Antigorite breaks down at 600-700 �C and between 2-5 GPa . Antigorite contains 13 wt . % water and therefore causes substantial mantle melting.
12.
Antigorite is the polymorph of serpentine that most commonly forms during metamorphism of wet ultramafic rocks and is stable at the highest temperatures to over at depths of or so.
13.
Some of the suggested instability mechanisms include dehydration embrittlement caused by the breakdown of antigorite or chlorite in a hydrated peridotite upper mantle, and un-bending of the slab.
14.
This strata of the Lower Paleozoic ( approximately 430 million years old ) consists predominantly of the serpentine minerals, antigorite, chrysotile, and lizardite, it also contains asbestos and talc.
15.
Nearly the entire area is underlain by dunite, a variety of peridotite consisting of dark green olivine and minor chromite, which has been partly or entirely serpentinized to antigorite magnesite-magnetite.
16.
The dark bands are composed of completely pseudomorphosed olivine ( replaced by antigorite, reddish iddingsite, Mg-chlorite and magnetite ), whereas the light bands consist of tremolite fibers, Mg-chlorite and magnetite.
17.
Titanian chondrodite has been found as inclusions in olivine in serpentinite in West Greenland, where it is associated with clinohumite, olivine, magnesite, magnetite and Ni-Co-Pb sulfides in a matrix of antigorite.
18.
Ultramafic rocks in purely hydrous, CO 2-free environments will tend to form serpentinite-antigorite-brucite-tremolite assemblages ( dependent on MgO content ) or at amphibolite to granulite metamorphic grade, metamorphic pyroxene or olivine.
19.
Hence, antigorite may play an important role in the transport of water into the earth in subduction zones and in the subsequent release of water to create magmas in island arcs, and some of the water may be carried to yet greater depths.
20.
The more attractive and durable varieties ( all of antigorite ) are termed " noble " or " precious " serpentine and are used extensively as Indian subcontinent was known for centuries for finishing a relatively pure form of green serpentine obtained from quarries in Afghanistan into lapidary work, cups, ornamental sword hilts, and dagger handles.
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