| 于小亮,蔡成龙,魏小林,刘溪溪,岳鑫.南祁连疏勒南山地区中奥陶世侵入岩锆石U-Pb年龄、地球化学特征及其地质意义[J].矿产勘查,2018,9(11):2049-2058 |
| 南祁连疏勒南山地区中奥陶世侵入岩锆石U-Pb年龄、地球化学特征及其地质意义 |
| Zircon U-Pb geochronology, geochemical characteristics and geological significance of Middle Ordovician intrusive rocks in Shulenanshan area of South Qilian |
| 投稿时间：2018-05-09 |
| DOI： |
| 中文关键词: 侵入岩 锆石U-Pb年龄 地球化学 疏勒南山 南祁连 |
| 英文关键词: intrusive rocks, zircon U-Pb geochronology,geochemistry, Shulenanshan, South Qilian |
| 基金项目:中国地质调查局项目(编号:1212011221151)资助。 |
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| 中文摘要: |
| 位于南祁连疏勒南山地区的侵入岩,岩石类型主体为花岗闪长岩和石英闪长岩。花岗闪长岩LA-ICP-MS锆石U-Pb年龄为(463.6±3.7)Ma,形成于中奥陶世。岩石地球化学特征显示,疏勒南山地区侵入岩具有高硅、高铝、高钾钙碱性特征；富集LREE、Rb、Th、Ce、Hf元素,亏损Ba、Nb、Zr元素,具有Eu负异常(0.69~0.89)。疏勒南山地区侵入岩在构造环境判别图解中均落入火山弧花岗岩,结合区域构造演化,认为其是形成于俯冲构造背景之下的岛弧型花岗岩。 |
| 英文摘要: |
| The intrusive rocks in Shulenanshan area,located in southern Qilian Mountains,is mainly composed of quartz diorite and granodiorite. The granodiorite were formed in the Middle Ordovician with U-Pb age of 463.3±3.7Ma(LA-ICP-MS zircon). The rock geochemical characteristics show that the intrusive rocks of Shulenanshan area is rich in SiO2 ,in Al2O3 ,and rich-K calc-alkali. It is enriched in LREE,Rb,Th,Ce and Hf and depeted in Ba,Nb Zr with strong negative anomaly of Eu(δEu=0.69~0.89). The petro-geochemical characteristics suggested that the intrusive rocks should be the S-type granite which remelted from crustal material. In the discrimination diagrams for tectonic settings,the samples of The intrusive rocks in Shulenanshan area lie in the area of volcanic arc granite.In combination with comprehensive analysis of the tectonic evolution,It is considered to be an island arc granite formed in the background of subduction tectonic. |
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