Triassic carbonate rocks in the Phatthalung area, Peninsular Thailand
Carbonate rocks in the Phatthalung area and others in Peninsular Thailand have been known as the Permian Rat Buri Limestone. The study area is characterized by several isolated limestone mountains and is located in Phatthalung province. Micropaleontological study of these carbonate rocks indicate...
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| Format: | Article |
| Language: | English |
| Published: |
ScienceDirect
2016
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| Subjects: | |
| Online Access: | http://kb.psu.ac.th/psukb/handle/2016/14981 |
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| Institution: | Prince of Songkhla University |
| Language: | English |
| Summary: | Carbonate rocks in the Phatthalung area and others in Peninsular Thailand have been
known as the Permian Rat Buri Limestone. The study area is characterized by several isolated
limestone mountains and is located in Phatthalung province. Micropaleontological study of these
carbonate rocks indicates that they should be assigned a late Early to Late Triassic age. The Chaiburi
Formation is newly proposed and divided into three members: the Phukhaothong Dolomite, Chiak
Limestone and Phanomwang Limestone in ascending order. The Phukhaothong Dolomite consists
of thickly bedded to massive dolomite and yields Neospathodus kummeli Sweet, N. waageni Sweet,
N. cfr. waageni Sweet and other conodonts that indicate Dienerian to Smithian (Early Triassic). The
Chiak Limestone Member consists of bedded and laminated limestone with intercalated thin chert
layers and nodules. This limestone commonly yields Early Triassic to Middle Triassic conodonts such
as Neospathodus timorensis (Nogami) and Neospathodus kockeli (Tatge), both reliable indicators of
latest Spathian to early Anisian, and rare occurrences of Neogondolella bulgarica (Budurov and
Stefanov), an indicator of the middle Anisian. The Phanomwang Limestone Member is mostly
massive limestone with intercalated reef limestone (coral buildups) and yields abundant fossils that
indicate Carnian (Late Triassic). Microfacies analysis and stratigraphic sequences of carbonate rocks
in this area show the gradual change of depositional environment from low to high energy conditions. |
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