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国家自然科学基金(40872141)

作品数:4 被引量:57H指数:3
相关作者:袁万明李希杨志强张招崇郝娜娜更多>>
相关机构:中国地质大学中国石油化工集团公司中国地质大学(北京)更多>>
发文基金:国家自然科学基金中国地质调查局地质调查项目更多>>
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青海东昆仑哈日扎-哈陇休玛——带构造活动的锆石裂变径迹定年分析
<正>地质背景大地构造位置属东昆中多旋回岩浆弧带,北接祁漫塔格-都兰新元古代-中古生代缝合带,南邻东昆中新元古代-早古生代缝合带。在成矿区带的划分上处于秦-祁-昆成矿域东昆仑成矿省伯喀里克-香日德印支期金、铅、锌、铜、稀...
袁万明张爱奎田承盛郝娜娜曹建辉程学芹王威陈小宁段宏伟
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安徽省黄山山体的隆升与剥露被引量:27
2011年
应用裂径迹技术研究黄山地质公景区隆升与剥露历史,揭示其演机.所获8个磷灰石裂径迹分析结,具有56,45~30和15Ma3个年龄组,与区内约85~50,45~30和24~5Ma形成多级古剥蚀面构造隆升剥蚀作用有关.景区曾经历3个阶段热演化历史,80Ma前第1阶段和13Ma后第2阶段冷却较快,从早到晚冷却慢速率分别为2.69,0.62和4.23℃/Myr;隆升速率分别为0.08,0.02和0.12mm/a;隆升幅度分别为1.14,1.57和4.00km.不同地段差异隆升明显,累计隆升幅度为4060~3950,3760~3490,3190~3070和2650m4个量级;地表隆升幅度化于450~2230m之间.区内平均剥蚀量为2340m,平均隆升量3400m,二者之差1060m是现在平均高程.
袁万明杨志强张招崇邓军
关键词:隆升剥蚀地质热历史磷灰石
Track Fading and Its Applications in Archaeology, Tectonics and Geothermal Chronology in China
2013年
Track fading is a basic phenomenon in track science and has been the source of informa- tion in geosciences. This article summarizes the knowledge of track fading and gives some examples of successful applications of track fading in archaeology, tectonics and geothermal chronology in China. The applications of track fading are classified into 5 modes: (1) mode of complete fading (annealing); (2) mode of partial fading; (3) use of the dependence of track fading on time and temperature; (4) use of the differences of track fading between coexisting minerals; and (5) use of fading-reduced track length. Track fading mechanisms hints that scientists in geothermal chronology should adopt microprobes for quantitative elemental analysis to determine the detailed chemical compositions of each mineral grain or at least of the grains from each position of geological structures in order that one becomes well aware of the relation between the track fading behavior and chemical compositions of the mineral used.
郭士伦袁万明陈宝流黄慰文刘顺生
关键词:ARCHAEOLOGYTECTONICS
东昆仑五龙沟花岗岩特征及其构造背景被引量:27
2014年
根据岩石学、地球化学等特征及MC-ICP-MS锆石U-Pb定年,对东昆仑五龙沟地区花岗岩进行了构造环境研究。黄龙沟中粒正长花岗岩具有高硅、高碱、相对富铝、高FeOt/MgO和104Ga/Al值、富集轻稀土、明显的Eu负异常、相对原始地幔明显富集Zr、Ga、Y和Hf等高场强元素并强烈亏损Ba、Sr、P和Ti元素的特征,为A型花岗岩。锆石U-Pb法获得206Pb/238U值加权平均年龄为416.9±1.3 Ma,是早古生代晚志留世造山旋回末后造山碰撞产物,标志晚志留世东昆仑造山旋回进入造山后碰撞阶段。岩金沟矿区东花岗闪长岩为典型准铝质钙碱性花岗岩,具有I型花岗岩稀土元素特征,为I型花岗岩,形成年龄为258.9±2.1 Ma,属于昆南断裂结束后、于晚二叠世开始南区巴颜喀拉地体与昆中区南昆仑地体间发生强烈的壳幔剪切作用的产物。
李希袁万明郝娜娜段宏伟陈小宁莫宣学张爱奎
关键词:花岗岩岩石地球化学特征锆石U-PB
Rare earth element geochemical constrains on metallogeny of Jiapigou gold belt, Northeast China被引量:3
2012年
Analyses of rare earth dements (REE) in gold-bearing quartz vein, granite and altered wall-rock (amphibolite) collected from Jiapigou gold belt in Southeast Jilin Province were conducted using inductively coupled plasma-mass-spectrometry (ICP-MS). The results in- dicated that the Jiapigou gold belt underwent two periods of gold mineralization: the earlier mineralization was related to the intrusion of Neoarchaean kaligranite, where the REE of earlier gold-bearing quartz veins and Neoarchaean kaligranites were typically featured by lower concentration and positive Eu anomaly; the later mineralization was related to the intrusion of the Yanshanian granite in Mesozoic, where the REE of later gold-bearing quartz veins and Yanshanian granites were typically featured by high concentration and negative Eu anomaly. However, the metallogenic mechanisms of the earlier and of the later gold mineralization periods were analogous, metallogenic materials were heterogenous with metallogenic fluids which mainly originated from magmatic hydrothermal fluids, mixed with metamorphic fluids; the metallogenic materials were mainly derived from the altered wall rock.
黄志新袁万明于海军
关键词:METALLOGENY
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