Water concentrations and hydrogen isotope compositions of alkaline basalt-hosted clinopyroxene megacrysts and amphibole clinopyroxenites: the role of structural hydroxyl groups and molecular water

The Lithospheric Thickness Control on the Compositional Variation of Continental Intraplate Basalts: A Demonstration Using the Cenozoic Basalts and Clinopyroxene Megacrysts From Eastern China

“…Calculated equilibrium temperatures and pressures of cpx megacrysts in P–T space and histogram of the calculated crystallization depths of these cpx megacrysts. The data include 47 cpx megacrysts of this study and 46 cpx megacrysts from the literature (Chen et al, 2009; Han et al, 1991; Kovács et al, 2016; Liu et al, 1992; Su et al, 2014; Wang, 2011; Xia et al, 2004; Yu et al, 2019). The cpx barometer and thermometer used are eq.32a/32d in Putirka (2008).…”

2H/1H measurements of amphiboles and nominally anhydrous minerals (clinopyroxene, garnet and diamond) using high-temperature continuous flow elemental analyser/pyrolysis/isotope ratio mass spectrometry

“…In a second set of experiments we measured the 2 H/ 1 H ratios of hydroxylated (amphibole) and nominally anhydrous silicates (clinopyroxene and garnet). Data for clinopyroxenes were published in Kovacs et al The hydrogen concentrations in clinopyroxenes are of the order of hundreds of ppm. Consequently, the sample weights were in the range of 40–50 mg although the size limitation was not the capacity of the reactor but the geometry of the carrousel.…”

“…The Elemental Analyser in Pyrolysis mode connected on‐line in Continuous Flow mode to a mass spectrometer performing Isotope Ratio Mass Spectrometry (CF‐EA‐Py‐IRMS) has been optimised to enhance pyrolysis yields, and this system has been previously tested for alkaline basalt‐hosted clinopyroxenes and amphibole pyroxenites. An explanation for the origin of pyroxenes and amphiboles, with the exception of the Tobaj locality, is given in Kovács et al Tobaj is located in the Styrian Basin where Plio‐Pleistocene volcanic activity brought a great variety of xenoliths and phenocrysts to the surface. The studied amphiboles originate from euhedral grains from basaltic tuffs in the vicinity of Tobaj described in Bojar et al We also performed 2 H/ 1 H measurements on four diamond samples: three of them are gem diamonds of which one (V913) is a diamondite from the Venetia kimberlite pipe in South Africa described in Jacob et al, as well as two garnet crystals (G1 split into 2 samples, the rim (G1B ≈ 5 g) and the core (G1C ≈ 1.5 g), and G2RT with a bulk weight ≈ 5 g).…”

A földköpeny reológiai kutatása: mennyiségi Fourier transzformációs infravörös spektrometria alkalmazása egy Persány hegységi xenolit példáján

“…A Nógrád-Gömör;KOVÁCS et al 2016) származó felsőköpeny xenolit víztartalmához képest. A "vízgazdagság" a peremi területekre jellemző, szubkontinentális litoszferikus köpenyben számottevő mennyiségben jelenlévő, szerkezeti vizet tartalmazó ásványokon (pargasit, flogopit, apatit) túl a NAM elegyrészek vízgazdagságának is tulajdonítható (ARADI et al 2017.…”