metamorphic rock


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metamorphic rock

[¦med·ə¦mȯr·fik ′räk]
(petrology)
A rock formed from preexisting solid rocks by mineralogical, structural, and chemical changes, in response to extreme changes in temperature, pressure, and shearing stress.

metamorphic rock

Rock which has been altered in appearance, density, and crystalline structure (and in some cases mineral composition) by high temperature and/or high pressure; e.g., slate is a metamorphic rock derived from shale.
References in periodicals archive ?
On the other hand, garnet porphyroblasts with sigmoidal inclusion trails are not a common feature of regional metamorphic rocks.
METAMORPHIC: Formed when heat and pressure change sedimentary, igneous, or other metamorphic rocks.
Metamorphic rocks are well known for their variable microstructure with respect to the degree of foliation.
These grains with constituent minerals showing straight to sutured contacts resembling "stretched quartz", indicate derivation from metamorphic rocks (Blatt, 1967).
A Tropeptic Haplorthox formed on metamorphic rock, with high Depreciation Index, was incubated for 3 months in the laboratory at field moisture content, with powdered basalt rock at a rate of 50 t/ha.
Sedimentary rock with heat and pressure forms metamorphic rock.
Gneiss and marble are two examples of metamorphic rock (Figure 2-4).
The metamorphic rocks (mica schist and impure quartzites) are a part of a roof pendant that has a north-south trend and is surrounded by granodiorite and quartz diorite.
We do not know whether it resides primarily in the flooded fractures of the park's metamorphic rock or only in the saturated overburden above the bedrock, or both.
They expected abalone aragonite to resemble the aragonite found in metamorphic rock in Aragon, Spain.
The study by Jalal and Ghosh (2012) showed that the meta-sedimentary and very low-grade metamorphic rock fragments were sourced to the Lesser Himalayan domain, whereas the medium- to high-grade metamorphic fragments were sourced to the Lesser Himalayan Crystalline.
The occurrence of some clasts of high-grade metamorphic rock stratigraphically below this interval may record the progressive emergence of the new source, prior to its effective blockage of former drainage.