Anomalous Early Triassic Sediment Fluxes due to Elevated Weathering Rates
INTRODUCTION The ～252-million-year-old Permian/Triassic boundary (PTB) represents the largest mass extinction event in the Phanerozoic record, during which ～90％ of marine invertebrate species died out (Erwin et al., 2002). Terrestrial ecosystems were also devastated, resulting in major extinctions among tetrapods (Retallack, 1995) and a shift from gymnosperm-dominated floras to rapidly growing early successional communities dominated by lycopsids and ferns (Looy et al., 2001). Widespread loss of vegetative cover is thought to have led to massive erosion in terrestrial areas, as shown by a shift from fine-grained meandering to conglomeratic braided fluvial fades (Ward et al., 2000; Newell et al., 1999), by redeposition of soil clasts (pedoliths; Retallack, 2005) and by increased sedimentation rates in terrestrial successions (Retallack,1999).
Thomas J Algeo
Department of Geology, University of Cincinnati, Cincinnati OH 45221, USA
国际会议
The International Conference of Geobiology(地球生物学国际研讨会)
武汉
英文
107-110
2010-06-03（万方平台首次上网日期，不代表论文的发表时间）