The plotting of rock modes on these triangular diagrams is simpler than it may appear. The three components, Q (quartz) + A (alkali (Na-K) feldspar) + P (plagioclase), are recalculated from the mode to sum to 10
How are Alluvial Fans Formed? How are alluvial fans formed? Alluvial fans form under specific conditions. First of all, flowing water must travel through a narrow gap such as a river or stream between canyon walls, hills, or mountains. As the water travels through this narrow passage, it ...
An Evaluation of the Rb vs.(Y±Nb) Discrimination Diagram to Infer Tectonic Setting of Silicic Igneous Rocks[J].Lithos 1997,40.An evaluation of the Rb vs. (Y+Nb) discrimination diagram to infertectonic setting of silicic igneous rock. Frsterhj,Tischendorfg,Trumbullrb. Lithos . 1997...
The largest time units on the geologic time scale are the eons. The oldest eon is the Hadean, followed by Archean, and then the most recent, Proterozoic. How are geologic time periods divided? The largest units of geologic time are the eons. Eons are divided into eras, then into periods...
How are igneous rocks formed? when molten rock (magma when underground and lava when on the surface), cools and solidifies, essentially "crystallizing" into a solid state, either deep within the Earth's crust (intrusive) or when erupted onto the surface through volcanoes (extrusive). ...
Since then, many studies have shown that some granites defy classification or their geochemical assignment does not fit with the geodynamic environment in which they are thought to have formed. In this paper we evaluate the performance of the Pearce et al. tectonic discrimination method, ...
How Deadly Is Quicksand? 8 of the World’s Most-Remote Islands geology Print Written and fact-checked by The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that...