Arid
DOI10.1073/pnas.1200296109
Accumulation of impact markers in desert wetlands and implications for the Younger Dryas impact hypothesis
Pigati, Jeffrey S.1; Latorre, Claudio2,3,4; Rech, Jason A.5; Betancourt, Julio L.6; Martinez, Katherine E.2,3; Budahn, James R.1
通讯作者Pigati, Jeffrey S.
来源期刊PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
出版年2012
卷号109期号:19页码:7208-7212
英文摘要

The Younger Dryas impact hypothesis contends that an extraterrestrial object exploded over North America at 12.9 ka, initiating the Younger Dryas cold event, the extinction of many North American megafauna, and the demise of the Clovis archeological culture. Although the exact nature and location of the proposed impact or explosion remain unclear, alleged evidence for the fallout comes from multiple sites across North America and a site in Belgium. At 6 of the 10 original sites (excluding the Carolina Bays), elevated concentrations of various "impact markers" were found in association with black mats that date to the onset of the Younger Dryas. Black mats are common features in paleowetland deposits and typically represent shallow marsh environments. In this study, we investigated black mats ranging in age from approximately 6 to more than 40 ka in the southwestern United States and the Atacama Desert of northern Chile. At 10 of 13 sites, we found elevated concentrations of iridium in bulk and magnetic sediments, magnetic spherules, and/or titanomagnetite grains within or at the base of black mats, regardless of their age or location, suggesting that elevated concentrations of these markers arise from processes common to wetland systems, and not a catastrophic extraterrestrial impact event.


类型Article
语种英语
国家USA ; Chile
收录类别SCI-E
WOS记录号WOS:000304090600025
WOS关键词CENTRAL ATACAMA DESERT ; MAGNETIC SPHERULES ; CLIMATE-CHANGE ; BLACK MATS ; EXTRATERRESTRIAL ; PALEOHYDROLOGY ; EXTINCTIONS ; ACCRETION ; RESPONSES ; ELEMENTS
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174623
作者单位1.US Geol Survey, Denver Fed Ctr, Denver, CO 80225 USA;
2.Pontificia Univ Catolica Chile, Ctr Estudios Avanzados Ecol & Biodiversidad, Santiago, Chile;
3.Pontificia Univ Catolica Chile, Dept Ecol, Santiago, Chile;
4.Inst Ecol & Biodivers, Santiago, Chile;
5.Miami Univ, Dept Geol & Environm Earth Sci, Oxford, OH 45056 USA;
6.US Geol Survey, Tucson, AZ 85719 USA
推荐引用方式
GB/T 7714
Pigati, Jeffrey S.,Latorre, Claudio,Rech, Jason A.,et al. Accumulation of impact markers in desert wetlands and implications for the Younger Dryas impact hypothesis[J]. United States Geological Survey,2012,109(19):7208-7212.
APA Pigati, Jeffrey S.,Latorre, Claudio,Rech, Jason A.,Betancourt, Julio L.,Martinez, Katherine E.,&Budahn, James R..(2012).Accumulation of impact markers in desert wetlands and implications for the Younger Dryas impact hypothesis.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,109(19),7208-7212.
MLA Pigati, Jeffrey S.,et al."Accumulation of impact markers in desert wetlands and implications for the Younger Dryas impact hypothesis".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 109.19(2012):7208-7212.
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