Question

In which of the following geological settings does mylonite characteristically form?

1) at the bottom of sedimentary basins
2) along the margins of magma bodies
3) in turbulent streams
4) in deep, ductile portions of fault zones
5) in shallow, brittle portions of fault zones

Answer 1

Mylonite typically forms in the deep, ductile portions of fault zones where high pressure and shear stress lead to plastic deformation of the rock.

Step-by-step explanation:

Mylonite is a type of metamorphic rock that is characterized by a fine-grained, layered appearance resulting from intense pressure and shear stress. This kind of rock typically forms in the deep, ductile portions of fault zones where there is enough depth for the rock to deform plastically, rather than fracturing, which happens in the brittle upper crust.

Mylonite does not typically form at the bottom of sedimentary basins, along margins of magma bodies, in turbulent streams, or in shallow, brittle portions of fault zones. Within these environmental settings, one would expect to find other types of rocks and sedimentary deposits that are indicative of the specific processes and conditions present there, such as clastic sediments in streams or igneous intrusions alongside magma bodies.