Results 41 to 50 of about 5,077 (206)
Geological Journal, EarlyView.The rhyolitic ignimbrite and K‐feldspar granite porphyry from the Wangmushan mining district, northern Fujian yield ages of 173.8 ± 0.8 and 102.6 ± 0.4 Ma, respectively. Geochemical data, zircon trace elements, whole‐rock Sr–Nd–Pb isotope data, and zircon Hf isotopic compositions indicate that the rhyolitic ignimbrite originated from partial remelting ...
Wei Shaogang +7 more
wiley +1 more source
PT-conditions of deformation within the Palaeoproterozoic South Finland shear zone: Some geothermobarometric results [PDF]
Bulletin of the Geological Society of Finland, 2005 Four rock samples were collected from the crustal-scale South Finland shear zone in order to compare PT-conditions of deformation between gneissose and mylonitic rock types.
T. Torvela, H. Annersten
doaj +1 more source
Journal of Metamorphic Geology, EarlyView.ABSTRACT Zircon is a common, highly refractory accessory mineral found in sedimentary, igneous and metamorphic rocks that forms through various processes (e.g., magmatic, hydrothermal, metamorphic growth and recrystallization). Trace element compositions of detrital zircon have been widely applied to understanding tectonic processes and continental ...
Jarrod M. Burges +5 more
wiley +1 more source
Compositional Variation of Venusian Melts as A Function of Thermal Gradient and Protolith
, 2023 Average surface pressure and temperature conditions of 92 bars and 460 °C and thermal gradients in the range of 5-25 °C/km and up to 50 °C/km for specific cases on Venus suggest that the lower crust and upper mantle are exposed to conditions suitable for
Semprich, Julia, Filiberto, Justin
core +3 more sources
Earth, Planets and Space, 2018 In-situ permeability of the Median Tectonic Line (MTL) fault zone in Mie Prefecture, southwest Japan, was estimated using hydraulic tests and groundwater pressure observations in two boreholes. The screen depths in Holes 1 and 2 are located, respectively,
Norio Matsumoto, Norio Shigematsu
doaj +1 more source
P‐T Uncertainty in Subsolidus Metamorphic Systems: Sources, Patterns and Controls
Journal of Metamorphic Geology, EarlyView.ABSTRACT Phase equilibrium modelling of metamorphic rocks is subject to multiple, superimposed sources of uncertainty that affect pressure–temperature (P$$ P $$‐T$$ T $$) estimates, making it difficult to independently distinguish and evaluate the contribution of each source.
I. P. Cawood, T. Mackay‐Champion
wiley +1 more source
Geochimica Brasiliensis, 2020 The hematitic phyllite is a rock that occurs in the São João da Chapada and Sopa-Brumadinho formations of the southern Espinhaço range. Its origin is widely discussed in papers on Espinhaço, but there is no consensus on its protolith due to certain ...
Alexandre de Oliveira Chaves +1 more
doaj +1 more source
Xenoliths in meteorites: Insights into the dynamics of material exchange between asteroids
Meteoritics &Planetary Science, EarlyView.Abstract A minor fraction of meteorites contains xenoliths, that is, clasts that were formed on a different parent body than that of the host lithology. The occurrence of xenoliths is direct evidence for the exchange of material between asteroids, including exchanges between asteroids from the carbonaceous (CC) and non‐carbonaceous (NC) reservoirs ...
J. Gattacceca +17 more
wiley +1 more source
Petrogenesis of metabasalt rocks in the Bulfat complex, Kurdistan region, Iraqi Zagros Suture Zone [PDF]
Kirkuk Journal of Science, 2015 Metabasaltes are exposed in the Bulfat complex north of Qaladeza that is a part of the Northwestern Zagros Suture Zone (NZSZ).Petrographic and geochemical study of metabasaltes have been conducted in order to provide insights into the origin and ...
Sarmad A. Ali
doaj +1 more source
U–Pb Dating of Cambrian Magmatism in the Pinerolo‐Sanfront Unit, Dora‐Maira Massif (Western Alps)
Terra Nova, EarlyView.ABSTRACT The Pinerolo‐Sanfront Unit (PSU), the structurally lowest tectonic unit of the Dora‐Maira Massif (Western Alps), has been regarded as a monocyclic unit composed of Permo‐Carboniferous sediments and Permian granitoids that were metamorphosed during the Alpine orogeny.
Francesco De Cesari +6 more
wiley +1 more source