Jurassic sedimentary features and tectonic settings of southeastern China   总被引：1，自引：0，他引：1  

LiangShu Shu  Yan Wang  JinGeng Sha  ShaoYong Jiang  JinHai Yu  YanBin Wang 《中国科学D辑(英文版)》2009,52(12):1969-1978

Two types of the Jurassic basins are distinguished in SE China based on their geodynamic features: the Late Triassic-Early Jurassic post-orogenic basins and the Middle Jurassic intra-continental extensional basins. The Lower Jurassic sequence shows a change from coarse- to fine-grained accumulation, suggesting a gradually deepening depositional environment from river to shore-lake and to deep-water lake. In contrast, the Middle Jurassic accumulation was changed from claystone to conglomerate along the coastal provinces in SE China, indicative of an initial crustal uplift. The Wuyi Mountains have been a paleogeograghic separating zone since the Middle Jurassic. The Late Jurassic strata are absent in most areas of SE China. A large-scale bimodal intra-continental rift-type volcanism occurred during the Middle Jurassic along a 40–60 km wide and 200 km long area in western Fujian and southern Jiangxi provinces, which is most likely the strongest volcanism in SE China since the Cambrian. The SHRIMP zircon U-Pb analyses on the rhyolite from the Dongkeng basin in the southern Jiangxi area yield a concord U-Pb age of 160±0.5 Ma, providing an upper age limit for the bimodal volcanic eruption. The analyses of the basin features indicate a change of the depositional environment during the interval from Middle Triassic to Late Triassic from a shallow-sea to an intra-continent in SE China in response to the strong collision between the Yangtze and North China Blocks. Sedimentary structures record a southward direction of Early Jurassic paleo-currents, reflecting that their source areas were to the north side. We propose that the Wuyi region was uplifted as early as Middle Jurassic, followed by a wide E-W-trending extended depression and bimodal volcanism in the western foot of the Wuyi Mountains. Presumably the uplift of the Wuyi domain changed the Middle Jurassic paleogeographic outline and formed the transformational tectonic regime from compression to extension as a tectonic response to the Pacific plate subduction.  相似文献   

美姑县乐约乡波阿莫超大型山体滑坡成因分析及防治对策   总被引：1，自引：0，他引：1  

沙德智  尹丕华  陈关顺 《四川地质学报》2000,(3)

在野外调查的基础上 ,对滑坡的形成条件 ,诱发因素 ,分布特点 ,危害程度及发展趋势等内容进行了全面评价 ,并提出了相应的防治措施。  相似文献   

气象用二等标准水银温度计检定结果不确定度分析   总被引：1，自引：1，他引：0  

温晓清  沙奕卓  雷勇 《气象科技》2008,36(2):240-243

二等标准水银温度计(简称温度计)检定结果的不确定度,直接影响温度量值传递的检定结果.针对我国省级气象计量单位现用的温度计量标准,从温度计的测温原理、检定方法、测量不确定度分量人手,根据JJFl059-1999<测量不确定度评定与表示>规范的分析方法,利用2007年检定数据,对一套温度计的检定结果进行不确定度评定.通过对检定结果的不确定度评定,梳理出一套清晰的分析步骤和科学方法,同时也为省级气象计量部门定期接受技术监督局的计量标准考核,提供误差分析范例.  相似文献   

基于生命周期的北京风味餐厅食物消费温室气体排放与减排案例分析     

张孟蓉  陈莎  李素梅 《气候变化研究进展》2021,17(2):140-150

减少粮食浪费不仅关乎粮食安全,而且对于温室气体减排与生态环境保护也至关重要.本文基于生命周期理论,构建了餐厅食物消费模型;然后通过对北京某风味餐厅的现场调研,量化评估了餐厅每人次产生的平均温室气体排放量,并对餐厅剩余食物产生的原因以及通过减少餐厅食物剩余带来的温室气体减排潜力进行了系统分析.研究结果表明,一个中等规模的...  相似文献   

