The Pengchiayu Volcano: A Holocene Surtsey-Type Eruption in North Offshore Island of Taiwan ...

• Main Authors: Song, Sheng-Rong, Lu, Yi-Chia
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Surtsey; West Island
• Online Access: https://dx.doi.org/10.57757/iugg23-2391; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018366

<!--!introduction!--> The Pengchiayu, located at the offshore island in north Taiwan, is a volcanic island with controversial eruptive ages ranging from 2.1 Ma to less than 0.29 Ma, dated by K-Ar method. Geomorphologically, a crater with diameter about 50 m wide and fresh reddish scoria in top crops out in northwest tip, and a depression, probably was a tuff cone, occurs in central part of the island. Geologically, well bedded base surges with thickness totally over 30 m thick and ranging from few to tens of centimeters expose in southeast and west island. The lava flows with Aa and pahoehoe structures cover on the top or outflow from a breach of cone to the south and the north. Meanwhile, glassy scoria shows very fresh characters and almost no weathering on surface. In addition, a whole-coring about 100 m deep has been drilled and showed the lithology being composed of the thick lavas with vesicles, reddish scoria, weathered soils, base-surges and lavas from bottom to top. This sequence infers that ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...