The provenance of submarine gravity flow deposits off Southwestern Taiwan
Date Issued
2014
Date
2014
Author(s)
Chen, Yu-Tung
Abstract
The distinct rainy season in Taiwan frequently induced strong erosion in central mountain range and washing out the surface sediments. The study area of this research is focus on the upper Gaoping submarine canyon, Gaoping shelf, upper Gaoping slope and Fangliao submarine canyon. Gaoping River is one of the main contributors of sediments in the area. According to the sedimentation records, the flooding events usually left turbidite layers deposit on the seafloor and may further triggered gravity flows and transport fresh terrestrial materials into semi-pelagic environment.
Grain size and Pb-210 analysis results are used to distinguish event deposits in cores and discussthe correlation between mineral composition and turbidites. The coarser sediments in the event deposits are usually with higher chlorite which was transported from the Central Mountain Range. The flood events on land can directly bring out coarse sediments from the mountain to ocean. The fine-grained sediments increased during the sedimentation process by gravity redistribution and decreased the chlorites. Follow the gravitational grain size separation of sediments, the fine-grained sediments increased with decreasing chlorite contents. From the Haitang and Morakot Typhoon events, we find the differences of precipitation pattern plays an important role on the characteristic of sediments and their mineral composition.
Subjects
重力流
礦物
Type
thesis
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