高山一带寿山石的主矿物研究     

张敬阳  陈孟娟 《福建地质》2007,26(2):72-77

应用化学分析、X射线衍射、红外光谱、扫描电镜、差热热重等分析手段对高山寿山石进行了主矿物的研究.X射线衍射分析表明,高山石的主要矿物成分是迪开石,其主要衍射峰为0.412 4 nm、0.379 9 nm和0.232 6 nm,测得其结晶度指数介于1.29～1.4,分析认为高山石为结晶度中等的有序迪开石.红外光谱图中,高山石的高频区出现3 696.39 cm-1,3 652 cm-1和3 620.35 cm-1的吸收峰,是典型的迪开石羟基吸收带分裂形成的3个吸收峰.差热热重实验分析也证实了高山寿山石的主矿物种属.另外,扫描电镜观察显示高山寿山石以细鳞片状和假六方板状为主.  相似文献   

农业气象灾害分析子系统与业务主系统的集成处理   总被引：2，自引：1，他引：1       下载免费PDF全文

王宏博  冯锐  戴萍  张玉书  纪瑞鹏  武晋雯  周恩泽 《气象与环境学报》2010,26(6):31-34

基于ArcGIS 9.2的平台功能,在ArcGIS二次开发语言VBA环境下研制开发了"农业气象灾害分析子系统"。结果表明:通过对系统通用功能进行较大的扩充改进,增强了系统服务于省级农业气象灾害分析的稳定性、可调控性与可移植性。与"省级现代农业气象业务服务平台"主系统集成,完善了农业气象服务平台灾害监测预测方面的分析功能,可为省级农业气象干旱、洪涝等灾害监测预测提供分析处理和参考依据。  相似文献   

江苏东海CCSD主孔超高压变形与折返变形的叠加关系     

唐哲民  陈方远 《岩石学报》2009,25(7):1639-1644

位于苏鲁超高压变质地体南部的中国大陆科学钻探工程（CCSD）主孔岩石经历了超高压变形及多期折返变形。第一期折返变形为伸展折返变形,榴辉岩发生角闪岩相退变质作用,没有新生面理或线理的发育,基本保留了超高压阶段的S-L组构,并有显示熔融体特征的强退变榴辉岩发育。第二期折返变形为SEE-NWW向挤压折返变形,超高压变形期形成的不同岩石类型在本期变形中表现出不同的叠加变形现象,榴辉岩类岩石早期形成的S倾面理主体部分转为SEE倾,但拉伸线理产状与超高压变形期的近SN走向基本一致,反映早期面理沿NNE轴向的重褶作用,局部又被向SEE缓倾的韧性剪切带切割;而片麻岩类岩石在超高压变形期形成的S-L组构的主体部分已被新生成的总体向SEE缓倾的S-L组构置换,反映早期面理不仅重褶,而且大部分再度发生韧性剪切变形,具SEE向NWW的逆冲剪切指向,矿物普遍重新定向。第三期折返变形发育具NWW向SEE正滑剪切指向的韧性剪切带,并伴随大量“Z”型褶皱构造的发育。第四期折返变形以NWW向SEE正滑的张性或张扭性脆性断裂活动为主。探讨了苏鲁超高压变质地体折返变形的力学机制及CCSD主孔岩石面理变化的形成机制。  相似文献   

川西前陆盆地中侏罗统千佛岩组沉积体系研究     

曾熠 《云南地质》2011,30(1):118-121

千佛岩组发育冲积扇、曲流河、三角洲和湖泊沉积。曲流河发育洪泛平原和河道两个亚相;三角洲发育三角洲前缘、三角洲平原及前三角洲三个亚相;湖泊相则发育浅湖和滨湖亚相;冲积扇分出扇中和扇端两个亚相。龙门山系周期性推覆构造活动是川西前陆盆地沉积作用及层序发育的主控因素。  相似文献   

A Comparative Analysis of Main Modes of Global-scale Sea Surface Temperature on Multiple Time Scale     

Peng Liu  Zhihong Jiang  Huaying Yu  Yi Qin 《地球科学进展》2014,29(7):844-853

Using the HadISST data from 1880 to 2009, removed the signal of global warming in one hundred year. The results show that, there were the significant interannual and interdecadal oscillation signal at the eastern Pacific and north Pacific and north Atlantic, especially the decadal oscillation in the south of eastern equatorial Pacific cannot be ignored. We found there are three major global-scale signals by using the Empirical Orthogonal Function (EOF) analysis on global sea surface temperature, the first mode is (ENSO-like/PDO-like) Pacific pattern, the second mode is (AMO-like) the north Atlantic pattern and the third mode is (ENSO Modoki-like/CP ENSO-like) Center Pacific Ocean pattern. In particular, the third mode is the performance of Center Pacific El Niño-Southern Oscillation in the global mode. There are significant signals in interannual and interdecadal scales, in the unfiltered conditions, the three modes can explain 34% of total variance contribution. Above the interdecadal scale, the sum of three modes variance contribution is 61%. In various time scales, the three signals and the average global temperature has a connection, especially the influence of the first and second mode is the most important, in the decadal scale, the sum of the first and second modal variance contribution is 50%. Since 2005, there is no significant signal of global warming may be associated with the simultaneous decline of the first two modes.  相似文献   

