diabase

/dahy-uh-beys/US // ˈdaɪ əˌbeɪs //UK // (ˈdaɪəˌbeɪs) //

辉绿岩,辉光岩,辉石岩,辉石

Definitions

n.名词 noun

1
Petrology.
- : a fine-grained gabbro occurring as minor intrusions.
- : British. a dark igneous rock consisting essentially of augite and feldspar; an altered dolerite.

They are holocrystalline in form and true glassy bases are rare, rendering the term diabase more appropriate than basalt.
While the diabase dikes are most prominent in the Newark rocks, they are also found occasionally in the other terraces.
The diabase occurs only as an intrusive rock in the vicinity of the Catoctin Belt.
None the less, its origin as diabase can definitely be asserted of the whole mass.
Dynamic alteration of the Catoctin diabase is pronounced and wide-spread.