The trace element and Sr-Nd-Pb isotope geochemistry of Juan Fernandez lavas reveal variable contributions from a high-3He/4He mantle plume
Published in Chemical Geology, 2018
Research about the enigmatic and heterogeneous mantle source of the Juan Fernandez Islands, SE Chile. Evidence of a well-mixed, but heterogeneous plume at Juan Fernández Islands. Lava samples from this small island group near Chile have puzzled geochemists since the 1980s. In the 1980s-early 1990s, mantle geochemists were beginning to construct the flavors of mantle endmembers that might be sampled by oceanic islands. Juan Fernández lavas exhibited an uncommon range of high and low-3He/4He signatures. Yet, they displayed near-constant 87Sr/86Sr and 143Nd/144Nd isotopes. Solving for two possible mixing components with high and low 3He/4He but unchanging Sr-Nd isotopes was not possible.
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