Morokweng is a large, 145 Ma impact structure in the Northwest Province of South Africa. The impact origin of this structure and its melt rock has been confirmed by ample evidence of shock metamorphism in clasts within the melt rock and samples from granitoid basement below the melt body. The age of this structure is indistinguishable from the biostratigraphic age of the Jurassic-Cretaceous (J-...

Chemical weathering indices are commonly used for characterizing weathering profiles by incorporating bulk major element oxide chemishy inlo a single metric for each sample. Generally, on homogeneous parent rocks, weathering indices change systematically with depth. However, the weathering of heterogeneous metamorphic rocks confounds the relationship between weathering index and depth. In this ...

Ten road cut samples collected from five lithological sections of Lokoja sandstone formation in the Middle Niger basin were investigated using integrated granulometric, petrographic and geochemical analyses. Results of grain size analysis; standard deviation and skewness which ranges from 0.08 to -0.05 and 0.59 to -0.07 respectively suggest very well sorted to moderately well sorted sediments. ...

Isotopic data were collected on lower crustal xenoliths to constrain the Mexican lower crust as source material for the mid-Tertiary Sierra Madre Occidental, which is one of the largest silicic volcanic piles known. The xenoliths are predominantly pelitic gneisses and marie orthogneisses that were brought to the surface on the eastern edge of the Sierra Madre Occidental by recent alkalic basalt...

Abstract Magnetite is a common mineral in the Paleoproterozoic Stollberg Zn–Pb–Ag plus magnetite ore field (~6.6 Mt of production), which occurs 1.9 Ga metamorphosed felsic and mafic rocks. Mineralisation at consists bodies massive to semi-massive sphalerite–galena pyrrhotite (with subordinate pyrite, chalcopyrite, arsenopyrite magnetite) hosted by metavolcanic rocks skarn. sulfides, skarn, amp...

The article considers the geological features and ore composition of Dyusembay Central (Sayakhat) leadzinc deposit in Karsakpai metallogenic complex Kazakhstan. Historically, was considered industrially significant terms iron ores, rather than lead, zinc, copper. It is shown that composed tuffaceous, silty-sandstone, carbonaceous-terrigenous (ore-hosting), terrigenous, volcanogenic rocks assign...

Abstract Partial melting during high-temperature to ultrahigh-temperature (UHT) metamorphism facilitates crustal differentiation, element transfer, and the evolution of topography in orogens, however mechanisms that drive heating Earth’s crust remain controversial. We provide new evidence from ca. 2.3 Ma dacites Tibetan Plateau, representing youngest known UHT metamorphic event. Our results sho...

To further explore the uranium-bearing prospects of Zhiluo Formation, petrography, major elements, trace elements and rare earth sandstone samples collected from four boreholes were analyzed in this research to determine provenance, tectonic setting paleoweathering formation. The results analysis reveal that Formation comprises primarily feldspar sandstone, with quartz, feldspar, mica as main m...