Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1029/2005TC001923 |
Paleomagnetism and tectonics of the southern Atacama Desert (25-28 degrees S), northern Chile | |
Arriagada, Cesar; Roperch, Pierrick; Mpodozis, Constantino; Fernandez, Rodrigo | |
通讯作者 | Arriagada, Cesar |
来源期刊 | TECTONICS |
ISSN | 0278-7407 |
EISSN | 1944-9194 |
出版年 | 2006 |
卷号 | 25期号:4 |
英文摘要 | [1] We report paleomagnetic results for 131 sites from the modern forearc of northern Chile (25 degrees S and 28 degrees S). Remanent magnetization in volcanic and intrusive rocks is mostly primary, while a secondary magnetization is observed in sedimentary rocks. Comparison of locality-mean directions with expected paleomagnetic directions indicates vertical axis rotations from -7.3 degrees +/- 21.6 degrees counterclockwise to 52.7 degrees +/- 17 degrees clockwise. Jurassic to Early Cretaceous rocks from the Coastal Cordillera and Cretaceous to Paleocene rocks from the Central Depression show similar magnitude (> 30 degrees) clockwise rotations, while more variable rotations occur in Mesozoic to Eocene rocks of the Precordillera. Clockwise rotations in Mesozoic and Paleogene rocks occur in the Chilean Frontal Cordillera south of 27 degrees 30’s. Paleomagnetic results in three large Miocene ignimbrite sheets overlying rotated and nonrotated older rocks in the Precordillera and Pre-Andean Depression which show no relative rotation between sites indicate that most rotations within the study area occurred prior to 18 Ma (early Miocene) and likely during and after the "Incaic’’ tectonic event, which affected large tracts of the central Andes. The postulated onset of rotations in the north Chilean forearc was contemporaneous with the beginning of horizontal shortening and uplift of the Eastern Cordillera in Bolivia and northwestern Argentina. Rotation of the Chilean forearc, enhancement of the curvature of the central Andes, and the formation of the Bolivian Orocline seem to be, for the most part, closely linked to the evolution of the Eocene-Oligocene tectonics of the Eastern Cordillera. |
类型 | Article |
语种 | 英语 |
国家 | Chile |
收录类别 | SCI-E |
WOS记录号 | WOS:000238944600002 |
WOS关键词 | CLOCKWISE BLOCK ROTATIONS ; CENTRAL ANDEAN PLATEAU ; PUNA PLATEAU ; COASTAL CORDILLERA ; BOLIVIAN OROCLINE ; FORE-ARC ; NORTHWESTERN ARGENTINA ; NAZCA FARALLON ; FAULT SYSTEMS ; POLAR WANDER |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
来源机构 | French National Research Institute for Sustainable Development |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/153113 |
作者单位 | (1)Univ Chile, Dept Geol, Inst Rech Dev, Santiago, Chile;(2)Serv Nacl Geol & Mineria, Santiago, Chile |
推荐引用方式 GB/T 7714 | Arriagada, Cesar,Roperch, Pierrick,Mpodozis, Constantino,et al. Paleomagnetism and tectonics of the southern Atacama Desert (25-28 degrees S), northern Chile[J]. French National Research Institute for Sustainable Development,2006,25(4). |
APA | Arriagada, Cesar,Roperch, Pierrick,Mpodozis, Constantino,&Fernandez, Rodrigo.(2006).Paleomagnetism and tectonics of the southern Atacama Desert (25-28 degrees S), northern Chile.TECTONICS,25(4). |
MLA | Arriagada, Cesar,et al."Paleomagnetism and tectonics of the southern Atacama Desert (25-28 degrees S), northern Chile".TECTONICS 25.4(2006). |
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