Petrogenesis of the Late Cenozoic collision volcanism in the central part of the Lesser Caucasus (Azerbaijan)     

N.A. Imamverdiyev  M.Ya. Gasangulieva  G.J. Babaeva  Sh.F. Abdullaeva  A.A. Veliev 《Russian Geology and Geophysics》2018,59(1):41-54

The Late Cenozoic volcanics of the Lesser Caucasus have similar trace-element and REE patterns with negative anomalies of Nb, Ta, Hf, and Zr. They are highly enriched in Rb, Ba, Th, and La and depleted in Ti, Yb, and Y with respect to N-MORB, which indicates their formation from the subduction-metasomatized lithospheric mantle. Partial melting of the subcontinental mantle lithosphere and crustal assimilation and fractional crystallization controlled the magma evolution in the collisional magmatic belts.  相似文献   

Epifanovite,NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O: a New Mineral from the Kester Deposit,Sakha (Yakutia) Republic,Russia     

Yakovenchuk  V. N.  Pakhomovsky  Ya. A.  Konoplyova  N. G.  Panikorovskii  T. L.  Mikhailova  Yu. A.  Bocharov  V. N.  Krivovichev  S. V.  Ivanyuk  G. Yu. 《Geology of Ore Deposits》2018,60(7):587-593

Geology of Ore Deposits - Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O, a new natural copper, sodium and calcium arsenate–phosphate, has been found in a quartz–phosphate pocket...  相似文献   

西秦岭温泉—中川一带金属矿床的成矿规律及找矿预测   总被引：1，自引：1，他引：0       下载免费PDF全文

刘彦良  高雅  罗维斌  季文中 《中国地质调查》2018,5(4):40-49

西秦岭温泉—中川一带实施的1:5万矿产地质调查项目,共圈定1:5万局部高磁异常33处,1:5万地球化学综合异常11处,发现矿点2处,矿化点5处,矿种有金、钼、铁、铜、铷等。通过分析研究区成矿地质条件、1:5万地球物理和地球化学综合异常特征、矿(化)点特征及分布规律等,阐明了该区成矿时空分布规律和矿产共生组合规律,划分成矿远景区9处,提交找矿靶区6处。对其中2处找矿靶区进行槽探验证的结果为: 关子镇幅玉杨观找矿靶区圈定了4条含铷矿化伟晶岩脉和多处铁矿化破碎蚀变带,具有形成伟晶岩型铷矿的潜力; 礼县幅李坝金矿床南侧百叶沟—河西沟找矿靶区圈定了14条蚀变破碎带,在矿化蚀变带内圈定了11条金矿(化)体,具有形成构造蚀变岩(微细粒浸染状)型金矿床的潜力。  相似文献   

The Structure of the Sedimentary Cover of the Kandalaksha Gulf,White Sea,from Seismoacoustic Data     

A.?V.?StarovoitovEmail author  M.?Yu.?Tokarev  Ya.?E.?Terekhina  N.?A.?Kozupitsa 《Moscow University Geology Bulletin》2018,73(3):295-305

The geological structure of water areas adjacent to the White Sea biological research station of Moscow State University (Rugozero Bay and Great Salma Strait; both are parts of the Kandalaksha Gulf, White Sea) was studied for the first time based on the seismoacoustic data. The morphology of the top of the Achaean basement, the structure of the Quaternary sedimentary cover, and the bottom topography were investigated. The sequence of glacial deposits dated back to the last glaciation and the compound sequence consisting of glaciolacustrine, glacial-marine, and marine sediments are distinguished. The spatial locations and changes of their thicknesses are considered. It is shown that the recent bottom topography is controlled by predominantly NW- and NE-striking faults that run through the entire sedimentary sequence, including the Holocene sediments.  相似文献   

山东省优质地下水资源评价研究     

贾德旺  冯亚伟  卜华 《地下水》2018,(6):12-16,185

地下水是水资源的重要组成部分,山东省作为我国的北方大省,近年来随着人口的增长和经济发展,地下水环境问题日渐突出,表现为水质型缺水和水源型缺水两方面。本文以山东省地下水为研究对象,对全省富水地段及已建水源地逐一进行水质评价及开采潜力评价研究,结果显示:山东省优质水占49.53%,主要分布在鲁中南山区和鲁东低山丘陵区,新圈定的优质地下水富水地段及有开采潜力水源地共计88处,优质地下水允许开采量184.095×10~4m^3/d,可满足一千余万居民生活用水需求。应急情况下富水地段(水源地)允许开采量为434.299×10~4m^3/d,应急开采潜力为279.295×10~4m^3/d,可解决两千余万人生活用水困难。  相似文献   

