英和和英

名詞

closure temperature (複数形 closure temperatures)

1. (geology) The temperature, of a mineral, etc., below which there is no significant diffusion of isotopes into the external environment; the temperature of said mineral at the time it was formed (as calculated by radiometric dating).

   Synonym: blocking temperature

   • 1990, C. M. R. Fowler, The Solid Earth, Cambridge University Press, page 199,

     The relationship between the closure temperature of a mineral and its cooling history can be put onto a more rigorous footing by the use of some thermodynamics.

   • 2006, Jean Braun, Peter van der Beek, Geoffrey Batt, Quantitative Thermochronology, Cambridge University Press, page 23,

     Dodson (1973) introduced the term closure temperature, which he defined as the temperature of the thermochronological system at the time ${\displaystyle t_{c}}$ corresponding to its apparent age (cf. Figure 2.1). The closure temperature, which by definition lies between the open-system and blocking temperatures, provides the simplest conceptual entity to which a thermochronological age can be related.

   • 2020, Barbara A. Romanowicz, Seismic Tomography of the Earth's Mantle, David Alderton, Scott A. Elias (editors-in-chief), Encyclopedia of Geology, Volume 1, 2nd Edition, Academic Press, page 606,

     As the closure temperature varies for every mineral and isotopic system, a system can be closed for one mineral at some temperature but open for another.