[an error occurred while processing this directive] 世界地质 2019, 38(4) 900-909 DOI:   10.3969/j.issn.1004-5589.2019.04.002  ISSN: 1004-5589 CN: 22-1111/P
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巴龙贡噶尔组
片岩
锆石U-Pb年龄
新元古代
本文作者相关文章
潘建
李贵义
李广铁
PubMed
Article by Pan J
Article by Li G
Article by Li G
青海省巴龙贡噶尔组的重新划分及地质意义
潘建, 李贵义, 李广铁
吉林省区域地质矿产调查所, 长春 130022
摘要： 南祁连阳康地区分布着一套变形较强的区域低温动力变质岩系，前人将其划归为巴龙贡噶尔组。通过对该套地层进行岩石地球化学、锆石LA-ICP-MS U-Pb年代学研究，发现其与巴龙贡噶尔组的原始含义不同，对该地层中不同的岩石组合重新进行了划定，其主要由两部分组成：其中的变质砂岩、变质粉砂岩和板岩等变质变形较弱，与巴龙贡噶尔组的原始含义相吻合，时代为志留纪；而其中的片岩类岩石，变质变形较强，恢复原岩为火山岩和火山碎屑岩，SiO2含量为57.1%~68.74%，Al2O3 13.04~14.98%，Al2O3 > （K2O+Na2O+CaO）（分子数） > 1，里特曼指数（σ）在1.4~4.42之间，大多在2±，主要为钙碱性系列。稀土总量∑REE=186.17×10-6~203.79×10-6，稀土元素球粒陨石标准化模式曲线为向右倾斜的轻稀土富集型，铕略亏损，具负异常，亲石元素Ba和Sr富集，而Rb强烈亏损，Ba相对Rb和Th、Ti相对于Sm和Y呈明显负异常，反映出具有典型中基性-中酸性火山岩微量元素特征。在火山岩中获取锆石U-Pb测年结果表明其岩浆形成的时代为新元古代（819±2 Ma）（阳康片岩），为一套基性火山岩及火山碎屑岩建造，具有大陆裂谷盆地的特点，该片岩的发现填补了该区域未有新元古代历史记录的空白，反映了该地区与全球元古代Rodinia超大陆聚合事件的一致性。
关键词： 巴龙贡噶尔组   片岩   锆石U-Pb年龄   新元古代  
Re-division of Balonggonggaer Formation in Qinghai Province and its geological significance
PAN Jian, LI Gui-yi, LI Guang-tie
Regional Geological and Mineral Resources Survey of Jilin Province, Changchun 130022, China
Abstract: A set of highly deformed regional low-temperature dynamic metamorphic rocks occurs in Yangkang area of South Qilian, which was classified as the Balonggonggaer Formation by predecessors. Through petrogeo-chemistry and zircon LA-ICP-MS U-Pb chronology of the strata, it is found that the characteristics of this set of rocks is different from the original definition of Balonggonggaer Formation. The rock assemblages in this set of rocks are thus re-delineated, which are mainly composed of two parts. The metamorphic sandstone, metamorphic siltstone and slate show weak metamorphic deformation, which coincides with the original definition of the Balonggonggaer Formation. The age is Silurian. However, the schists have strong metamorphic deformation, and the restored origi-nal rocks are volcanic rocks and volcanic clastic rocks. The content of SiO2 ranges from 57.1% to 68.74%, Al2O3 ranges from 13.04% to 14.98%, Al2O3 >(K2O + Na2O + CaO) (number of molecules) greater than 1, and the Ritman index (σ) ranges from 1.4 to 4.42, with most around 2. The rocks mainly belong to calc-alkaline series. The total REE is 186.17×10-6~203.79×10-6. The standard model curve of REE chondrite shows a right-lean-ing LREE enrichment with slight Eu deficiency and negative anomaly. The lithophile elements Ba and Sr are en-riched, while Rb is strongly depleted. Ba is obviously negative relative to Rb and Th, Ti is obviously negative rela-tive to Sm and Y. It indicates the trace element characteristics of typical intermediate-basic to intermediate-acid volcanic rocks. Zircon U-Pb dating from volcanic rocks shows that the magma was formed in the Neoproterozoic (819±2 Ma) (Yangkang schist), which is a set of basic volcanic rock and pyroclastic rock formation with the characteristics of continental rift basin. The schist identified in this study is the first record of Neoproterozoic in this region, which indicates the consistency with global Proterozoic Rodinia supercontinent convergence event.
Keywords: Balonggonggaer Formation   schist   zircon U-Pb age   Neoproterozoic  
收稿日期 2019-04-01 修回日期 2019-07-15 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2019.04.002
基金项目:

青海省地质勘查基金项目（青国土资矿[2011]277号）

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