Neotectonics and the Upper Mantle Structure of Central Asia     

Trifonov  V. G.  Sokolov  S. Yu.  Bachmanov  D. M.  Sokolov  S. A.  Trikhunkov  Ya. I. 《Geotectonics》2021,55(3):334-360

Geotectonics - Studies carried out by the authors show that the uplift of Central Asia situated between the eastern Alpine–Himalayan and western Altai–Stanovoy orogenic belts formed in...  相似文献   

祁连山北麓牧区社会-生态系统脆弱性诊断 ——以甘肃肃南裕固族自治县为例   总被引：3，自引：1，他引：2  

王娅  杨国靖  周立华 《冰川冻土》2021,43(2):370-380

基于人与自然耦合视角,辨识社会-生态系统脆弱性是区域可持续发展研究的核心议题和前沿领域。依据社会-生态系统和脆弱性经典范式VSD模型（Vulnerability Scoping Diagram）,利用显式空间脆弱性指数和致脆因子诊断模型分析了2004—2016年肃南县社会-生态系统脆弱性的变化趋势及其致脆因子。结果表明：该县社会-生态系统的暴露度指数介于0.374~0.725,整体呈先降,再升,后降的趋势。敏感性指数和适应性指数均呈持续波动上涨趋势,脆弱性指数由2006年的0.327持续上升至2014年的1.081后,又下降至0.440。该县社会-生态系统脆弱性的潜在风险和致脆因子主要来源于系统的暴露度,牲畜密度、人均GDP、植被覆盖度是影响系统暴露度涨落的潜在风险因素,退牧还草工程及财政支出支持力度是社会-生态系统脆弱性提升的关键致脆因素。未来肃南县应放缓经济发展增速,提高第三产业GDP比重、加大财政支出力度、推进落实草原生态保护政策及其可持续治理长效机制,以降低社会-生态系统脆弱性的风险。  相似文献   

Identification Features of the Transition and Intermediate Layers in the Polygonal Peatlands in Northwestern Siberia     

Koroleva  E. S.  Slagoda  E. A.  Melnikov  V. P.  Babkina  E. A.  Khomutov  A. V.  Opokina  O. L.  Danko  M. M.  Tikhonravova  Ya. V. 《Doklady Earth Sciences》2021,498(2):465-470

Doklady Earth Sciences - The upper part of the subsurface component of the Earth’s cryosphere—polygonal peatlands—are considered in this paper. The polygonal peatlands are...  相似文献   

A Thermodynamic Indicator for Remote Assessment of the Productivity of a Hydrocarbon Reservoir     

Chebotareva  I. Ya.  Rode  E. D.  Dmitrievskiy  A. N. 《Doklady Earth Sciences》2021,500(2):857-860

Doklady Earth Sciences - The local productivity of a reservoir on the territory of a hydrocarbon field was assessed remotely using thermodynamic indicator of the state of the geological...  相似文献   

川西北下二叠统栖霞组微生物丘的发现及地质意义^*     

全子婷  谭秀成  张本健  唐浩  罗冰  杨迅  张亚  肖笛  汤艳玲 《古地理学报》2021,23(6):1110-1124

通过野外露头与钻井剖面的室内外分析,确认在四川盆地西北部(川西北)下二叠统栖霞组中发育有微生物丘,它们主要由凝块灰(云)岩、叠层灰(云)岩和微生物粘结颗粒灰(云)岩等组成。这些微生物碳酸盐岩发育较为典型的凝块、叠层、窗格、粘结等组构。微生物丘大小不一,实测高度一般为几十厘米至几米,宽度通常变化于几米至几十米之间,具有底平顶凸的典型丘形外貌,以发育向上变浅的沉积序列为特征,一般由丘基、丘核、丘盖3个微相组成,也可与颗粒滩共同构成微生物丘滩复合体。基于区域古地理背景和微生物丘特征的剖析,认为川西北地区栖霞期沉积环境总体受限,推测为半局限—局限台地环境,水深较浅,能量普遍不高;海平面频繁的相对升降变化和微生物丘的侧向迁移叠置,导致发育于缓坡背景下的碳酸盐岩台地极易受限,引起早期沉积物发生与丘滩发育密切相关的准同生期白云石化作用。因此,微生物丘滩复合体是栖霞组白云岩储集层发育的物质基础,台缘坡折带、台内缓坡折带和高地是栖霞组白云岩储集层发育的有利区带,这对寻找规模性层位不稳定的带状白云岩储集层具有重要的指导作用,并将大大拓展栖霞组白云岩储集层的勘探领域。  相似文献