Isotopic and trace-element profiles across the New Britain island arc, PapuaNew Guinea

Article Abstract:

Rock samples collected from the New Britain island arc of Papua New Guinea were subjected totrace element and Lead-,Strontium-, and Neodynium-isotopic analyses. The samples were collected over a large range of depths extending to the Wadati-Benioff low velocity Zone (WBZ). Rock composition showed that the New Britain magmas contain a slab-derived component of altered oceanic crust composition whose effect in the isotope analysis decreases with increasing depth to the WBZ. These results also indicate that high frequency strength elements and rare earth element concentrations are proportional to the depth ofthe WBZ.

Papua New Guinea, Island arcs, Isotope geology

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Temporal geochemical evolution in oceanic intra-plate volcanics: a case study from the Marquesas (French Polynesia) and comparison with other hotspots

Article Abstract:

Correlative studies on the shield-building and post-shield volcanic phases of Marquesan volcanism indicated that mantle plumes and lithospheric interactions affected the geochemical evolution of the oceanic basalt suites. These interactions resulted in variations in isotopic and trace element distribution between the two volcanic phases. Furthermore, longer volcanic intervals in between phases led to more pronounced plume effects. This study showed that the temporal evolution in the region could be categorized into two types depending on the respective plumes involved.

Analysis, Rocks, Igneous, Igneous rocks, Marquesas Islands

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Implications of Quaternary volcanism at Cerro Tuzgle for crustal and mantle evolution of the Puna Plateau, Central Andes, Argentina

Article Abstract:

An analysis describing the development of the Tuzgle volcanic center is presented. The center formed along extensional Quaternary faults which lined up the east-central Puna Plateau, which is located around 275 km to the east of Andean Central Volcanic Zone. It is shown that Tuzgle and shoshonitic series magmas were generated under changing thermal conditions and complex stress system. These same conditions governed underlying mantle transition.

Argentina, Earth, Crust (Geology), Geology, Stratigraphic, Stratigraphy, Quaternary period

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