Arid
DOI10.1130/B30978.1
Landscape modification in response to repeated onset of hyperarid paleoclimate states since 14 Ma, Atacama Desert, Chile
Jordan, Teresa E.1; Kirk-Lawlor, Naomi E.1; Blanco P., Nicolas2; Rech, Jason A.3; Cosentino, Nicolas J.1
通讯作者Jordan, Teresa E.
来源期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
EISSN1943-2674
出版年2014
卷号126期号:7-8页码:1016-1046
英文摘要

The landscape of the hyperarid Atacama Desert in northern Chile records extremely slow change on Earth’s surface. Disputed ages for the onset of hyperaridity range from the late Paleogene through the Pleistocene. A long-term paleoclimate record is recorded in a nonmarine basin whose fill is primarily alluvial strata. For this setting, the primary proxies for climate state are the mineralogical and chemical composition of soil, which varies across a precipitation gradient, and the landforms and deposits of alluvial fans. During the most recent similar to 15 million years, five climate-related landscape stages are resolved for the Pampa del Tamarugal sedimentary basin, with each successively younger stage inset lower in the local topography than its predecessor. The earliest landscape stage is expressed as a set of alluvial strata inherited from a time of arid or semi-arid climate, ca. 14-12 Ma. The younger four landscape stages generated a composite long-lasting exposure surface. Predominantly hyperarid conditions have persisted since ca. 12 +/- 1 Ma, during which four intervals of arid to semi-arid climate occurred. Each wet interval was short lived, a million years or less, whereas some of the hyperarid periods were lengthy, 1-5 m.y. The hyperarid intervals were roughly 11-5.5 Ma, 4.5-4 Ma, 3.6-2.6 Ma, 2.2-1 Ma, and repeated intervals during the last 1 m.y. The onset of hyperaridity ca. 12 Ma likely reflects the growth of the Andes Mountains above a climate threshold. In contrast, sea surface temperature variability likely has controlled Atacama paleoclimate changes since the late Miocene.


类型Article
语种英语
国家USA ; Chile
收录类别SCI-E
WOS记录号WOS:000341193900008
WOS关键词ANDEAN FORE-ARC ; SURFACE TEMPERATURE RECONSTRUCTION ; CENOZOIC CLIMATE-CHANGE ; WESTERN SOUTH-AMERICA ; NORTHERN CHILE ; ALLUVIAL-FAN ; EARLY PLIOCENE ; LATE NEOGENE ; MIOCENE AGE ; REG SOILS
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/182256
作者单位1.Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA;
2.Serv Nacl Geol & Mineria, Santiago, Chile;
3.Miami Univ, Dept Geol, Oxford, OH 45056 USA
推荐引用方式
GB/T 7714
Jordan, Teresa E.,Kirk-Lawlor, Naomi E.,Blanco P., Nicolas,et al. Landscape modification in response to repeated onset of hyperarid paleoclimate states since 14 Ma, Atacama Desert, Chile[J],2014,126(7-8):1016-1046.
APA Jordan, Teresa E.,Kirk-Lawlor, Naomi E.,Blanco P., Nicolas,Rech, Jason A.,&Cosentino, Nicolas J..(2014).Landscape modification in response to repeated onset of hyperarid paleoclimate states since 14 Ma, Atacama Desert, Chile.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,126(7-8),1016-1046.
MLA Jordan, Teresa E.,et al."Landscape modification in response to repeated onset of hyperarid paleoclimate states since 14 Ma, Atacama Desert, Chile".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 126.7-8(2014):1016-1046.
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