The Jongju Complex consists of six elongated multiple intrusions, mainly alkali pyroxenite, orthoclase pyroxenite, alkali gabbro, pegmatite and lamprophyre
Locally, ultramafic rocks, lamprophyre
diatremes and carbonatites are present (Veretennikov et al.
It is dominated by a granodiorite phase and is cross-cut by some later trachytic, doleritic, and lamprophyre
Dikes in the area were described by Nichols (1956) as lamprophyre
(see also Skehan and Rast 1990).
Additionally, one hole at Black Dog has also intersected a lamprophyre
In addition to these marginal faults there are several interbasinal gravity faults within the basin resulting in dislocation of coal seams and also dolerite dykes and sills of mica lamprophyre
(Ghosh and Mukhopadhyay, 1985).
4 Ma, while lamprophyre
CR 573 and basalt CR 564 yield whole-rock ages of 128.
There are a series lamprophyre
dykes on ground acquired five years ago by a series of companies but data hasn't been submitted, "so we don't know what was found," says Pace.
Deformations of lamprophyre
dykes 28-26 Ma in age along a NW-SE-striking transtensional zone related to this fault are visible in the Techlovice quarries (Cajz and Adamovic, 2003) and correspond to E-W extension.
magma in the Moldanubian Zone was separated from a hydrated lithospheric mantle as a result of thickening of the crust and of intensive melting of subducted deeper parts of lithospheric crust and rocks at the crust/mantle boundary.
It is also older than ages reported for lamprophyre
dykes elsewhere in central and southeastern New England, and if correct, indicates that alkaline magmatism in