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1
Hydrothermal Processes and Mineral Systems
In this chapter I examine the main features of greisenisation processes, and the
main mineralogical and geochemical attributes of greisen systems. A number of
greisen-related mineral deposits are discussed here. These include the deposits
...
2
Metasomatism and the Chemical Transformation of Rock: The ...
In general, greisen alteration is usually preceded by Na metasomatism (albitite),
during which H+ ions are produced, which then initiate the process of
greisenisation. This involves the destabilisation and destruction of feldspars and
biotites to ...
3
New Zealand Journal of Geology and Geophysics
The physicochemi- cal processes involved during greisenisation are still not
entirely understood, but it is generally accepted that they entail a range of
pneumatolitic to hydro thermal activities, with accompanying introduction of
elements such ...
4
New Zealand Journal of Geology and Geophysics
After their emplacement, however, postmagmatic alteration took place, perhaps
in response to tectonism (see below), producing a series of mineralogical and
geochemical changes (greisenisation), and also locally introducing
mineralisation.
5
Geological Survey Bulletin
Significant tin mineralisation roughly overlaps the limit of greisenisation, and is
associated with minor molybdenite, chalcopyrite and fluorite. The main deposit of
this type is at the Anchor mine [59/845190] and other deposits include the Crystal
...
6
The Field Description of Igneous Rocks
... in which quartz overgrowths and replacements of existing minerals occurs; 2.
kaolinisation, or argillic alteration – the alteration of feldspar to clay minerals; 3.
greisenisation – the alteration to alkali feldspar to secondary white mica, sericite;
...
Dougal Jerram, Nick Petford, 2011
Greisenisation in the Granite of Cligga Head, Cornwall by ANTHONY HALL
Received 29 April 1970; taken as read 7 May 1971 CONTENTS 1. Introduction
page 209 2. The Chemical Composition of the Rocks 212 (a) Major Constituents
212 ...
8
Hydrothermal mineral deposits: principles and fundamental ...
(1988). In this chapter we examine the main features of greisenisation processes,
and the main mineralogical and geochemical attributes of greisen systems. In the
final section a number of greisen-related mineral deposits are discussed.
9
Geology, mineralogy, geochemistry and hydrothermal ...
Greisenisation is known to be genetically linked with other metasomatic
processes like silicification, tourmalinisation, fluoritisation, sericitisation and
chloritisation (Taylor 1979; Stemprok 1987). The most important greisen-type tin
deposits ...
M. Diehl, Geological Survey (Namibia), 1990
10
Geology of the Ballater district: memoir for 1:50 000 ...
Griesens Patches of green fine-grained mica, mostly less than 1 cm in size and
representing an incipient stage of pneumatolytic alteration (greisenisation) are
developed sporadically within the western arm of the Coilacriech Granite to the ...
Charles Gordon Smith, S. Goodman, Steve Robertson, 2002
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «GREISENISATION»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
greisenisation w wiadomościach.
Monto Minerals' rock chips reveal 6.97% tin at Mount Misery
Tin mineralisation largely associated with both greisenisation and selvages of quartz veins was identified in the area. The rock chip which ... «Proactive Investors Australia, Gru 12»
