Geochemie, Mineralogie, Petrologie: Recent submissions
Anzeige der Dokumente 76-100 von 567
-
Metabasic rocks from the Variscan Schwarzwald (SW Germany): metamorphic evolution and igneous protoliths
(International Journal of Earth Sciences, 2021-03-22)In the Variscan Schwarzwald metabasic rocks form small bodies included within anatectic plagioclase-biotite gneisses. Many metabasites first underwent an eclogite-facies metamorphism at about 2.0 GPa and 670–700 °C, resulting ... -
Compaction control on diagenesis and reservoir quality development in red bed sandstones: a case study of Permian Rotliegend sandstones
; ; (International Journal of Earth Sciences, 2021-04-22)
Authigenic minerals formed during diagenesis in conjunction with compaction by burial have long been known to lead to porosity-loss of sandstones, and a subsequent deterioration in reservoir quality. The diagenetic impact ... -
The mineralogic and isotopic fingerprint of equatorial carbonates: Kepulauan Seribu, Indonesia
; ; ; (International Journal of Earth Sciences, 2021-01-18)
Kepulauan Seribu is an isolated patch reef complex situated in the Java Sea (Indonesia) and is a typical example for a humid, equatorial carbonate system. We investigate the mineralogical and isotopic fingerprint of Panggang, ... -
Age and origin of groundwater resources in the Ararat Valley, Armenia: a baseline study applying hydrogeochemistry and environmental tracers
;; ; ; ; ; ; (Hydrogeology Journal, 2021-08-28)
Within the Ararat Valley (Armenia), a continuously growing water demand (for irrigation and fish farming) and a simultaneous decline in groundwater recharge (due to climate change) result in increasing stress on the local ... -
Trace element fractionation between biotite, allanite, and granitic melt
(Contributions to Mineralogy and Petrology, 2021-09-02)The partitioning of a large suite of trace elements between biotite and water-saturated granitic melt was measured at 2 kbar and 700—800 ˚C. To reach equilibrium and to grow biotite crystals large enough for analysis, runs ... -
Thermal stress, cooling-rate and fictive temperature of silicate melts
(Contributions to Mineralogy and Petrology, 2021-09-21)
The unknown cooling-rate history of natural silicate melts can be investigated using differential scanning heat capacity measurements together with the limiting fictive temperature analysis calculation. There are a range ... -
Influence of CO2 on the rheology of melts from the Colli Albani Volcanic District (Italy): foidite to phonolite
; (Contributions to Mineralogy and Petrology, 2021-10-15)
In this study, the influence of CO2 on the rheology of silica poor and K-rich melts from highly explosive eruptions from the Colli Albani Volcanic District (Italy) (CAVD) is measured for the first time. The ... -
Sub-arc mantle enrichment in the Sunda rear-arc inferred from HFSE systematics in high-K lavas from Java
; ; ; ; ; ; ; (Contributions to Mineralogy and Petrology, 2021-12-21)
Many terrestrial silicate reservoirs display a characteristic depletion in Nb, which has been explained in some studies by the presence of reservoirs on Earth with superchondritic Nb/Ta. As one classical example, K-rich ... -
The redox dependence of titanium isotope fractionation in synthetic Ti-rich lunar melts
; ; ; ; ; (Contributions to Mineralogy and Petrology, 2021-02-28)
Equilibria between Ti oxides and silicate melt lead to Ti isotope fractionation in terrestrial samples, with isotopically light Ti oxides and isotopically heavy coexisting melt. However, while Ti is mostly tetravalent in ... -
Effect of Compaction Banding on the Hydraulic Properties of Porous Rock - Part II: Constitutive Description and Numerical Simulations
; ; (Rock Mechanics and Rock Engineering, 2021-03-23)
In this paper the performance of a constitutive model for the description of the hydro mechanical behaviour of soft rock is evaluated with respect to the experimentally observed behaviour of Maastricht Calcarenite under ... -
Effect of Compaction Banding on the Hydraulic Properties of Porous Rock: Part I—Experimental Investigation
; ; ; (Rock Mechanics and Rock Engineering, 2021-03-23)
The mechanical behavior and the influence of compaction banding on the hydraulic properties in soft porous rocks were studied. The tested rock was Calcarenite Tuffeau de Maastricht. In the frame of experimental investigations, ... -
Contemporaneous opening of the Alpine Tethys in the Eastern and Western Alps: constraints from a Late Jurassic gabbro intrusion age in the Glockner Nappe, Tauern Window, Austria
; ; (International Journal of Earth Sciences, 2021-07-01)