紫刺参早期生长发育与体色形成的研究     

陈相堂  赵斌  李成林  韩莎  胡炜 《海洋科学》2019,43(6):95-101

本研究对紫刺参胚胎和幼体发育过程进行了显微观测,比较分析了其幼体早期生长情况与体色形成过程。结果表明:(1)在水温21.0±0.2℃条件下,紫刺参受精卵在受精10～15min后释放第一极体,5h 30min～6h 30min进入囊胚期, 18～20h发育成原肠胚; 30～34h进入耳状幼体阶段, 8～10d变态发育为樽形幼体, 12～14d发育成稚参;紫刺参胚胎和幼体发育时序与普通刺参无显著差异。(2)紫刺参早期发育中的樽形幼体发生率和附着变态率分别为58.4±4.7%和45.1±2.7%,高于普通刺参。(3)紫刺参浮游阶段后期随日龄增长表现出较普通刺参发育更快的优势,在日龄6～7d表现出显著差异(P0.05)。(4)紫刺参稚参在日龄35d前后自背部开始着色,50d～60d腹部开始着色,110d体表紫色转变近乎成参体色,完成变色过程。  相似文献   

Structural, curvature and electronic properties of Rh adsorption on armchair single-walled carbon nanotube     

杨培芳  吴锋民  滕波涛  刘莎  蒋健中 《海洋学报(英文版)》2010,29(9)

This paper systematically studies the rolling effects of the (n, n) single-wall carbon nanotubes (SWCNT) with different curvatures on Rh adsorption behaviours by using density functional theory. The outside charge densities of SWCNTs are found to be higher than those inside, and the differences decrease with the increase of the tube radius. This electronic property led to the discovery that the outside adsorption energies are higher than the inside ones, and that the differences are reduced with the increase of the tube radius. Partial density of states and charge density difference indicate that these strong interactions induce electron transfer between Rh atoms and SWCNTs.  相似文献   

Physical geographical background of the culture of traditional Chinese residential architecture     

储少莹  沙润  石高俊 《中国地理科学(英文版)》1999,9(1):26-32

ThetheSisistoexplainthebasicfactorsreferringtothetraditionalChineseresidentialarchitecturebasicallyfinalizedintheMingandQingdynastiesinthecountry'sspecificphysicalenvironment.Restrainedbyaxialfactors,itadaptsitselftotheself-sufficientnatural~nomy.Itisfiexiblydesigned,rsoablyfunctioned,economicallyconstructedandfeaturedbyremarkablelocalcharacteristics.IINFLUENCEOFCLIMATEONTRADITIONalarSIOCNTIAnANCnITh~arNinetyPercentofChina'spopulationinhabitstheeasternareawithinthedemarcati…  相似文献   

Matlab与高级编程语言在科学计算中的联合运用   总被引：2，自引：1，他引：1  

高立峰  陈飞  胡光武  殷翔  沙宏武 《地震地磁观测与研究》2007,28(2):111-114

在数字地震观测、地震预报及地震工程研究中,Matlab作为一套功能强大的科学计算及数学分析软件,得到广泛的应用.本文介绍如何将Matlab高效的数值计算和分析能力与高级编程语言结合的方法.  相似文献   

如何提高磁照图数字化的精度     

高立峰  陈晓明  陈飞  胡光武  殷翔  沙宏武 《地震地磁观测与研究》2007,28(4):32-34

CBMD是一款针对CB-3模拟磁照图进行数字化处理的软件,利用专业图像处理技术,对模拟磁照图进行数字化,由于模拟仪器调试及存放因素造成了图纸状况不尽相同,使用者在数字化处理过程中,根据不同的图,纸采用相应的方法进行处理,才能保证数字化结果精确度.本文就主要的几种影响处理精度的情况展开讨论,并提出具体的解决方法.  相似文献   

中国大陆西部强震前超低频磁场时空变化特征   总被引：3，自引：1，他引：2       下载免费PDF全文

冯丽丽  冯志生  樊文杰  管贻亮  贺曼秋  李霞  何畅  廖晓峰  艾萨?伊斯马伊力  袁文秀  李莎 《地震学报》2021,43(3):359-375

对2015年至2019年期间中国大陆西部的磁通门磁力仪秒采样观测资料开展了5—100 s频段的地磁垂直强度极化分析,并运用一些数学方法对分析结果进行了处理.结果显示,极化高值在经向和纬向均无明显的形态和幅值变化,且极化高值与地磁外源场扰动无关.在此基础上筛选出18次极化高值异常事件,利用插值方法得到了极化高值异常的空间...  相似文献