Origin of the DUPAL anomaly in mantle xenoliths of Patagonia (Argentina) and geodynamic consequences
作者: Maurizio MazzucchelliAnna CiprianiChristophe HémondAlberto ZanettiGustavo Walter BertottoCarlos Alberto Cingolani
作者单位: 1Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Via Campi, 103, I-41125 Modena, Italy
2Lamont–Doherty Earth Observatory, Columbia University, 61 Route 9 W, Palisades, NY 10964, USA
3Domaines Océaniques, Institut Universitaire Européen de la Mer, Université de Brest & CNRS, Place Nicolas Copernic, F-29280 Plouzané, France
4Istituto di Geoscienze e Georisorse — CNR, U.O.S. di Pavia, Via Ferrata 1, I-27100 Pavia, Italy
5INCITAP. UNLPam-CONICET, Calle Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina
6Centro de Investigaciones Geológicas, CONICET-Universidad Nacional de La Plata, Calle 1 n. 644, B1900TAC La Plata, Argentina
刊名: LITHOS, 2016, Vol.248-251 , pp.257-271
来源数据库: Elsevier Journal
DOI: 10.1016/j.lithos.2016.01.010
关键词: Mantle xenolithsClinopyroxeneSr–Nd–Pb isotopesDUPALTres LagosPatagonia
原始语种摘要: Abstract(#br)The sub-continental lithospheric mantle of South America has been known for some time to carry the DUPAL isotope anomaly as seen in volcanics from the Paraná volcanic province. However, this has not allowed discriminating whether the DUPAL anomaly is a primary feature of the mantle source or acquired during the upwelling and emplacement of the primary magmas. We discovered mantle xenoliths from the Tres Lagos location in Patagonia that carry evidence of percolation by metasomatic melts that imparted the DUPAL isotope anomaly signature. We discuss a model that requires four isotope components (LCC, EM2, HIMU and DM) to account for the Sr, Nd and Pb isotope variability of our samples. We propose that upwelling of hot astenosphere during the Miocene could have triggered the...
全文获取路径: Elsevier  (合作)
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影响因子:3.779 (2012)

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