metamorphism

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Words related to metamorphism

change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances

References in periodicals archive ?
2003): Anomalous reverse zoning of saponite and corrensite caused by contact metamorphism and hydrotermal alteration of marly rocks associated with subvolcanic bodies.
We consider that infiltration may have been the dominant mechanism during contact metamorphism, with H2O-rich fluids from the crystallization of a granodiorite intrusion penetrating calcareous rocks in the contact aureole giving rise to a skarn-type mineralogy and the formation of Ti-clinohumite, discussed in detail below.
an open system rich in meteoric or magmatic fluids), temperature exceeded 600[degrees]C and where permeability was high during the peak conditions of contact metamorphism.
1987), based on oxygen and hydrogen isotope evidence for widespread element exchange between rock and fluid, revealed that basalts from the Skye Main Lava Series were locally affected by contact metamorphism associated with the intrusion of tertiary Cuillin Complex gabbros and Red Hills granites and hydrothermal alteration due to the convection system induced by such intrusions.
Hornfelses were formed due to contact metamorphism of the Proterozoic schists at the contact with Variscan granitoids intrusion (the Asturian phase).
These orebodies occur in contact zones between limestone and porphyritic felsic intrusive rocks, although there is little contact metamorphism present; the zone appears to have afforded channels for ore-bearing solutions.
These igneous bodies led to a contact metamorphism in the country rocks with the growth of biotite, cordierite and andalusite.
Ty-pe 3 alteration occurs mainly in the contact zone between the Huntington Mountain pluton and East Bay Hills Group, suggesting its development during contact metamorphism.
The focus of this paper is to study overprinting contact metamorphism related to a small calc-alkaline intrusion in low to medium grade regional metamorphic rocks and to model the thermal effects of pluton emplacement at depths of less than 12 km.
The calcite blebs were produced during the mobilization of calcium carbonate during contact metamorphism, and the subsequent recrystallization in what is now the pocket zone of the skarn.
While the complete profile of the eastern anticlinal limb has been preserved despite being affected by contact metamorphism (cordierite occurs to the west of Ceska Ves village as first Stankova, 1975), the southern anticlinal limb has been preserved only as separate blocks consisting of xenolith-bearing granite and tectonic blocks (at Vapenna and Skorosice).
It is interpreted as a contact metamorphism promoted by the intrusion of the trondhjemite plutons grouped in the Cachi Formation (Schon and Miller, 1990; Toselli, 1992; Mendez et al, 2006) or, alternatively, as a regional metamorphism linked to either crustal thinning in an extensional tectonic setting (Tubia et al, 2005, 2008) or to a convergent tectonic regime (Sola et al.
1996) noted that the grade of metamorphism is very low to low (lower greenschist facies at most), with localized higher grade areas related to contact metamorphism by late Neoproterozoic and Devonian plutons.
Not only are the minerals fascinating, but Crestmore's unique contact metamorphism and skarn geology are particularly well-exposed for study.
Ground reconnaissance of the permits has outlined zones of contact metamorphism with potential for skarn type gold mineralisation.