黑龙江霍龙门地区早石炭世花岗岩的锆石U-Pb年龄、地球化学特征及构造意义
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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, geochemical characteristics and tectonic implications of Early Carboniferous granites in Huolongmen area, Heilongjiang Province
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    摘要:

    提要:黑龙江霍龙门地区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,岩性主要为二长花岗岩、正长花岗岩、碱长花岗岩。研究区二长花岗岩SHRIMP锆石U-Pb定年结果为(351.5 ± 3.5)Ma,表明其形成于早石炭世。该时代岩石的主量元素具有高硅、略富铝、富碱质、低镁和贫钙的特征;微量元素表现出Th、Zr、Nd、Rb、K 明显富集,而Ba、Sr、Nb、P、Ti 明显亏损;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,有明显的负Eu异常,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。花岗岩的R1-R2构造环境判别图解与微量元素Rb-(Yb+Nb)、Rb-(Yb+Ta)构造环境判别图解显示,该期发育的早石炭世花岗岩为同碰撞与造山期后的环境,结合本区所处的构造环境推测研究区内早石炭世花岗岩应为兴安地块与松嫩地块北东向拼合挤压过程由碰撞俯冲阶段向后造山阶段构造转换过程的产物。

    Abstract:

    Abstract:The Huolongmen area in Heilongjiang Province is tectonically located at the juncture between the Songnen Block and the Xing’an Block in the east of the Xingmeng oregenic belt. Large volumes of Neopaleozolc granitic rocks are distributed in this area. The granitic rocks are composed mainly of monzogranite, syenogranite and alkali-feldspar granite. The zircon U-Pb SHRIMP dating of monzonite granite yielded the concordant age of 351.5 ± 3.5Ma. Major element analyses show high SiO2(73.38%~78.68%)and alkali content(K2O+Na2O=6.58%~9.61%), slightly high Al2O3(11.25%~14.50%)content and low MgO(0.1%~0.57%)and CaO(0.07%~0.89%) content. Trace element studies demonstrate the enrichment of Th, Zr, Nd, Rb, K and depletion of Ba, Sr, Nb, P, Ti. The samples are enriched in LREE (light rare earth elements) and depleted in HREE (heavy rare earth elements) with pronounced Eu anomalies(δEu=0.09~0.72), suggesting a high degree of fractionation ((La/Sm)N=2.12~6.60,(Gd/Yb)N=0.71~2.48). The granites generally belong to the high-K calc-alkaline series and might have been produced by the magma that experienced a relatively high degree of crystallization differentiation. Most Neopaleozoic granites fall in the post-orogenic zone and the volcanic arc granite zone, respectively, in the R1-R2 structural setting discrimination diagram and the (Yb+Nb)-Rb versus (Yb+Ta)-Rb discrimination diagram, suggesting that the Xing’an Block and Songnen Block might have experienced collision and suturing during Late Paleozoic.

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李成禄 曲 晖 赵忠海 徐国战 王 卓 张俭峰. 黑龙江霍龙门地区早石炭世花岗岩的锆石U-Pb年龄、地球化学特征及构造意义[J]. 中国地质, 2013, 40(3): 859-868.
LI Cheng-lu, QU Hui, ZHAO Zhong-hai, XU Guo-zhan, WANG Zhuo, ZHANG Jian-feng. Zircon U-Pb ages, geochemical characteristics and tectonic implications of Early Carboniferous granites in Huolongmen area, Heilongjiang Province[J]. Geology in China, 2013, 40(3): 859-868(in Chinese with English abstract).

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  • 在线发布日期: 2013-08-20
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