| 饶河地区大岭桥组沉积环境恢复及其地质意义 |
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| 引用本文： | 于健,郭巍,王少华,林斌.饶河地区大岭桥组沉积环境恢复及其地质意义[J].世界地质,2015,34(1):113-119. |
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| 作者姓名： | 于健 郭巍 王少华 林斌 |
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| 作者单位： | 1. 吉林大学 地球科学学院，长春 130026; 2. 陕西省核工业地质调查院，西安 710199 ; 3. 天津博天科技有限公司，天津 300040 |
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| 摘 要： | 饶河地区以大面积发育的深海相地层为特征,主要由含放射虫的深海硅质岩和铁镁质--超铁镁质杂岩组成。在饶河地区野外研究工作中发现大岭桥组剖面中出露灰绿色泥岩、粉砂质泥岩夹紫红色泥岩岩性组合,该地层与完达山造山带深海相混杂岩特征明显不同。通过大岭桥组泥岩元素地球化学分析,恢复了大岭桥组沉积时期古环境,并探讨了其成因意义。根据Sr/Ba、B/Ga比值以及B含量特征认为大岭桥组具有陆相淡水沉积特征;Fe3+/Fe2+、Cu/Zn、V/Cr比值表明古环境条件为氧化条件;Sr/Cu、Fe/Mn比值及Ti含量特征指示气候条件温暖湿润。研究结果表明,这套地层不属于洋壳性质的外来地体,而是佳木斯地块东缘的沉积层系。
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| 关 键 词： | 饶河地区 大岭桥组 沉积环境恢复 地质意义 |
Ｒeconstruction of depositional environment of Dalingqiao Formation in Ｒaohe area and its geological significance |
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| YU Jian,GUO Wei,WANG Shao-Hua,LIN Bin.Ｒeconstruction of depositional environment of Dalingqiao Formation in Ｒaohe area and its geological significance[J].World Geology,2015,34(1):113-119. |
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| Authors: | YU Jian GUO Wei WANG Shao-Hua LIN Bin |
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| Institution: | 1. College of Earth Sciences，Jilin University，Changchun 130026，China; 2. Shaanxi Nuclear Industry Geology Surveying Institute，Xi'an 710199，China; 3. Tianjin Bo- tian Technology Company Limited，Tianjin 300040，China |
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| Abstract: | Ｒaohe is characterized by a large area of deep oceanic strata which are composed of radiolarian sili- calites and mafic- ultramafic complex． In the field work in Ｒaohe，we discovered that the lithological association of grey- green mudstone，silty mudstone and claret- colored mudstone developed in the outcrops of Dalingqiao Formation，which are obviously different from Wandashan orogenic belt characterized by deep oceanic complex． We intend to reconstruct the depositional environment and discuss the geological significance of the Dalingqiao Formation in Ｒaohe area by means of element geochemical analysis． According to the ratios of Sr/Ba，B/Ga and the content of B，we consider that the Dalingqiao Formation is featured by fresh water sediment． The ratios of Fe3 + /Fe2+ ， Cu/Zn，V/Cr indicate that the paleoenvironment was in oxydiec condition． The ratios of Sr/Cu，Fe/Mn and the content of Ti indicate that the paleoclimate was warm and humid． These results indicate that the strata not belong to an allochthonous geological terrain with oceanic crust in nature，but belong to the sedimentary strata of eastern Jiamusi massif． |
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| Keywords: | Ｒaohe area Dalingqiao Formation reconstruction of depositional environment geological significance |
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