西藏冈底斯带措勤地区则弄群火山岩锆石U-Pb年代学格架及构造意义   总被引：29，自引：12，他引：17  

朱弟成  周肃  莫宣学  赵志丹  许继峰  周长勇  孙晨光  王立全  陈海红  董国臣 《岩石学报》2008,24(3)

大规模的则弄群火山岩呈带状近东西向展布于西藏冈底斯带中北部地区.对出露状况较好的措勤地区则弄群火山岩进行了锆石U-Pb定年,以建立其年代学格架便于区域对比.措勤地区则弄群火山岩多数锆石具有生长振荡环带,部分锆石显示核边结构.在措勤达雄北西部上覆于中二叠统下拉组灰岩的1件则弄群英安岩样品的LA-ICP-MS锆石U-Ph年龄为130±1Ma,1件则弄群流纹岩样品的SHRIMP锆石U-Pb年龄为129±3Ma;在措勤达雄北东部与下白垩统多尼组碎屑岩呈断层接触的1件则弄群英安岩样品中的锆石具有两组LA-ICP-MS锆石U-Pb年龄,最年轻的一组(包括增生边)为121±1Ma,较老的一组(包括核部)为131±1Ma;在措勤南西部1件则异群流纹岩样品的LA-ICP-MS锆石U-Pb年龄为111±1Ma,与措勤地区花岗岩类的侵位时代相当.这些高质量的锆石U-Pb年代学数据表明,措勤地区的则弄群火山作用很可能开始于约130Ma,停息于约110Ma,持续时间约20Ma.区域对比表明,东西延伸约1000km的则弄群火山作用同时发生在约130Ma.区域上目前的年代学数据结合同时代岩浆作用的分布特征表明,冈底斯带中北部地区早白垩世岩浆作用不太可能由新特提斯洋壳向北的低角度或平板俯冲产生.  相似文献   

养殖牙鲆细菌性病原分离与鉴定     

莫照兰  陈师勇  谭训刚  徐永立  张培军 《海洋科学集刊》2003,(45):163-168

牙鲆(Paralichthys olivaceus)是我国北方沿海地区的重要经济养殖品种，目前已形成工厂化生产规模。随着养殖密度的增加以及海水污染程度的日益严重，养殖牙鲆出现了各种疾病(曲凌云等，2000； Mo Zhaolan et al.，2001).造成了巨大的经济损失。 1999~2000年，山东省荣成、威海、青岛胶南及黄岛地区养殖牙鲆大面积发病，疾病发生时间多在每年的6~11月.病鱼多为3~10月龄。本文作者对以上牙鲆发病地区进行了临床病症的调查，并进行了病原的分离和初步鉴定。  相似文献   

鳗弧菌(Vibrio anguillarum)M3菌株生长条件及其对蛋白酶产量的影响   总被引：2，自引：5，他引：2  

陈师勇  张培军  莫照兰  邹玉霞  张振冬  徐永立 《海洋与湖沼》2004,35(2):159-166

采用体外测定细菌浓度、胞外产物(ECP)蛋白含量和蛋白酶活力的方法，进行了鳗弧菌M3菌株在2216E培养基中的培养条件研究。结果表明，该菌株用固体培养基培养至24h左右，可得到较高的菌体浓度、ECP蛋白含量和蛋白酶活力。采用响应面分析方法设计实验，用SAS统计软件分析数据，得到NaCl浓度、pH值和温度对菌体生长及蛋白酶产量影响的回归模型。在2216E培养基的基础上，添加不同氮源、碳源物质以及不同浓度蛋白胨进行生长研究。结果表明，胰大豆蛋白胨能促进菌体生长及ECP蛋白分泌；NH4Cl与酪蛋白水解物可抑制蛋白酶的产生；牙鲆肌肉匀浆对菌体、ECP蛋白产量和蛋白酶产生有不同程度的促进作用；培养基中蛋白胨浓度为4％时菌体量与ECP蛋白含量达最高值，在蛋白胨浓度为2％时蛋白酶分泌量已稳定；1％的葡萄糖、蔗糖、甘油均能显著地提高菌体及ECP蛋白产量，却抑制了蛋白酶的产生。  相似文献   

