In this study, Ar-Ar isotope dating of muscovite, hornblende and phlogopite was carried out in order to con.

To gain a better understanding of the age of gold mineralization and its relationship with the evolution of the ductile shear zone,40Ar/39Ar plateau age analysis was made on biotitefrom biotite-quartz gneiss and on hornblende from biotite-hornblende mylonite.

Based on the characteristics of hornblendes, we classified the alkali granitoids as two types.

Crystallographic preferred orientation of amphibole in retrograded eclogites;

On the basis of petrography and mineral chemistry of the xenoliths,the amphiboles in them can be subdivided into four kinds of occurrences,i.

As one of major mineral phases in the intermediate-mafic intrusions in Southern Taihang Mountains, amphibole can be used to constrain its petrogenesis.

The ZBJ hornblende,as K-Ar age geostandard of China,was sampled from the Fangshan granodiorite in southwestern Beijing.

The hornblendite in Danailingou, with clear cryptoexplosion brecciated structure and mi-crolitic texture, occurs within Jurassic intermediate to acid volcanic rocks in a vein shape.

This paper chooses the Yaogou hornblendite body, one of the two major ultramafic outcrops in the Laiyuan batholith, as a representative to carry out detailed research.