Implications from vitrinite reflectance in the fore arc sequence of Coastal Range, Eastern Taiwan

Monday, 15 December 2014
Lih Kae Chim1, Loung-Yie Tsai1, Jiun-Yee Yen2, Chung-Pai Chang3,4, Ying-San Liou2 and Yen Horng -Yen1, (1)NCU National Central University of Taiwan, Jhongli, Taiwan, (2)National Donghua University, Shoufeng, Taiwan, (3)Institute of Geophysics National Central University, Jhongli, Taiwan, (4)Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan
The Luzon arc and Eurasian arc-continental collision caused Taiwan orogeny propagating from north to south. Illite crystallinity in Madagida sections, southern coastal range showed the old age samples gradually increased upward had been reported in previous studies. These results indicated the origin of metamorphic signal can be preserve. In this study, five cross-river sections were chosen from north to south of coastal range: Shuilien north, Tingzhulou, Loho, Sanshien, and Madagida. Then, macerals from mudstones and/or coalified woods were extracted and made into pallets for vitrinite reflectance measurement. Sanshien, Loho and Madagida section mudstone extracted samples show that vitrinite reflectance increased gradationally from the older Fanshuliao Formation to the younger Paliwan Formation. On the other hand, Shuilien north and Tingzhulou sections do not show any significant change in vitrinite reflectance. However, coalified woods pellets showed vitrinite reflectance decrease gradually from older to younger parts in the Loho section, Sanshien section and Madagida section. Some of the Implications about the depositional sequence of coastal range can be derived.