西安河金矿床特征及找矿前景分析

西安河构造 (热液 )蚀变岩型金矿床 ,产于丹凤群及大草滩组发育的近EW向断裂破碎带内。矿床规模已达中型。矿石以低品位构造蚀变岩型为主 ,褐铁矿、黄铁矿是主要的载金矿物。围岩蚀变以硅化、褐铁矿化、黄铁矿化、绢云母化为特征。中基性火山岩、韧脆性断裂构造、中酸性岩浆侵入“三位一体”是控制矿床形成的基本条件。区内成矿条件优越 ,具有形成大型金矿的可能性 ,近EW向断裂蚀变延伸带是寻找金矿的有利地段。     

三峡坝区非对称共轭低缓角度剪破裂系

在岩石摩擦流变学理论指导下, 运用构造解析方法, 在三峡坝区岩体内多期的、复杂的破裂系统中, 识别出一个不对称的共轭低缓角度剪破裂系统.几何学和运动学标志证明, 这个影响大坝深层和浅层抗滑稳定性的共轭剪切破裂系统形成较早, 受岩体非均一性制约, 被后期破裂系统切错和改造, 是高流体压力控制下非对称共轴变形的结果.      

豫西秦岭群变质岩岩相学特征及早期地壳演化

豫西秦岭群是东秦岭褶皱带的核心岩系,具角闪岩相变质并有不同程度的混合岩化.空间上呈透镜状构造域,其内部可识别三期变形,韧性强应变带十分发育。变质岩系内主体岩石显示为成熟度不高的陆源碎屑沉积,是活动带沉积的特点,变质泥砂岩沉积的稀土组成及微量元素显示为后太古沉积的特征,而区内广泛分布的变质基性岩墙群,可代表早期的地壳拉张环境。     

Studying surface structure in desert areas using multiple kinds of surface wave data

Shallow surface wave methods are mostly used for investigation of the surface velocity structure in environmental and engineering geophysics in non-desert areas. For the special geological features of the Takelamagan Desert area, we use the multi-channel analysis of surface wave （MASW） method to process multi-channel shallow surface wave records to determine the near surface velocity structure in the desert area. We also process, analyze, and compare the surface waves in many-trace records extracted from the oil exploration shot gathers in the area. We show that the MASW method can determine detailed shallow velocity structure in desert areas and the many-trace records can be used to get detailed deep geological structure. The combination of the two different datasets can obtain the exact velocity structure upper 60 m depth in the survey area.     

The influence of agriculture in the process of population integration and cultural interaction during the Eastern Zhou Period in central-south,Inner Mongolia: Carbon and nitrogen stable isotope analysis of human bones from the Dabaoshan cemetery,Helingeer County

Central-south Inner Mongolia, China, is highly sensitive to the cultural interactions between sedentary agriculturalists and nomadic pastoralists during the Eastern Zhou Period (770–256 BC). The previous pattern of multiple cultures and diverse ethnic groups has been transformed to the increasingly dominated cultural system of Central Plain since the middle and late Warring States Period, when the states of Zhao and Qin have conquered the most parts of central-south Inner Mongolia. However, the variation of subsistence strategies during this historical process has never been evaluated. Particularly, as the typical representative of Central Plain cultures, the effect of intensive millet agriculture is still unknown in the process of population integration and culture interaction. Thus, to explore the shift of subsistence pattern, carbon and nitrogen stable isotope analysis of bone collagen from Dabaoshan site (410–180 BC) have been performed. The isotopic result indicates a large amount of C4-based animal protein consumed by Dabaoshan humans. According to the archaeological backgrounds, we propose the Dabaoshan persons intensively relied on the millet agriculture and developed the agro-pastoral economy, which hinted the comprehensive influences from Central plain civilizations in late Warring States Period. Further compared with other published isotopic data in the same region during different periods, we suggest the millet agriculture has played the positive role in the process of population integration and culture fusion in central-south Inner Mongolia during the Eastern Zhou Period.     

Changes in Shale Rock Properties and Wave Velocity Anisotropy Induced by Increasing Temperature

Natural Resources Research - Water saturation, organic matter content, and fractures are important factors influencing the physical properties of shale. In this study, shale samples were subjected...     

厚层风积黄土覆盖区金矿脉的壤中气汞异常特征及评价

赤峰市莲花山金矿区南部为大片风积黄土覆盖区，壤中气汞测量圈出了许多气汞异常，其中在已开采的４号、５号金矿脉上，气汞异常的形态、规模和强度都较好地反映了矿体的产状和规模。新的工业金矿体的发现，更加证实了壤中气汞测量找金矿脉的有效性。通过壤中气汞异常的评价，认为４号矿脉的北部，５号矿脉的南部，Ｈｇ２号异常的南部及Ｈｇ３号异常的深部有较好的开采远景，而４１号、１５号、２０号石英脉则无工业价值。     

基于GIS对岩溶塌陷预测及评价的方法

根据GIS强大的数据综合处理功能及其在地质灾害预测与评价方面的应用,通过对岩溶塌陷的区域条件、影响因子、预测及评价过程的研究,建立了以GIS、RS、GPS组成的空间信息技术体系应用于对象的技术手段确定评价指标和体系,收集评价数据,结合评价信息的处理和提取,实施评价模型,划分岩溶塌陷度综合等级。此方法的思路与方法似值得借鉴。     

天津蓟州五名山滑坡隐患早期识别监测

为精确识别五名山滑坡隐患,利用Sentinel-1A/B升降轨数据,基于SBAS-InSAR技术反演2017-03~2021-04该地区垂向和坡向形变,识别滑坡灾害以及隐患点,对形变时间序列及滑坡原因进行分析。结果表明,五名山潜在地质灾害隐患可分为3个区域,其中最大垂向累积形变达-38.28 mm,临空面坡体最大坡向累积形变为22.10 mm;降水量对坡体稳定性具有不同程度的影响,坡体累积形变峰值滞后于降水峰值。研究成果可回溯蓟州五名山滑坡灾害形变特征,为天津北部山区地质灾害监测识别提供新思路,为防灾减灾提供保障和技术支持。     

An optimal design of the broadcast ephemeris for LEO navigation augmentation systems

As the deployment of large Low Earth Orbiters (LEO) communication constellations, navigation from the LEO satellites becomes an emerging opportunity to enhance ...