granosyenite

An analysis of petrography, major elements, trace elements and isotopic elements of Late Triassic-Early Jurassic syenogranites-alkali feldspar granites in Yichun area of Heilongjiang Province shows that most of these rocks have high temperature idiomorphic or conical quartz, accessory mineral fluorite, graphic texture and drusitic structure.

黑龙江伊春地区晚三叠世—早侏罗世正长-碱长花岗岩的岩石学和主、微量元素及同位素分析结果表明,岩石中大多含有高温自形或锥形石英、副矿物萤石和文象结构、晶洞构造等;岩石化学特征上具有高硅、富碱和低钙镁、偏铝质-过铝质特点,稀土元素配分模式呈轻稀土元素略微富集的、缓向右倾斜而重稀土元素较为平坦、铕亏损的海鸥型,富集高场强元素(HFS)Zr和Ga,亏损Ba、Sr、Eu等;岩石中的石英包裹体均一温度为750~950℃,具有高温岩浆浅成被动就位的特征。