Volcanic Facies of the Doi Phra Baht Volcanic Deposits, Mueang District, Lampang Province, Thailand
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Abstract
In Thailand, the Pre-Jurassic Chiang Khong – Tak volcanic belt has been renowned for the most voluminous igneous rocks and various magmatic suites, where rhyolite – rhyodacite and their pyroclastic equivalents are predominant. A sequence of volcanic rocks exposed at Km marks 8-10 on Highway number 11 (LampangDenchai), Mueang District, Lampang Province offers a remarkable section for facies analysis and thus leads to the understanding of clast – forming, transportation, and deposition processes. From field observation and petrographic study, the rocks can be classified as pyroclastic facies and volcaniclastic/volcanogenic sedimentary facies. The pyroclastic facies is a mass flow deposit that includes welded and non-welded ignimbrite in part. It was interpreted to be products of subaerial eruption of silicic magma and deposited onshore or a shallow water environment. The volcaniclastic/volcanogenic sedimentary facies is characterized by well-bedded volcanic mudstone and volcanic sandstone, with laminae to thin-beds of black mudstone/claystone that contain sedimentary structures, such as load casts and flame structures. Subaqueous depositional environment with influence of turbidity current is proposed for transportation and deposition of this facies.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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