| 三江盆地富锦隆起下白垩统沉积时期古环境恢复 |
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| 引用本文： | 于松,李成博,曹翰升,于健,郭巍.三江盆地富锦隆起下白垩统沉积时期古环境恢复[J].世界地质,2016,35(1):9-16. |
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| 作者姓名： | 于松 李成博 曹翰升 于健 郭巍 |
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| 作者单位： | 1. 吉林大学 地球科学学院，长春 130061; 2. 吉林省国土资源调查规划研究院，长春 130061; 3. 中国石化销售有限公司吉林天然气分公司，吉林 四平 136108 |
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| 摘 要： | 三江盆地富锦隆起下白垩统发育厚层暗色泥岩,为了恢复这套暗色泥岩的古环境,进行了系统的野外地质调查和取样分析。地球化学特征显示:Sr/Ba比值为0.08~0.20,碳氧同位素系数Z值为106.62~116.03,表明下白垩统为淡水沉积环境,盐度变化相对稳定;Ti含量为3 183×10-6~5 239×10-6,Sr/Cu比值为2.53~35.84,Fe/Mn比值为21.15~96.95,表明下白垩统处在温暖湿润的气候条件下;Cu/Zn比值为0.09~0.21,V/V+Ni比值为0.77~0.81,Ce的异常指数为-0.06~0.01,表明下白垩统处在还原环境中。孢粉化石特征显示:Protopodocarpus sp.(原始罗汉松粉未定种)、Aratrisporites fischeri(Klaus)Playford et Dettmann(弗歇尔离层单缝孢)等所指示的植物生长环境为温暖湿润的气候环境。烃源岩元素地球化学特征指示该套地层具有较好的生气前景,温暖湿润的还原环境为有机质生成提供了良好的条件。
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| 关 键 词： | 三江盆地 富锦隆起 下白垩统 地球化学特征 古环境恢复 |
Paleoenvironmental reconstruction of Lower Cretaceous in Fujin uplift of Sanjiang Basin |
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| YU Song,LI Cheng-Bo,CAO Han-Sheng,YU Jian,GUO Wei.Paleoenvironmental reconstruction of Lower Cretaceous in Fujin uplift of Sanjiang Basin[J].World Geology,2016,35(1):9-16. |
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| Authors: | YU Song LI Cheng-Bo CAO Han-Sheng YU Jian GUO Wei |
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| Institution: | 1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. Land Ｒesources Survey and Planning Ｒesearch Institute of Jilin Province，Changchun 130061，China; 3. Jilin Natural Gas Branch，China Petrochemical Marketing Co． ，Siping 136108，Jilin，China |
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| Abstract: | Based on systematic geological survey and sampling analysis，this paper restores the palaeoenviron- ment of dark mudstone of Lower Cretaceous largely developed in Fujin uplift of Sanjiang Basin． The geochemical characteristics show that ratio of Sr/Ba varies from 0. 08 to 0. 20 and coefficient of carbon and oxygen isotopes va- ries from 106. 62 to 116. 03，which indicates the Lower Cretaceous developed in a freshwater sedimentary environ- ment with stable salinity． Content of Ti varies from 3 183 ×10 －6 to 5 239 ×10 －6 ，ratio of Sr/Cu varies from 2. 53 to 35. 84 and ratio of Fe/Mn varies from 21. 15 to 96. 95，which indicates the Lower Cretaceous developed under warm humid climate conditions． And，ratio of Cu/Zn varies from 0. 09 to 0. 21，ratio of V/ (V + Ni) varies from 0. 77 to 0. 81 and abnormal index of Ce varies from －0. 06 to 0. 01，which indicates the Lower Cretaceous devel- oped in a reducing environment． The palynological fossils，Protopodocarpus sp． and Aratrisporites fischeri (Klaus) Playford et Dettmann indicate warm and humid environment for the plants growing． Geochemical characteristics of source rocks indicate a prospect for gas generation，and the warm and humid reductive environment provided fa- vourable condition for organic matter． |
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| Keywords: | Sanjiang Basin Fujin uplift Lower Cretaceous geochemical characteristics paleoenviron- ment reconstruction |
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