plutonic rock


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plutonic rock

[plü′tän·ik ′räk]
(geology)
A rock formed at considerable depth by crystallization of magma or by chemical alteration.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
(2) Ijolite refers to a series of plutonic rocks containing nepheline and 30-60% mafic minerals, generally clinopyroxene, and including titanite, apatite and sometimes andradite (Jackson, 1997).
The oldest plutonic rocks in the Central plutonic belt are foliated granites that generally yield Floian to Darriwilian (Early to Middle Ordovician) U-Pb (zircon) ages (Whalen 1993; Whalen et al.
In addition, it is found that extrusive rocks (e.g., basalt and dacite) have much higher [kappa] compared to plutonic rocks; hypabyssal and pyroclastic rocks have relatively lower [kappa] (Table 2).
Plutonic rock fragments and schist-slate fragments are present, especially towards the south and the top of the formation (AGE, BLA, SAN, ESP, VUR) (Figs.
Geology, petrology, and geochemistry of the Neoproterozoic volcano plutonic rock association of the Indian Shield extension in Pakistan.
The intermediate plutonic rock samples, although having similar total REE to the gabbroic sample (27-33 ppm, from 4 to 18 times the chondritic abundances), have fractionated REE patterns an enrichment of the LREE compared to the HREE ([[La/Yb].sub.N] = 2.69-3.71, Fig.
Two leucogranite salnples have [[delta].sup.2][H.sub.WR] values of-60 and -56[per thousand], whereas values are lower for other plutonic rock types (-78 to -61[per thousand]).
Plutonic rock geochemical and isotopic evidence for a transition from arc (ca.
Major and trace elements study signify one common primary magma source composition for the plutonic rocks of the Chilas complex.
(iii) The northern domain consists of subordinate 830 Ma old metavolcanic rocks of tholeitic and alkaline affinities, which are associated with metasediments known as the Poli series and widespread 630-660 Ma old calc-alkaline plutonic rocks known as orthogneisses, which result from a major crustal accretion episode.