Variational iteration solving method for El Nio phenomenon atmospheric physics of nonlinear model     

MO Jiaqi  *  WANG Hui  LIN Wantao  LIN Yihua. Anhui Normal University  Wuhu  China. Division of Computional Science  E-Institute of Shanghai Universities  Shanghai Jiaotong University Shanghai  China. Chinese Academy of Meteorological Sciences  Beijing  China. State Laboratory of Numerical Modeling for Atmospheric Sciences  Geophysical Fluid Dynamics  Institute of Atmosheric Physics  Chinese Academy of Sciences  Beijing  China 《海洋学报(英文版)》2005,(5)

1 IntroductionThe El Ni’o atmospheric physics oscillation is anabnormal phenomenon involved in the tropical Pacificocean- atmosphere interactions. Studies on the El Ni(ophenomenon are very attractive (Lin et al., 2000; Linet al., 2001, 2002; Wang, 2001; Feng et al., 2001;Feng et al., 2002; Liu et al., 2002; Wei and Chen,2003; Xie et al., 2002; Zhu et al., 2002; Pu et al.,2003; Gu et al., 2004; Yu and Liu, 2004). Lin and Mo(2004), Mo and Lin (2004) and Mo et al. (2004) alsostudied a s…  相似文献   

Gradation affects basic mechanical characteristics of Chinese calcareous sand as airport subgrade of reefs     

Shen Yang  Xue Shen  Hanlong Liu  Huayang Ge  Xiaoxi Rui 《Marine Georesources & Geotechnology》2020,38(6):706-715

Abstract

Construction of the reefs in the South China Sea is a significant foundation to the secure stability and economic development of China. The construction of an airport runway is necessary for this realization. The calcareous sand is the main primary material in the runway construction. A certain type of calcareous sand near a certain reef of the South China Sea was studied in this paper. To investigate this specific calcareous sand, quartz sand was used as a reference for comparison. Microscopic 3-D imaging, compression and triaxial tests were conducted to test the micro, squeezing and shear properties. The effect mechanism of gradation on the calcareous sand’s compressibility and shear characteristics are discussed from a mesoscopic viewpoint using 3-D morphology. Calcareous sand particles are multiangular and flatter in comparison with quartz sand. The larger the particle sizes are, the more different the two sands’ morphologies are. The compressibility of calcareous sand is greater, and the effect of the coarse fraction (5–1?mm) content in the gradation plays the most significant role in this feature. When the coarse particles’ content is less than 25% and the mass ratio of the middle and fine particles (M) is constant, there is the worst coarse fraction content causing the calcareous sand to be most likely compressed. The worst coarse fraction content decreases with the increase in M, and an empirical formula is proposed. When the gradation, relative density and confining pressure are the same, the peak shear stress and strain of calcareous sand are all at a high level. The effect of confining pressure is manifested in calcareous sand. The shear strength and dilation of calcareous sand are also most affected by the medium coarse fraction (5–0.25?mm) content.  相似文献   

红海榄人工幼苗藤壶分布特征研究   总被引：4，自引：0，他引：4  

莫竹承  范航清  何斌源 《热带海洋学报》2003,22(1):50-54

调查了广西珍珠港人工红海榄幼苗叶片上藤壶分布的特征。结果显示,在一年生幼苗叶片上藤壶的空间分布格局总体上为聚集分布。分布型因海水盐度的变化而变化,在高潮盐度Sh<20.21的海水区域内,藤壶趋向于随机分布,反之则表现为聚集分布。大约在分点潮高潮位以下,平均每日潮水浸淹时间超过5.6h的潮滩上藤壶的危害明显加再,影响了红海榄幼苗的正常生长。  相似文献   

