Portal de Periódicos da CAPES

Generation of oceanic-island basalt–type volcanism in the western Trans-Mexican volcanic belt by slab rollback, asthenosphere infiltration, and variable flux melting

2001; Geological Society of America; Volume: 29; Issue: 6 Linguagem: Inglês

10.1130/0091-7613(2001)029 2.0.co;2

1943-2682

Luca Ferrari, Chiara Maria Petrone, L. Francalanci,

Geomagnetism and Paleomagnetism Studies

Research Article| June 01, 2001 Generation of oceanic-island basalt–type volcanism in the western Trans-Mexican volcanic belt by slab rollback, asthenosphere infiltration, and variable flux melting Luca Ferrari; Luca Ferrari 1Centro de Geociencias, Universidad Nacional Autónoma de México, Campus Juriquilla, Apdo. Postal 1-742, C.P. 76001 Querétaro, Querétaro, Mexico Search for other works by this author on: GSW Google Scholar Chiara M. Petrone; Chiara M. Petrone 2Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, D.C. 20015, USA Search for other works by this author on: GSW Google Scholar Lorella Francalanci Lorella Francalanci 3Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, I-50121 Firenze, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Luca Ferrari 1Centro de Geociencias, Universidad Nacional Autónoma de México, Campus Juriquilla, Apdo. Postal 1-742, C.P. 76001 Querétaro, Querétaro, Mexico Chiara M. Petrone 2Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, D.C. 20015, USA Lorella Francalanci 3Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, I-50121 Firenze, Italy Publisher: Geological Society of America Received: 11 Sep 2000 Revision Received: 08 Feb 2001 Accepted: 22 Feb 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (6): 507–510. https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Article history Received: 11 Sep 2000 Revision Received: 08 Feb 2001 Accepted: 22 Feb 2001 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Luca Ferrari, Chiara M. Petrone, Lorella Francalanci; Generation of oceanic-island basalt–type volcanism in the western Trans-Mexican volcanic belt by slab rollback, asthenosphere infiltration, and variable flux melting. Geology 2001;; 29 (6): 507–510. doi: https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Mantle plumes or decompression melting of a heterogeneous mantle have been proposed to explain oceanic-island basalt (OIB) type lavas found in the western Trans-Mexican volcanic belt. We show that mantle plumes cannot account for several geologic observations, whereas decompression melting is unrealistic given the low extension rate in the volcanic arc. On the basis of new geologic and geochemical studies, we propose an alternative model that reconciles geologic data, plate tectonic history, and petrology. Since 8.5 Ma, the volcanic front has migrated trenchward ∼80 km, and OIB began to be emplaced in the rear half of the arc after a period of stalled subduction of the Rivera plate between 7.2 and 4.8 Ma. As a whole, OIB accounts for ∼5% of the total volume of volcanism. Their trace element signatures require an enriched-mantle source, akin to the deep asthenosphere, but also indicate a minor involvement of a subduction component. We propose that during the period of very low convergence at the end of the Miocene, the leading edge of the Rivera slab started to sink into the mantle and continued rolling back until it reached the present dip of 45°. The sinking of the slab may have induced small amounts of asthenosphere to flow laterally into the opening mantle wedge, from the Gulf of California rift on the west and through the subducted Rivera-Cocos plate boundary on the east. This mechanism would produce veins of relatively enriched mantle, which would be able to produce melts with an OIB composition once the flux of fluids released from the subducted slab resumed. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.