摘要
尾亚复式岩株由尾亚超单元(外环)及环形山超单元(内环)组成。由完全不同成分、不同岩浆源的两个独立岩浆作用,沿同一通道就位的产物。外环为碱性辉长岩、石英正长岩、碱长花岗岩,内环为钙碱系列的石英闪长岩-花岗闪长岩-二长花岗岩-钾长花岗岩。北侧侵入于早石炭世卡拉火大山组及白尖山超单元中。依据同位素年龄测定,其生成年龄270.67～267.3Ma,为早二叠世;环形山超单元生成年龄230～250Ma,为晚二叠世。
Weiya composite stocks comprise a circular body including Weiya super-unit (outer circle) and Huanxinshan super-unit (inner circle). It is a product of two phases of magmatic intrusion with different composition and magmatic source along the same intrusive passage. The outer circle consists of alkaline gabbro, quartz syenite and alkali-feldspar granite. The inner circle consists of quartz diorite-granodiorite-adamellite-moyite of calc-alkaline series. The stocks intruded into mylonitized Karahodashan Formation with early Carboniferous fossils and Baijianshan super-unit. The isotopic dating gives an age of 270.67-267.3 Ma for Weiya super-unit, and 230-250 Ma for Huanxinshan super-unit. Therefore the age of formation of Weiya composite stocks is constrained as Permian.
出处
《新疆地质》
CAS
CSCD
2002年第4期357-359,共3页
Xinjiang Geology
关键词
形成时代
复式岩株
同位素年龄
晚二叠世
岩浆
the eastern Tianshan mountains
composite stocks
super-unit
isotopic age
age of formation
