| 蒙古国塔木察格盆地塔南凹陷铜钵庙组火山碎屑岩中片钠铝石胶结物的成因 |
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| 引用本文： | 董林森,刘立,蒙启安,张革,王力娟,赵爽,周冰.蒙古国塔木察格盆地塔南凹陷铜钵庙组火山碎屑岩中片钠铝石胶结物的成因[J].吉林大学学报(地球科学版),2011,41(2):421-431. |
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| 作者姓名： | 董林森 刘立 蒙启安 张革 王力娟 赵爽 周冰 |
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| 作者单位： | 1.吉林大学 地球科学学院,长春130061；
2.大庆油田有限责任公司 勘探开发研究院,黑龙江 大庆163712 |
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| 基金项目： | 国家自然科学基金项目(40972075);教育部高等学校博士学科点专项科研基金项目(20090061120043);吉林大学研究生创新研究计划项目(20101062) |
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| 摘 要： | 塔木察格盆地塔南凹陷铜钵庙组火山碎屑岩中发育大量的片钠铝石自生矿物。通过偏光显微镜、扫描电镜及X射线衍射分析等，查明了火山碎屑岩中的胶结物与自生矿物类型和成岩共生序列。含片钠铝石火山碎屑岩的成岩共生序列为粘土包壳-方解石-一期微晶石英-一期高岭石-二期微晶石英、二期高岭石、片钠铝石-铁白云石;通过MAT253稳定同位素质谱仪确定了片钠铝石和铁白云石的稳定同位素组成为片钠铝石的δ13CPDB为-8.15‰~-2.81‰，与片钠铝石平衡的CO2的δ13CCO2为-12.91‰~-7.55‰，通过与海拉尔盆地及BGS盆地系碳氧同位素数据的类比，表明片钠铝石中的碳主要为幔源岩浆来源，形成片钠铝石的钠和铝主要来源于安山岩岩屑、长石晶屑碎屑、玻屑和火山灰等;铁白云石的δ13CPDB为-6.76‰~-2.65‰，与片钠铝石的碳氧同位素数据相似，结合相关地质实例及地球化学模拟实验，可以推断铁白云石中的碳也是幔源岩浆来源，铁白云石中的铁离子主要来源于安山岩岩屑、玻屑、火山灰和蒙脱石等矿物。
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| 关 键 词： | 片钠铝石 铁白云石 成因 火山碎屑岩 塔木察格盆地 矿物学 |
| 收稿时间： | 2010-11-05 |
Generation of Dawsonite Cement of Pyroclastic Rocks in Tongbomiao Formation in Tanan Sag of Tamtsag Basin in Mongolia |
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| DONG Lin-sen,LIU Li,MENG Qi-an,ZHANG Ge,WANG Li-juan,ZHAO Shuang,ZHOU Bing.Generation of Dawsonite Cement of Pyroclastic Rocks in Tongbomiao Formation in Tanan Sag of Tamtsag Basin in Mongolia[J].Journal of Jilin Unviersity:Earth Science Edition,2011,41(2):421-431. |
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| Authors: | DONG Lin-sen LIU Li MENG Qi-an ZHANG Ge WANG Li-juan ZHAO Shuang ZHOU Bing |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun130061, China；
2. Exploration and Development Research Institute, Daqing Oilfield Ltd Co., Daqing163712|Heilongjiang, China |
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| Abstract: | Dawsonite cement is abundant in pyroclastic rocks in Tongbomiao Formation in Tanan sag of Tamtsag basin in Mongolia. The types, diagenetic sequence of cements and authigenic minerals of dawsonite-bearing pyroclastic rocks are investigated by palarizering microscope, SEM and X-ray diffraction. Their diagenetic sequence is clay coating cementation-calcite-early microcrystalline quartz cementation-early kaolinite cementation-dawsonite cementation, later microcrystalline quartz cementation, later kaolinite-ankerite cementation. The stable isotope compositions of dawsonite and ankerite are investigated by MAT253 stable isotope mass spectrometer. Dawsonite δ13C values range from -8.15‰ to -2.81‰, and the calculated values of CO2 gas in isotopic equilibrium with dawsonite range from -12.91‰ to -7.55‰, with analogy of Hailaer basin and BGS basins, which show that CO2 for forming dawsonite almost from mantle-magma, and andesite debris, crystal feldspar and detrital feldspar, vitric debris and volcanic ash supplying Na+ and Al3+.Ankerite δ13C values range from -6.76‰ to -2.65‰,which are similar with dawsonite, with related geological and geochemical simulation examples, which note that CO2 for forming ankerite also from mantle-magma. Andesite debris, vitric debris, volcanic ash and montmorillonite which contain ferrum supply metal ions for the formation of ankerite. |
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| Keywords: | dawsonite ankerite generation pyroclastic rock Tamtsag basin mineralogy |
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