Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias mountains, Alaska

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dc.contributor.author Gulick, S.P.S.
dc.contributor.author Jaeger, J.M.
dc.contributor.author Mix, A.C.
dc.contributor.author Asahi, H.
dc.contributor.author Bahlburg, H.
dc.contributor.author Belanger, C.L.
dc.contributor.author Berbel, G.B.B.
dc.contributor.author Childress, L.
dc.contributor.author Cowan, E.
dc.contributor.author Drab, L.
dc.contributor.author Forwick, M.
dc.contributor.author Fukumura, A.
dc.contributor.author Ge, S.
dc.contributor.author Gupta, S.M.
dc.contributor.author Kioka, A.
dc.contributor.author Konno, S.
dc.contributor.author LeVay, L.J.
dc.contributor.author Marz, C.
dc.contributor.author Matsuzaki, K.M.
dc.contributor.author McClymont, E.L.
dc.contributor.author Moy, C.
dc.contributor.author Muller, J.
dc.contributor.author Nakamura, A.
dc.contributor.author Ojima, T.
dc.contributor.author Ribeiro, F.R.
dc.contributor.author Ridgway, K.D.
dc.contributor.author Romero, O.E.
dc.contributor.author Slagle, A.L.
dc.contributor.author Stoner, J.S.
dc.contributor.author St-Onge, G.
dc.contributor.author Suto, I.
dc.contributor.author Walczak, M.D.
dc.contributor.author Worthington, L.L.
dc.contributor.author Bailey, I.
dc.contributor.author Enkelmann, E.
dc.contributor.author Reece, R.
dc.contributor.author Swartz, J.M.
dc.date.accessioned 2016-01-08T06:48:58Z
dc.date.available 2016-01-08T06:48:58Z
dc.date.issued 2015
dc.identifier.citation Proceedings of the National Academy of Sciences of the United States of America, vol.112(49); 2015; 15042-15047
dc.identifier.uri http://drs.nio.org/drs/handle/2264/4893
dc.description.abstract Erosion, sediment production, and routing on a tectonically active continental margin reflect both tectonic and climatic processes; partitioning the relative importance of these processes remains controversial. Gulf of Alaska contains a preserved sedimentary record of the Yakutat Terrane collision with North America. Because tectonic convergence in the coastal St. Elias orogen has been roughly constant for 6 My, variations in its eroded sediments preserved in the offshore Surveyor Fan constrain a budget of tectonic material influx, erosion, and sediment output. Seismically imaged sediment volumes calibrated with chronologies derived from Integrated Ocean Drilling Program boreholes show that erosion accelerated in response to Northern Hemisphere glacial intensification (~2.7 Ma) and that the 900-km-long Surveyor Channel inception appears to correlate with this event. However, tectonic influx exceeded integrated sediment efflux over the interval 2.8–1.2 Ma. Volumetric erosion accelerated following the onset of quasi-periodic (~100-ky) glacial cycles in the mid-Pleistocene climate transition (1.2–0.7 Ma). Since then, erosion and transport of material out of the orogen has outpaced tectonic influx by 50–80%. Such a rapid net mass loss explains apparent increases in exhumation rates inferred onshore from exposure dates and mapped out-of-sequence fault patterns. The 1.2-My mass budget imbalance must relax back toward equilibrium in balance with tectonic influx over the timescale of orogenic wedge response (millions of years). The St. Elias Range provides a key example of how active orogenic systems respond to transient mass fluxes, and of the possible influence of climate-driven erosive processes that diverge from equilibrium on the million-year scale
dc.language.iso en
dc.publisher National Academy of Sciences of the United States of America
dc.rights Copyright [2015]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.title Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias mountains, Alaska
dc.type Journal Article

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