世界地质 2017, 36(2) 402-412 DOI:   10.3969/j.issn.1004-5589.2017.02.008  ISSN: 1004-5589 CN: 22-1111/P

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本文关键词相关文章
晚侏罗世
锆石U-Pb年龄
地球化学
岩石成因
斑状正长花岗岩
斯木科
大兴安岭
本文作者相关文章
PubMed
大兴安岭北部斯木科地区晚侏罗世斑状正长花岗岩年代学、地球化学特征及其成因
刘世伟1, 孙国胜1, 王清海2, 晋瑞香1, 何欣1, 刘承先1
1. 吉林大学地球科学学院, 长春 130061;
2. 吉林大学东北亚国际地学研究与教学中心, 长春 130026
摘要

对斯木科斑状花岗岩进行了锆石LA-ICP-MS U-Pb年代学及岩石地球化学特征研究。测年结果显示,该岩体年龄为(144±0.85)Ma,为晚侏罗世。岩石地球化学分析表明,斯木科斑状正长花岗岩为准铝质-过铝质岩石,属于高钾钙碱性系列;稀土元素丰度总量较高,轻稀土富集且轻重稀土分馏较明显[(LaN/YbN=3.15~6.63)],表现为“右倾型”的稀土配分模式,岩石具有轻度的负Eu异常(δEu=0.54~0.66);微量元素以相对富集Rb、K等大离子亲石元素,而相对亏损Nb、Ta、P、Ti等高场强元素为特征。斯木科斑状正长花岗岩具有高分异I型花岗岩的特征,来源于地壳中火山岩的部分熔融。对Nb-Y构造环境判别图解及构造环境讨论,结合其所具有的I型花岗岩的特征,斯木科斑状正长花岗岩应为伸展构造体制下的产物,形成于造山后伸展构造环境。

关键词 晚侏罗世   锆石U-Pb年龄   地球化学   岩石成因   斑状正长花岗岩   斯木科   大兴安岭  
Chronology,geochemical characteristics and petrogenesis of Late Jurassic porphyritic syenogranite in Simuke area, northern Da Hinggan Mountains
LIU Shi-wei1, SUN Guo-sheng1, WANG Qing-hai2, JIN Rui-xiang1, HE Xin1, LIU Cheng-xian1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. International Centre for Geoscience Research and Education in Northeast Asia, Jilin University, Changchun 130026, China
Abstract:

LA-ICP-MS zircon U-Pb dating and geochemical data of Simuke porphyritic syenogranite have been studied.The results indicate that the diagenetic age of porphyritic syenogranite is (144±0.85)Ma,belonging to Late Jurassic.The geochemical study shows that the porphyritic syenogranite belongs to high-K calc-alkaline series and high aluminum rocks. The rare earth elements are characterized by rich light rare earth elements and significant fractionation of LREE and HREE[(La/Yb)N=3.15~6.63].The REE distribution patterns are right deviated, with weak negative europium anomalies(δEu=0.54~0.66). For trace elements, the porphyritic syenogranites are enriched in Rb and K,but depleted in Nb,Ta,P and Ti.The porphyritic granite in Simuke area is high differentiation I type granite,derived from partial melting of basic volcanic rocks in the crust.Based on Nb-Y tectonic environment discrimination diagram and tectonic environment,combined with the characteristic of I type granite,the porphyritic granite in Simuke area should be the product of extensional tectonic system and it is formed in post-orogenic extensional tectonic environment.

Keywords: Late Jurassic   zircon U-Pb ages   geochemistry   petrogenesis   porphyritic syenogranite   Simuke   Da Hinggan Mountains  
收稿日期 2016-12-03 修回日期 2017-03-07 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2017.02.008
基金项目:

内蒙古自治区鄂伦春自治旗马布拉其汗等三幅1∶5万区域矿产地质调查(NMKD2014-38).

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