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DOI | 10.1130/B31620.1 |
Tectono-metamorphic evolution of a convergent back-arc: The Famatinian orogen, Sierra de Quilmes, Sierras Pampeanas, NW Argentina | |
Finchlt, Melanie A.1; Weinberg, Roberto F.1; Hasalova, Pavlina2; Becchio, Raul3; Gabriela Fuentes, M.3; Kennedy, Allen4 | |
2017-11-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; Czech Republic; Argentina |
英文摘要 | Back-arcs are hot regions of enduring weakness in the hinterland of subduction zones that are commonly sites of strain localization, forming mobile belts that, in some cases, develop into mountain belts. Their evolution results from their strength, a function of thickness, heat flux, and stresses. Contractional back-arcs may be too weak to form thick crusts, whereas in other cases, they can thicken considerably and lead to mountain building. The stress and thermal histories of back-arcs can be retrieved from investigation of the relationships between deformation and metamorphism. The 490430 Ma Famatinian orogen of the Sierras Pampeanas is associated with a back-arc that has a complex development. We focus on the Sierra de Quilmes within the northern section of the back-arc and present new structural data tied to anatexis and constrained by geochronology. We find that low-pressure-high-temperature conditions prevailed over an similar to 35 m.y. thermal peak between 497 and 461 Ma, as indicated by U/Pb ages of monazite. Anatexis coincided with thrusting to the west and northwest, as evidenced by leuco-somes in axial planes of folds and in thrust planes. As rocks were thrust upward, they cooled, melt solidified, and deformation localized into two major thrust zones. These record the same thrust-to-the-west or northwest kinematics as the earlier syn-anatectic deformation and ultimately placed hot rocks over cold ones. Continuous thrusting during cooling from peak metamorphism, accompanied by strain localization, is consistent with a number of shear zones in the northern Sierras Pampeanas. The low-pressure metamorphic assemblages indicate that shortening was not accompanied by pronounced crustal thickening, suggesting that the litho-sphere was too hot, and the partially melted crust was too weak for substantial stacking. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000414365400013 |
WOS关键词 | KILOMETER-THICK ULTRAMYLONITE ; SHEAR ZONE ; U-PB ; PRECORDILLERA TERRANE ; WESTERN GONDWANA ; VARISCAN OROGEN ; DEFORMATION ; MARGIN ; MONAZITE ; BASEMENT |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25060 |
专题 | 地球科学 |
作者单位 | 1.Monash Univ, Sch Earth Atmosphere & Environm, Clayton, Vic 3800, Australia; 2.Czech Geol Survey, Ctr Lithospher Res, Klarov 3, Prague 11821 1, Czech Republic; 3.Natl Univ Salta, Inst Geonorte, Inst Invest Energia Convenc INENCO, CONICET, Ave Bolivia 5150, RA-4400 Salta, Argentina; 4.Curtin Univ, Dept Phys & Astron, Bentley, WA 6102, Australia |
推荐引用方式 GB/T 7714 | Finchlt, Melanie A.,Weinberg, Roberto F.,Hasalova, Pavlina,et al. Tectono-metamorphic evolution of a convergent back-arc: The Famatinian orogen, Sierra de Quilmes, Sierras Pampeanas, NW Argentina[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Finchlt, Melanie A.,Weinberg, Roberto F.,Hasalova, Pavlina,Becchio, Raul,Gabriela Fuentes, M.,&Kennedy, Allen.(2017).Tectono-metamorphic evolution of a convergent back-arc: The Famatinian orogen, Sierra de Quilmes, Sierras Pampeanas, NW Argentina.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Finchlt, Melanie A.,et al."Tectono-metamorphic evolution of a convergent back-arc: The Famatinian orogen, Sierra de Quilmes, Sierras Pampeanas, NW Argentina".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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