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DOI	10.1016/j.earscirev.2020.103379
	The fate of the Farallon slab beneath Patagonia and its links to Cenozoic intraplate magmatism, marine transgressions and topographic uplift
	Navarrete C.; Gianni G.; Massaferro G.; Butler K.
发表日期	2020
ISSN	0012-8573
卷号	210
英文摘要	The arrival and subsequent stagnation of the Farallon/Nazca slab at the mantle transition zone below southern South America triggered seemingly unrelated large-scale geological processes in the second half of the Cenozoic. During this period, three poorly understood regional events have characterized the more recent geological history of Patagonia: i) the development of intense intraplate magmatism, ii) two large-scale marine transgressions, and iii) abnormally accelerated topographic uplift. We propose a geodynamic model that connects the subducting slab mechanisms to these events based on seismic tomography, 2-D kinematic reconstructions, dynamic subsidence models and a detailed literature review. According to our kinematic reconstruction, after the Paleocene-Eocene opening of the Aluk (Phoenix)/Farallon slab window, the Farallon oceanic slab arrived to the mantle transition zone below Patagonia at ~36–32 Ma. This event caused the physical perturbation of this mantle layer, and dehydration melting of the uplifted portions by wadsleyite breakdown, triggering an intense Oligocene-middle Miocene intraplate magmatism significantly influenced by subduction-derived fluids. Simultaneously, due to increasing disturbance of the lower mantle during the Farallon slab penetration and stagnation in the mantle transition zone, a large subduction-induced mantle flow cell began to tilt the South American plate. Tilting drove the two large marine transgressions which inundated much of the southern Argentina and Chile. Finally, in the latest Miocene-Pleistocene, Farallon-Nazca slab break-off induced the decompression melting of the sub-slab asthenosphere, generating the most recent magmatic episode in the north-central Patagonia. This magmatism was partially contemporaneous with the Chile ridge (Nazca/Antarctic) slab window-related southern Patagonian igneous activity; and although both episodes show evidence of mantle metasomatic inheritance, the north-central magmatism shows higher Th/La and 87Sr/86Sr ratios, and lower εNd values, suggesting possible contributions from the stagnant Farallon slab (wet plumes?). These modern magmatic episodes can be directly linked to the Quaternary uplift of Patagonia by mantle upwelling. © 2020 Elsevier B.V.
英文关键词	Cenozoic intraplate magmatism; Mantle transition zone; Mantle-driven marine incursion; Patagonia
语种	英语
scopus关键词	Cenozoic; intraplate process; magmatism; mantle plume; mantle upwelling; slab; topographic effect; transgression; uplift; Patagonia
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209502
作者单位	Laboratorio Patagónico de Petro-Tectónica, Universidad Nacional de la Patagonia San Juan Bosco, Dpto de Geología, Argentina; CONICET, Argentina; Instituto de estudios andinos Don Pablo Groeber, IDEAN, Universidad de Buenos Aires, Argentina; IPGP, CONICET, Argentina; Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	Navarrete C.,Gianni G.,Massaferro G.,et al. The fate of the Farallon slab beneath Patagonia and its links to Cenozoic intraplate magmatism, marine transgressions and topographic uplift[J],2020,210.
APA	Navarrete C.,Gianni G.,Massaferro G.,&Butler K..(2020).The fate of the Farallon slab beneath Patagonia and its links to Cenozoic intraplate magmatism, marine transgressions and topographic uplift.EARTH-SCIENCE REVIEWS,210.
MLA	Navarrete C.,et al."The fate of the Farallon slab beneath Patagonia and its links to Cenozoic intraplate magmatism, marine transgressions and topographic uplift".EARTH-SCIENCE REVIEWS 210(2020).