Abstract
The formation of beach ridges along the Caribbean Coast of Costa Rica, ranging in age between about 100 and 5000 years, appears to be related to discontinuous sand supply by volcanic eruptions in the Costa Rican Central Cordillera. This is indicated by consistent and statistical significant differences in chemical composition between sediments of individual beach ridges, which cannot be explained by textural differences. The differences are thought to be caused by variations in magma composition of different eruptions in the volcanic hinterland. SiO 2 contents of the ridges vary between about 52% and 59%, other elements show variations corresponding to magmatic differentiation. Petrographically this is expressed in variations in the amount of andesitic rock fragments and pyroxene grains. Chemical composition of beach ridge sediments is alike in composition to the erupted products. However, in spite of the removal of part of the mobile elements and mixing with weathered sediments, original differences between the erupted products appear to remain reflected in the resulting beach ridge sediments.
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