1981—2013年6—7月江淮地区切变线及暴雨统计分析     

马嘉理  姚秀萍 《气象学报》2015,73(1):883-894

利用第5次耦合模式比较计划(CMIP5)提供的39个全球气候模式模拟的1961—2005年逐月500 hPa位势高度场资料,以及同期美国国家环境预测中心再分析资料,通过经验正交函数分解提取主要模态,基于泰勒图方法、概率密度函数的Brier评分和显著性评分指标,探讨CMIP5模式对东亚500 hPa高度场主要模态时空结构的模拟能力,寻求具有较好东亚环流型态模拟能力的气候模式以及模拟较好的主模态。结果表明:(1) CMIP5模式能够模拟出东亚500 hPa高度场主要模态,且各模式对冬季主要模态时空结构的模拟能力都高于夏季。(2) 各模式对冬季模态(西太平洋遥相关型)模拟能力最强,第3模态最差,对冬季主要模态空间结构模拟较好的模式为IPSL-CM5B-LR、MPI-ESM-P、CMCC-CMS、FGOALS-g2、HadGEM2-ES;夏季第1模态空间结构模拟能力最强,其次分别为第2模态和东亚-太平洋型(简记第3模态),西太平洋遥相关型较差,对夏季主要模态空间结构模拟较好的模式为ECEARTH、CanESM2、CMCC-CM、GFDL-ESM2G、IPSL-CM5A-MR。(3)对主要模态时间系数概率密度函数特征的模拟评估表明,模式对冬季第2模态概率密度函数的模拟较好,其次为西太平洋遥相关型,其主要模态时间系数的概率密度函数模拟较好的模式为CESM1-FASTCHEM、HadGEM2-ES、INM-CM4、GISS-E2-H、BCC-CSM1-1;模式对夏季第2模态时间系数的概率密度函数模拟较好,其次分别为第3模态、西太平洋遥相关型,其主要模态时间系数概率密度函数模拟较好的模式为CCSM4、HadGEM2-CC、GFDL-CM3、MRI-CGCM3、NorESM1-M。(4)综合时空结构模式模拟能力,对冬季主要模态模拟较好的前5个模式为HadGEM2-ES、IPSL-CM5B-LR、CESM1-FASTCHEM、INM-CM4、BCC-CSM1-1;夏季前5个模式为ECEARTH、CMCC-CM、CCSM4、CANESM2、MIROC5。  相似文献   

地球磁场的西向漂移   总被引：9，自引：1，他引：8  

徐文耀  魏自刚 《地球物理学进展》1999,14(2):42-57

西向漂移是地球主磁场长期变化最重要的特点之一，任何一个成功的地磁场起源理论都反能否合理地解释西漂作为检验标准之一。本文简要回顾地磁场西漂硬件历史，对计算西漂的各种方法和结果作了对比分析，对这些方法的物理依据，特点及局限性进行了讨论。  相似文献   

Late Devensian and Holocene relative sea‐level changes on the Isle of Skye,Scotland, UK     

Katherine A. Selby  David E. Smith 《第四纪科学杂志》2007,22(2):119-139

Detailed litho‐ and biostratigraphical analyses from three coastal sites in contrasting coastal settings on the Isle of Skye, Scotland, UK, reveal evidence for several changes in relative sea level during the Late Devensian and Holocene. At the start of the record, relative sea level in the area was high at ca. 12 500 ¹⁴C (ca. 14 800 cal.) yr BP but then fell, reaching a low point during the Younger Dryas, at ca. 11 000–10 000 ¹⁴C (ca. 13 000–11 600 cal.) yr BP, when a rock platform, correlated with the Main Rock Platform, was formed. In the early–middle Holocene, relative sea level was rising by ca. 8000 ¹⁴C (ca. 8800 cal.) yr BP and in northeast Skye a lagoonal surface, correlated with the Main Postglacial Shoreline, was formed at ca. 6600 ¹⁴C (ca. 7500 cal.) yr BP. By the late Holocene, relative sea level was again falling, but a rise, registered at at least two sites, began probably before ca. 4000 ¹⁴C (ca. 4500 cal.) yr BP, and a second lagoonal surface in northeast Skye, correlated with the Blairdrummond Shoreline, was formed, although by ca. 3000 ¹⁴C (ca. 3200 cal.) yr BP relative sea level in the area had resumed its downward trend. The pattern of relative sea‐level changes disclosed is compared with evidence elsewhere in Scotland. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Transitional I S type characteristic in the Main Range Granite,Peninsular Malaysia     

《Journal of Asian Earth Sciences》2013

The dominantly Triassic Main Range Granite of Peninsular Malaysia that occurs west of the Paleo-Tethyan Bentong–Raub suture zone was regarded exclusively as an S-type granite. The Main Range dominantly biotite granites are of batholithic proportion and host one of the world’s largest tin provinces. The S-type characteristics include high initial ⁸⁷Sr/⁸⁶Sr isotope ratios (>0.710), a narrow range in silica, presence of ilmenite and occasional cordierite and andalusite, and the presence of pelitic or quartzose meta-sedimentary xenoliths. However, the present review shows that the Main Range Granites also have many features that are more characteristic of I-type granites such as the very large scale of plutonism, the presence of primary titanite and amphibole, occurrence of hornblende-bearing mafic enclaves, increasing peraluminosity towards the more differentiated end-members of the suite and decreasing P₂O₅ with increasing SiO₂ contents. The moderately peraluminous nature of the bulk Main Range Granite, without containing cordierite, Fe–Mg garnet or sillimanite, is consistent with derivation from a meta-sedimentary protolith that was itself undersaturated with respect to Al₂SiO₅.  相似文献   

山东省沂沭河干流水环境质量评价与趋势分析   总被引：1，自引：0，他引：1  

张涛  刘洪林  张勇  吴启鲁 《地下水》2003,25(3):183-185

根据多年水质监测资料，对沂沭河干流水环境质量进行综合评价；采用Kendall季节检验趋势分析法，对沂沭河水系水环境质量变化趋势进行了探讨，为治理改善沂沭河水环境质量提供科学依据。  相似文献