Igneous intrusions in coal-bearing sequences

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · Int. Geol. Rev.; (United States)

DOI:https://doi.org/10.1080/00206818709466190· OSTI ID:7230359

Gurevich, A B; Shishlov, S B

Intrusions of various compositions, sizes, and shapes have been observed in 115 out of 620 coal basins or deposits on all the continents. They are mainly subvolcanic and hypabyssal, with depths of emplacement estimated as ranging from a few hundred meters to 6 km, but usually 3-4 km. Compositionally, 42% are basic, 31% intermediate, 23% acid, and 4% ultrabasic. Mafic (and related) rock types include dolerites, trachydolerites, gabbro-dolerites, gabbro-monzonites, monzonites, diabases, gabbrodiabases, and less often gabbros and basalts (subvolcanic bodies). These mafic intrusions occur in coal formations of various ages from Carboniferous through Neogene, but predominate in Paleozoic (47%) and Cenozoic beds (45%). They also occur in coal formations of all genetic types, apart from those on ancient stable platforms, where there are no signs of intrusive activity. The mafic intrusions are almost everywhere associated with comagmatic lavas and tuffs (mainly in the younger strata), and the coal beds themselves are to some extent enriched in pyroclastic material, particularly in the upper horizons. This paper gives a worldwide review of igneous intrusions in coal beds. 24 references.

• Research Organization: All-Union Geological Research Institute, Leningrad (USSR)
• OSTI ID: 7230359
• Journal Information: Int. Geol. Rev.; (United States), Journal Name: Int. Geol. Rev.; (United States) Vol. 29:8; ISSN IGREA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
CHEMICAL COMPOSITION
COAL DEPOSITS
CORRELATIONS
DEPTH
DIMENSIONS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GLOBAL ASPECTS
IGNEOUS ROCKS
INTRUSION
LAVA
MINERAL RESOURCES
RESOURCES
ROCKS
SHAPE
SIZE
STRATIGRAPHY
TUFF