Sedimentology of early Pliocene sandstones in the south-western Taiwan foreland: Implications for basin physiography in the early stages of collision

Sébastien Castelltort, Stefan Nagel, Frédéric Mouthereau, Andrew Tien Shun Lin, Andreas Wetzel, Boris Kaus, Sean Willett, Shao Ping Chiang, Wei Yi Chiu

研究成果: 雜誌貢獻期刊論文同行評審

27 引文 斯高帕斯(Scopus)

摘要

This work presents sedimentological observations and interpretations on three detailed sections of the Pliocene Yutengping/Ailiaochiao formations, deposited in the early stages of collision in Taiwan. Seven facies associations record paleoenvironments of deposition ranging from nearshore to lower offshore with a strong influence of tidal reworking, even in shelfal sub-tidal environments, and a pro-delta setting characterized by mass-flows. The association of shallow facies of the upper offshore to lower shoreface with pro-delta turbidite facies sourced in the orogen to the east suggests a peculiar setting in which turbidite deposition occurred below wave base but on the shelf, in water depths of probably less than 100. m. This adds to the examples of " shallow turbidites" increasingly commonly found in foreland basins and challenges the classical view of a " deep" early underfilled foreland basin. Time series analysis on tidal rhythmites allow us to identify a yearly signal in the form of periodic changes of sand-supply, energy and bioturbation that suggests a marked seasonality possibly affecting precipitation and sediment delivery as well as temperature. The Taiwan foreland basin may also present a potentially high-resolution record in shallow sediments of the early installation of monsoonal circulation patterns in east Asia. We confirm partly the paleogeography during the early stages of collision in Taiwan: the Chinese margin displayed a pronounced non-cylindrical geometry with a large basement promontory to the west in place of the modern Taiwan mountain range. Collision in Taiwan may have happened at once along the whole length of the modern mountain range, instead of progressively from north to south as classically considered.

原文???core.languages.en_GB???
頁(從 - 到)52-71
頁數20
期刊Journal of Asian Earth Sciences
40
發行號1
DOIs
出版狀態已出版 - 4 1月 2011

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