Camptonite

from Wikipedia, the free encyclopedia

Camptonit is the name of a previously Buchonit called volcanic rock .

It is a dark magma rock that is interspersed with bronze-colored, large biotite mica . Finds on Kalvarienberg near Poppenhausen (Wasserkuppe) were first described as Buchonite . It got its previous name after the old name Buchonia for the region around Fulda . According to petrographers, it was formed by mixing a basaltic and phonolithic magma melt.

Further descriptions than Buchonit

Justus Roth described it as nepheline basalt. In 1873 he described the Rhön and Sinsheim as sites . He described it as usually dark gray rock containing various secreted substances. Including a mica-like mineral (according to Roth not biotite), hornblende and magnetite . Poppenhausen's Buchonite occurs between phonolite and basalt. He was referring to Fridolin Sandberger when he stated that it had a chemical similarity to a prophyric nephelinite . In 1887, Roth described the Buchonite only as nepheline tephrite, which had a hornblende.

Otto Heinrich Erdmannsdörffer published the most comprehensive description in 1933. He described Florian Sandberger as the name of the “basaltic” rock, which several authors have already reported. Sandberger also carried out an initial chemical analysis, which was later confirmed by several other experiments. Hugo Bücking was the first to describe the geological conditions and to draw up brief petrographic characteristics. From his mapping of the Kalvarienberg it can be seen that the phonolite there was broken very irregularly through the red sandstone with several apophyses in the adjacent rock. The Buchonite on Kalvarienberg lies in several clod-like parts in the phonolite and also on the edge. The two rocks are closely welded to one another with a partially sharply delimited and a partially gradual transition.

Erdmannsdörffer describes Buchonite as a directionless rock colored dark black-gray. Jagged biotite flakes with a size of up to 10 mm in diameter and 0.3 mm in thickness are randomly stored in it. This gives the rock a peculiarly chopped surface. Hornblende can be found in it in slender columns up to 6 mm in size. Can be microscopically plagioclase , sanidine , nepheline and pyroxene additional evidence.

literature

  • OH Erdmannsdörffer : About the Buchonit von Poppenhausen in der Rhön , Walter de Gruyter & Co., Berlin and Leipzig 1933 (also 3rd treatise born in 1933 from session reports of the Heidelberg Academy of Sciences - mathematical and natural science class )

Web links

Individual evidence

  1. ^ Wilhelm Mons: The prehistory of the Rhön in Thomas Heiler , Udo Lange, Gregor K. Stasch, Udo Verse: The Rhön - History of a Landscape, Michael Imhof Verlag, Petersberg 2015, ISBN 978-3-7319-0272-0 , p 134
  2. ↑ Wilhelm Mons : Heimat rocks, minerals and fossils in Hans Dieter Nüdling (ed.): 100 years of Franz Carl Nüdling - From quarry to industrial enterprise 1893 to 1993, self-published 1993, p. 176/177
  3. ↑ Justus Roth: Contributions to the petrography of the plutonic rocks , ISBN 9783846061107 (new edition 2015 as a reprint of the original 1873), p. 92
  4. ^ Justus Roth: Contributions to the petrography of the plutonic rocks , ISBN 9783846061107 (2015 new edition as a reprint of the original 1873), pp. 123/124
  5. ^ Justus Roth: Petrography. Formation, composition and change of rocks , ISBN 9783958006867 (new edition 2016 as a reprint of the original 1887), p. 280
  6. ^ OH Erdmannsdörffer, p. 3
  7. ^ OH Erdmannsdörffer, p. 5/6