海岸带、海岛(礁)数字航空摄影方案优化策略

针对数字航空摄影作业技术流程中的作业标准、精度要求以及各关键指标的控制等问题,从数字航空摄影的技术计划制定、航线规划和各项技术指标的确定等方面入手,对基于海岸带、海岛(礁)特征的航摄分区、航线敷设、地面分辨率的确定、航摄季节与时间选择以及POS辅助航空摄影方案选择等内容进行了研究,为获取满足海洋测绘指标要求的航空摄影数据源提供支持。     

Phase Equilibria Constraints on Relations of Ore-bearing Intrusionswith Flood Basalts in the Panxi Region, Southwestern China

There are two types of temporally and spatially associated intrusions within the Emeishan large igneous province (LIP); namely, small uitramafic subvolcanic sills that host magmatic Cu-Ni-Platinum Group Element (PGE)-bearing sulfide deposits and large mafic layered intrusions that host giant Ti-V magnetite deposits in the Panxi region. However, except for their coeval ages, the genetic relations between the ore-bearing intrusions and extrusive rocks are poorly understood. Phase equilibria analysis (Q-PI-OI-Opx-Cpx system) has been carried out to elucidate whether ore-bearing Panzhihua, Xinjie and Limahe intrusions are co-magmatic with the picrites and flood basalts (including high-Ti, low-Ti and alkali basalts), respectively. In this system, the parental magma can be classified as silica-undersaturated olivine basalt and silica-saturated tholeiite. The equivalents of the parental magma of the Xinjie and Limahe peridotites and picrites and iow-Ti basalts are silica-undersaturated, whereas the Limahe gabbro-diorites and high-Ti basalts are silica-saturated. In contrast, the Panzhihua intrusion appears to be alkali character. Phase equilibria relations clearly show that the magmas that formed the Panzhihua intrusion and high-Ti basalts cannot be co-magmatic as there is no way to derive one liquid from another by fractional crystallization. On the other hand, the Panzhihua intrusion appears to be related to Permian alkali intrusions in the region, but does not appear to be related to the alkali basalts recognized in the Longzhoushan lava stratigraphy. Comparably, the Limabe intrusion appears to be a genetic relation to the picrites, whereas the Xinjie intrusion may be genetically related to be low-Ti basaits. Additionally, the gabbro-diorites and peridotites of the Limahe intrusion are not co-magmatic, and the former appears to be derived liquid from high-Ti basalts.     

四氢呋喃水合物沉积物静动力学性质试验研究

利用研制的天然气水合物沉积物合成与力学性质测试一体化试验设备,以粉细砂土和蒙古砂土作为沉积物骨架,对四氢呋喃(THF)水合物沉积物进行了静动三轴试验,获得了水合物分解前后沉积物样品的应力-应变关系、强度和液化特性,对两种骨架的水合物沉积物的性质进行了对比,同时将水合物分解后的沉积物与对应的饱和土的动三轴试验结果进行了对比。结果表明：水合物沉积物均表现为塑性破坏;围压越大,水合物沉积物强度越高;水合物分解导致沉积物的强度大幅降低;水合物分解后沉积物液化所需的时间较饱和水沉积物缩短     

中天山巴仑台地区变形花岗岩类LA-ICP-MS-U-Pb年代学及其构造意义

本文对巴仑台地区中天山南北边缘的变形花岗岩体进行了详细的锆石LA-ICP-MS-U-Pb年代学研究。中天山北缘花岗质片麻岩中岩浆锆石结晶年龄为630.0±5.0 Ma,代表了中天山微陆基底的新元古代岩浆事件年龄;其变质增生锆石边的年龄为440.9±3.3 Ma,精确限定了中天山北缘洋盆闭合与碰撞造山作用的时代为早志留世。中天山南缘糜棱岩化花岗闪长岩中岩浆锆石结晶年龄为389.5±3.2 Ma,指示出中天山南缘洋壳在中泥盆世向北俯冲形成陆缘岩浆弧;其变质增生锆石边的年龄为362.1±4.3 Ma,精确限定了中天山南缘洋盆闭合与碰撞造山作用的时代为晚泥盆世末期。研究结果还表明中天山微陆块具有年龄为2.5Ga和1.8Ga的古老结晶基底。     

重力勘探中近区地形改正数据测量方法的试验

针对重力勘探中近区地形改正的重要性以及至今没有效果较好的地形改正方法,笔者采用四种方法(目估、激光测距仪、森林罗盘仪、RTK)分别从人工、使用仪器、用时、精度及综合的台效方面进行了详细分析,总结了各种方法的优缺点,为近区地改提供了较好的应用和示范效果.     

