Structural and temporal evolution of the Hawaiian plume: Constraints from noble gases in surface samples and the HSDP drill core

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Ocean Island Basalts (OIBs) produced by intraplate volcanoes such as e.g. the Hawaiian ones are often geochemically characterized by variable isotopic signatures due to sampling of different mantle reservoirs. These variations can occur over short distances on a very local scale. The aim of the Hawaii Scientific Drilling Project (HSDP) was to investigate the chemical and isotopic heterogeneity of a single volcano, Mauna Kea, to better constrain the temporal evolution of the Hawaiian mantle plume. In addition to this we are interested to study the Hawaiian mantle plume in time and space. Thus we propose to investigate the spatial structure of the Hawaiian plume using noble gas isotopes of samples from several volcanoes of the “Kea chain”. Noble gas data, especially Ne data, from the Kea trend volcanoes are scarce. Those data have not only the great potential for resolving different geochemical reservoirs but also to deduce mantle dynamic and magmatic processes being involved in melt generation and evolution.