对X射线荧光光谱分析检出限公式的认识     

马旻  刘江斌 《甘肃地质》2011,(2):73-75

对X射线荧光光谱分析检出限问题进行了探讨,通过实验指出行标DZ/T 130-2006有关检出限计算公式的不足在于对测量时间的过分依赖,使检出限这一重要参数失去实际意义,需要重新科学定义。  相似文献   

贵州梵净山白云母花岗岩锆石年代、铪同位素及对华南地壳生长的制约   总被引：7，自引：0，他引：7       下载免费PDF全文

王敏  戴传固  王雪华  陈建书  马会珍 《地学前缘》2011,18(5):213-223

贵州梵净山地区位于＂江南造山带＂西南段,出露地层为中新元古界梵净山群、青白口系板溪群、南华系及古生界地层。梵净山群已强烈褶皱,被青白口系板溪群角度不整合覆盖。浅色白云母花岗岩侵位于褶皱的梵净山群中;锆石原位LA-ICP-MS分析结果显示,其形成时代为（838.5±1.5）Ma。地球化学分析结果表明,其A/CNK值〉1....  相似文献   

巨野煤田矿坑热水特征及其开发利用     

李公岩  刘红  李霖  贾德旺  张敏 《山东地质》2011,(9):31-35

根据矿坑热水水质、水量、水温,立足矿山实际,因地制宜提出了综合开发利用方式：赵楼煤矿矿坑水可向巨野县城提供洗浴用水;彭庄煤矿矿坑水宜作为种植冬暖式大棚蔬菜的热源;经热能梯级利用后,郭屯煤矿矿坑水可与低氟水混合后作为水产养殖用水;龙堌煤矿矿坑排水量大,距巨野县城较近,经降酸处理后可作为城镇工业供水水源。矿坑水经全部梯级利用后,可节省地下水资源及煤炭资源费2 493.84万元/a。  相似文献   

U–Pb and Hf isotopic study of zircons from migmatised amphibolites in the Cathaysia Block: Implications for the early Paleozoic peak tectonothermal event in Southeastern China     

Long-Ming Li  Min Sun  Yuejun Wang  Guangfu Xing  Guochun Zhao  Shoufa Lin  Xiaoping Xia  Lungsang Chan  Feifei Zhang  Jean Wong 《Gondwana Research》2011,19(1):191-201

Amphibolites occur in a number of localities in the Cathaysia Block, some of them have been migmatised and their protoliths represent basaltic magmas erupted in various tectonic settings. Four migmatised amphibolites were collected from Jiangxi and Fujian Provinces. Cathodo-luminescence images of zircons extracted from the representative amphibolites show unzoned or sector-zoned structure. LA-ICP-MS analysis indicates that most zircons have high Th/U ratios and yield U–Pb zircon ages of 446 ± 5, 435 ± 2, 434 ± 4 and 423 ± 2 Ma, respectively. Lu–Hf isotopic analysis on these zircons gives Hf model ages ranging from 900 to 1200 Ma. Based on lithological observations and previously published geochronological data, we interpret that these U–Pb ages record an important tectonothermal event that led to the migmatization. This early Paleozoic (Caledonian) tectonothermal event in the Southeastern China has a great tectonic implication for the evolutionary history of the Cathaysia Block.  相似文献   

塔里木盆地志留纪脊椎动物的特征及其 沉积相、古环境     

王士涛  郭宪璞  金若谷  赵民 《地质通报》2011,30(8):1220-1227

20世纪80年代以来,在塔里木盆地西北部柯坪—巴楚地区发现了许多志留纪脊椎动物化石,其中包括无颌类、软骨鱼类等。这些化石的发现和深入研究揭示了塔里木盆地志留纪时期的古地理位置及其格局,进一步确定了塔里木陆块在该时期的古生物地理区应属于塔里木-扬子古脊椎动物生物地理区系。记述了采自塔里木盆地中心2个钻井岩心中的3件早志留世脊椎动物化石,其中1件化石为无颌类的新科、新属、新种。同时对志留纪时期塔里木陆块的沉积特征、古环境进行了分析和探讨。上述研究为油气勘探提供了有价值的科学依据。  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987111000156   总被引：1，自引：0，他引：1  

Xiaohuan Xi  Zhongfang Yang  Yujun Cui  Shumei Sun  Chengguang Yu  Min Li 《地学前缘(英文版)》2011,2(2):115-123

