Geologic and Tectonic Development of the Caribbean Plate Boundary in Southern Central America

Geochemical constraints on subduction processes in the Central American Volcanic Arc: Implications of boron geochemistry
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Published:January 01, 1995
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CiteCitation
William P. Leeman, Michael J. Carr, 1995. "Geochemical constraints on subduction processes in the Central American Volcanic Arc: Implications of boron geochemistry", Geologic and Tectonic Development of the Caribbean Plate Boundary in Southern Central America, Paul Mann
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Boron contents were measured in predominantly mafic Quaternary lavas from the Central American Volcanic Arc to evaluate along-strike variations in subduction processes. Despite the significant range in B concentrations (∼2 to 46 ppm), B/La ratios vary in a systematic fashion along the arc: Higher values (>1) are typical between Guatemala and northern Costa Rica, whereas low values (most <0.5) typify central Costa Rica and western Panama. Because B/La is highly correlated with 10Be/Be (r2 = 0.94, excluding one sample), B/La may be a useful indicator of subduction contributions to the magma sources. If enrichments of both B and...
- alkaline earth metals
- basalts
- Be-10/Be-9
- beryllium
- boron
- Cenozoic
- Central America
- geochemistry
- igneous rocks
- island arcs
- isotope ratios
- isotopes
- lanthanum
- lava
- lithosphere
- mafic composition
- mantle
- melting
- metals
- metasomatism
- Nd-144/Nd-143
- neodymium
- Nicaragua
- ocean-island basalts
- Panama
- plate tectonics
- processes
- Quaternary
- radioactive isotopes
- rare earths
- stable isotopes
- subduction
- subduction zones
- thermal properties
- trace elements
- variations
- volcanic rocks
- volcanoes
- volcanology
- western Panama
- western Nicaragua