Glazes of a jade green tone (also called plum green, or kingfisher green) were a feature of the Longquan kilns, which appear to have used a glaze mixture of a sericitic
porcelain stone with some red clay.
, argillic (advanced, intermediate and weak), silicic, chloritic, propyltic, zeolitic and alunite alteration zones have been recognized along this axis.
Terry Peacock, which assayed 87 g/mt, in a similar sericitic
schist as Hemlo, where more than 20 million oz were found.
In these rocks occurring different alteration processes such as serpentine, epidotite, siliceous, sericitic
, zeolite, chlorite, carbonate, and iron oxides.
Many of these clasts are also clearly phyllitic with sericitic
The mineralization consists of vuggy quartz veins and breccias in granite with strong sericitic
and local tourmaline alteration.
Subsequent hydrothermal carbonate alteration imparts additional variability and creates a range of sericitic
schistose rocks containing varying abundances of carbonate, chlorite and pyrite, and producing a wide array of weathering colours.
The porphyry stocks consist of 2-ram to 5-mm quartz, feldspar and biotite phenocrysts in quartz and orthoclase, overprinted by strong sericitic
The main rock types are slates, quartzites, conglomerates, and sericitic
and chloritic phyllites and schist, with some interbedded calc-silicate rocks (Martin-Izard et al.
The Bayan-uul porphyry copper prospect is dominated by pyrite-rich sericitic
and quartz-tourmaline alteration representing a shallow erosion level[8,10], and Erdenetlin-ovoo is also considered to be exposed relatively shallowly.
At Cerro Oro gold-silver mineralization is hosted in sericitic
and argillically altered 2-3MA volcanic tuffs and flows of the Combia Formation associated with extensive multidirectional hematitic fractures zones.
A well established alteration-mineralization potassic zoning sequence may be evident within a single deposit, ranging from a central, orthoclase and/or biotite core, sericite as fracture-controlled and pervasive replacements, outwards through successive phyllic, sericitic
, argillic and propylitic areas Although phyllic areas may contain less bulk potassium gain than potassic cores, their peripheral distribution usually offers much larger targets for gamma ray spectrometry detection A number of potassium anomalies are directly associated with intermediate intrusive bodies and their associated alteration systems within porphyry copper belts.