| 山东省灵山岛下白垩统青山群火山地震软沉积物变形构造特征及成因机制* |
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| 引用本文： | 周瑶琪,周腾飞,张振凯,梁钊,梁文栋,王安东,于姗姗.山东省灵山岛下白垩统青山群火山地震软沉积物变形构造特征及成因机制*[J].古地理学报,2017,19(4):567-582. |
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| 作者姓名： | 周瑶琪 周腾飞 张振凯 梁钊 梁文栋 王安东 于姗姗 |
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| 作者单位： | 1.中国石油大学(华东)地球科学与技术学院,山东青岛 266580;2.中国石油大学(华东)地球化学与岩石圈动力学开放实验室,山东青岛 266580;3.米兰比可卡大学地球与环境科学系, 米兰 20126, 意大利;4.山东黄河三角洲国家级自然保护区管理局,山东东营 257091;5.中海石油研究总院,北京 100027 |
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| 基金项目： | Co-funded by the National Natural Science Foundation of China(No.41272123) and the Fundamental Research Funds for the Central Universities (No.15CX06011A) |
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| 摘 要： | 近年来,针对山东省灵山岛地区软沉积物变形构造的研究呈现热潮,但研究层位主要集中于下白垩统莱阳群的浊积岩,对下白垩统青山群未见详述。利用野外露头与镜下薄片资料,详细描述了灵山岛地区下白垩统青山群的岩性特征、岩相组合、软沉积物变形构造类型与特征,指出研究区青山群软沉积物变形构造主要宿主岩层为陆相扇三角洲沉积,其沉积水体逐渐变浅,并伴随多次火山爆发。软沉积物变形构造类型主要有负载构造、球—枕构造、泄水构造、挤入构造、水塑性褶皱、塑性砂岩团块包卷构造、火山地震落石构造和“V”型地裂缝等,形成原因主要为火山爆发引起的古火山地震作用,成因机制主要分为地震波、火山碎屑物重力及惯性作用与瞬时差异气压效应3种,这与莱阳群浊积岩层位的软沉积物变形构造主要为滑塌与构造古地震机制不同。通过分析火山碎屑流堆积层位与软沉积物变形构造发育层位的关系,建立了青山群软沉积物变形构造的分布模式,即随着与火山口距离的变化,近源易见的脆性变形逐渐消失,中源以液化软沉积物变形与塑性变形为主体,远源呈现弱的液化软沉积物变形,且软沉积物变形构造的规模与距离呈负相关。
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| 关 键 词： | 灵山岛 下白垩统 青山群 软沉积物变形构造 火山地震 |
| 收稿时间： | 26 August 2016 |
Characteristics and formation mechanism of soft-sediment deformation structures related to volcanic earthquakes of the Lower Cretaceous Qingshan Group in Lingshan Island,Shandong Province |
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| Zhou Yaoqi,Zhou Tengfei,Zhang Zhenkai,Liang Zhao,Liang Wendong,Wang Andong,Yu Shanshan.Characteristics and formation mechanism of soft-sediment deformation structures related to volcanic earthquakes of the Lower Cretaceous Qingshan Group in Lingshan Island,Shandong Province[J].Journal of Palaeogeography,2017,19(4):567-582. |
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| Authors: | Zhou Yaoqi Zhou Tengfei Zhang Zhenkai Liang Zhao Liang Wendong Wang Andong Yu Shanshan |
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| Institution: | 1.School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong;2.Laboratory of Geochemistry & Lithosphere Dynamics,China University of Petroleum(East China),Qingdao 266580,Shandong;3.Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano 20126, Italy;4.Authority of Shandong Yellow River Delta National Nature Reserve,Dongying 257091,Shandong;5.CNOOC Research Institute,Beijing 100027; |
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| Abstract: | Recently,the study on the soft-sediment deformation structures(SSDS) of Lingshan Island is a hot topic. The research is focused on the SSDS in turbidite system of the Lower Cretaceous Laiyang Group, while specific study on the SSDS in fan delta system of the Lower Cretaceous Qingshan Group is not illustrated in details. With the field outcrops and thin sections,we analyzed the lithologic characteristics,lithofacies associations, classification and characteristics of SSDS of the Lower Cretaceous Qingshan Group in the study area. A conclusion was acquired that the palaeoenvironment is a fan delta system with several volcanic eruptions,and the water became shallower gradually. The types of SSDS include load structure,ball and pillow structure,water escape structure, sediment-injection structure,hydroplastic deformation,plastic sandstone breccia,volcanic drop stone and “V”shaped ground fissure. They were mainly caused by volcanic earthquakes of three types: seismic wave,the gravity and inertia effect of pyroclastic deposition and instant differential air pressure,which are different from the slumping and tectonic earthquake occurred in the Laiyang Group. In addition,with the analysis of association between the pyroclastic flows and the SSDS horizons,a distribution model of SSDS related to volcanic earthquake can be built: The types of SSDS range gradually with the variation of distance from volcanic vent. The brittle deformation structure, common type in proximal zone, disappears gradually; in the medial zone, liquefied and plastic SSDS become dominant types; while in distal zone, slightly liquefied SSDS develops. Additionally,the scale and size of SSDS is negatively correlated with the distance from the volcanic vent. |
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| Keywords: | Lingshan Island Lower Cretaceous Qingshan Group soft-sediment deformation structure volcanic earthquake |
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