摘要
下石炭统大哈拉军山组主要分布于西天山伊犁盆地,不整合在志留纪地层或老地层之上,其上被阿克萨克组角度或平行不整合覆盖.火山岩组合为玄武岩、安山岩、流纹岩及安山岩、流纹岩组合,以安山岩发育为特征.玄武岩属岛弧拉斑玄武岩和钙碱性系列,属太平洋型钠质类型,稀土、微量元素显示具岛弧特征,大地构造位置为岛弧中心靠近大洋一侧,与南侧那拉提晚泥盆—早石炭世侵入岩共同组成火山弧,同为古亚洲洋向北俯冲的产物.
daihalajunshan formation of early carboniferous was been mostly distributed in yili basin of western tianshan, it unconformity cover on the Silurian stratum and older stratum,and was been covered by akesake formation in angular unconformity and disconformity, the volcanic rock combination is basalt-andesite-rhyolite and andesite-rhyolite, the basalt is belong island arc tholeiite and series of the calc-alkaline,and have character of island arc in rare earth element and trace element. The tectonic location at the center of island arc and close up ocean. It consist volcanic arc together with the plutons of lanati in the late Devonian-early carboniferous, the volcanic northward.
出处
《新疆地质》
CAS
CSCD
2006年第3期218-222,共5页
Xinjiang Geology
基金
中国地调局大调查项目(200213000018)资助
关键词
西天山
大哈拉军山组
火山岩
岛弧
western tianshan
daihalajunshan formation
volcanic rock
arc was the result of ancient asia ocean subduct island arc
