... and his remarkable ribs
"On the rock show is 2-3 cm thick aplite-Gängchen with quartz and Orthoklaseinsprenglingen in mikropegmatischer matrix, which were described by Schuster as well as Rhenopalite and are herausgewittert ribs." (Schneider and JUNG 1991, Geological Guide Saarland)
This seems the genesis of the ribs on the "stone oven" (Photo: Achim later) , a rock formation south of the queen's settled in Upper Churches (Freisen, Landkreis St. Wendel) in principle: Magmatic melts or hydrothermal solutions penetrated in a well-formed by pressure relief columns.
rhyolites, andesites and dacites, however, are often characterized by platy secretion as pillars of education. The excerpt below image (photo is from 2005 Roland Vinx, stone fixed on the ground, p. 135) a Flakiness bankige-form shows in phonolite.
Also on "The stone oven" I guess a platy secretion with subsequent filling of the columns by intrusive melts. Whether the conjecture holds, for further examination in the field. It will also be important to detect vertical structures that can prove that the course not only stayed on one level, but continued into the next higher "floor" moving to get there, turn horizontal spread.
platy secretion or columnar solidification and subsequent magmatic filling may have occurred only at a time when surrounded was the whole rock body still (estimated at many tens of meters or a few hundred meters) below the land surface, the so far not eroded Permian sedimentary rocks. Possibly followed by erosive exposure of the "Stone Cabinet. Also, a tilting of the rock
Moreover, we must assume that at least since the erosive exposure of the massif "The stone cabinet" of course, the weathering was gnawing on the rock: "ribs" and spaces have since been thus worn away already strong and been set back far be. "sliding" or similar signs which were due purely outwardly appear, it is therefore my opinion from the genetic interpretation are excluded because they have long since erosion would have fallen victim.
Since the term aplite often is restricted to granitoid plutonic rocks or Subvulkanite finds himself of course, the question of the main rock. The old local term 'Tholeyit ", which refers to BRITZ 1953 south of this rock of the mountain summit Weisel, today must lead to plenty of confusion. The type locality on Tholeyer Schaumberg has been studied by Jung in 1958 on mineral composition and chemical composition and the old had to be Tholeyit-term perspective. came after the intrusion of the storage aisle Schaumberg-shaped deposit it in a gravitational Kristallisationsdifferentiation: In effect, this means that could make a whole range of mineralogical and geochemical variations. could with the once as "Tholeyit / tholeiite" referred deposits - from today's point of view and today's terms - the rocks of andesite, basaltic andesite or Latit be meant in a broader sense, even a rock variation of olivine up to diorites. Thus, the old "Tholeyit" to a currently very vague, notion has become, with no more can be done - with a term from an earlier time, other research background.