大兴安岭东北部多宝山地区花岗岩锆石U-Pb年龄及岩石地球化学特征
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中国地质调查局“黑龙江多宝山地区矿产远景调查”项目(1212010781024)资助。


Zircon U-Pb ages and geochemical characteristics of the granites in Duobaoshan area, Northeast Da Hinggan Mountains
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    摘要:

    提要:大兴安岭多宝山地区在构造上位于兴蒙造山带东部的兴安地块和松嫩地块接触带上,区内花岗岩类以晚古生代花岗岩为主,岩性主要为碱长花岗岩、正长花岗岩。两类岩性的锆石SHRIMP测年结果分别为(309.0±3.0)Ma、(299.3±2.8)Ma,均为晚石炭世。其主量元素以富Si、略富Al、富碱质和低Mg、低Ca为特点;微量元素表现出富集Th、Zr、Nd、Rb、K和亏损Ba、Sr、P、Ti的特点;稀土元素具有明显的轻稀土元素富集、重稀土元素相对亏损的特征,轻重稀土元素分馏程度较强。岩石总体上属于高钾钙碱性系列花岗岩,是岩浆经历了高度结晶分异作用的产物。岩石地球化学特征表明其特征类似S型花岗岩,其源岩物质来自于地壳。

    Abstract:

    Abstract:The Duobaoshan area in Da Hinggan Mountains is tectonically located in a fold belt between the Songneng Block and the Xing’an Block in the east of the Xingmeng oregenic belt. Large quantities of Neopaleozolc granitic rocks are distributed in this area. This lithology is mainly composed of monzonitic granite and syenogranite. SHRIMP zircon U-Pb dating yielded ages of 309.0± 3.0Ma and 299.3± 2.8 Ma. Major element analyses show high SiO2 and alkali content, slightly high Al2O3 content and low MgO and CaO content. Trace element studies demonstrate the enrichment of Th, Zr, Rb, Nd, K and depletion of Ba, Sr, P, Ti. The samples are enriched in LREE (light rare earth elements) and depleted in HREE (heavy rare earth elements), suggesting a high degree of fractionation. The granites generally belong to the high-K calc-alkaline series and might have been produced by the magma that had experienced a high degree of crystallization differentiation. Petrological geochemistry shows that the granites are quite similar to S-type granite, with the material source derived from the crust.

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曲 晖 李成禄 赵忠海 王 卓 张俭峰. 大兴安岭东北部多宝山地区花岗岩锆石U-Pb年龄及岩石地球化学特征[J]. 中国地质, 2011, 38(2): 292-300.
QU Hui, LI Cheng-lu, ZHAO Zhong-hai, WANG Zhuo, ZHANG Jian-feng. Zircon U-Pb ages and geochemical characteristics of the granites in Duobaoshan area, Northeast Da Hinggan Mountains[J]. Geology in China, 2011, 38(2): 292-300(in Chinese with English abstract).

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