Petrography and Geochemistry of Peridotite Xenoliths from Hannuoba and Significance for Lithospheric Mantle Evolution   总被引：3，自引：0，他引：3  

余淳梅  郑建平Griffin W L 《中国地质大学学报(英文版)》2006,17(1):25-33

Mantle-derived xenoliths and xenocrysts in Pale-ozoic diamondiferous ki mberlites in Mengyin (Shan-dong Province) and Fuxian (Liaoning Province) showthe presence of a cold,thick lithospheric mantle be-neath the North China craton ( NCC) in the MiddleOrdovician ( Griffin et al ., 1998 ; Menzies et al .,1993 ;Fan and Menzies ,1992) . However ,studies onmantle peridotites captured in the Tertiary to Neo-gene basalts of the NCC have revealed the existenceof a thin, hot and fertile lithosph…  相似文献   

Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary   总被引：5，自引：0，他引：5  

黄咸雨 焦丹鲁力强  黄俊华谢树成 《中国地质大学学报(英文版)》2006,17(1):49-54

INTRODUCTIONThe Permian-Triassic ( Tr/P) boundary , datedto be (251 .4±0 .3) Ma ago ,is marked by the mostdrastic mass extinction of organisms in the Phanero-zoic .In order to explore the pattern and the cause ofthe mass extinction,extensive research has been fo-cused on biostratigraphy , isotopic chronostratigra-phy , event stratigraphy , ecostratigraphy and se-quence stratigraphy (Payne et al .,2004 ; Reichowetal .,2002 ; Yin et al .,2001 ;Jin et al .,2000 ;Zhanget al .,1996 ,1995 ;…  相似文献   

湿度小的晴夜成霜分析          下载免费PDF全文

宋素蕊黄先成  王文英张兆国 《气象与环境科学》2007,30(B09):186-187

通过对滑县2005年12月两次低湿天气条件下成霜个例分析发现，在相对湿度较小的晴夜，只要地面或近地物有足够的辐射冷却条件、贴地层有适当的水汽供应，仍可有霜形成。  相似文献   

Erratum     

孙文娟  黄耀  陈书涛  邹建文  郑循华 《大气科学进展》2007,24(3):538-538

  相似文献   

Nonlinear Atmospheric and Climate Dynamics in China （2003-2006）： A Review     

丁瑞强  封国林  刘式达  刘式适  黄思训  付遵涛 《大气科学进展》2007,24(6):1077-1085

Recent advances in the study of nonlinear atmospheric and climate dynamics in China （2003 2006） are briefly reviewed. Major achievements in the following eight areas are covered： nonlinear error dynamics and predictability; nonlinear analysis of observational data; eddy-forced envelope Rossby soliton theory; sensitivity and stability of the ocean＇s thermohaline circulation; nonlinear wave dynamics; nonlinear analysis on fluctuations in the atmospheric boundary layer; the basic structures of atmospheric motions; some applications of variational methods.  相似文献   

四川省地面气象资料统计方法及产品简介     

毛建平  吕结 《高原山地气象研究》2007,27(3)

本文简明扼要地介绍了地面气象资料中常用要素的日、旬、月、年值的统计和缺测记录处理方法,对各要素原始观测数据和统计产品中常见的特定值做了较详细的说明.作者全面地介绍了四川省目前广泛用于服务的气候资料产品的文件类型、数据内容和数据格式.  相似文献   

农业重大气象灾害监测预警与控制技术研究     

郭建平  霍治国  张佳华  刘建栋 《中国气象科学研究院年报》2007,(1):8-13

1.北方农业低温冷害监测预警技术研究 "北方农业低温冷害监测预警技术研究"2007年在以下4个方面取得了较显著的进展.  相似文献   

Deformation Mechanism and Stability of a Rocky Slope   总被引：1，自引：1，他引：1  

黄润秋肖华波  巨能攀赵建军 《中国地质大学学报(英文版)》2007,18(1):77-84

A high slope is located on the side of the spillway at a hydropower station in Southwest China, which has some weak inter-layers inclining outwards. Parts of the slope show heavy weathering and unloading. There appeared deformation and tensile crack either on the surface or on the afteredge of the slope during excavation, and under a platform （elev. 488 m）, two levels of slopes collapsed on the downriver side. Based on the investigation in situ and the analysis of the geological structure, the conceptual model of deformation and failure mechanism was erected for this slope. Furthermore, the deformation characteristics were studied with FLAC^3D numerical simulation. Comprehensive analysis shows that the whole deformation of the slope is unloading rebound in certain depth scope and the whole body does not slide along any weak interlayer. In addition, two parts with prominent local deformation in the shallow layer of the slope show the models of ＂creep sfiding-tensile cracking＂ and ＂slidlng-tensile cracking＂, respectively. Based on the above analysis, the corresponding project of support and reinforcement is proposed to make the slope more stable.  相似文献   

滑坡地质灾害治理工程勘查的实践——以浙江省余姚市大俞村滑坡为例     

陈秀清  黄晓辉 《岩土工程技术》2007,21(2):105-108,F0003

通过大俞村滑坡灾害勘查方法、地质环境条件的论述,通过滑坡形成原因和机理的分析、滑坡体发生、发展趋势的预测、滑坡体的稳定性和危害程度的评价和计算等,阐述了滑坡地质灾害勘查的一般步骤和内容,对同类工作具有借鉴意义。  相似文献   

Flat rare earth element patterns as an indicator of cumulate processes in the Lesser Qinling carbonatites, China   总被引：1，自引：0，他引：1  

Cheng Xu  Ian H. Campbell  Charlotte M. Allen  Zhilong Huang  Liang Qi  Huan Zhang  Guishan Zhang 《Lithos》2007,95(3-4):267-278

The Lesser Qinling carbonatite dykes are mainly composed of calcites. They are characterized by unusually high heavy rare earth element concentrations (HREE; e.g. Yb > 30 ppm) and flat to weakly light rare earth element (LREE) enriched chondrite-normalized patterns (La/Yb_n = 1.0–5.5), which is in marked contrast with all other published carbonatite data. The trace element contents of calcite crystals were measured in situ by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). Some crystals show reduced LREE from core to rim, whereas their HREE compositions are relatively constant. The total REE contents and chondrite-normalized REE patterns from the cores of carbonate crystals are similar to those of the whole rock. The carbon and oxygen isotopic compositions of calcites fall within the range of primary, mantle-derived carbonatites. The initial Sr isotopic compositions (0.70480–0.70557) of calcites are consistent with an EM1 source or mixing between HIMU and EM1 mantle sources. However these sources cannot produce carbonatite parental magmas with a flat or slightly LREE enrichment pattern by low degrees of partial melting. Analyses of carbonates from other carbonatites show that carbonates have nearly flat REE pattern if they crystallize from a LREE enriched carbonatite melt. This implies that when carbonates crystallize from a carbonatite melt the calcite/melt partition coefficients (D) for HREE are much greater than the D for the LREE. The nearly flat REE patterns of the Lesser Qinling carbonatites can be explained if they are carbonate cumulates that contain little trapped carbonatite melt. Strong enrichment of HREE in the carbonatites may require their derivation by small degrees of melting from a garnet-poor source.  相似文献