Bojite

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Bojite is a variety of gabbro characterized by the presence of plagioclase feldspar and primary hornblende and absence of clinopyroxene typically associated with gabbroic rocks. It was initially defined by geologist E. Weinschenk in 1898.[1] [2] The term "bojite" has been superseded by the usage of "hornblende gabbro" as defined by the 1996 IUGS Subcommission on the Systematics of Igneous Rocks for rocks composed of plagioclase + hornblende and <5% pyroxene.[3] [4]

References[edit]

  1. ^ Weinschenk, E. (1898). Abh. Bayer. Akad. Wiss. 19: 541. 
  2. ^ Ellis, S.E. (1948). "On the delimitation of diorite and gabbro and related rocks". Min. Mag. 28: 447–469. doi:10.1180/minmag.1948.028.203.06. 
  3. ^ Woolley, A.R. (1996). "Classification of lamprophyres, lamproites, kimberlites and the kalsilitic, melilitic, and leucitic rocks: recommendations of the IUGS Subcommission on the Systematics of Igneous Rocks". Canadian Mineralogist. Special Issue 34: 175–186. 
  4. ^ British Geological Survey, Research Report Number RR 99-06, see Figure 13 [1]