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Preliminary Petrography and geochemistry of volcanic rocks in Lam Sonthi area, Lop Buri province, central Thailand |
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| รหัสดีโอไอ | |
| Creator | Saowaphap Uthairat |
| Title | Preliminary Petrography and geochemistry of volcanic rocks in Lam Sonthi area, Lop Buri province, central Thailand |
| Contributor | Abhisit Salam, Takayuki Manaka |
| Publisher | Department of Geology, Chulalongkorn University |
| Publication Year | 2564 |
| Journal Title | Bulletin of Earth Sciences of Thailand (BEST) |
| Journal Vol. | 13 |
| Journal No. | 1 |
| Page no. | 47-58 |
| Keyword | volcanic rocks, calc-alkaline andesite, Loei-Phetchabun-Nakhon Nayok volcanic belt |
| URL Website | https://www.bestjournal.org/ |
| Website title | Bulletin of Earth Sciences of Thailand |
| ISSN | 1906-280X |
| 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 calc-alkaline 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. |
