8.The Ophiolite massifs are composed of mantle peridotite that is mainly harzburgite and dunite, and lacked of crust magmatite within the typical Ophiolite suite.
9.A rigid and light mantle joins tightly between the geophone body and its tailcone, combining with the tailcone, to form a device called geophone seat.
10.Hence, for the minerals to be analyzed in some rocks, when there are all sorts of genesis with xenolith, magma, mantle and so on in them,the age of a certain single event can be respectively got.