自贸片区位于杨凌示范区南部,第四系松散层厚度较大,地下水资源丰富.为了查明杨凌示范区自贸片区地面沉降情况,分析地面沉降变形特征,为区域工程建设、城市地质灾害防治、国土空间规划等提供基础资料.采用SBAS-InSAR技术,在获取区内2017年～2022年Sentinel-1A 76景数据和数据预处理的基础上,分析了近5年平均沉降速率和累计形变量.结果表明,全区地面形变量为-84～40mm,形变速率为-18～7mm/a.大部分区域的形变速率为-5～5mm/a,地面沉降发育程度较弱,全区较为稳定.
根据泾阳县临空科创园的水文地质条件、地层热物性特征及其他条件,采用层次分析法(APH)确定各因子的权重,并最终利用综合指数法进行地埋管地源热泵适宜性的综合评价.结果显示,泾阳县临空科创园为地埋管地源热泵建设适宜区.
印尼北苏拉威西拉塔托托克金矿位于太平洋板块、欧亚板块、印度板块汇聚部位的北苏拉威西岛弧,主要包括林坡嘠和诺娜霍阿2个矿区,矿体赋存于北东向断裂构造的次级断裂构造带中,呈北东-南西向产出,含矿矿石主要为硅化断层角砾岩,该矿床类型为浅成低温热液型金矿,具不明显的卡林型金矿特征,对国内卡林型金矿外围找矿工作有一定指示意义.
文章简要介绍了运用EH4 大地电磁法对保山市昌宁县境内三家村隧道进行物探分析.在隧道上方地面沿隧道纵轴方向采用大地电磁法查明该地段的围岩完整性、围岩等级、岩溶发育及断层等构造的发育情况,为隧道工程地质条件评价提供必要的科学依据.此次工作完成了 1 条物探剖面,基本查清了该路段的地层结构、构造、岩溶发育分布情况.
利用InSAR、LiDAR、光学影像等多源遥感数据及技术手段在沅麻盆地"红层区"验证地质灾害新"三查"体系的适用性,探索建立基于综合遥感手段识别南方山地丘陵区地质灾害隐患的技术方法体系,为地质灾害隐患精准识别、精准防控提供基础数据和技术支撑.
铁矿石为大宗商品及战略物资,当前我国铁矿资源安全问题凸现.火山-沉积变质型铁矿是陕西省重要铁矿类型之一,涑水群为该类型铁矿的赋矿地层之一.渭北韩城-合阳-蒲城-富平航磁异常带幅值高、规模大,多个异常圈闭中心呈串珠状排列,地表主体为新生界地层.该磁异常带是否整体对应赋存磁铁矿的隐伏涑水群,如果存在,其展布形态如何,一直为陕西地质同行心中存疑.本文结合区域地质构造演化、航磁△T三维反演结果及 1∶5 万重、磁、电综合物探剖面反演解释结果,首次为该地区航磁异常带整体对应隐伏涑水群及其展布形态提出了推断依据,同时认为隐伏涑水群整体形似褶皱,NE-SW向展布,西北翼陡,东南翼缓.该认识推断有助于陕西省火山-沉积受变质型铁矿中阳山庄式铁矿的找矿预测,对陕西省铁矿找矿有着深远意义.
西安地区存在多处断裂带,由此产生很多次生地裂缝,对工程建设造成极大影响.本文通过调查、人工地震钻探、地质钻探等手段分析断裂的特征,确定了泾阳—渭南断裂(高陵区段)断层走向N57°W、倾向NE33°、倾角 70°、60m以浅垂直断距 3～10m.该断裂为全新世活动断裂,断裂上下错动速率 0.18mm/a.
柴北缘布赫特山一带滩间山群的火山岩以钙碱性为主,少量具有拉斑玄武岩趋势,岩性以安山岩为主;主量元素具有低Ti的特点(TiO2 平均值＜1％);稀土元素以轻稀土富集,具有明显的Eu负异常为特征;在微量元素蛛网图上,样品显示大离子亲石元素富集,亏损高场强元素,Nb、Ta呈现明显的"槽".显示其形成于岛弧环境.
渭河盆地地热资源丰富,开发利用历史悠久,以洗浴、供热为主,但原有开发模式属掠夺式开发利用,对资源损害较大,近年来中深层地埋管供热技术的研究使用,开创了一种新型利用模式,也激发了渭河盆地地热资源开发利用的新高潮.本文通过分析渭河盆地地热资源特征及中深层地热资源开发利用现状,结合高校、科研、企事业单位在中深层地埋管供热技术的研究,结合工作实际,对中深层地埋管供热技术进行了初步探析,大致了解了中深层地埋管供热技术的研究现状,分析出其中存在的地埋管传热机理复杂、持续换热稳定性低、换热效率较低等问题,提出下一步的研究方向.
在渭河盆地西部扶风地区开展的面积性土壤地球化学测量的基础上,本文通过对该区氦气地球化学特征以及地质、物探资料对比,和氦气的生储盖组合及圈闭条件研究分析,结合前人资料共圈出 3 处氦气成藏异常区.初步认为:瓶装土采样法能够有效提供氦气资源的地球化学信息,可快速圈定有利异常区,本次圈定的 3 处异常具有良好的氦气成藏条件,可作为氦气资源进一步勘查的有利靶区.
