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The Tak Batholith is located in the western part of Thailand’s eastern granitoid belt. To better understand the geochemical characteristics of granitoid and identify their occurrence, rock samples collected from the eastern part of the Tak Batholith were used for petrographical, mineralogical, and geochemical analyses. According to field investigation and lithology, petrography classifies these granitic rocks as medium-grained granodiorite and granodioritic dike. The granodiorites are composed chiefly of plagioclase, orthoclase, quartz, hornblende, and biotite, with tiny amounts of zircon, apatite, and opaque minerals. Meanwhile, the granitic dike shows a highly porphyritic texture, presenting mostly plagioclase phenocrysts, with a small amount of orthoclase and unidentified mafic phenocrysts sitting in a fine-grained groundmass comprising K-feldspar and quartz with a small amount of plagioclase and present granophyric intergrowth. Geochemical data of the amphiboles classified them as Ferro-edenite symbolizing the I-type granite. Whole-rock geochemistry indicates that these rock suites are I-type metaluminous granodiorite, and diorite fractionated from the high K calc-alkaline magma melted from the mafic crust of arc magmatism agreeable with the enrichment of large ion lithophile elements and depletion of highfield-strength elements, and rare earth element patterns.

Thermal diffusivity is an important physical parameter for assessing thermal damage to granite. In this paper, hornblende granite and alkaline granite were subjected to cooling and heating cycles at different temperatures. The quenching cycles of hornblende granite are 1, 5, 10, 15 and 20 times between 250 °C and 650 °C. The quenching cycle of the alkaline granite is 1, 5, 10 and 15 times in the range of 250 °C–450 °C, respectively. The thermal diffusivity of the two types of granite was measured. The experimental results show that the thermal diffusivity of amphibole granite and alkaline granite decreases with the increase of the number of cycles at a given heat treatment temperature. When the number of cycles is constant, the thermal diffusivity decreases as the temperature increases. • We conducted different quenching experiments of granite up to 15 cycles and 650 °C. • As the temperature and number of cycles increases, the thermal diffusivity decreases. • Quartz and feldspar are used to evaluate the thermal diffusivity change of granite. [ABSTRACT FROM AUTHOR]