hairy和hedgehog在单环刺蜢幼虫体节形成过程中的表达特征分析

hairy作为成对控制基因参与果蝇等体节动物的体节形成;体节极性基因hedgehog是节肢动物和环节动物体节边界维持的关键基因。本研究分析了单环刺螠hairy的序列特征以及hairy和hedgehog在其幼虫体节发生过程中的时空表达特征,结果显示:单环刺螠Hairy序列中含有保守的HLH结构域、Hairy_orange结构域和四肽WRPW;其mRNA在早期体节幼虫中的表达量显著高于晚期担轮幼虫,并且定位于每个体节的边界处。单环刺螠hedgehog mRNA在体节幼虫中的表达水平显著高于早期体节幼虫,并且呈现保守的体节边界表达特征。研究结果表明,hairy和hedgehog在单环刺螠幼虫体节中的表达图式与小头虫等典型体节动物中的表达图式基本一致。     

滇西北地区富碱岩体(脉)地质学及岩石化学特征

喜山期富碱岩体广布于滇西北地区 ,通过对其地质学和岩石化学特征的研究 ,认为富碱岩体 (脉 )由正长 (斑 )岩、二长斑岩、花岗斑岩及相关的火山岩组成 ,具有多次活动的特征 ,并形成区内富有特色的岩浆岩系列 ;该系列岩浆岩以富碱高钾为突出特点 ,具有正常的岩浆演化趋势 ,不同岩带岩石地质学和岩石化学方面有区域性变化规律。     

Granule ripples in the Kumtagh Desert,China: Morphology,grain size and influencing factors

Granule ripples are found mainly in four regions of the Kumtagh Desert in China; they are characterized by an asymmetrical shape, with gentle lower slopes on both sides and abrupt crests. The ripples tend to be oriented perpendicular to the prevailing winds, except when they form near obstacles such as yardangs. The wavelengths (λ) range between 0·31 m and 26 m and heights (h) range from 0·015 m to 1 m. The relationship between wavelength and height can be described by a simple linear function, and the mean ripple index (λ/h) is about 20·4 for the study sites. The sediments are poorly sorted, with negative to very negative skewness at lee and stoss slopes and between‐ripple troughs, which confirms the ‘poured in’ and ‘shadow’ appearance described by previous researchers. The bimodal or trimodal distributions of grains (with modes of ?1·16φ, ?0·5φ and 3·16φ) and the enrichment of coarse particles at the ripple surface (with coarse granule contents ranging between 5·2% and 62·1%) indicate that the underlying layer is the original sediment source and that the granule ripples resist erosional processes. Although the impact of saltating particles and, consequently, the creep and reptation of coarse grains are responsible for granule ripple initiation at a micro‐scale, however, the characteristics of local sediments, wind regimes and topographical obstacles, as well as the feedbacks among bedform and airflow, more strongly affect the development and alignment of granule ripples at a macro‐scale.     

赣南银坑山铀矿点地球化学特征及其找矿意义

银坑山铀矿点位于赣南九龙嶂火山盆地南东边缘,矿体呈脉状,水云母化、赤铁矿化明显.与围岩相比,矿石的Al2O3、SiO2含量降低,Fe2O3(FeO)、MnO、CaO、S、Cl呈富集趋势,Mo、Ag、Th为主要伴生组分.从矿化蚀变组合特征看,银坑山矿点属岩浆热液型,且位于岩浆热液成矿系统的上部,深部具成矿前景.     

南岭东段龙源坝复式岩体La-ICP-MS锆石U-Pb年龄及其地质意义

龙源坝岩体是南岭花岗岩体群的一个重要组成部分,位于南岭东段,研究程度十分薄弱,至今未见可靠的同位素年龄报道。本文在运用阴极发光技术对岩体中的锆石进行细致的内部结构分析的基础上,利用La-ICP-MS锆石U-Pb原位定年方法进行了同位素年龄测定。结果表明,龙源坝岩体是一个印支期—燕山期多期次岩浆侵入形成的复式岩体,其中主体形成于印支期,尤其是印支早期。印支早期花岗岩的单颗粒锆石U-Pb年龄为241.0±5.9Ma和241.0±1.3Ma(两个样品),印支晚期花岗岩为210.9±3.8Ma,燕山期正长岩为149.4±1.2Ma。龙源坝岩体在时代和成因上不同于其东侧的陂头岩体,但相同于北侧的诸广山岩体有亲缘关系,因此在探讨该区的铀成矿前景时,应把诸广山与龙源坝两岩体整合起来考虑,并加强对龙源坝岩体的铀矿找矿工作。