alteration zones. (4) The duration of fluid activity can be constrained by comparing thermochronometric data from the host rocks nearest to the alteration zones. If a thermochronometric system is totally reset and another is not, the heating duration can be constrained by the kinetics of those systems and the temperatures estimated in (1). Plots denote fractional-loss contours of ZFT, ZHe, AFT, and AHe systems constructed after Yamada et al. (2007) and Reiners (2009), respectively. [f, fractional loss; FL, Fanning linear model; r, reduced fission-track lengths]

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