Metabasic rocks of the ophiolitic sequences of the Glockner Nappe and Eclogite Zone in the south-central Tauern Window, Austria, reveal important insights into rifting and spreading of the Alpine Tethys. U–Pb dating of ... -
Evolution of diagenetic conditions and burial history in Buntsandstein Gp. fractured sandstones (Upper Rhine Graben) from in-situ δ18O of quartz and 40Ar/39Ar geochronology of K-feldspar overgrowths
; ; ; ; ; ; ; (International Journal of Earth Sciences, 2021-07-09)
In-situ δ18O measured in the quartz overgrowths help identify temperature and fluid origin variations responsible for cementation of the pore network (matrix and fracture) in the Buntsandstein Gp. sandstone reservoirs ... -
Implications for sedimentary transport processes in southwestern Africa: a combined zircon morphology and age study including extensive geochronology databases
; ; ; ; ; ; ; ; ; ; (International Journal of Earth Sciences, 2021-12-17)
Extensive morphological and age studies on more than 4600 detrital zircon grains recovered from modern sands of Namibia reveal complex mechanisms of sediment transport. These data are further supplemented by a zircon age ... -
Characterisation of an artesian groundwater system in the Valle de Iglesia in the Central Andes of Argentina
; ; ; ; (International Journal of Earth Sciences, 2021-06-04)
Despite its location in the “Arid Diagonal” of South America, the Valle de Iglesia contains a number of artesian springs, the most important of which are the Baños Pismanta thermal springs, which release water at ~ 45 °C. ... -
The Temperature and Composition of the Mantle Sources of Martian Basalts
; ; ; ; (Geophysical Research Letters, 2023-06-08)
Abstract The composition of basaltic melts in equilibrium with the mantle can be determined for ...
-
Phase‐Field Simulation of Texture Evolution in Magmatic Rocks
; ; (Journal of Geophysical Research: Solid Earth, 2023-05-24)
Abstract The tool of phase‐field modeling for the prediction of chemical as well as microstructural ...
-
Stable Carbon Isotope Signature of Methane Released From Phytoplankton
; ; ; ; ; ; ; ; ; ; (Geophysical Research Letters, 2023-06-20)
Abstract Aquatic ecosystems play an important role in global methane cycling and many field studies ...
-
A note on the wedge reversion antisymmetry operation and 51 types of physical quantities in arbitrary dimensions
(Acta Crystallographica Section A, 2023-06-05)The paper by Gopalan [
(2020). Acta Cryst. A76 , ... -
Upper limits of water contents in olivine and orthopyroxene of equilibrated chondrites and several achondrites
; ; (Meteoritics & Planetary Science, 2023-04-13)
Abstract Hydroxyl defects in nominally anhydrous minerals (NAMs) were potential carriers of water ...
-
POWTEX visits POWGEN
(Journal of Applied Crystallography, 2023-04-25)The high‐intensity time‐of‐flight (TOF) neutron diffractometer POWTEX for powder and texture analysis is currently being built prior to operation in the eastern ...
-
The composition of subduction zone fluids and the origin of the trace element enrichment in arc magmas
; ; (Contributions to Mineralogy and Petrology, 2021-06-15)
The partitioning of major and trace elements between eclogite and aqueous fluids with variable salinity was studied at 700–800 °C and 4–6 GPa in piston cylinder and multi anvil experiments. Fluid compositions were determined ... -
Two-phase late Paleozoic magmatism (~ 313–312 and ~ 299–298 Ma) in the Lusatian Block and its relation to large scale NW striking fault zones: evidence from zircon U–Pb CA–ID–TIMS geochronology, bulk rock- and zircon chemistry
; ; ; ; ; (International Journal of Earth Sciences, 2021-08-12)
Late Paleozoic (Variscan) magmatism is widespread in Central Europe. The Lusatian Block is located in the NE Bohemian Massif and it is part of the Saxothuringian Zone of the Variscan orogen. It is bordered by two major ... -
Combining reverse Monte Carlo analysis of X‐ray scattering and extended X‐ray absorption fine structure spectra of very small nanoparticles
(Journal of Applied Crystallography, 2022-12-23)Finite size effects in partial pair distribution functions generate artefacts in the scattering structure factor and scattering intensity. It is shown how they can be overcome using a binned version of the Debye scattering ... -
Use of electron backscatter diffraction patterns to determine the crystal lattice. Part 2. Offset corrections
(Journal of Applied Crystallography, 2023-02-24)A band width determination using the first derivative of the band profile systematically underestimates the true Bragg angle. Corrections are proposed to compensate for the resulting offset Δa/a of the mean lattice parameters ...
