Regional Metamorphism

December 15, 2018 admin 0

Regional metamorphism is a common, widespread type of metamorphism typically associated with mountain building, where large segments of Earth’s crust are intensely deformed by the […]

Contact, or Thermal, Metamorphism

December 15, 2018 admin 1

Contact metamorphism, or thermal metamorphism, occurs in Earth’s upper crust (low pressure), when rocks immediately surrounding a molten igneous body are “baked” (high temperature). Because […]

Common Metamorphic Rocks

December 15, 2018 admin 2

Most metamorphic rocks that we observe at Earth’s surface were derived from the three most common sedimentary rocks—shale, limestone, and quartz sandstone. Shale is the […]

Kinking and chevron folding

December 10, 2018 admin 1

Kink bands are common in well-laminated and anisotropic rocks rich in phyllosilicate minerals, and some  field occurrences are shown in Figure. Kink bands are centimeter- […]

Migmatites

December 2, 2018 admin 0

Figure 1 – Migmatite Under highgrade metamorphism, light-colored (felsic) minerals in a gneiss may begin to melt, while the darkcolored (mafic) minerals remain solid. If […]

Metamorphic Textures

October 29, 2018 admin 5

The term texture is used to describe the size, shape, and arrangement of the mineral grains within a rock. Recall that texture is one way […]

Metamorphism

What Is Metamorphism?

October 15, 2018 admin 1

Unlike some igneous and sedimentary processes that occur in surface or near-surface environments, metamorphism most often occurs deep within Earth, beyond our direct observation. Notwithstanding […]

Common Metamorphic Rocks

Common Metamorphic Rocks

October 8, 2018 admin 2

Most metamorphic rocks that we observe at Earth’s surface were derived from the three most common sedimentary rocks—shale, limestone, and quartz sandstone. Shale is the […]