%0 Journal Article
%T 兴安地块中部奥陶纪构造沉积环境<br>Tectonic and Sedimentary Environment in the Ordovician Period of Central Xing an Block
%A 陈安霞
%A 周多
%A 张庆奎
%A 关培彦
%A 杨宾&lt
%A br&gt
%A CHEN Anxia
%A ZHOU Duo
%A ZHANG Qingkui
%A GUAN Peiyan
%A YANG Bin
%J 现代地质
%D 2016
%X 摘要： 兴安地块奥陶纪构造沉积环境受到地质界的广泛关注。在区域地质调查工作的基础上，首先对红花尔基地区碎屑岩及萨其图地区火山岩进行研究，结果显示研究区西部奥陶纪为与岛弧作用有关的构造沉积环境；进而通过一系列的层序地层对比，研究分析兴安地块中部奥陶纪的构造沉积环境及演化过程。结果表明：研究区奥陶纪为一个北西向倾斜、北东向延伸的斜坡，哈拉哈河组沉积期沿斜坡发育一套海侵的滨-浅海相碎屑岩，由南东向北西沉积环境由滨海过渡为浅海；多宝山组岛弧火山岩广泛发育，靠近岛弧区发生隆升形成扎兰屯-多宝山岛弧的西南向延伸部分，远离岛弧地区发生弧后沉降作用，局部发育含放射虫硅质岩；裸河组沉积期岛弧作用停止，原岛弧区发生沉降回返，研究区转为碎屑岩沉积，后经过多期地壳抬升-沉降-抬升的幕式运动，最终暴露地表遭受剥蚀。<br>Abstract: The tectonic sedimentary environment in the Ordovician Period of central Xing an Block is attracted widespread attention by geologists. On the basis of regional investigation work, the arc and arcback environment of the study area was firstly verified by the clastic rocks in Toudaoqiao area and invasion rocks in Saqitu area. Then the sedimentary environment and its evolution were introduced in detail through a series of sequence stratigraphic correlation in central Xingan Block during Ordovician. The conclusion showed that there was a slope tilted to NE direction and extended to NE direction in the Ordovician period. A series of shoreshallow sea transgressive clastic rocks were found in Halahahe Formation along the slope. The arc volcanic rocks developed extensively in Duobaoshan Formation. The uplift near the island arc contributed to the SWdirection extension parts of the ZhalantunDuobaoshan arc island. The subsidence appeared far from the island arc, and radiolarian cherts were found locally. The island arc progress was over, and the subsidence and clastic rock appeared again during the sedimentation of Luohe Formation. After several times of uplift and subsidence of the crust, the study area was exposed and denuded finally
%K 构造环境
%K 岛弧
%K 沉积相
%K 层序
%K 多宝山组
%K 兴安地块
%K tectonic environment
%K arc
%K sedimentary facies
%K succession of stratum
%K Duobaoshan Formation
%K Xingan block
%U http://www.geoscience.net.cn/CN/abstract/abstract13879.shtml