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Petrochemistry of Bang Tha Cham granitoid, Chonburi Province, Central Granite Belt, Thailand

Sarawut Buranrom^a, Ladda Tangwattananukul^a,*, Dussadee Rattanaphra^b, Wilasinee Kingkam^b, Sasikarn Nuchdang^b

 
ABSTRACT:      Triassic granitoid is exposed in the Bang Tha Cham area of Chonburi Province, Eastern Thailand, along the NW-SE trending Klaeng fault zone located between the Central Granite Belt and Eastern Granite Belt. The geology in the Bang Tha Cham area mainly comprises Carboniferous sandstone and Triassic granite. Twenty representative samples were collected and classified into three groups; based on mineral compositions, petrography, and geochemistry; as Group I quartz monzonite, Group II quartz syenite, and Group III granite. Whole-rock geochemistry of Groups I to III were plotted showing the granite to granodiorite compositions (Group III) and granite to granodiorite compositions (Groups I and II) for SiO2 against Na2O+K2O of S-type granite, shown in the diagram of Al/(Ca+Na+K) versus Al/(Na+K). These granites originated from a high-K calc-alkaline to a shoshonitic series derived from an upper crustal source. Tectonic discrimination diagrams suggested that these granites were formed during the within-plate Triassic event. Crystallization pressure-temperature (P-T) conditions of the granites were 3.0 to 3.2 kbar and 723 to 732 ?C. The granitoid was moderately metamorphosed and recrystallized during the Klaeng tectonic era, with estimated crystallization P-T conditions of 10.4 to 10.9 kbar and 300 to 483 ?C. Granites in the Bang Tha Cham area of Chonburi Province are classified as S-type granites belonging to the Central Granite Belt which intruded both syn-collisional and post-collisional after the closure of the Paleothethyan in the Triassic.

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* Corresponding author, E-mail: fscildt@ku.ac.th

Received 10 Feb 2023, Accepted 25 Oct 2023