摘要
康南白石梁一带超基性岩体SiO2含量44.06%~43.25%,小于45%,岩性主要为橄榄辉长岩,具高Mg,Fe,低Al特征,为碱性岩石序列。微量元素显示K,Ba,P,Sm富集明显,Rb,Hf元素亏损较严重,重稀土分馏明显,轻稀土富集,重稀土亏损,具岛弧侵入岩基本特征,岩体形成时代为(307.3±2)Ma。结合区域构造演化特征,认为早石炭世晚期洋盆闭合后,康古尔洋盆两侧岛弧为软碰撞形式对接过程中的产物,形成于后碰撞火山弧环境。该岩体剥蚀程度低,Fo值较低,低NiO含量,表明其分异结晶程度较高,可能深部发生过硫化物熔离作用,说明深部具较好的镍找矿前景。
The SiO2 content of the Kangnan superbasic rock mass is 44.06%~43.25%,all of which are less than 45%.It is an ultrabasic intrusive rock mass.Its lithology is mainly olive gabbro,with high Mg,Fe,and low Al characteristics.Sexual rock sequence.Trace elements show that K,Ba,P,and Sm are enriched obviously,Rb,Hf elements are more severely depleted,heavy rare earths are fractionated,light rare earths are enriched,and heavy rare earths are depleted,showing the basic characteristics of island arc intrusions.Its formation age is(307.3±2)Ma.Based on the regional tectonic evolution characteristics,it is considered that it is the product of the process of docking the island arcs on both sides of the Kangur Ocean Basin in the form of soft collision after the closure of the late Early Carboniferous ocean basin,and formed in a post-collision environment.Volcanic arc environment.Conan ultrabasic intrusive rocks have a low degree of erosion,a low Fo value,and a low NiO content,indicating a high degree of differentiation and crystallization,and the sulfide dissociation may occur in the deep part,indicating that the deep part has better nickel Prospecting prospects.
作者
韩琼
赵同阳
李平
郑加行
孙耀锋
Han Qiong;Zhao Tongyang;Li Ping;Zheng Jiaxing;Sun Yaofeng(Xinjiang Institute of Geological Survey,Urumqi,Xinjiang,830000,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第2期168-173,共6页
Xinjiang Geology
基金
新疆区域地质调查片区总结与服务产品开发(DD20160345-04)
新疆鄯善县灵北地区1∶5万K46E013005等二幅区域地质调查(T15-1-LQ22)联合资助。
关键词
康南岩体
橄榄辉长岩
地球化学特征
成矿潜力分析
Kangnan ultrabasic rock mass
Peridotite
Geochemical characteristics
Metallogenic potential analysis