Rapid detection of virulent protease secreted by Vibrio anguillarum by dot enzyme-linked immunosorbent assay     

ZHANG Zhendong  ZHANG Peijun  MO Zhaolan  WANG Chunling  YU Yang 《海洋学报(英文版)》2005,24(4):155-161

Dot enzyme-linked immunosorbent assay （dot-ELISA）, indirect ELISA and Westem blot were performed to detect the virulent protease secreted by Vibrio anguillarum which was isolated from the diseased left-eyed flounder, Paralichthys olivaceous. Sensitivity results showed that dot-ELISA is a more sensitive, rapid and simple technique for the protease detection. The minimal detectable amount of protease is about 7 pg in the dot-ELISA test, while 7.8 ng in the indirect ELISA and 6.25 ng in the Westem blot respectively. Protease could be detected 2 h after incubation of V. anguillarum in the 2216E liquid medium but enzyme activity was very low at that period. From 6 to 12 h, the amount and enzyme activity of protease increased markedly and reached maximum at stationary phase. Analysis of serum samples periodically collected from the infected flounders showed that after 2 h of infection by V. anguillarum, the pathogenic bacteria could be detected in the blood of the infected flounders but no protease was found. It was 5-6 h after infection that the protease was detected in blood and then the amount increased as infection advanced. Quantitative detection of protease either incubation in the medium or from the blood of infected flounders could be accomplished in virtue of positive controls of quantificational protease standards （＂marker＂） so that the alterations ofprotease secretion both in vitro and in vivo could be understood generally. In addition, the indirect ELISA and dot-ELISA were also performed to detect V. anguillarum cells. Results indicated that the sensitivity of indirect ELISA to bacteria cells is higher than that of the dot-ELISA, and that the minimal detectable amount is approximately 10^4 cell/mL in the indirect ELISA, while 10^5 cell/mL in the dot-ELISA.  相似文献   

黄海地质构造与油气资源   总被引：13，自引：4，他引：13  

李廷栋  莫杰 《海洋地质前沿》2002,18(11):4-7

概述了南，北黄海盆地地质构造特征，盆地的形成与演化，分析研究了油气地质特征与成藏条件；对黄海各盆地和隆起区可能具有找油气远景的新领域，新层位和新类型，提出一些探讨性的认识。  相似文献   

广西英罗港红树林区鱼类多样性研究   总被引：10，自引：0，他引：10  

何斌源  范航清  莫竹承 《热带海洋学报》2001,20(4):74-79

1999年4个季度研究了广西英罗港红树林区的林缘和潮沟潮水中鱼类的种类多样性。共发现有鱼类76种，隶属于36科59属。其中林缘有42种，潮沟有54种，4个季度出现的鱼类种数潮沟多于林缘。两生境种类相似性指数较低，表现为：春季＞冬季＞夏季＞秋季。各季节均出现的鱼类在林缘有6种，占全年总种数的14．3％；潮沟有8种，占全年总种数的14．8％；两个季节间共有种最多的：在林缘是夏季与冬季，在潮沟是夏季与秋季，它们的相似性指数也最大。全年在林缘和潮沟均出现的鱼类仅有1种。本区鱼类以暖水性种占绝对优势；但潮沟暖温性种多于林缘。在生态类型上，林缘以中上层种类较多，潮沟则以底层种类较多。  相似文献   

土地更新调查成果与二次调查数据衔接问题的探讨   总被引：2，自引：0，他引：2  

黄承忠  莫昭安  梁凉 《地理空间信息》2008,6(5)

结合广西第二次土地调查工作实际,论述了在调查工作中对原土地更新调查成果的利用,对需补充、完善的调查内容逐一进行了分析和阐述,并对如何处理两次调查数据衔接中存在的问题提出了一些建议和看法。  相似文献