Fluid source, element mobility and physicochemical conditions of porphyry-style hydrothermal alteration-mineralization at Mirkhani, southern Chitral, Pakistan

2021 ◽  
pp. 104222
Author(s):  
Muhammad Farhan ◽  
Mohammad Arif ◽  
Ye Ying ◽  
Xuegang Chen ◽  
Dieter Garbe-Schönberg ◽  
...  
Keyword(s):  
Hydrothermal Alteration ◽  
Element Mobility ◽  
Fluid Source ◽  
Physicochemical Conditions

Element mobility during the hydrothermal alteration of rhyolitic rocks of the Los Azufres geothermal field, Mexico

Geothermics ◽  
2008 ◽  
Vol 37 (1) ◽  
pp. 53-72 ◽  
Author(s):  
Kailasa Pandarinath ◽  
Peter Dulski ◽  
Ignacio S. Torres-Alvarado ◽  
Surendra P. Verma
Keyword(s):  
Hydrothermal Alteration ◽  
Geothermal Field ◽  
Element Mobility

Behaviour of ThSiO4 during hydrothermal alteration of raremetal rich lithologies from peralkaline rocks

2017 ◽  
Vol 81 (4) ◽  
pp. 873-893 ◽  
Author(s):  
R. Macdonald ◽  
B. Bagiński ◽  
P. M. Kartashov ◽  
D. Zozulya
Keyword(s):  
Low Temperature ◽  
Hydrothermal Alteration ◽  
Late Stage ◽  
Great Majority ◽  
Hydrothermal Fluids ◽  
Element Mobility ◽  
Limited Mobility ◽  
Fluid Infiltration ◽  
Geochemical Indicators ◽  
Structural Formulae

AbstractThe behaviour of ThSiO4 during low-temperature alteration has significance for element mobility and redistribution. Here we describe five types of alteration of ThSiO4 by hydrothermal fluids: (1) primary ThSiO4 associated with chevkinite-(Ce) in a quartz-epidote metasomatite; (2) during alteration of monazite-(Ce) in a quartzolite; (3) during alteration of fergusonite-(Y) in a quartz-epidote metasomatite; (4) following exsolution from chevkinite-(Ce); and (5) associated with cerite-(Ce) and with ilmenite and bastnäsite-(Ce) in late-stage veinlets in a syenitic pegmatite and a metasomatite. The great majority of crystals have been strongly altered compositionally, with variable degrees of replacement of formula elements by non-formula elements, such as Ca, Fe, P and REE. The most reliable geochemical indicators of hydrothermal alteration are low analytical totals and non-stoichiometric structural formulae. The alteration is variably ascribed to dissolution-reprecipitation and pervasive fluid infiltration along cracks. Thorium appears to have shown limited mobility in these samples.

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