Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31530.1 |
Tracking ancient magmatism and Cenozoic topographic growth within the Northern Andes forearc: Constraints from detrital U-Pb zircon ages | |
Witt, C.1; Rivadeneira, M.2; Poujol, M.3; Barba, D.2; Beida, D.1; Beseme, G.1; Montenegro, G.2 | |
2017-03-01 | |
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 | France; Ecuador |
英文摘要 | A comparison of detrital zircon ages from the Cenozoic forearc basins in SW Ecuador- NW Peru and those derived from the Amotapes Massif offers a singular opportunity to shed some light on the evolution of the NW Andean margin of South America. An extensive set of pre-Andean U-Pb zircon ages (older than Late Cretaceous) was obtained from 18 detrital samples coming from the Talara, Zorritos, Progreso, and Gulf of Guayaquil-Tumbes forearc basins, as well as from two metasedimentary rocks of the Amotapes Massif. U-Pb age analysis on detrital zircon grains allows a general source-to-sink scenario to be determined for this section of the Andes. These analyses give consistent insights into the early topographic growth during the modern Andean orogeny, the occurrence of proto-Andean magmatic periods in the western margin of Gondwana, and the evolution of the Amotapes Massif within the geodynamical setting of northwestern South America. Zircon ages at ca. 320 Ma and Neoproterozoic clusters for the Amotapes metasediments show significant similarities along the strike of the metamorphic belt, thus defining a common metasedimentary origin, and can be compared with previously dated rocks from the Eastern Cordillera of Peru. These strong similarities demonstrate the presence of a wide, polyphased metamorphic belt that includes the western parts of the Eastern Cordillera, the northern section of the Occidental Cordillera of Peru, and the Amotapes Massif. Detrital sediments of the forearc are marked by a major gap in Early Cretaceous-Jurassic ages and the minor presence of Ordovician (Famatinian orogeny) and Carboniferous-Permian (340-285 Ma) ages. The age spectrum is not compatible with sediment input from the eastern Andes and suggests that the external areas of the Andean chain (e.g., the Western Cordillera) were already uplifted prior to or immediately after forearc initiation during the Paleocene, thus representing a pervasive drainage divide throughout all of the Cenozoic. The Amotapes Massif or other terrains sharing the same age affinities (e.g., the Olmos terrane; Occidental Cordillera of Peru) are likely to represent the best potential sources for pre-Andean zircon grains in the forearc. Age clusters in both source and sink at ca. 600 Ma, 570-560 Ma, and 520 Ma most likely define magmatic periods and may represent first-order constraints for the difficult correlation between proto-Andean magmatic and orogenic periods to the north and south of the Huancabamba deflection. It is unlikely that the Neoproterozoic zircon grains came from the Pan African-Braziliano belts, thus suggesting the onset of significant magmatic activity in this section of the Andes at around 570-560 Ma and probably ca. 600 Ma. The 520 Ma cluster is compatible with the most prominent magmatic period in the southern Andes related to the end of the Pampean orogeny, thus suggesting the existence of a regional proto-Andean magmatic arc during Early Cambrian times. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396813200010 |
WOS关键词 | GEOCHRONOLOGICAL CONSTRAINTS ; TECTONOMAGMATIC EVOLUTION ; METAMORPHIC COMPLEX ; ECUADORIAN ANDES ; LANCONES BASIN ; PERUVIAN ANDES ; TALARA BASIN ; LATE EOCENE ; MARGIN ; ARGENTINA |
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/25213 |
专题 | 地球科学 |
作者单位 | 1.Univ Lille 1, Dept Earth Sci, UMR 8187 LOG, Ave Paul Langevin, F-59655 Villeneuve Dascq, France; 2.Petroamazonas EP, Avenida Naciones Unidas E-7-95 & Avenida Ios Shyr, Quito, Ecuador; 3.Univ Rennes 1, OSUR, UMR CNRS 6118, Geosci Rennes, F-35042 Rennes, France |
推荐引用方式 GB/T 7714 | Witt, C.,Rivadeneira, M.,Poujol, M.,et al. Tracking ancient magmatism and Cenozoic topographic growth within the Northern Andes forearc: Constraints from detrital U-Pb zircon ages[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Witt, C..,Rivadeneira, M..,Poujol, M..,Barba, D..,Beida, D..,...&Montenegro, G..(2017).Tracking ancient magmatism and Cenozoic topographic growth within the Northern Andes forearc: Constraints from detrital U-Pb zircon ages.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Witt, C.,et al."Tracking ancient magmatism and Cenozoic topographic growth within the Northern Andes forearc: Constraints from detrital U-Pb zircon ages".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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