Preliminary Petrography and geochemistry of volcanic rocks in Lam Sonthi area, Lop Buri province, central Thailand
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Abstract
Lam Sonthi area is located at Lop Buri province, central Thailand. The two volcanic units in this area are Khao Ruak volcanics and Khok Khli volcanics. Further geochemical analysis, the representatives include lavas from Khao Ruak volcanics (hornblende-plagioclase andesite) and selected large clasts of Khok Khli polymictic intermediate breccia (hornblende-plagioclase andesite). The result suggested that their composition is andesite which was identified as calcalkaline affinity. Plots of tectonic diagram of Ti - Zr suggest that the rocks could have been originated in the volcanic arc setting. In addition, the N-MORB normalized patterns show negative
Nb and Ta which could suggest that the magma is associated with subduction zone. Geochemical similarities of volcanics from both areas could suggest that they are probably derived from the same sources. Furthermore, U-Pb zircon ages of volcanics from Khok Khli are 204-205 Ma. This could be assumed that Khao Ruak volcanics might have similar age as well. Similar ages of volcanic rocks were also reported from Khao Kwang Fold-Thrust belt in Saraburi which is 207 Ma. This can also suggest that post-collision magmatism is not limited to plutonic but also volcanic rocks.
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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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