Regional tephro-stratigraphic correlation in the Ecuadorian coastal region

Abstract:

In continental Ecuador about 30 volcanoes are considered potentially active (Barberi et al., 1991; Hall and Beate, 1991). Most of them have produced eruptions during the Holocene, some in the range of VEI= 4 to 6. Plinian and co-plinian ash sequences related to these eruptions are found in abundance in sedimentary layers in the litoral zone, the product of direct aerial fall and via minimal water transport in local streams. This study is creating a regional correlation of the ash sequences that we have collected from distinct sites between northern Esmeraldas to southern Manabí. Ash and mineralological characteristics of each layer are being determined by examination under binolcular microscope. Granulometric, chemical and radiocarbon analises are in progress. Based on the results, and by comparing these distal ash samples with the character of known eruptive products in the Sierra, parent volcanoes will be …

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