This review of the granites of Thailand is based on the work by Cobbing et al. (1986, 1992), Charusiri et al. (1993) and subsequent studies (Charusiri et al. 2002; Putthapiban 2002). The term granite is used throughout in its broad sense meaning a felsic plutonic rock, and covers compositional varieties including adamellites, tonalities and granodiorites among others, as well as granites sensu stricto. Recognition of the different Granite Provinces and the tectonic divisions in Thailand was facilitated by the description of similar belts of granites and tectonic divisions in SE Asia by Mitchell (1977) and along-strike to the south in Peninsular Malaysia by Hutchison (1977). Each Granite Province is characterized by distinctive batholiths, plutons, stocks, pegmatites and units repre senting different granite types and ages of emplacement. The nomenclature of the Granite Provinces in SE Asia present in Thai land is based on that of Hutchison (2007); the granites of Thailand (Fig. 16.1) are distributed in three Granite Provinces comprising a Western, Eastern and a Central Province that form approximately linear north-south belts.
The Western Province is of largely Cretaceous age but extend ing locally to the Palaeocene. The Eastern and Central Provinces, on the other hand, are of Triassic age.
The Western Province occupies Upper Peninsular Thailand passing west into Myanmar, and to the south it reappears across the Malacca Straits in Sumatra. The Eastern Province runs from western and north-western
Figures & Tables
The Geology of Thailand
This is the first volume in the English language to cover the entire range of the geology of Thailand since the joint Thai—US account by Brown et al. exactly 60 years ago. Over this period there has been a phenomenal growth in interest in this core area of SE Asia. This has been led by geologists in Thailand, but with important and highly significant input from geologists based elsewhere in Asia and in Europe, Australasia and North America. Some of that research was prompted by commercial considerations, since Thailand has important energy and mineral resources, while other research has sought to understand better the stratigraphic and structural history, including the plate-tectonic story which Thailand's rocks reveal. This new volume seeks to bring together all of this knowledge into a single accessible book; it is the work of an international team drawn from Thailand, Japan, Australia, USA, Canada, Germany and the UK.