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  • noun

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a granular crystalline intrusive rock

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Small tonalitic to dioritic bodies (Mill Brook quartz diorite and related plutons) occur along the margins of these large plutons.
and Blecha V.: 2010, Dioritic intrusions of the Slavkovsky les (Kaiserwald), Western Bohemia: their origin and significance in late Variscan granitoid magmatism, Int.
Less frequently, the same minerals occur on the surfaces of altered dioritic gneiss xenoliths, and microcline, clinochlore, cerian epidote and synchysite-(Ce) have all been identified as rare accessory minerals in vugs within the calcite vein.
This black sand contrasts with the general idea of white or gold sand in coralligenous, calcareous, or dioritic areas.
The gold/silver mineralisation occurs in high temperature quartz veins filling fissures in a dioritic batholith of Jurassic age.
The recently staked NVI property covers an undated, multiphase, porphyritic intrusive complex of predominantly dioritic composition which cross cuts Middle to Upper Triassic mafic volcanic rocks of the Karmutsen Formation.
The results of petrographic studies indicate that the rocks are mostly of doleritic to dioritic compositions characterized by vein and cavity fillings of calcite.
Dioritic microgranular enclaves are distributed throughout the granite, which are generally several centimeters in diameter, and are rounded, ellipsoidal, or lenticular in shape (Figure 2(c)).
Rocks of the study area are mainly comprised of stage-2 fine to coarse grained granitoids of Ladakh Batholith The dioritic rocks present in the study area are hornblende bearing having high concentration of plagioclase.
Raeside and Barr (1990, 1992) positioned the EHSZ along the westernmost fault splay at the western edge of the Kathy Road Dioritic Suite and therefore in-bound of the contact with the Carboniferous basin, suggesting that the fault being exploited is not the EHSZ.
Current interpretation of these encouraging results indicates at least four mineralised zones within an intrusive body of granodioritic to dioritic composition, a sheared ultramafic unit (9m @ 1.3g/t Au and 0.5% Cu), a basalt (previously reported 3m @ 7.8g/t Au and 0.2% Cu), and a pyrrhotitic black shale.