基于局部频率和多网格技术的InSAR相位解缠算法

提出一种基于自适应局部频率估计和多网格加权迭代的相位解缠算法。采用高精度的局部频率估计代替滤波相位差分,先用最小二乘FFT法进行初始相位解缠,再以局部频率估计置信度做为依据判断不可解缠区域进而设置加权参量,应用多网格法完成精细相位解缠。局部频率估计的应用使得解缠前无需进行单独的相位滤波,简化了InSAR处理模块,提高了数据处理效率。经实验验证,InSAR数据处理精度明显提高。     

Pan-African Alkali Granitoids from the Sør Rondane Mountains, East Antarctica

Alkali granitoids (500-550 Ma) representing a prominent Pan-African magmatic event are widely distributed in the Sør Rondane Mountains, Dronning Maud Land, East Antarctica. Geochemically, they are granitic to syenitic in composition and show an alkaline affinity of A-type granites. They are characterized by high K₂O+Na₂O (7-13 wt%) and K₂O/Na₂O (1-2), low to intermediate Mg#, wide ranges of SiO₂ (45-78 wt%), Sr (20-6500 ppm) and Ba (40-13000 ppm) and have Nb and Ti depletion in the primitive mantle normalized diagram. The granitoids are subdivided into Group I granites, Group II granites, Lunckeryggen Syenitic Complex and Mefjell Plutonic Complex. The Group I granites have higher Mg#, Sr/Ba, Sr/Y, (La/Yb)_N and LREE/HREE, lower A/CNK, SREE and initial ⁸⁷Sr/⁸⁷Sr ratios and lack Eu anomalies compared to those with negative Eu anomalies in the Group II granites. The syenitic rocks from the Mefjell Plutonic Complex are higher in alkali, Ga, Zr, Ba, and have lower Mg#, Rb, Sr, Nb, Y, F and LREE/HREE with positive Eu anomaly, whereas the granites from the Mefjell Plutonic Complex have high LREE/HREE ratios with negative Eu anomaly. The Lunckeryggen syenitic rocks have intermediate Mg#, higher K₂O, P₂O₅, TiO₂, Fe₂O₃/FeO, Ba, Sr/Y and LREE/HREE ratios with lack of Eu anomalies and are lower in Al₂O₃, Ga, Y, Nb and Rb/Sr ratios. Based on chemical characteristics combined with isotopic data, we suggest that the Lunckeryggen syenitic body and Group I granitic bodies may be derived from the mantle-derived hot basic magma by fractional crystallization with minor assimilation. We also suggest that the Group II granites may be derived from assimilation with crustal rocks to varing degrees and then fractional crystallization in higher crustal levels (ACF model). The Mefjell Plutonic Complex seems to be derived from a heterogenetic magma source compared with other granitoids from the Sør Rondane Mountains. The syenitic rocks in the Mefjell Plutonic complex have a unique source (iron-enriched) and have a chemical affinity with the charnockites in Gjelsvikjella and western Mühlig-Hofmannfjella, but not like the Yamato syenites in adjacent areas.     

Precise Dating and Geological Significance of the Caledonian Shangyou Pluton in South Jiangxi Province

The zircon SHRIMP dating age for the Shangyou granites is 464±11 Ma. The geological feature of the pluton is consistent with the isotopic age, which shows that it is a product of Caledonian orogenesis. The Shangyou granites are regarded as peraluminous crust-derived granites to possess the typical geochemical characteristics of calc-alkaline rocks on the active continental margin with enriched Si, K, Al （A/CNK -- 1.11 on average）, HREE, Rb, U, Th and heavily depleted V, Cr, Co, Ni, as well as Ti-Y, Nb-Ta, Zr, Sr, P and Ba, to be commonly corundum normative （av C -- 1.44）. The Shangyou granites with higher 87Sr/86Sr ratios （0.707126-0.712186）, ENd（t） values （-7.29 to -10.22） and （tDM） values （1.52-1.63 Ga）, which are considered to result from partial melting of continental crust metamorphic sedimentary rocks with relatively low of crust maturation degree corresponding to the Middle Proterozoic, to have some possible contributions of mantle-derived components. The Shangyou granites are regarded as post-collision granites, which were formed in a transitional tectonic setting from compression to extension in the Middle Ordovician period after the Yangtze plate was subducted beneath the Cathaysian plate. The Ar-Ar total ages of K-feldspar and biotite are 292.1 Ma and 295.5 Ma respectively, which have recorded information of a late-stage thermal alteration event.     

