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Strain Analysis of Rocks in Lansang Waterfall, Tak Province, Northwestern Thailand |
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| รหัสดีโอไอ | |
| Creator | Peekamon Ponmanee |
| Title | Strain Analysis of Rocks in Lansang Waterfall, Tak Province, Northwestern Thailand |
| Contributor | Pitsanupong Kanjanapayont |
| Publisher | Department of Geology, Chulalongkorn University |
| Publication Year | 2556 |
| Journal Title | Bulletin of Earth Sciences of Thailand (BEST) |
| Journal Vol. | 6 |
| Journal No. | 1 |
| Page no. | 40-50 |
| Keyword | Strain analysis, Fry method, Lansang Waterfall, Thailand |
| URL Website | https://www.bestjournal.org/ |
| Website title | Bulletin of Earth Sciences of Thailand |
| ISSN | 1906-280X |
| Abstract | Lansang Waterfall is located inside the Lansang National Park, Tak, northwestern Thailand, and claimed to be a part of the affected zone of past India penetration. Such area exposed the mylonitic core, which made of reworked metamorphic rocks in the greenschist facies with the steep foliation and nearly horizontal stretching lineation. These characteristic imply nearly plane strain and also present clear left- lateral shear criteria on various markers for instance boudin trails or deformed minerals, thus it suggested a proper area for strain quantitative analysis in other previous studies. For the strain analysis in sense of quantitative, the Fry method was applied for quantify the finite strain of rock from recrystallized quartz grain in the mylonitic gneisses of Lansang waterfall. The strain magnitude, including with the strain ratio, Rs obtained from the strain ellipsoid of Fry's diagram are ranged from 1.40 to 1.91. The longest axes of recrystallized quartz grains intense the characteristic of left- lateral shear sense on this area. Based on these useful data led it be concluded that a significant component of simple shear was involved and related within an area of Lansang waterfall. |
