Which rock is usually deformed by ductile deformation?rhyolite, quartzite, chert or dolomite?
Deformation of rock depends upon the mineral binding capacity of essential mineralsand petrographical conditions of rocks.Quartzite is hardse rock of all cited it will not easily undergo deformation rhyolite volcanic equivalent of granite -it also stable Dolomite generally undergo faster deformation due to calcite minerals,. Calcite minerals not stroger than quartz minerals -due to their physical and mineralogical nature. Except dolomite other minerals having quartz minerals are stable . Physico-meccanical prpoerties also tested in laboratory DRDVENKAT REDDY-Asst prof,Geology Section,Dept of Civil Engg,NITKSurathkal,India
quartzite. that website (above) shows dolomite deforming cataclastically, which is brittle, not ductile.
Hard top. Soft can tear and don't last as long. Besides, u get what u pay for. If BMW is kinda high, naturally it's better quality.
First of all any rock can undergo ductile formation under the right conditions. 1.) Heat pressure - if enough heat pressure are applied as in conditions deep w/in the earth then ductile deformation can occur. 2.) Time - if a rock has pressure applied over long periods of time then ductile deformation can occur. If done over short periods of time a rock may undergo brittle deformation no matter what type of rock it is. The question you are asking I believe has to do w/ composition. 3.) Composition - rocks w/ strong internal bonds are more likely to undergo brittle deformation whereas rocks w/ weak bonds will more than likely undergo ductile deformation. Rocks in the former category include igneous such as basalt granite. Rocks in the latter category would include sedimentary some types of metamorphic rocks. Rocks such as quartz feldspars tend to be very brittle whereas ones containing calcite micas are more ductile. Based on this, the answer to your question would be dolomite just as the first person said. Why? Rhyolite is composed of quartz feldspar; Chert is made of cryptocrystalline quartz; Quartzite is made up of quartz (SiO2). Dolomite is calcium magnesium carbonate or quite simply put, a carbonate rock. It will be more likely to deform than the other 3.
