Geochemical evidence of paleogeography and paleoclimate during deposition of the 2nd Member of Kongdian Formation in Kongnan area     

Qinghua YAN  Jing SUN  Xudong ZHANG  Qinglong MENG  Man WANG 《世界地质(英文版)》2007,10(1)

The 2nd Member of Kongdian Formation has been made up of a large number of oil shale and mudstone in the Kongnan aera of Huanghua depression around the Bohai Bay. In the Kongnan area, the lake basins were very large and deep during the deposition of the 2nd Member of Kongdian Formation. During that period,the lakes were sealed, uncommunieated with the sea water and the paleoclimate was very warm and wet in Kongnan area. Analyzing the content of the trace element and the rare earth element, carbon and oxygen isotope in the disquisition, The authors prove the two views correct.  相似文献   

Geochronology and Geochemistry of Ore-related Granitoids in the Giant Gariatong Rb Deposit, Tibet and Implications for Rb Metallogeny in China     

LIN Bin  TANG Juxing  TANG Pan  SUN Yan  QI Jing  M. SANTOSH  XIE Jinling  DENG Shilin  LI Faqiao  XIE Fuwei  ZHOU Aorigele 《《地质学报》英文版》2024,98(1):83-103

Rubidium (Rb) deposits mostly occur in the South China and Central Asia orogenic belts and are often closely associated with highly differentiated granites. This study investigates a newly-discovered giant Rb deposit at Gariatong in the Central Lhasa terrane in Tibet. Detailed field studies and logging data revealed that the Rb mineralization mainly occurs in monzogranite and is related to greisenization. LA-ICP-MS U-Pb dating of zircon yielded ages of 19.1 ± 0.2 Ma and 19.0 ± 0.2 Ma for greisenized monzogranite and fresh monzogranite, respectively. The monzogranites are characterized as strongly peraluminous, with high contents of SiO2, Al2O3, K2O and Na2O as well as a high differentiation index. They are enriched in light rare earth and large ion lithophile elements with signi?cant negative Eu anomalies and depleted high field-strength elements. Petrological and geochemical features of these ore-related monzogranites suggest that they are highly fractionated S-type granites, derived from remelting of crustal materials in a post-collisional setting. The geochemistry of zircon and apatite points to a low oxygen fugacity of the ore-related monzogranite during the magma’s evolution. The discovery of the Gariatong Rb deposit suggests that the Central Lhasa terrane may be an important region for rare metal mineralization.  相似文献   

光谱对许氏平鲉消化代谢节律及生理应激研究          下载免费PDF全文

房莹莹  陈璐璐  刘松涛  孙飞  吴燕玲  李鑫  刘鹰  马贺 《海洋科学》2023,47(10):94-111

为探究不同光谱下许氏平鲉的消化代谢水平及外周激素节律,在5种光谱(红光、绿光、黄光、蓝光、白光,光周期12L∶12D)下,通过对许氏平鲉的血清、肠道、肝脏进行24 h (8:00,12:00,16:00,20:00,24:00)取样,结果显示:不同的光谱下许氏平鲉的消化代谢酶活性除胰蛋白酶(TRY)外均具有节律性,红光、黄光下α-淀粉酶(α-AMS)、脂肪酶(LPS)活性的峰值相位与白光组相比左移;胰蛋白酶活性无时间差异性;在绿光、黄光及红光下乳酸脱氢酶(LDH)活性的峰值相位与白光组相比发生左移,在五种光谱环境中,红、黄光影响消化酶活性峰值提前出现;丙酮酸激酶(PK)活性在绿、蓝及红光下峰值相位左移;己糖激酶(HK)的活性在绿、蓝、黄光下,其峰值相位与白光组相比发生左移,在五种光谱环境中,绿、蓝光影响代谢酶活性类峰值提前出现。许氏平鲉血清中褪黑素含量呈现昼低夜高分泌水平;皮质醇的含量表现为在白天降低,午夜显著升高至最高值后又持续降低。峰值相位的改变预示着生理节律的变动,以上结果表明不同光谱可以影响鱼类的生理代谢节律,在今后养殖过程中需要充分考虑光谱对养殖生物的生物学作用,进而制定更为合理的光照条件。  相似文献   

信息安全实验管理系统的实现及其系统中安全问题的解决     

肖霞  周安民  孙立鹏 《成都信息工程学院学报》2007,22(1):101-104

B／S模式的应用系统都要面对安全的问题，身份认证和访问控制是实现计算机安全的主要手段。介绍了基于Web的信息安全实验管理系统，分析了系统的体系架构和功能，针对B／S模式的安全威胁，采用了两个方案实现身份认证和访问控制。  相似文献   

模糊评判法在公路黄土洞穴发育程度分区中的应用   总被引：1，自引：1，他引：0  

孙萍  彭建兵  陈立伟 《地球科学与环境学报》2007,29(4):393-399

阐述了影响黄土洞穴形成的黄土湿陷性、崩解性、地质构造、节理裂隙、微地形地貌和水文及气候条件等工程地质特性和地质因素;在公路沿线地区,公路工程质量及人类活动也是黄土洞穴形成的影响因素。洞穴发育程度分区预测和评价极具复杂性、随机性和模糊性,为此,在对各影响因素分析的基础上,借助模糊综合评判法,对黄土区公路沿线洞穴发育程度分区进行了研究。与实际情况对比分析表明,预测评价结果合理可靠,可作为黄土区已建公路洞穴灾害的防治依据。  相似文献   

