Kinematic and Thermal History of the Chuhungkeng Anticline, Central Taiwan
| Autor: | Chun-yang Su, 蘇俊陽 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Taiwan Orogeny to be the result of an oblique collision between the Luzon arc and the passive continental margin of the Eurasia plate since 6.5 Ma. The convergence rata at a rte of 82 mm/yr in a NW-SE direction which results in developing the Central Range and the Western Foothill. In Western Foothill it developed a fold and thrust belt and comprises of late Oligocene to Pliocene-Quaternary shallow marine to fluvial deposit which result from synrift, post-rift and foreland basin sequences. On the contrast to many fault-bend folds were developed in the western foothill, the major structural style of the Chukuangkeng area is a series detachment folding with tight anticline and syncline. In order to reveal the kinematic and thermal history around the Chukuangkeng area we use the apatite fission track dating and combine the viritine data to measure the timing of the folding and constaint the thickness of deposit. We collected sample from outcrop and a 2600 m depth well, located on fold axis of the Chukuangkeng antincline. We found that below the mid-Miocene all strata are total reset and the reset ages are from 1.1~1.8 Ma. The cooling age is similar from east to west that indicates that timing of developing structures is rough at the same time. Considering the total shortening of the Chukuangkeng area is 15 km and we calculate average shortening rate is 8.8 mm/yr since 1.8 Ma. Assuming the average geothermal gradient is 30℃, the uplift rate is 2.1~3.4 mm/yr. In addition, we combining the cooling age and structural analysis we found the kinematic mechanism of detachment folding of the Chukuangkeng results from limb migration rather than limb rotation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|