blueschist

It is glaucophane's color that gives the blueschist facies its name.

These have been metamorphosed to the blueschist level.

The first, composing 65 percent of the total, was blueschist apparently originating from Euboea.

Some of the rocks were metamorphosed to blueschist.

This is made up of high-pressure metamorphic rocks, eclogite and blueschist.

Blueschist outcrops are found in the area.

The rocks experienced low-temperature-high-pressure overprint which reached the blueschist facies.

Lawsonite is a metamorphic mineral typical of the blueschist facies.

It is a metamorphic mineral associated with the blueschist and greenschist facies.

It is a location of high pressure and low temperatures where blueschist facies metamorphic rocks occur.

The rocks are characterized by prehnite-pumpellyite, blueschist or eclogite facies minerals.

Due to the high pressures at these depths, much of the material had been metamorphosed in the blueschist or eclogite facies.

Special subduction related metamorphism to blueschist facies is known from the Bôrka nappe.

The blueschist facies forms the following mineral assemblages:

The blueschist facies is at relatively low temperature but high pressure, such as occurs in rocks in a subduction zone.

The unit shows traces of high-grade metamorphism in the form of eclogite and blueschist relicts.

Subduction resulted in blueschist metamorphism.

This is typically associated with high-pressure, low-temperature minerals such as phengite, garnet, glaucophane within the lower blueschist facies.

Tertiary eclogites do occur in the Penninic nappes, which contain material that has been through blueschist or eclogite facies.

Oceanic subduction (or underthrusting) is evidenced for the western and central parts by slivers of ophiolite and blueschist metamorphism.

Glaucophane, kyanite and zoisite are other common minerals in the blueschist facies and are commonly found to coexist (Pawley et al., 1996).

Blueschist facies is determined by the particular Temperature-Pressure conditions required to metamorphose basalt to form blueschist.

Talc can also be formed from magnesian chlorite and quartz in blueschist and eclogite metamorphism via the following metamorphic reaction:

Blueschist mineralogy varies by rock composition, but the classic equilibrium assemblages of blueschist facies are:

Subduction occurred between the Oligocene and the Miocene, and the metamorphic grade represents the southernmost extent of the Cycladic blueschist belt.