县域经济发展时空差异和影响因素的地理探测——以甘肃省为例

县域作为中国经济发展的基本空间单元和产业承接载体,对其经济发展的空间差异及其影响因素的研究对理解区域经济格局及其演变具有重要意义。运用ArcGIS空间分析功能,以NICH指数和人均实际GDP为县域经济发展测度指标,以甘肃省为研究对象,对县域经济发展的空间集聚状态和时空演变进行动态分析,并对经济发展的影响因素进行地理探测。结果表明：2001—2015年,甘肃省县域经济发展活力与发展水平空间格局基本吻合;就经济发展活力而言,其县域与城区发展不平衡,且经济发展活力整体上呈现下降态势,县域经济逆势提升具有很大挑战;经济发展活力冷热点区保持相对稳定,重心向西北倾斜的“哑铃状”空间格局不断强化,热点区呈现明显的“点-轴”发展格局;甘肃省县域经济空间差异主导因子包括工业化水平、经济基础、市场规模,各影响因素之间具有明显的交互作用,增强了单一因子的贡献量;县域经济发展的主导影响因素存在明显的地域差异性,对不同分区主导因子驱动机制的分析,可以为科学制定四大分区县域经济发展定位及地区协调统筹发展提供参考。     

侵蚀浪条件下沉水植被对沙坝-潟湖海岸的冲淤影响研究

全球海岸生态系统正遭受气候变化及人类活动带来的威胁, 本文基于沙坝-潟湖系统海岸典型剖面形态, 通过设计实施动床波浪水槽试验, 定量研究了侵蚀浪条件下沉水植被对该系统海岸冲淤的影响。结果表明: 沉水植被明显削弱了沙坝前坡波浪破碎区前缘的波高增大幅度, 并使坝后波高衰减; 植被作用使波浪反射和透射系数减小、耗散系数增大; 侵蚀浪作用下, 沙坝坝顶冲刷较明显, 潟湖内呈淤积趋势, 海岸前丘受波浪冲刷呈陡坎形态。植被影响下沙坝和前丘区域最大侵蚀厚度均减小; 植被可减少沙坝净侵蚀量、潟湖内淤积量及离岸输沙量, 对海岸前丘有较好的保护作用。     

Geology and fluid inclusion characteristics of Qilishan gold deposit in Zhaoyuan of Shandong,China

The Qilishan gold deposit is located in the southern Zhaolai gold ore belt in the northwestern Jiaodong region.A total of seven gold ore bodies have been found in the mining area.Linglong gneissic biotite granite and the NE trending Lingbei fracture control the output and distribution of the gold deposit.The ore bodies with veined or irregular shape occur in the structural alteration zone.The ore bodies of different sizes are NE trending and SE dipping.The constituent minerals of the ores mainly include pyrite,chalcopyrite,native gold,electrum,argentite,matildite,hematite,quartz and calcite.The ores are characterized by metasomatic dissolution structure,as well as veined and brecciated structures.The ore-forming process is divided into four stages,namely quartz-,pyrite-,polymetallic-and carbonate stages.Study on fluid inclusion shows that the deposit is composed of gas-liquid two-phase inclusions （Ⅰ） and three-phase inclusions containing CO2 （Ⅱ）,and that the former dominates.The homogenization temperature is 259.6℃-373.7℃ ; the salinity of three-phase inclusions containing CO2is 5.77%-9.84% （NaCl） ; the salinity of gas-liquid two-phase inclusions is 6.58%-8.54% （NaCl） ; and the estimated ore-forming pressure is 55.2-82.2 MPa.According to the nonlinear relationship between the depth and pressure of the fluid in the fracture zone,the ore-forming depth of the Qilishan gold deposit is calculated as 5.95-7.14 km.It is preliminarily determined that the deposit is a mesophilic and hypothermal gold deposit.     

阿尔泰晚古生代早期长英质火山岩的地球化学特征及构造背景

新疆北部哈巴河一带出露的一套晚古生代早期长英质火山岩主要由英安质—流纹质火山岩组成。其Rb-Sr等时线年龄为405±57Ma,为早泥盆世。地球化学特征显示它们具有Ti含量低,Mg#含量中等—富集(42.2~88.7),Th/Ta为8.6~16.4,低—中等Ti/Zr值(介于4.9~53.46);稀土配分型式为LREE富集,无Eu或中等的负Eu异常;且在蜘蛛网图上显示LILE富集,Nb和Ta亏损的特征。Y-Nb和Rb-(Y+Nb)构造判别图解显示这些长英质火山岩形成于岛弧环境。结合前人的研究成果,认为新疆北部哈巴河晚古生代早期长英质火山岩是在古亚洲洋北侧岛弧构造环境下形成的,是作为古亚洲洋从SW至NE方向朝西伯利亚古板块俯冲的产物。     

鄂尔多斯盆地东北部中侏罗统直罗组下段沉积相及其对铀成矿的控制作用

综合前人的研究成果,结合野外地质考察,并通过1048个煤田和核工业部钻孔岩心的编录统计, 将鄂尔多斯盆地东北部中侏罗统直罗组划分为上中下3段。作者将直罗组下段作为研究目标层,分析了其砂体 特征、含砂率、地层厚度和底板埋深等分布情况,结合野外地质露头和测井解释资料的综合研究,将研究区直 罗组下段划分出3种沉积相,分别为河流相、三角洲相和滨浅湖相。最后,通过东胜矿床沉积相与砂岩型铀矿 的成矿关系研究,表明辫状河-辫状河三角洲相是鄂尔多斯盆地东北部最有利的沉积相,其次是曲流河-曲流 河三角洲相,并简要阐述了东胜矿床外围今后找矿的重点区域为东胜地区西北部、榆林地区西部、横山地区西 北部的辫状河道和三角洲平原分流河道发育的区域。