Sedimentology and foreland basin paleogeography during Taiwan arc continent collision

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題名:	Sedimentology and foreland basin paleogeography during Taiwan arc continent collision
作者:	林殿順;Nagel, Stefan;Castelltort, Sébastien;Wetzel, Andreas;Willett, Sean D.;Mouthereau, Frédéric;Lin, Andrew T.
貢獻者:	地球科學學院地球科學學系
關鍵詞:	Earth Sciences;Foreland basin;Lithofacies;Oblique collision;Paleogeography;Sciences of the Universe;Sedimentary environment;Taiwan
日期:	2013-01-30
上傳時間:	2026-04-23 11:42:55 (UTC+8)
出版者:	Elsevier Ltd.;Elsevier Ltd
摘要:	摘要： ► We apply detailed stratigraphic analysis in the Western foreland basin in Taiwan. ► Between ∼12 and 2Ma the basin paleogeography remains relatively unchanged. ► The proximal–distal facies trend is reversed to the SW since ∼2Ma. ► Southward propagation rates are 5–20km/Ma from 2 to 0.5Ma, and then 106 to 120km/Ma. ► Typhoons may be underestimated in their importance on the stratigraphic record. The Western foreland basin in Taiwan originated through the oblique collision between the Luzon volcanic arc and the Asian passive margin. Crustal flexure adjacent to the growing orogenic load created a subsiding foreland basin. The sedimentary record reveals progressively changing sedimentary environments influenced by the orogen approaching from the East. Based on sedimentary facies distribution at five key stratigraphic horizons, paleogeographic maps were constructed. The maps highlight the complicated basin-wide dynamics of sediment dispersal within an evolving foreland basin. The basin physiography changed very little from the middle Miocene (∼12.5Ma) to the late Pliocene (∼3Ma). The transition from a passive margin to foreland basin setting in the late Pliocene (∼3Ma), during deposition of the mud-dominated Chinshui Shale, is dominantly marked by a deepening and widening of the main depositional basin. These finer grained Taiwan derived sediments clearly indicate increased subsidence, though water depths remain relatively shallow, and sedimentation associated with the approach of the growing orogen to the East. In the late Pleistocene as the shallow marine wedge ahead of the growing orogen propagated southward, the proximal parts of the basin evolved into a wedge-top setting introducing deformation and sedimentation in the distal basin. Despite high Pleistocene to modern erosion/sedimentation rates, shallow marine facies persist, as the basin remains open to the South and longitudinal transport is sufficient to prevent it from becoming overfilled or even fully terrestrial. Our paleoenvironmental and paleogeographical reconstructions constrain southward propagation rates in the range of 5–20km/Myr from 2Ma to 0.5Ma, and 106–120km/Myr between late Pleistocene and present (0.5–0Ma). The initial rates are not synchronous with the migration of the sediment depocenters highlighting the complexity of sediment distribution and accumulation in evolving foreland basins. 出版者： Elsevier Ltd 出版日期： 2013-01-30 出處： Journal of Asian Earth Sciences, 2013-01, Vol.62, p.180-204 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2012 Elsevier Ltd 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 1367-9120 識別號： ISSN: 0743-9547 識別號： EISSN: 1878-5786 識別號： DOI: 10.1016/j.jseaes.2012.09.001
顯示於類別:	[地球科學學系] 期刊論文

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