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Research Article
ScienceAsia 34 (2008): 007-022 |doi: 10.2306/scienceasia1513-1874.2008.34.007
Provenance and Tectonic Setting of the Permian
Nam Duk Formation, North - Central Thailand:
Implications for Geodynamic Evolution
Kitsana Malilaa,b*, Chongpan Chonglakmanib, Feng Qinglaic, and Dietrich Helmcked
ABSTRACT: The Permain Nam Duk Basin is a part of the Phetchabun Fold Belt of central mainland Thailand. This basin is considered to be a geological backbone of tectonic evolution during the Late Paleozoic in Thailand. In this study, provenance analysis of the siliciclastic sediments of the Nam Duk Formation has been carried out based on geochemical and cathodoluminescence techniques. The geochemical result indicates that the siliciclastic sediment of Lower-Middle Permian “pelagic sequence” is a transitional deposit between an oceanic island arc and a continental island arc environments and is derived mainly from metabasic sources. During middle Middle to late Middle Permian, the provenance signatures of sandstones and shales from the “flysch” and the “molasse” sequences show indications of ultramafic-mafic igneous provenance and they were deposited in a continental island arc environment. The result supports the interpretation of Nan- Uttaradit ophiolitic belt north-west of the Nam Duk Basin as a major terrane which supplied siliciclastic sediments to the Nam Duk Basin during Middle-Late Permian.
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a PTT Exploration and Production Company Limited, PTTEP Office Building, 555 Vibhavadi Rangsit Rd., Chatuchak, Bangkok 10900, Thailand.
b School of Geotechnology, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, 30000 Thailand.
c Faculty of Earth Science, China University of Geosciences, Wuhan, 430074 P.R. of China. d Goettinger Zentrum Geowissenschaften (GZG), D-37077 Goettingen, Germany.
* Corresponding author, E-mail: KitsanaM@pttep.com and kitsana_malila@hotmail.com
Received 23 Jul 2007,
Accepted 9 Jan 2008
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