Shaking and splashing—A case study of far-field effects of the Mjølnir asteroid impact on depositional environments in the Barents Sea

The Mjølnir impact crater in the Norwegian Barents Sea features among the 20 largest impact craters listed in the Earth Impact Database. The impact is dated to 142 ± 2.6 Ma, corresponding closely to the Jurassic/Cretaceous boundary in the Boreal stratigraphy. Multidisciplinary studies carried out over the last three decades have suggested that the up to 40 km wide crater was created by a 1–3 km diameter impactor colliding with a shallow epicontinental sea, causing regional havoc and a regional ecological crisis that followed in its wake. Only minor evidence for the consequences of the impact for the surrounding depositional basins has been documented so far. This study describes a large submarine slump penetrated by hydrocarbon exploration well 7121/9-1, located in the southern Hammerfest Basin and approximately 350 km away from the impact site. The slump is dated by a black shale drape, which contains characteristic impact-related biotic assemblages and potential ejecta material. This precise dating enables us to associate the slump with large-scale fault movements and footwall collapse along the basin-bounding Troms-Finnmark Fault Complex, which we conclude were caused by shock waves from the Mjølnir impact and the passage of associated tsunami trains. The draping black shale is interpreted to represent significant reworking of material from the contemporary seabed by tsunamis and currents set up by the impact.     

祁连山东段庄浪河流域地貌特征及其构造指示意义

晚新生代以来,青藏高原北东向扩展,致使祁连山地区遭受了强烈的构造隆升,造就了祁连山地区复杂的构造格局和急剧变化的构造地貌,其典型水系流域地貌特征揭示了该地区的新构造活动和地貌演化过程。庄浪河流域位于祁连山东段,作为青藏高原北东向扩展的前缘地区,庄浪河流域的地貌参数对构造活动非常敏感,提取庄浪河流域的地貌信息,有助于揭示祁连山东段庄浪河流域地貌对构造活动的响应,及系统探讨该区地貌发育特征及其所蕴含的构造意义。庄浪河流域内及边缘发育有庄浪河断裂、天祝盆地南缘断裂、疙瘩沟隐伏断裂以及金强河-毛毛山-老虎山断裂。晚新生代以来,这些断裂仍在活动,并且控制着流域内的构造变形、山体隆升和河流水系地貌发育。本研究采用ALOS DEM 12.5 m数据,基于ArcGIS空间分析技术,通过高程条带剖面、河流坡降指标体系（K,SL,SL/K）和Hack剖面、面积-高程积分值（HI）和积分曲线（HC）等方法,对庄浪河流域地貌特征进行了初步分析。结果表明,庄浪河地区地形起伏由北西向南东递减,构造活动存在东西分异的规律;庄浪河流域内部K值、SL、SL/K、HI值西侧高于东侧,Hack剖面西侧相比东侧上凸更明显;H...     

山东福吉山铜矿构造控矿因素分析

福吉山铜矿成矿地质特点不同于山东已有的铜矿类型,属于构造热液成因类型。近SN向的平移断裂同时具有张扭性和压扭性双重力学性质,其中张扭性破碎带造就成矿空间,造成了矿体近等间距雁列式排列。受断裂构造的影响,矿区内节理、裂隙发育,为成矿热液的运移和积聚提供了良好的空间。区内沿裂隙充填形成的石英脉、褐铁矿脉、铜矿脉发育。     

焦家断裂带上朱郭李家矿区地质环境现状与趋势分析

位于焦家断裂成矿带上的朱郭李家矿山建设规模为大型,矿区地质环境条件较为复杂,矿山开采对矿山地质环境的影响主要是对土地、植被资源以及地下含水层的破坏。借鉴周边同类生产矿山对成矿带区域地质环境的影响,对朱郭李家矿区地质环境现状和发展趋势进行了分析研究,为投产后的朱郭李家矿区,乃至焦家断裂成矿带区域地质环境地质保护与治理提供依据。     

平湖油气田主断裂西部烃源评价及油源对比

平湖油气田主力含油气区位于平湖主断裂以东区域,油源主要来源于东部生烃凹陷的半封闭海湾暗色泥岩和煤层.公司于2011年11月在主断裂西部钻了一口探井XY井,目的是为探测主断裂西部含油气情况,扩大油气储量.结果钻遇油气层12m,测试获日产气14.66×104m3,日产油107.8 m3,取得了一定突破.为进一步评价西部含油气规模,钻后进行了油源对比研究,认为西部的油气主要是东部运移聚集的结果,西部源岩也有一定贡献.西部有形成一定规模油气藏的潜力.     

基于关联规则的故障诊断方法研究

提高自动气象站设备运行能力和观测数据的质量状况成为影响气象预测预报服务的准确性和气象事业发展的关键。然而中国现在业务运行的自动气象站设备并没有内置的故障检测装置,也没有完善的自检系统。但是气象要素(温湿压风雨)的变化往往是相互关联的,为了提高自动气象站数据质量,及时有效地判断设备故障。从大量观测数据试验结果进行研究,提出一种基于关联规则的故障综合诊断方法。通过使用Apriori挖掘算法,得到各气象要素及其变化量之间的强关联规则,通过实际观测数据验证2012年7月26日08时江西南昌站湿度传感器发生故障。     

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CINRAD/CD天气雷达因-600伏电源引起的回波异常故障排查

通过接收机放电管-600伏电源软故障引起的CINRAD/CD天气雷达回波信噪比低,回波异常故障的分析,找到故障产生的原因,提出相应应急处理方法。