腾冲火山构造区马站岩浆囊地球物理特征的再探讨          下载免费PDF全文

姜枚  谭捍东  彭淼  钱荣毅  张聿文  李庆庆  张立树  许乐红  郭帅 《中国地质》2016,(5):1688-1696

云南腾冲火山盆地深部存在岩浆囊是人们关注的问题,多方面进行了大量的研究且存在不同意见。作者此前依据低电阻异常推断出位于小空山、大空山、黑空山等火山口的下部,深13~30 km范围内东西向25 km,南北向30km的低电阻率的岩浆囊,其东侧为大盈江断裂。文章利用反射地震、重力、航空磁测资料进一步探讨了岩浆囊的其他地球物理特征。由于火山喷发,不仅在火山口附近形成了局部物质亏损,而且,岩浆囊本身也亏损了岩浆物质,在重力上延图中滤去了表层的火山局部负重力异常后,呈现出大空山北侧的与低阻体相对应的负重力异常,这与岩浆囊高温熔融状态含水低密度物质有密切关系。整体的重力负异常印证了低阻岩浆囊的存在。腾冲马站岩浆囊的温度为397~651°C,平均温度为524°C,其主体中心部位不可能存在磁性体。对航磁资料的处理,消除表层火山岩影响后,仍然发现有较强磁异常,其平面投影范围与低阻体相近,推断磁异常是岩浆囊顶层,在15 km深度以上范围内,随着岩浆囊体温度逐步下降,当低于480°C以后会形成新的铁磁性矿物,因此,在囊体上层出现了范围与囊体相近的较强的磁性体。反射地震仅仅在浅部较清楚地观测到较连续的反射波界面,是浅部火山岩、含水层、以及花岗岩顶界面的反映。向深部反射界面很不连续推测是由于多次岩浆上涌,其喷发时间有先后,成分有差异,故岩浆囊物质的不均匀性,虽然由于含水、矿化、熔融体构成了低电阻的共性,可温度的不均匀,却又显示了不同期次岩浆成分有变化,由岩浆囊向地表的通道上,东部花岗岩下为高速,相对于较低温度的物质,在小空山、大空山和黑空山深部沿大盈江断裂带有东西两个大的隐伏花岗岩体之间是最新的火山喷发通道,具有相对低速的通道。  相似文献   

一种底座式ADCP流量自动监测探头支撑装置的研制与应用          下载免费PDF全文

刘正伟  陆德智  朱云武  陈明德  张丽花 《水文》2016,36(2):82-84

在流量自动监测系统中,底座式ADCP设备探头位于河底,维修极为不便。该研制装置采用304不锈钢支架配合滑轮、钢索、绞盘等手摇传动系统,将底座式ADCP设备探头从河底传送到水上岸边检修台,实现对设备探头的维护、检修、更换、安装、调试等操作,再通过该装置将底座式ADCP设备探头传送到河底原位,经十里长街等站实际应用,运行稳定可靠,运用极为方便;该装置防磁、防锈、防腐性能良好,为底座式ADCP探头提供一个很好的工作环境,且结构简单,运输方便,可作为中小河流永久流量自动监测站装置使用。  相似文献   

城市生活垃圾卫生填埋场沉降变形分析          下载免费PDF全文

王汉席  刘勇  徐建玲  任贺  杨淼 《探矿工程》2016,43(2):73-77

城市生活垃圾填埋场地基沉降和垃圾堆体沉降受到的影响因素多,现行规范的计算方法直接采用与实际相差较大,为减少不均匀沉降对垃圾防渗层的影响、准确确定垃圾储量和保证垃圾堆体的稳定,开展垃圾填埋场沉降研究具有重要意义。垃圾填埋场沉降变形包括地基沉降和垃圾堆体沉降,垃圾堆体沉降又分为主沉降和次沉降,主沉降完成时间短于次沉降。通过对陕西省宝鸡市垃圾填埋场地基土进行沉降计算,最大沉降差超过100 mm,对垃圾防渗层不利影响较大;而对垃圾堆体沉降计算,修正后的计算值与沉降观测值非常接近。考虑不同地区地层差异和垃圾成分差异,积累沉降观测资料具有重要意义。  相似文献   

A Method for Automatically Selecting Aids to Navigation Based on their Spatial Influence Domains     

Lihua Zhang  Sipeng Li  Shuaidong Jia 《Marine Geodesy》2016,39(3-4):256-270

To address the limitations of manually selecting aids to navigation (AtNs) on charts, a method for automatically selecting AtNs based on their spatial influence domains (SIDs) is proposed. First, the associations between the spatial attributes of an AtN are analyzed. Second, an SID of the AtN is defined, and a model of the SID is constructed based on the associations between the spatial attributes. Third, the importance of the location of the AtN is weighted based on the SID model. Fourth, an algorithm to automatically select AtNs based on the maximum coverage of the SIDS of preselected AtNs is developed. Finally, several AtNs are selected automatically using the algorithm. The experimental results demonstrate that (1) the proposed method can automatically select AtNs and the results comply with the requirements; (2) the automatic selection can eliminate the human-induced errors or the inconsistent results of manual selections from different operators; and (3) the efficiency of the proposed method is higher than that of current manual methods.  相似文献   

