Geology of the Ahuachapan Area, Western El Salvador, Central America

Authors

  • Joachim D. Meyer

Abstract

The Ahuachapan area lies in Western El Salvador between the town of Ahuachapan and the Guatemalan border. It is within an E-W trending graben which transgresses the entire republic and which is believed to have formed from the collapse of a geanticline at the end of the Pliocene. Quaternary volcanism along the margins and within the graben largely filled it with volcanic debris, consisting of flat-lying tuffs, agglomerates and lavas. The sequence in the area, beginning with the oldest, is: ancient agglomerate, laminar andesite, massive andesite, blue ignimbrite, gray agglomerate, lower brown tuff, pink ignimbrite, gray ignimbrite, pumice and upper brown tuff. The thickness of these rocks attains a maximum of 425 meters. The strata are disrupted by a number of northeast-trending normal faults. Volcanic activity is still in progress at various centers in the region.

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Published

2017-03-21

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Articles