Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1073/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
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ISSN | 0027-8424 |
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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