serpentinite

Moore and Rymer think the more likely culprit is talc that forms along veins and fractures in the serpentinite due to the combination of shearing along the fault and a chemical reaction to hydrothermal water circulating through the rock.

Soft Powder May Ease Friction Along San Andreas Fault | Impact Lab 2007

Some scientists have suggested that the creep could be caused by serpentinite, a relatively soft, greenish rock that was formed in the ocean crust and later thrust onto the continent during a collision with the North American tectonic plate before the San Andreas was formed.

Soft Powder May Ease Friction Along San Andreas Fault | Impact Lab 2007

Beneath continents, the Serpentosphere is mainly composed of antigorite alpine peridotite/serpentinite and may be several kilometers thick.

At it Again Silver Fox 2008

Saddlebag and Dot islands are bedrock features consisting of serpentinite rock that is over 200 million years old.

Padilla Bay National Estuarine Research Reserve, Washington 2008

A close relationship between trace elements in crude oils and serpentinite has been found.

At it Again Silver Fox 2008

It might have been in some comments elsewhere, or maybe in something I haven't posted yet: the occurrence of hydrocarbons in vugs in silicified, Hg-bearing, Au-anomalous serpentinite near the McLaughlin gold mine - that was what I was referring to.

At it Again Silver Fox 2008

Scattered outcrops of very basic serpentinite also occur. formations predominate and Precambrian gneisses are common in the east.

Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA) 2008

When ocean Serpentosphere is subducted beneath continental or oceanic crust areas, it converts to antigorite-dominated serpentinite rock generally coincident with greenschist facies metamorphism.

At it Again Silver Fox 2008

Chrome soils from serpentinite occur locally and are low in calcium and high in magnesium, chromium, and nickel.

Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA) 2008

The Serpentosphere consists of an earth-wide nearly continuous layer (or spherical shell) of rock dominated by serpentine group minerals (serpentinite).

At it Again Silver Fox 2008