陕西岚皋沙沟钒矿位于北大巴山早古生代裂谷带内,赋存于下寒武统鲁家坪组第二岩性段第一岩性层.通过野外勘查、测试分析和综合研究,在矿区内共圈定5条主要钒矿体,矿石类型主要为碳硅质岩型钒矿石.矿石矿物主要为石英,其次为绢云母及少量黄铁矿、绿泥石等,绢云母为矿石中主要有用矿物,也是钒的主要载体矿物.该钒矿床受层位控制明显且规模较大,将为该区同类矿床暨新一轮找矿战略行动的项目部署及找矿突破提供借鉴意义.
统筹山水林田湖草沙一体化保护和系统治理的关键在于"统筹".结合陕西省推进统筹山水林田湖草沙系统治理实践,从三方面总结了陕西省统筹山水林田湖草沙系统治理取得的成效,并指出了目前统筹中存在的三个问题,从四个方面提出了进一步做好统筹山水林田湖草沙系统治理的措施建议.
秦岭北坡所处位置构造复杂,各类地质灾害时有发生.本文以西安市鄠邑区邬桑峪危岩崩塌地质灾害为例,调查其地形地貌、岩石岩性、构造等特征,详细分析该崩塌灾害的形成机制和危害范围.通过公式计算和赤平极射投影分析崩塌灾害的稳定性,采用Rocfall崩塌落石模拟分析危岩体的运动特征.根据分析结果提出治理方案,可为秦岭北坡同类危岩崩塌提供借鉴.
Xianghe vanadium deposit belongs to metamorphic sedimentary vanadium deposit occurring in black rock series of the Lower Cambrian Shuigou Formation, in which the host lithology is tectonically fractured-barite silicifiedargillaceous siliceous slate and carbonaceous siliceous slate. Through SEM SEM/EDXS X diffraction surface scanning,electron probe energy spectroscopy analysis and phase analysis, it is believed that vanadium is mainly closely related to omite, followed by kaolinite, gelatate limonite, rutile, and not closely related to quartz, barite, potassium feldspar, dolite and pyrite. Vanadium has no independent minerals, V2O5 in mica is 64.68%, V2O5 in iron oxide and clay minerals 32.34%,and V2O5 in refractory minerals 2.98%. The study on the occurrence state of vanadium elements in this deposit provides a support for studying the origin of similar vanadium deposits and improving the beneficiation process.
The Ningshan-Zhen’an tungsten molybdenum gold polymetalli concentrated zone is located at a structural junction between the Indosinian fold belt in the South Qinling Mountains and the Yanshanian northeast trending tectonic magmatic rock belt in Laoniushan-Yanzhiba area, where the unique tectonic location and frequent magmatic activities produced a rich and wide variety of mineral resources. The Dongyang tungsten deposit is located near the contact zone between the north-east trend Lanbandeng rock mass and carbonate rocks occurring in the Shiwengzi Formation and the Liangchakou Formation. Based on age determination of 215.7 ± 4.1ma for zircon U-Pb in the NE trending pegmatite type（feldspar quartz vein type） tungsten ore body, the metallogenic age of the Dongyang tungsten deposit should be at the Late Triassic, which indicates that a very important tungsten mineralization event might occur in the Ningshan-Zhen’an area at the late Indosinian period and the formation of tungsten deposits should be closely related to the late Indosinian magmatic activity-mineralization in the area.
Carbonaceous slate of the Lower Cambrian Niutitang Formation occurs in the area of Zhongbao town in southern Zhenping County, Shaanxi Province. It is indicated that the carbonaceous slate is rich in organic matter and has a certain potential of shale gas resources according to preliminary analysis and study on its Organic geochemistry characteristics,mineral composition, physical properties and pore types.
The Jiekou rock mass lies in the Mianxian-Lueyang area of the Mian-Lue suture zone with patchy and spherical structure, suffering from strong serpentinization and different degrees of carbonation, in which the content of trace elements basically falls into the range of trace elements of kimberlite occurring in China（Shandong, Liaoning） and other countries,including relatively rich in LREE and large ion lithophilic elements（Cs, Ba, U, Th）, loss（K, Sr） and strong loss of K elements. Kimberlite may result from low partial melting of enriched mantle magma, with less separation and crystallization of olivine and spinel minerals and weaker assimilation mixes during magma evolution. The emental geochemistry suggests that Kimberlite in this area should be poor.
Satellite image data resources are abundant, data coverage is wide, frequency is high in data collection, and the collection is not affected by local changes or policy changes. Using satellite remote sensing technology, centering on the supervision and law enforcement of land resources in the northern part of Qinling Mountains, comprehensively carry out dynamic monitoring of land resources, development and supervision of mineral resources, to continuously improve the ability of land and resources investigation, supervision and governance.
Through geological survey, UAV aerial survey, sampling analysis and other technical methods and means,the limestone mine occurring in the Wufeng Mountain area of Qianxian County was investigated, including stromatolite limestone horizon, spatial forms, sizes of ore bodies, material composition, texture and chemical composition. Based on topographic mapping by means of UAV and other ore exploration projects, the deposit reserves are estimated and mining technical conditions in this area are also discussed in this paper.
