Qoima orthophyre is an intrusive of Himalayan orogenic period, with relatively high content of bulk alkali (K2O>Na2O) and comparatively high ratio of LREE to HREE. The REE model is of right_inclined type with fairly great gradient. In addition, the accessory mineral assemblage can be assigned to the spatite-sphene-magnetite type.
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白云山 李莉,2002,羌塘中部雀莫正长斑岩体特征及构造意义[J].岩石矿物学杂志,21(2):169~173. BAI Yun-shan, LI Li,2002,Characteristics of Qoima orthophyre in central Qiangtang and its tectonic significance[J]. Acta Petrologica et Mineralogica,21(2):169~173.
