Slab-tearing following ridge-trench collision: Evidence from Miocene volcanism in Baja California, México

Pallares, Carlos; Maury, René C.; Bellón, Hervé; Royer, Jean‐Yves; Calmus, Thierry; Aguillón‐Robles, Alfredo; Cotten, Joseph; Benoît, Mathieu; Michaud, François; Bourgois, Jacques

doi:10.1016/j.jvolgeores.2006.11.002

Cited by 111 publications

(80 citation statements)

References 93 publications

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“…12, profile at 29 • N) which may connect with the low associated with the BTF could be interpreted as a slab window as shown in Fig. 2 in Pallares et al (2007).…”

Section: Discussionmentioning

confidence: 97%

“…Tholeiites and alkali basalts of subslab origin rose through this window, while the adakites were derived from the partial melting of its upper lip, close to the trench. Pallares et al (2007) report that the magmatic activity continued after the cessation of the subduction (11.5-7.5 Ma) in a 600-km long and ∼100-km wide array, parallel to the trench, emplacing adakites, NEBs and andesites. Castillo (2008) instead proposes that the Pacific asthenosphere was the direct source for post-subduction magmas that erupted in Baja California, considering the chronology of magmatism and the isotopic composition of lavas.…”

Section: Discussionmentioning

confidence: 99%

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Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Luccio

Persaud

Clayton

2014

Geophysical Journal International

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“…12, profile at 29 • N) which may connect with the low associated with the BTF could be interpreted as a slab window as shown in Fig. 2 in Pallares et al (2007).…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Luccio

Persaud

Clayton

2014

Geophysical Journal International

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“…Among the 13 older on-land basic rocks (>13 Ma), nine rocks belongs to Southern Sonora (19-28 Ma;Till et al, 2009), three rocks (27-45 Ma age; Albrecht and Goldstein, 2000) belong to Sierra Madre Occidental, northwestern Mexico and the one rock (20.06 Ma age; Pallares et al, 2007) belongs to Comondú Formation (from Cataviña; Pallares et al, 2007). It is reported that the Sierra Madre Occidental and Comondú arc were formed as the result of the subduction of oceanic lithosphere beneath western North America during Eocene-Oligocene and Lower Miocene respectively (McDowell and Keizer, 1977;Stock and Lee, 1994;Benoit et al, 2002).…”

Section: Tectonomagmatic Origin Of On-shore Basic Rocks Of Northwest mentioning

confidence: 99%

Application of four sets of tectonomagmatic discriminant function based diagrams to basic rocks from northwest Mexico

Pandarinath

Verma²

2013

Journal of Iberian Geology

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Discrimination diagrams are being widely used for the past four decades to infer the tectonomagmatic affiliation of old rocks. There are several major-and trace-element composition based bivariate, ternary and multi-element discriminant function diagrams in the literature. Recent evaluation of the performance of these diagrams indicates that four sets of recent discriminant function based diagrams, in which the tectonic boundaries are determined from probability estimates for four tectonic settings of island arc, continental rift, ocean-island and mid-ocean ridge, have shown very high success rates. In this work, we have created an extensive geochemical database for on-land and off-shore basic rocks of northwest Mexico and applied these four sets of recent and highly successful tectonomagmatic discriminant function based diagrams to infer their tectonomagmatic origin. Each of these four sets of diagrams (two for major-and two for trace-elements) contained five diagrams. All the four sets of diagrams confirmed a continental rift setting for on-land basic rocks of <13 Ma age, with success rates of 71%-93% and 58%-90% for major-element and traceelement based diagrams, respectively. For the on-land basic rocks of >13 Ma age, major-element based diagrams also indicated a rift setting. However, one set of trace-element based discrimination diagrams indicated an arc to rift transition and the other set of trace-element based discrimination diagrams for the only sample from the Comondú arc, which has the required complete dataset, indicated an arc setting. All the four sets of discrimination diagrams indicated MORB setting (success rates 90%-98% and 100% for major-element and trace-element based diagrams, respectively) for off-shore rocks (most of the samples were obtained from DSDP drilled sites in the Gulf of California and some dredged rock samples from the Gulf of California) with very high success rates. All the inferred tectonic settings from these four sets of new discrimination diagrams, in general, are in conformity with those reported in the literature based on other methods. The results show that these discrimination diagrams may successfully discriminate the original tectonic setting of comparatively younger and older on-shore rocks as well as sea-water altered deep-sea rocks and dredged material.

