东秦岭灵山岩体岩石谱系单位类埃达克质花岗岩及其成因和构造环境意义

灵山岩体地处东秦岭造山带的南秦岭构造带的桐(柏)-商(城)断裂两侧。根据内部接触关系和结构等方面的差异,将灵山岩体划分为主侵入期四个单元和补充期三个独立单元。该花岗岩属高硅碱富钾贫钙低镁碱性系列,稀土元素总量较高且具右倾海鸥式配分模式,微量元素具富集大离子亲石元素K、Rb、Ba等和亏损高场强元素Zr、Hf、P、Ta、Nb、Ti等特点;是具有某些I型(类埃达克质)花岗岩地球化学特征的同熔性S型花岗岩,形成于弧-陆碰撞造山后(非造山)的拉张环境。

The lithodemic units of adakite-like granite on genetic Types and tectonic settings for the Lingshan Pluton,East Qinling

Lingshan Pluton is located in two sides of the Tongbai-Shangcheng Fault, which is the south Qinling metamorphic belt of East Qinling orogenic belt. According to the internal contact relation and structure differ-ences, Lingshan Rock stage divided into four main units as well as another three independent units. Lingshan granite show high silica- alkali, potassium-rich , low magnesium, poor calcium alkaline series. The high total REE is rightward incline, and the features of trace elements are rich in large ion lithophile elements (K, Rb, Ba). while the high field strength elements (Zr, Hf, P, Ta, Nb, Ti) are depleted. Lingshan granite is syntectic S-type with the geochemical characteristics of I-type and adakite-like granite, which was formed in the arc-continent post collision (anorogenesis) tensional environment.