WebAug 1, 2016 · The chemical composition of phlogopite, tourmaline, and illite from altered rocks of the Nistru Cu-Au-Bi deposit has been examined. Phlogopite of potassic alteration … WebThe chemical compositions of white micas separated from adjacent rocks of glaucophane and greenschist facies are compared with respect to their Si +4 content. The micas are predominantly phengitic, i.e. between muscovite, K [Al 2 Si 3 AlO 10 (OH) 2] and celadonite, K [ (R +2 R +3 )Si 4 O 10 (OH) 2] in composition.
Phengite micas; synthesis, stability, and natural occurrence
WebJul 28, 2024 · The Ti content in chlorite has a clear positive correlation with temperature [ 9, 40, 71 ]. Titanium, which belongs to HFSEs, does not easily migrate in hydrothermal fluids, … WebPashley (1981b) reported two types of behavior for the interaction of muscovite mica surfaces in alkali metal chlorides: 1. Below a critical concentration (e. g., about 1 × 10 − 2 M NaCl and 5 × 10 − 4 M CsCl), which was different for each cation, the DLVO theory was followed from large distances of separation (1000 Å), with surface potentials in the range … bungalows for sale in wicklow ireland
Field Characterization of White Micas Using the ASD TerraSpec® …
WebJun 1, 2000 · Dans la phengite, la couche octaédrique est plus large comparéeà celle de la muscovite et la répulsion engendrée par le rapprochement des oxygènes en réponseà la pression est plus faible que dans... WebFeb 20, 2024 · The chlorite geothermometers give a T range of 150 to 400 °C, and the b parameter of 2M 1 micas (8.992–9.029 Å) indicates low to intermediate pressure regional metamorphism (1–3 kbar) although the wide range of phengitic substitution in micas and the 3T polytype suggest a wider pressure range in coherence with the clockwise PTt … Webless marked phengitic composition to dioctahedral potassic mica; and (2) this muscovite crystallizes as 2M 1, notwithstanding its phengitic composition. The samples (157 in number) are from widespread provenances. We conclude that the growth of 3T polytype of muscovite is not a function of mica composition. half shaved hair images