Results 41 to 50 of about 1,312 (211)
Meteoritics &Planetary Science, EarlyView.Abstract We report the discovery of the second (Al,Cu)‐alloy–bearing micrometeorite, FB‐A2, recovered from Mount Gariglione (southern Italy), representing the sixth such occurrence worldwide. Although chondritic in nature, FB‐A2 differs markedly from previously described microspherules.
Giovanna Agrosì +6 more
wiley +1 more source
Quantifying element mass transfer in the Jiling Na-metasomatic hydrothermal uranium deposit, Northwest China [PDF]
The Na-metasomatic hydrothermal uranium deposits are relatively widespread, low in grade (less than 1 % U3O8) but high in tonnage. Although it has been considered that this type of deposit was formed due to hydrothermal alteration unrelated to magmatic ...
Shao, Dong +5 more
core +1 more source
Solid Earth SciencesThe Michni area within the Warsak complex that is part of the Peshawar plain alkaline igneous province (PPAIP) in NW Pakistan, hosts a diverse suite of alkaline and carbonatitic rocks whose origin and evolution remain poorly constrained.
Muhammad Jawad Zeb +4 more
doaj +1 more source
Journal of Economic Geology, 2023 Macroscopic, microscopic and geochemical studies carried out on albite-bearing metasomatites and metasomatic rhyolites hosting the magnetite-apatite deposit of Chogharat indicate the presence of three generations of albite with different concentrations ...
Kiamars Hosseini +2 more
doaj +1 more source
8. METASOMATIC AND METAMORPHIC PECULIARITIES OF THE DIABASE DIKE ALTERATION IN HOLE 504B, LEG 140 [PDF]
, 1996 The diabase dikes recovered during Leg 140 display four types of mineralogical alteration: (1) chlorite + amphibole + titanite; (2) chlorite + amphibole + ilmenite; (3) epidote + prehnite + anhydrite; (4) zeolites + smectite.
J C Alt +3 more
core
A specialized topaz-bearing rapakivi granite and associated mineralized greisen in the Ahvenisto complex, SE Finland [PDF]
Bulletin of the Geological Society of Finland, 1991 The Ahvenisto rapakivi complex is a satellite northwest of the large Wiborg rapakivi batholith in Southeastern Finland. The rapakivi rocks are surrounded by rapakivi-age gabbros, anorthosites, monzodiorites and diabases.
P. Edén
doaj +1 more source
Progressive albitisation in the "Migmatite Creek" region, Weekeroo Inlier, Curnamona. [PDF]
, 2009 Albitisation is pervasive and intense in the Curnamona Province. Most FeO-Cu-Au-U-REE deposits are associated with sodic alteration or albitisation (alkaline alteration) worldwide.
Yang, Cheng Lin
core
Post-magmatic alteration in eudialyte from the North Qoroq centre, South Greenland [PDF]
, 1997 The North Qoroq centre comprises a series of nested nepheline syenite intrusions and forms part of the midlate Proterozoic Gardar province of South Greenland. Within the centre fractionation has produced varied rock types ranging from augite-syenite to
Coulson, Ian
core +1 more source
BANALSITE–STRONALSITE FROM SANDYITES OF THE ILMENOGORSKY MIASKITE MASSIF (SOUTH URAL) [PDF]
Минералогия, 2016 The minerals of the banalsite BaNa2(Al2Si2O8 )2–SrNa2(Al2Si2O8) stronalsite series were found for the first time in alkaline rocks of the Ilmenogorsky miaskite massif. Banalsite contains 11.97– 12.86 wt. % ВаO and 5.44–5.56 wt. % SrO.
E.V. Medvedeva +2 more
doaj
MINERALOGICAL, GEOCHEMICAL AND RADIOACTIVE ASPECTS OF NUWEIBI BASEMENT ROCKS, CENTRAL EASTERN DESERT, EGYPT [PDF]
Delta Journal of Science, 2010 Nuweibi area is situated in the Central Eastern Desert, Egypt, covers an area of about 135km2. The field observations and the detailed petrographic study revealed that the mapped area is distinguished into several rock units: serpentinites, metasediments,
Sameh M. Mansour +2 more
doaj +1 more source