calc-silicate

calc-silicate

[′kalk ′sil·ə·kət]
(geology)
Referring to a metamorphic rock consisting mainly of calcite and calcium-bearing silicates.
References in periodicals archive ?
Regional assessment of Marble and calc-silicate rocks of Rajasthan.
This strong calc-silicate alteration, that includes garnet, has proven to be a good indicator of base metal mineralisation at Jervois, suggesting close proximity to mineralisation.
According to the company, although graphite has been identified locally in marbles, graphite is also hosted here in quartz, biotite/mica gneisses and in calc-silicate gneisses.
The ADD is a 100-300 m-thick mylonite zone of interlayered quartzite, marble, calc-silicate and leucogranites.
If the protolith is siliceous carbonate, then calc-silicate minerals will be part of the mineral paragenesis.
However, we have also found zeolites in various granitic pegmatites, nepheline syenitic pegmatites, fractured diabase dikes, calc-silicate gneisses and fenites in the same area, and in agpaitic rocks and calc-silicate skarns in the CMBBZ.
But impure marbles (containing silicate and calc-silicate minerals) can be challenging to slab and polish, especially if the impurities occur as patches rather than being finely disseminated.
The gold is localized in calc-silicate altered serpentinite and in sheared metabasalt near a fault contact between these rock types.
This zone consists of both a calc-silicate skarn system as well as chalcedonic and quartz veining with arsenopyrite and pyrhhotite in coarse clastic sediments.
The HHC forms the hanging wall of the Main Central Thrust (MCT) and incorporates pelitic, psammitic and quartzite sequences together with thin amphibolite and calc-silicate bands along with granitoids of various ages.
1962) state that apophyllite can occur in fissures in metamorphic rocks bordering granite, and in limestone or calc-silicate rock associated with calcite, sometimes as an alteration product of wollastonite.
Gold anomalies up to 1,400 ppb are also found in scheelite-bearing calc-silicate zones which can be followed intermittently for 3.