Results 131 to 140 of about 18,694 (284)
Archaeometry, EarlyView.Abstract This research represents the most extensive characterisation of Roman mosaic tesserae (tiles) from Aquileia, Italy, to date, examining 153 specimens. The study aimed to identify the lithotypes used in mosaics production through a multi‐analytical approach, which included colorimetric analysis, polarised light microscopy and scanning electron ...
Neva M. E. Stucchi +5 more
wiley +1 more source
Accessory minerals: a provenancing tool for steatite quarries
Archaeometry, EarlyView.Abstract Steatite has been a widely traded material across a range of archaeological contexts. Yet, challenges inherent to determining its provenance limits our understanding of the networks and mechanisms of its exchange. We present a robust new accessory mineral provenancing “fingerprint” method based their specific growth history.
Riia Chmielowski +2 more
wiley +1 more source
pH Threshold Impacts Chalcopyrite Bioleaching Dynamics for the Extreme Thermoacidophile Sulfurisphaera ohwakuensis. [PDF]
Biotechnol BioengChalcopyrite bioleaching by the extreme thermoacidophile, Sulfurisphaera ohwakuensis. ABSTRACT The extremely thermoacidophilic archaeon Sulfurisphaera ohwakuensis served as the basis for probing how initial pH (pHinitial) affects copper mobilization from chalcopyrite. Screening of small‐scale cultures (75 mL) at 75°C revealed that ~pH 3.0 was a maximal
Willard DJ +3 more
europepmc +2 more sources
Geostandards and Geoanalytical Research, EarlyView.Key Points A stoichiometric calibration method for dual‐energy computed tomography allows non‐destructive characterisation of materials. Different acquisition settings and three different scanners were tested, characterising three rocks of known composition. Comparison of measurement results reveals the key parameters to be considered to perform useful
Margherita Martini +7 more
wiley +1 more source
Determination of Oxygen in Some Minerals Using Pyrite [PDF]
, 1960 Iwaji Iwasaki +2 more
openalex +1 more source
A Cautionary Tale About Not ‘Joining the Dots’ to Infer Anticlockwise P$$ P $$‐T$$ T $$ Paths
Journal of Metamorphic Geology, EarlyView.ABSTRACT Uncertainty surrounds the cause and interpretation of anticlockwise pressure‐temperature (P$$ P $$–T$$ T $$) paths in metamorphic terranes. Here, we focus on the viability of a commonly proposed mechanism—magmatic heat transfer during thickening—using a case study of the Roineabhal terrane in Scotland, where such an anticlockwise P$$ P $$–T ...
Owen Weller, Joseph Benson, Alex Copley
wiley +1 more source
Phase Equilibria Analysis for Metacarbonate With Applications to Zoned Calc‐Silicate Aureoles
Journal of Metamorphic Geology, EarlyView.ABSTRACT Carbonate rocks react with infiltrating hydrothermal fluids to produce zoned calcsilicate assemblages in contact aureoles. Petrogenetic grids provide valuable insights into phase relations, metamorphic temperature (T) and the fluid composition (X) of the metacarbonate systems, as well as semi‐quantification of the prograde decarbonation at ...
Zhenhao Zhou, Xu Chu
wiley +1 more source
CO-BEARING MINERALS IN ORES FROM THE MEDNORUDYANSKOE MALACHITE DEPOSIT (CENTRAL URALS) [PDF]
Минералогия, 2016 Cobaltite, Co-bearing pyrite, chalcopyrite and wad in ores from the Mednorudyanskoe deposit are characterized. Reserves of cobalt (about 3 000 t) were mainly concentrated in the Co-bearing hypogene minerals: pyrite and chalcopyrite with syngenetic ...
V.I. Popova, V.A. Kotlyarov, V.A. Popov
doaj