Low-grade metamorphism of the Brook Street Volcanics, D'Urville Island, New Zealand

Organic nitrogen chemistry during low-grade metamorphism

Most of the organic nitrogen (Norg) on Earth is disseminated in crustal sediments and rocks in the form of fossil nitrogen-containing organic matter. The chemical speciation of fossil Norg within the overall molecular structure of organic matter changes with time and heating during burial. Progressive thermal evolution of organic matter involves phases of enhanced elimination of Norg and ultima...

Geochemistry of the Knight Island Ophiolite and Chenega Island Volcanics, Prince William Sound, Alaska

The tectonic evolution of southern Alaska is defined by a long history of subduction, accretion, and coastwise transport of terranes along the North American margin (e.g. Plafker et al., 1994). Cowen (1982, 2003) and Haeussler et al. (2003) propose two competing hypotheses for the formation and transport history of the Mesozoic-Tertiary Chugach-Prince William terrane that extends for at least 2...

Sedimentology, Petrographic Variability, and Very-low-grade Metamorphism of the Champsaur Sandstone Alexander Frank Waibel

La faculte des sciences, sur le preavis de Messieurs M. VUAGNAT, professeur ordinaire (Departement de mineralogie) et W. WILDI, profes-seur ordinaire (Departement de geologie et paleontologie) codireeteurs de these, R. CHESSEX, professeur ordinaire (Departement de mineralo-gie), J. HUNZIKER, Professeur (Universite de Lausanne), C. KERKHOVE, professeur (Universite de Grenoble) et J. MARTINI, doc...

Isolated deep earthquakes beneath the North Island of New Zealand

Vegetation Mortality in the Kaimai Ranges, North Island, New Zealand!

Areas ofvegetation mortality have been recognized in the upland forests of the Kaimai Ranges, North Island, New Zealand. The mortality is not confined to any particular vegetation type, but occurs above a critical altitude that differs at different points along the ranges. The mortality is episodic and has occurred at intervals over a period of several hundred years, with severe droughts implic...