Ads
related to: quartz granite replacementalternativebee.com has been visited by 10K+ users in the past month
doconsumer.com has been visited by 10K+ users in the past month
assistantking.com has been visited by 10K+ users in the past month
Search results
Results from the WOW.Com Content Network
The replacement reactions can affect large portions (> 60%) of the primary alkali feldspar. An important distinctive feature of this type of myrmekite formation is the constant thickness of the vermicules, whereas in the K-metasomatism their thickness changes as a function of the Ca-content of the plagioclase and they also taper towards the ...
The first of these is the ion-by-ion replacement in minerals, this can happen from the precipitation of new minerals at the same time as the dissolution of existing minerals. [6] The second feature used to identify metasomatism is that it is from the preservation of rocks in its solid state during replacement. [6]
A significant portion of silica appeared in the form of white chalcedonic quartz, quartz veins as well as granular quartz crystal. [22] Due to the difference in rock structures, silica replaces different materials in rocks of close locations. The following table shows the replacement of silica at different localities: [22]
Phyllic alteration typically forms in the base-metal zone of a porphyry system. [2] Alteration assemblages vary with depth and with degree of fluid interaction. In deep environments, the most highly altered areas are veins and thin selvages, or halos, that surround them.
Granite (light) with sheeted veins of greisen (dark) at Cligga Head, Cornwall. Greisen is a highly altered granitic rock or pegmatite, usually composed predominantly of quartz and micas (mostly muscovite). Greisen is formed by self-generated alteration of a granite and is a class of moderate- to high-temperature magmatic-hydrothermal alteration ...
There is some pseudomorphic replacement of spodumene by rose muscovite and quartz by cleavelandite. The core of the pegmatite, known as "spotted rock", which is relatively fine-grained spodumene, microcline, and quartz, with accompanying finer-grained albite, lithium-bearing muscovite, lepidolite, microlite, and tantalite. Much of the spodumene ...
Ads
related to: quartz granite replacementalternativebee.com has been visited by 10K+ users in the past month
doconsumer.com has been visited by 10K+ users in the past month
assistantking.com has been visited by 10K+ users in the past month