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

doi:10.1073/pnas.1512549112

CORC > 自然资源部第一海洋研究所 > 自然资源部第一海洋研究所 > 业务部门 > 海洋地质与地球物理研究室

	Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias Mountains, Alaska
	Gulick, Sean P. S.1; Jaeger, John M.2; Mix, Alan C.3; Asahi, Hirofumi 4; Bahlburg, Heinrich 5; Belanger, Christina L.6; Berbel, Glaucia B. B.7; Childress, Laurel 8; Cowan, Ellen 9; Drab, Laureen 10
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2015-12-08
卷号	112 期号:49 页码:15042-15047
关键词	tectonic-climate interactions orogenesis Mid-Pleistocene transition ass flux ocean drilling
ISSN号	0027-8424
DOI	10.1073/pnas.1512549112
英文摘要	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 (similar to 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 (similar to 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.
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资助项目	Natural Environment Research Council[NE/L002426/1]
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATL ACAD SCIENCES
WOS记录号	WOS:000365989800031
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3563]
专题	业务部门_海洋地质与地球物理研究室
作者单位	1.Univ Texas Austin, Jackson Sch Geosci, Inst Geophys, Austin, TX 78758 USA; 2.Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA; 3.Oregon State Univ, Coll Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 4.Korea Polar Res Inst, Inchon 406840, South Africa; 5.Univ Munster, Inst Geol & Palaontol, D-48149 Munster, Germany; 6.South Dakota Sch Mines & Technol, Dept Geol & Geol Engn, Rapid City, SD 57701 USA; 7.Univ Sao Paulo, Inst Oceanog, Dept Oceanog Fis Quim & Geol, BR-05508120 Sao Paulo, SP, Brazil; 8.Northwestern Univ, Dept Earth & Planetary Sci, Evanston, IL 60208 USA; 9.Appalachian State Univ, Dept Geol, Boone, NC 28608 USA; 10.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA;
推荐引用方式 GB/T 7714	Gulick, Sean P. S.,Jaeger, John M.,Mix, Alan C.,et al. Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias Mountains, Alaska[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2015,112(49):15042-15047.
APA	Gulick, Sean P. S..,Jaeger, John M..,Mix, Alan C..,Asahi, Hirofumi.,Bahlburg, Heinrich.,...&Swartz, John M..(2015).Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias Mountains, Alaska.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,112(49),15042-15047.
MLA	Gulick, Sean P. S.,et al."Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias Mountains, Alaska".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 112.49(2015):15042-15047.