摘要
随枣北部地区发育大量燕山期花岗岩体,以新黄断裂为界,南西侧主要为二长花岗岩,北东侧为钾长花岗岩。主要造岩矿物为钾长石、斜长石、黑云母和石英。岩浆岩总体酸度较高,高铝、相对富钾,以准铝质到过铝质钙碱性岩为主,属高钾一钾玄质系列。根据岩石化学参数判别为造山晚期花岗岩,属构造转折时期的岩石组合;微量元素蛛网图识别为同碰撞花岗岩和碰撞后花岗岩;微量元素对判别为同碰撞花岗岩(syn-COLG)和火山弧花岗岩(VAG);采用巴尔巴林构造环境识别为富钾钙碱性花岗岩类(KCG);Maniar和Piccoli构造环境判别属造山环境下的花岗岩。通过综合评判,结合区域大地构造演化规律,其构造环境应属于后碰撞阶段,地球动力学环境应为构造体制转换期。
The northern part of Suizhou and Zaoyang boasts abundant granitic pluton in Yanshanian with the Xincheng- Huangpi fault zone as the boundary.The southeast part of it have monzonitic granite ,and the northeast part of it have K-feldspar granite. The main kinds of rock-forming minerals are potassium feldspar, plagioclase, biotite and quartz. Magmatic with higher overall acidity, aluminum, relatively rich in potassium, the main representatives are peraluminous and metaluminous calc-alkaline rocks, and belongs to a high-K shoshonitic series. Discrimination based on chemical parameters of the rock late orogenic granite rock is a combination of tectonic transition period; spider diagram identified as granite and collision after collision with granite; trace elements of discrimination for the same collision granites （syn- COLG） and volcanic arc granites （VAG）; using Barr Bahrain tectonic environment identified as K-rich calc-alkaline granitoids （KCG）; Maniar and Piccoli tectonic discrimination is a granite orogenic environment. Through comprehensive evaluation, combined with regional tectonic evolution, its tectonic setting should belong to post-collisional stage, and its geodynamic environment should be tectonic regime transition period.
出处
《国土资源情报》
2014年第4期51-55,33,共6页
Land and Resources Information
关键词
花岗岩
微量元素
构造环境
岩体
Granite
Trace Elements
Tectonic Environment
Intrusive mass