Employing the Unit Soil Carbon Amount (USCA) approach, soil carbon storage was calculated across the Northeast Plain of China based on the Multi-purpose Regional Geochemical Survey conducted in 2004 – 2006 (MRGS). The results indicated that the soil organic carbon (SOC) storage in topsoil (0 – 0.2 m), subsoil (0 – 1 m) and deep soil (0 – 1.8 m) was 768.1 Mt, 2978.4 Mt and 3729.2 Mt with densities of 3327.8 t/km2, 12,904.7 t/km2 and 16,157.5 t/km2, respectively. These values were consistent with national averages, whereas the soil carbon densities showed a clear increasing trend from the southern area of the Northeast Plain (Liaoning), to the middle (Jilin) and the northern Plain (Heilongjiang) — particularly in terms of topsoil carbon density, which increased from 2284.2, to 3436.7 and 3861.5 t/km2, respectively. In comparison to carbon data obtained from the Second National Soil Survey in 1984 – 1986 (SNSS), the topsoil SOC storage values from the MRGS were found to have decreased by 320.59 Mt (29.4%), with an average annual decline of 16.0 Mt (l.73%) over the 20 years. In the southern, middle and northern areas of the plain, soil carbon densities decreased by 1060.6 t/km2, 1646.4 t/km2 and 1300.2 t/km2, respectively, with an average value of 1389.0 t/km2 for the whole plain. These findings indicate that the decrease in soil carbon density varied according to the different ecosystems and land use types. Therefore, ratios of soil carbon density were calculated in order to study the carbon dynamic balance between ecosystems, and to further explore distribution characteristics, as well as the sequestration potential of SOC.  相似文献   

人工岛对海湾水环境影响数值研究     

陆敏  孙志国  孙大鹏 《海洋工程》2011,29(3):88-95

针对大连湾人工岛的建设预案,在人工岛多种长度及宽度的组合条件下,运用MIKE21 flow model模块进行人工岛建设前、后的海湾流场及污染物扩散运动模拟,探讨研究嵌入人工岛后海湾水体交换、污染物扩散及污染物存留率的变化规律,进而评价人工岛对海湾水环境的影响.在不同的人工岛功能定位前提下,综合考虑人工岛和水环境的诸多因素,分别给出了可供规划参考的人工岛推荐方案.  相似文献   

长江干流有机碳的时空输运特征及三峡工程对其影响     

王敏  张龙军  桂祖胜 《中国海洋大学学报(自然科学版)》2011,41(1)

2006-04,2008-04,2008-05沿长江干流采集表层水样,并于2006-05～2007-05在下游大通站进行每月2次、为期1 a的连续观测,测定溶解有机碳(DOC)、颗粒有机碳(POC)及总悬浮物(TSM).结果表明:长江重庆以上江段DOC浓度较低,重庆至河口由于人为污染排放DOC表现出高值;干流POC与TSM显著正先关,POC%(TSM)随TSM含量增大呈负指数关系下降.大通站有机碳浓度及通量均表现出明显的季节性,2006-06～2007-05全年经大通站进入河口的DOC、POC通量分别为1.17×106tC和1.88×106tC,其中洪季(5～10月)输运的有机碳占到总有机碳的70%,组成以颗粒态为主.三峡水库135 m及156 m蓄水后,泥沙在库区的沉降作用显著影响长江POC的输运特征及入海通量;从目前观测结果看,三峡库区DOC浓度并没有表现出明显的升高趋势,可能与水库运行时间尚短有关.  相似文献   

大菱鲆亲子鉴定的微卫星多重PCR技术建立及应用     

苗贵东  杜民  杨景峰  徐营  樊廷俊  陈松林 《中国海洋大学学报(自然科学版)》2011,(Z1):97-106

用8个微卫星标记组合建立了2个微卫星多重PCR体系,对大菱鲆7个人工选育家系进行了系谱认证、亲子鉴定和遗传多样性研究。2个多重PCR体系中8个微卫星位点共检测到等位基因49个,每个位点等位基因数为3~8个。根据已知亲本及子代基因型,成功推断出了3个缺失亲本的基因型。在双亲未知的情况下2个多重PCR的8个微卫星位点累积排除概率是96.58%,已知1个亲本时累积排除率为99.71%,亲子鉴定准确率为96.42%。采用70个个体进行双盲验证,利用UPGMA法对7个家系的70个体进行了聚类分析,同一家系95.71%的个体聚类分析结果与系谱来源一致。Cervus 2.0软件亲子鉴定结果表明亲子鉴定准确率为92.86%。2个多重PCR体系的建立为大菱鲆不同家系混养后的亲子鉴定、系谱分析和分子辅助家系管理提供了技术手段。  相似文献   

低温环境下消化污泥和玉米秸秆强制通风堆肥过程中物理化学和生物学指标的研究     

高孟春  王子超  胡波  王敏  赵从从  杨慧心  田颖  王步英 《中国海洋大学学报(自然科学版)》2011,41(11):13-17

在低温环境下采用强制通风堆肥技术对消化污泥和玉米秸秆进行了堆肥化处理。在环境温度为9～15℃和初始C/N比为19.61情况下,第4天堆体温度达到最高温度60℃,堆体温度保持55℃以上时间为9d。污泥堆肥过程中总有机碳和C/N比下降明显,而NO3--N和重金属含量升高。pH值、电导率、NH4+-N、纤维素酶和脲酶的活性呈先增加后降低的趋势。种子发芽指数在第35天达到84.14%。研究结果表明,消化污泥和玉米秸秆强制通风堆肥在35d达到了腐熟要求。  相似文献