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“…It coincides in time with the collision of the Pacific-Farallon ridge with the trench, and the end of subduction Stock and Hodges, 1989;Lonsdale, 1991]. The southern part of the oceanic ridge broke into small ridge segments that were progressively abandoned off Baja California [Michaud et al, 2006;Pallares et al, 2007]. Between 12.5 and 7 Ma, the Tosco-Abreojos fault system developed along Baja California to accommodate the relative motion of the Pacific plate [Spencer and Normark, 1979;Stock and Lee, 1994].…”

Section: Fig 4 -Diagramme Alcalins-silice (Tas) [Lementioning

confidence: 99%

Isotope geochemistry and petrogenesis of peralkaline Middle Miocene ignimbrites from central Sonora: relationship with continental break-up and the birth of the Gulf of California

Vidal-Solano

Lapierre

Stock

et al. 2008

Bulletin De La Société Géologique De France

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Abstract. -Middle Miocene peralkaline ignimbrites constitute a specific geodynamic marker of the early stage of opening of the Gulf of California, preserved either in central Sonora or the Puertecitos area, in Baja California. Very uniform ages (12-12.5 Ma) obtained on these rocks show that this volcanic episode corresponds to a specific stage in the tectonic evolution of the proto-gulf area. Field observations and slightly different Sr and Nd isotopic signatures support eruptions from several small volume magma batches rather than from a large-volume caldera forming event. Isotopic ratios help to constrain the petrogenesis of the peralkaline liquids by fractional crystallization of transitional basalts in a shallow reservoir, with slight contamination by Precambrian upper crustal material. Less differentiated glomeroporphyritic icelandites erupted at about 11 Ma, mark an increase in the magma production rate and highlight an easier access to the surface, illustrating an advanced stage in the weakening of the continental crust. The tilting of the Middle Tertiary sequences results from a major change in the tectonic regime, from E-W extension giving rise to N-S grabens, to NNW-SSE strike-slip motion that can be related to the transfer of Baja California from North America to the Pacific plate. The location of peralkaline volcanism coincides with the southern edge of the Precambrian crust and the southernmost extension of the California slab window at 12.5 Ma. Géochimie isotopique et pétrogenèse des ignimbrites hyperalcalines du Miocène moyen du Sonora central : relations avec la déchirure continentale et la naissance du golfe de CalifornieMots-clés. -Ignimbrites hyperalcalines, Miocène moyen, Géochimie isotopique, Golfe de Californie.Résumé. -Les ignimbrites hyperalcalines du Miocène moyen constituent un excellent marqueur du stade initial de l'ouverture du golfe de Californie. Elles sont préservées aussi bien en Sonora central que sur la marge orientale de la pénin-sule de Basse Californie, dans la région de Puertecitos. Les âges uniformes obtenus sur ces roches (12.5-12 Ma) montrent que cet épisode volcanique correspond à un stade spécifique de l'évolution du golfe de Californie. Les données de terrain, ainsi que les données isotopiques, indiquent que les ignimbrites correspondent à plusieurs venues de faibles volumes, plutôt qu'à une éruption majeure se terminant par un effondrement en caldera. Les données isotopiques permettent en outre de préciser que les ignimbrites sont le résultat de processus de cristallisation fractionnée à partir de basaltes transitionnels, avec une faible contamination par la croûte supérieure précambrienne. Les laves vitreuses gloméroporphyriques de 11 Ma (islandites) témoignent d'une production magmatique plus importante et d'un accès plus aisé vers la surface, en relation sans doute avec une croûte continentale plus amincie. Le basculement des séquences du Miocène moyen et supérieur témoigne d'un changement majeur du champ de contrainte, depuis une extension E-W à l'origine de grab...

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Slab-tearing following ridge-trench collision: Evidence from Miocene volcanism in Baja California, México

Cited by 111 publications

References 93 publications

Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Application of four sets of tectonomagmatic discriminant function based diagrams to basic rocks from northwest Mexico

Isotope geochemistry and petrogenesis of peralkaline Middle Miocene ignimbrites from central Sonora: relationship with continental break-up and the birth of the Gulf of California

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