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Geochemistry of the extensive peralkaline pyroclastic flow deposit of NW Mexico, based on conventional and handheld X-ray fluorescence. Implications in a regional context

Vidal-Solano, J. R. and Lozano Santa Cruz, R. and Zamora, O. and Mendoza-Cordova, A. and Stock, J. M. (2013) Geochemistry of the extensive peralkaline pyroclastic flow deposit of NW Mexico, based on conventional and handheld X-ray fluorescence. Implications in a regional context. Journal of Iberian Geology, 39 (1). pp. 121-130. ISSN 1698-6180. doi:10.5209/rev_JIGE.2013.v39.n1.41754.

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Chemical analyses conducted on the surface of rock slabs under a combination of two X-ray spectrometry methods, wavelength dispersive XRF and energy dispersive XRF, are used to establish a geochemical correlation between the studied samples. This proves to be an excellent method for the characterization of volcanic glasses, particularly when particles of exotic origin are present, because the effect of these is not easily eliminated by conventional whole rock analysis. Analyses of glassy rhyolites (ignimbrites and lava flows) in northwestern Mexico establish a geochemical signature for the samples, providing criteria that allow us to: a) correlate them with a peralkaline volcanic event, previously reported, that occurred during Middle Miocene time; b) distinguish them from other metaluminous varieties in the region and, c) propose a correlation between all the peralkaline vitrophyres that crop out within the studied area, of at least 50.000 km^2, validating the hypothesis that they are related to the same volcanic event. Finally, based on the results of this study and previous geological investigations, it is proposed that a distance of more than 100 km between the geographical location of the thickest peralkaline deposits in Sonora, is probably related to a displacement along transtensional dextral faults during the Late Miocene.

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Stock, J. M.0000-0003-4816-7865
Additional Information:© 2013 Universidad Complutense de Madrid. Received: April 26, 2011; Accepted: April 12, 2013. This work was supported by a Research Grant #061198 from Consejo Nacional de Ciencia y Tecnología (CONACYT) to Jesús Roberto Vidal Solano. Thanks to Sheila A. Corrales (Departamento de Geología de la Universidad de Sonora) for thin-section and rock slab preparation. J. Stock’s participation was supported by the US National Science Foundation grant EAR-0911761. The authors wish to thank reviewers Dr. Takeshi Kuritani and Dr. Manoj. K. Pandit for valuable comments that have enriched this work. Likewise, the detailed and careful comments of Dr. Alain Demant are greatly appreciated.
Group:Seismological Laboratory
Funding AgencyGrant Number
CONACyT (Mexico)061198
Issue or Number:1
Record Number:CaltechAUTHORS:20131220-135844497
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Official Citation:VIDAL-SOLANO, J., LOZANO SANTA CRUZ, R., ZAMORA, O., MENDOZA-CORDOVA, A., STOCK, J.. Geochemical characteristics of the extensive peralkaline pyroclastic flow deposit of NW Mexico based on conventional and handheld X-ray fluorescence. Geochemical and tectonic implications in a regional context.. Journal of Iberian Geology, North America, 39, apr. 2013. Available at: <>.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43122
Deposited On:23 Dec 2013 19:51
Last Modified:10 Nov 2021 16:33

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