Arid
DOI10.1029/2005TC001923
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
ISSN0278-7407
EISSN1944-9194
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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