我国海岛管理信息化建设问题与对策研究   总被引：1，自引：0，他引：1       下载免费PDF全文

徐文斌  徐鹏杰  王娜  孙苗  王晶 《海洋开发与管理》2016,33(10):8-12

海岛管理信息化建设是《中华人民共和国海岛保护法》赋予海洋行政主管部门的主要职责之一。文章分析研究我国海岛管理信息化建设的背景和现状,指出面临的一系列问题,从总体规划、数据应用、完善机制、统筹管理、加强配套、保障安全等方面提出相应对策,为我国海岛管理信息化建设提供参考。  相似文献   

五硼酸铷溶液的物化性质及物种分布          下载免费PDF全文

苗军涛  房艳  房春晖  朱发岩  刘红艳  周永全  戈海文  孙鹏超  赵晓婵 《盐湖研究》2016,24(1)

碳酸铷、硼酸化学计量比混合,蒸发溶液,直至五硼酸铷RbB5O8·4H2O晶体析出。经粉末X射线衍射（XRD）、拉曼光谱（Raman spectroscopy）、热重/微商热重/差示扫描量热（TG/DTG/DSC）、原子吸收光谱等实验方法,确定其化学组成及结构。298.15、333.15K时测量溶液的物理化学性质（密度、电导、pH）,并与经验方程进行拟合,研究五硼酸铷溶液的物化性质随浓度、温度的变化规律。根据文献报道的平衡常数,实验测量的pH数据,采用牛顿迭代法进一步研究五硼酸铷溶液中主要存在的硼酸根离子对类型、含量以及物种的形成。  相似文献   

Effect of benzo[a]pyrene on detoxification and the activity of antioxidant enzymes of marine microalgae     

Chen Shen  Jingjing Miao  Yun Li  Luqing Pan 《中国海洋大学学报(英文版)》2016,15(2):303-310

The objective of this study was to examine the effect of benzo[a]pyrene(Ba P) on the detoxification and antioxidant systems of two microalgae,Isochrysis zhanjiangensis and Platymonas subcordiformis.In our study,these two algae were exposed to Ba P for 4 days at three different concentrations including 0.5 μg~(L-1)(low),3 μg~(L-1)(mid) and 18 μg~(L-1)(high).The activity of detoxification enzymes,ethoxyresorufin O-deethylase(EROD) and glutathione S-transferase(GST) increased in P.subcordiformis in all Ba P-treated groups.In I.zhanjiangensis,the activity of these two enzymes increased at the beginning of exposure,and then decreased in the groups treated with mid-and high Ba P.The activity of antioxidant enzyme superoxide dismutase(SOD) increased in I.zhanjiangensis in all Ba P-treated groups,and then decreased in high Ba P-treated group,while no significant change was observed in P.subcordiformis.The activity of antioxidant enzyme catalase(CAT) increased in I.zhanjiangensis and P.subcordiformis in all Ba Ptreated groups.The content of malondialdehyde(MDA) in Isochrysis zhanjiangensis increased first,and then decreased in high Ba P-treated group,while no change occurred in P.subcordiformis.These results demonstrated that Ba P significantly influenced the activity of detoxifying and antioxidant enzymes in microalgae.The metabolic related enzymes(EROD,GST and CAT) may serve as sensitive biomarkers of measuring the contamination level of Ba P in marine water.  相似文献   

Theoretical simulation of the evolution of methane hydrates in the case of Northern South China Sea since the last glacial maximum     

Lihua Liu  Haibing Shao  Shaoying Fu  Nengyou Wu 《Environmental Earth Sciences》2016,75(7):596

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Study on biological degradation and transform characteristics of different components in petroleum hydrocarbon used by bacterial consortium     

Lihua Chen  Chaohu Xiao  Xiaofang Luo  Wanhong Sun 《Environmental Earth Sciences》2016,75(9):816

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New Zircon U‐Pb Age of Granodiorite in Chifeng at the Northern Margin of North China Craton and Constraints on Plate Tectonic Evolution     

CHEN Jingsheng  LI Bin  YANG Hao  LIU Miao  YANG Fan  LI Wei  WANG Yan  CUI Tianri 《《地质学报》英文版》2018,92(1):410-413

正Objective The North China Craton(NCC)is one of the oldest cratons in the world.The accretionary belt at its northern margin has been the focus of scholars both at home and abroad(Zhu Junbing and Ren Jishun,2017).In recent years,a series of Late Paleozoic–Mesozoic intrusions trending E–W have been discovered within the northern margin of the NCC,forming a magmatic belt.The study  相似文献