diabasic texture

  • Diabase - Wikipedia

    Diabase (/ ˈ d aɪ. ə b eɪ s /) or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro.Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite (dark mafic glass).

  • Josephine Ophiolite - jersey.uoregon.edu

    A layperson's guide to... The Josephine Ophiolite and associated volcanic arc materials Josephine County, Oregon and Del Norte County, California