排序方式: 共有75条查询结果,搜索用时 93 毫秒
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以湖北万山井水温观测资料为研究对象,探究井内深度215 m和241.58 m处的水温动态特征及其主要干扰因素和映震能力。通过水温梯度分析和水温正常动态对比研究,认为:在井深215 m处,水温动态为稳定型;在井深241.58 m处,水温长期动态为升温漂移型,月动态为上升-阶变型,日动态为随机起伏型,升温漂移是仪器自身的零漂现象,随机起伏反映了仪器自身噪音或者对应井水温的随机变化。对水温主要干扰因素的分析表明,井深241.58 m处的水温异常主要来自人为干扰引起的井水震荡和探头线扰动,异常形态均表现为单个台阶或突跳。在2018年9月8日湖北襄阳襄城ML 3.2地震前后,该深度处水温均呈高频V型阶变异常,此为地震发生前后区域应力积累与释放对井水温的作用所致。 相似文献
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JIANG Shaoyong LIU Tao ZHANG Haoxiang CAO Shuyun ZHENG Ruohong LI Tongguo YU Junpeng WU Yibu 《《地质学报》英文版》2022,96(5):1471-1483
The Yusishan deposit is a newly found leptynite-type niobium and tantalum (Nb-Ta) deposit, which is located in the Eastern Altun of Gansu Province. The leptynite of the Neoproterozoic Aoyougou Formation occurs more than 10 km long and 3 km wide. In this paper, we carried out a detailed study of the leptynite and related mineralization. The U-Pb dating of zircon reveals ages of 831 ± 5 Ma and 790 ± 5 Ma for the unmineralized leptynite and 491 ± 4 Ma and 455 ± 4 Ma for the mineralized leptynite. The petrographic and geochemical evidence identified the protolith of the leptynite as alkaline volcanic rocks that erupted during Neoproterozoic at ca. 830 Ma. At ca. 490 Ma, the tectono-magmatic and metamorphic event triggered remobilization and enrichment of Nb-Ta as well as other critical metals (REE, Zr, Hf etc) with the formation of industry orebodies in the leptynite strata. The Yushishan deposit presents many similarities with the alkaline volcanic rocks related rare metal deposits in the south Qinling of China and the Brochman, Toogni and Southern Peak Range deposits in Australian. We therefore propose that the Yushishan deposit is a new type (sub-type) of Nb-Ta deposit and termed as leptynite type that represents the metamorphic counterpart of the alkaline volcanic rocks related rare metal deposits. 相似文献
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Organochlorine pesticides (OCPs) in soils and sediments, southeast China: A case study in Xinghua Bay 总被引:5,自引:0,他引:5
This study evaluated the contamination status and distribution of organochlorine pesticides (OCPs) between Xinghua Bay and adjacent watersheds in Putian region, southeast China. Twenty-five surface soil samples and two sediment cores were collected from two watersheds and the Xinghua Bay, respectively. Results showed that the concentrations of OCPs in samples of the Mulan River Watershed (MRW), the Qiulu River Watershed (QRW), the inner bay core (IBC) and the open bay core (OBC) were in the range of 4.96-38.20 ng/g, 4.62-22.80 ng/g, 1.84-80.46 ng/g and 1.87-23.43 ng/g, respectively. The mean concentration of OCPs was in an order: IBC > MRW > QRW > OBC. The higher concentration of OCPs in recent periods may suggest that a certain amount of OCPs were still input to this area. 相似文献
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位于西秦岭西段夏河—合作金成矿带的德乌鲁岩体内外接触带金多金属成矿区,主要包括以地南、老豆、下看木仓、吉利及老虎山―阿什加等金矿床(点),其中以地南是德乌鲁岩体近年新探明的一处大型金矿。它们的成矿地质特征基本相似,矿床均产于岩体内外接触带,矿体呈脉(板)状、透镜状,严格受断裂破碎蚀变带控制。矿床的S-H-O-B稳定同位素组成特征表明,成矿物质和成矿流体主要来源于岩浆活动。LA-ICP-MS锆石U-Pb年龄显示,德乌鲁石英闪长岩和老豆石英闪长斑岩的锆石加权年龄分别为(238.6±1.3)Ma和(247.6±1.3)Ma;与金矿化紧密共生的绢云母40 Ar/39 Ar坪年龄为(248±3~249.9±2.7)Ma,成岩与成矿时代接近。岩石元素地球化学特征表明,这两类岩石地球化学性质相似,均为富碱、偏铝质、轻稀土元素富集、Eu中等到弱负异常、富集大离子亲石元素、亏损高场强元素,属于较典型的Ⅰ型花岗岩,具有活动大陆边缘弧岩浆地球化学属性。岩石的Sr-Nd同位素组成(87 Sr/86 Sr)=0.702~0.704,暗示其源区主要为富钾的基性下地壳,并有幔源物质加入。研究结果表明,成岩和成矿作用均发生于印支期,成矿作用可能与区域逆冲-推覆作用及相伴生的酸性岩浆侵位密切相关,矿床成因类型为岩浆热液成因。区域内构造发育,岩浆活动频繁,金多金属矿床(点)分布广泛,金资源潜力大,找矿前景良好。 相似文献
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北斗/GNSS实时动态差分技术(RTK)已广泛地应用于工程勘测、数字测图、施工放样等工程领域。但对于初学者,尤其是青年学生在北斗/GNSS RTK基准站设置、移动台坐标推算与坐标转换的理论理解和实践操作方面,仍然存在较多疑惑和理解偏差,导致实验教学效果不佳。鉴于此,作者根据多年一线的科研教学实践和对北斗/GNSS理论理解的基础上,结合易于理解的导线测量技术,剖析北斗/GNSS RTK技术与导线测量在基线向量/坐标增量解算方面的异同之处,诠释北斗/GNSS RTK起始坐标的获取与坐标转换参数的配置问题。最后,通过实例验证北斗/GNSS RTK技术在当前可满足cm级的测设精度要求。 相似文献
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辽宁本溪地区为我国重要的鞍山式铁矿富集区,研究该地区含铁建造的显微构造变形机制,对系统研究区内含铁建造的沉积演化过程具有重要意义。研究表明,该处岩石经历了2期强烈韧性变形作用改造,依据重结晶作用类型和主要显微结构,变形作用发生在绿片岩岩相条件下。利用古差值应力大小测量,确定该地区含铁建造岩石变形古应力值为27.36~36.88 MPa;剪应变值在11.342~18.555 MPa之间,并具有左旋剪切性质。 相似文献
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随着测绘地理信息行业的快速发展,信息化建设工作对行业管理提出了更高的要求.本文设计开发了基于WebGIS在线天地图图幅管理、J2EE业务建模平台和B/S模式架构的生产管理系统,在"一张图"模式下实现工作流控制、组织机构、权限管理、生产计划管理等功能,进而实现生产业务流转自动化,管理信息化、智能化、可视化,生产进度汇报自动化,质量控制清晰化. 相似文献