Chapters authored
Modeling of Olivine and Clinopyroxene Fractionation in Intracontinental Alkaline Basalts: A Case Study from the Carpathian-Pannonian Region
Besides mantle peridotites primary basaltic melts are the best tool to investigate upper mantle petrology and geochemistry. However, de facto primitive melts are hard to found, as basaltic melts usually go through a fractionation process during their ascent towards the surface. Most primary melt calculators are based on the major or trace element compositions of olivine-phyric ocean island basalts and peridotites and are less accurate if clinopyroxene fractionation occurred. In this chapter a new fractionation modeling method of alkaline basalts will be introduced, which has been published earlier only in Hungarian. Olivine ± clinopyroxene fractionation of four basaltic volcanoes have been modeled from different Miocene-Quaternary volcanic fields from the Carpathian-Pannonian Region (Stiavnica (Selmec) VF, Novohrad-Gemer (Nógrád-Gömör) VF, Perşani Mts. (Persányi Mts.) VF and from the Lucaret-Sanoviţa (Lukácskő-Sziklás) volcano.
Part of the book: Updates in Volcanology
Why the Pounamu? Low- to Medium Grade Metabasites and Metaultrabasites of New Zealand from a Geoheritage Perspective
Pounamu plays a very important role in Māori culture (New Zealand) and is a taonga (treasure) of the people. Pounamu is a result of the intricate, unique geological context of the Zealandia microcontinent in the SW Pacific successfully separated from Gondwana in the Late Mesozoic but cut half in a NE-SWE trending right-lateral strike-slip dominated plate boundary separating the Indo-Australian and Pacific Plates within the continental lithospheric segment of Zealandia. Along this nearly 500 km onshore structural zone, a set of narrow Paleozoic to Mesozoic lithospheric terrains assembled among ophiolite belts such as the Dun Mountain Terrain. Metasomatic influence on the ancient seafloor in combination with high-grade regional metamorphic forces along the evolving plate boundaries, a globally unique region with high geodiversity formed, giving way to the assemblage of metamorphosed ultramafic bodies to generate great variety of greenstones, referred as pounamu by Māori. The perfect physicochemical conditions of this rock made it to become a key geomaterial for tool-making and trade subjects within the Māori culture.
Part of the book: Metamorphic Rocks as the Key to Understanding Geodynamic Processes [Working title]