Results 81 to 90 of about 326,163 (350)
, 2017 Aggregate type and mineralogy are critical factors that influence the engineering properties of concrete. Temperature variations result in internal volume changes could potentially cause a network of micro-cracks leading to a reduction in the concrete’s ...
J. An +3 more
semanticscholar +1 more source
Mechanisms of near‐normal sea water dolomitisation: Mesohaline‐reflux or syn‐depositional?
The Depositional Record, EarlyView.This study investigates the dolomitisation of the Eocene Dammam Formation on the Arabian Plate using petrographic, mineralogical, geochemical and isotopic analyses. The findings reveal two distinct dolomite types, formed primarily through normal‐to‐mesohaline sea water dolomitisation, challenging previous models such as sabkha‐meteoric mixing.
Misbahu Abdullahi +3 more
wiley +1 more source
MINERAL TRANSFORMATIONS OF HYALOCLASTITE DURING LITHOGENESIS IN MASSIVE SULFIDE BEARING REGIONS OF URALS [PDF]
Минералогия, 2015 The features of the submarine transformations from primary hyaloclastites to oxide-ferruginous rocks of the Urals massive sulfide deposits are identified. These processes are accompanied by formation of smectite and Si-Fe phases transformed into chlorite-
N.R. Ayupova +3 more
doaj
Characterization and evolution of the sediments of a Mediterranean coastal lagoon located next to a former mining area [PDF]
, 2015 Coastal lagoons are ecosystems that are relatively enclosed water bodies under the influence of both the terrestrial and themarine environment, being vulnerable to human impacts.
García Fernández, Gregorio +1 more
core +2 more sources
Advances and Opportunities in Ore Mineralogy
, 2017 The study of ore minerals is rapidly transforming due to an explosion of new micro- and nano-analytical technologies. These advanced microbeam techniques can expose the physical and chemical character of ore minerals at ever-better spatial resolution and
N. Cook +6 more
semanticscholar +1 more source
Sediment‐stressed reefs over the past 420 Myr
The Depositional Record, EarlyView.In order to fully elucidate the relationship between siliciclastic sedimentation and reef development, there needs to be a significant step change in how we record ancient and recent reefs. Only through the collection of constrained quantitative data, we can progress beyond the largely conjectural associations postulated for many ancient reefal systems.
Tanja Unger +4 more
wiley +1 more source
FAHLORES OF ORE FACIES OF THE YUBILEYNOE MASSIVE SULFIDE DEPOSIT (SOUTH URALS) [PDF]
Минералогия, 2018 The Ag-, Te-, Mn, Pb-bearing tennantite and minerals of the tennantite-tetrahedrite series are recognized in chalcopyrite-pyrite-sphalerite-talc-calcite smoker chimneys, bornite- and chalcopyrite-rich and quartz-carbonate-hematite diagenites and ...
A.S. Tseluyko +3 more
doaj
Infrared observations of asteroids from earth and space [PDF]
Infrared reflectances at wavelength between 1 and 4 micrometers are used for determining asteroid surface mineralogy, surface composition, diameters, and albedos.
Lebofsky, L. A. +2 more
core +1 more source
The Depositional Record, EarlyView.We present the first documentation of whitings in the Red Sea, observed in a lagoonal environment. These events are linked to cascading offshore dense waters that liberate trapped sea floor nutrients, triggering algal blooms and elevating alkalinity, which is buffered by direct CaCO3 precipitation—contributing to the accumulation of aragonite mud in ...
Manuel Ariza‐Fuentes +8 more
wiley +1 more source
NEW DATA ON PYROCHLORE OF ALKALI PEGMATITES AND ORE ZONES OF THE VISHNEVYE MOUNTAINS (SOUTHERN URALS) [PDF]
Минералогия, 2018 The minerals of the pyrochlore group are abundant in rocks of the Vishnevogorsk alkaline complex – miaskites, mica rocks, carbonatites, and their pegmatites. Several generations of pyrochlore can be found in complex pegmatite bodies.
V.I. Popova +3 more
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