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黑龙江东南部穆棱地区“麻山群”的特征及花岗岩锆石SHRIMP U-Pb定年——对佳木斯地块最南缘地壳演化的制约
引用本文:颉颃强,苗来成,陈福坤.黑龙江东南部穆棱地区“麻山群”的特征及花岗岩锆石SHRIMP U-Pb定年——对佳木斯地块最南缘地壳演化的制约[J].地质通报,2008,27(12).
作者姓名:颉颃强  苗来成  陈福坤
作者单位:1. 中国地质科学院地质研究所北京离子探针中心,北京100037;中国科学院地质与地球物理研究所,北京100029
2. 中国科学院地质与地球物理研究所,北京,100029
3. 中国地质科学院地质研究所北京离子探针中心,北京,100037
基金项目:国家自然科学基金(编号:40473030、40525007)和中国科学院知识创新工程项目(编号:KZCX2-104)
摘    要:通过对佳木斯地块南缘穆棱地区常兴村-新兴村剖面的研究,指出这里是“麻山群”和“黑龙江群”的结合部位,具有古大陆边缘性质。穆棱地区的“麻山群”为佳木斯地块南缘的陆壳基底,其南侧的“黑龙江群”为包括洋壳残片在内的增生-碰撞杂岩。对“麻山群”混合岩的SHRIMP锆石U-Pb定年结果表明:佳木斯地块存在中-新元古代的结晶基底,并遭受到~500Ma变质作用的影响。侵入“麻山群”杂岩的花岗岩的岩石学、地球化学研究表明,这些花岗岩具有S型花岗岩的特征;其SHRIMP锆石U-Pb分析表明其形成年龄为486Ma±3Ma,略晚于前人确定的“麻山群”杂岩约500Ma的麻粒岩相变质作用,为同碰撞或碰撞后花岗岩。这些资料进一步证明,该地区可能经历了晚泛非-早加里东期的碰撞造山作用。

关 键 词:佳木斯地块  基底  SHRIMP锆石U-Pb定年  S型花岗岩  穆棱地区

Characteristics of the "Mashan Group"and zircon SHRIMP U-Pb dating of granite in Muling area,southeastern Heilongjiang Province,China:constrains on crustal evolution of the southernmost of Jiamusi Massif
XIE Hang-qiang MIAO Lai-cheng CHEN Fu-kun.Characteristics of the "Mashan Group"and zircon SHRIMP U-Pb dating of granite in Muling area,southeastern Heilongjiang Province,China:constrains on crustal evolution of the southernmost of Jiamusi Massif[J].Geologcal Bulletin OF China,2008,27(12).
Authors:XIE Hang-qiang MIAO Lai-cheng CHEN Fu-kun
Institution:Beijing SHRIMP Center, Chinese Academy of Geological Sciences
Abstract:According to the geological profile from Changxingcun to Xinxingcun in Muling, south of Jiamusi Massif, we suggest that assemblage of formations there shows features of paleo active continental margin. The Mashan Group is the basement of Jiamusi Massif, whereas the Heilongjiang Group represents an accretionary-collision complex containing remnants of oceanic crust. Zircon SHRIMP U-Pb dating on the migmatite from Mashan Group indicates that there is Mesoproterozoic-Neoproterozoic basement in Jiamusi Massif and it has been influenced by ~500Ma metamorphism. The petrological and geochemical studies on the granite, which intruded the Mashan Group, suggest that they are of affinity of S-type granites. The SHRIMP U-Pb dating indicates that the emplacement of granite occurred in Late Cambrian, with a weighted mean age of 486Ma±3Ma, slightly later than previously defined ~500Ma granulite-facies metamorphism of the Mashan Group. Therefore, these granites are syn- or post-collisional intrusive rocks. These data confirmed that the study area underwent a late Fan-African-Early Caledonian collisional orogenesis.
Keywords:Jiamusi massif  basement  SHRIMP zircon U-Pb dating  S-type granite  Muling area
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