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Erosion rates across space and timescales from a multi-proxy study of rivers of eastern Taiwan
- Source :
- Global and Planetary Change. 157:174-193
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- We derive erosion rates from detrital zircon fission-track ages and cosmogenic nuclide concentrations from sediments from the modern rivers of eastern Taiwan in order to investigate how surface erosional processes vary in space and time across the young arc-continent collisional orogen of Taiwan. Taiwan is characterized by rapid rates of exhumation, a fluvial and landslide-dominated landscape, high seismicity, high relief and frequent typhoons. The obliquity between the convergence direction and the trend of the plate boundary provides a gradient in uplift and variations in longevity of orogenic activity with a young, immature orogen in the south, a mature orogen in central and northern Taiwan, and perhaps even the cessation of orogeny in the far north. The modern zircon fission-track detrital record is consistent with basement ages that show that much of the orogen is eroding at high rates with basin-wide mean zircon fission-track cooling ages as young as 0.9 Ma. The erosion rates derived from concentrations of cosmogenic nuclides ( 10 Be) provide erosion rates averaged over much shorter timescales, but these two proxies provide estimates of erosion rates that are within error of each other across most of the collisional belt. Erosion rates are lowest in the immature zone of the orogen (
- Subjects :
- Global and Planetary Change
010504 meteorology & atmospheric sciences
Earth science
Fluvial
Orogeny
010502 geochemistry & geophysics
Oceanography
01 natural sciences
Plate tectonics
Basement (geology)
Typhoon
Erosion
Cosmogenic nuclide
Geology
0105 earth and related environmental sciences
Zircon
Subjects
Details
- ISSN :
- 09218181
- Volume :
- 157
- Database :
- OpenAIRE
- Journal :
- Global and Planetary Change
- Accession number :
- edsair.doi...........993ed23eb7ac97f0163d44ad9980fc6a