Transcript profiles of mitochondrial and cytoplasmic manganese superoxide dismutases in Exopalaemon carinicauda under ammonia stress     

任海  李健  李吉涛  刘萍  梁忠秀  吴建华 《中国海洋湖沼学报》2015,33(3):714-724

  相似文献   

Seasonal variations in fouling diatom communities on the Yantai coast     

杨翠云  王建华  于洋  刘苏静  夏传海 《中国海洋湖沼学报》2015,33(2):439-446

Fouling diatoms are a main component of biofilm,and play an important role in marine biofouling formation. We investigated seasonal variations in fouling diatom communities that developed on glass slides immersed in seawater,on the Yantai coast,northern Yellow Sea,China,using microscopy and molecular techniques. Studies were conducted during 2012 and 2013 over 3,7,14,and 21 days in each season. The abundance of attached diatoms and extracellular polymeric substances increased with exposure time of the slides to seawater. The lowest diatom density appeared in winter and the highest species richness and diversity were found in summer and autumn. Seasonal variation was observed in the structure of fouling diatom communities. Pennate diatoms Cylindrotheca,Nitzschia,Navicula,Amphora,Gomphonema,and Licmophora were the main fouling groups. Cylindrotheca sp. dominated in the spring. Under laboratory culture conditions,we found that Cylindrotheca grew very fast,which might account for the highest density of this diatom in spring. The lower densities in summer and autumn might result from the emergence of fouling animals and environmental factors. The Cylindrotheca sp. was identified as Cylindrotheca closterium using18 S rDNA sequencing. The colonization process of fouling diatoms and significant seasonal variation in this study depended on environmental and biological factors. Understanding the basis of fouling diatoms is essential and important for developing new antifouling techniques.  相似文献   

2009-2013年普里兹湾表层水体中生物硅含量的年际变化及其与全球气候事件的关系     

扈传昱  韩正兵  孙维萍  陈际雨 《海洋与湖沼》2015,46(2):285-294

利用中国南极科学考察期间获得的颗粒物样品,对南大洋普里兹湾海域水体中生物硅的含量分布及年际变化情况进行了分析。研究结果显示:在2013年夏季普里兹湾表层水体中生物硅含量在0.38—8.62μmol/dm3之间变化,平均为1.55±1.86μmol/dm3。生物硅在67°S以南湾内区域表层水体中的含量明显高于67°S以北的湾外区域,最大值出现在普里兹湾陆架区,生物因子是表层水体生物硅含量分布的主控因子。根据不同年份即25、26、27、28、29次南极科学考察期间获取的数据研究显示,普里兹湾表层水体中生物硅含量存在明显的年际差异。历史数据分析结果表明,气候事件对普里兹湾海冰变化有明显的影响,因而对相应年份该海域浮游植物数量和种群结构也会产生一定的影响,从而导致表层水体中生物硅含量的年际差异。  相似文献   

不同条件下哈维氏弧菌(Vibrio harvey)对墨吉明对虾(Fenneropenaeus merguiensis)致病性研究     

赵吉臣  王刚  邓中宁  陈兆明  孙成波 《海洋与湖沼》2015,46(6):1413-1419

为研究墨吉明对虾弧菌病的防控方法, 本文通过人工注射感染的方式, 研究不同数量哈维 氏弧菌及在不同温度、盐度、pH、不同硝酸氮、亚硝酸氮和氨氮浓度条件下哈维氏弧菌对墨吉明对 虾的致病性的影响。结果表明: 当人工感染哈维氏弧菌数量为3.16×10⁸ CFU 时, 24 h 内对虾累计死 亡率为96.67%; 哈维氏弧菌数量为3.16×10⁶ CFU 以上, 实验结束时, 对虾累计死亡率都超过了 50.00%.在20-32℃ 范围内, 随着温度升高哈维氏弧菌致病力增强, 并且低温组(20℃ 实验组与 26℃ 实验组)对虾累计死亡率显著低于高温组(32℃ 实验组)(P<0.05).在温度为(24±1)℃ 时, 盐度为 20 时对虾累计死亡率处于较低水平; 在温度为(24±1)℃, 盐度为(22±1)时, 96 h, pH 为8.0 时对虾 累计死亡率最低, 并且与另外两个实验组差异显著(P<0.05); 温度为(24±1)℃, 盐度为(22±1), 硝 酸氮对感染哈维氏弧菌的墨吉明对虾有胁迫作用; 在亚硝酸氮浓度(1.0-10.0 mg/L)、氨氮浓度 (0.5-1.5 mg/L)范围内, 哈维氏弧菌对墨吉明对虾的致病性, 随着浓度升高而增强。本实验为墨吉明 对虾弧菌病的防控提供了理论基础。  相似文献   

水杨酸对蛋白核小球藻(Chlorella pyrenoidosa) 生长及抗逆相关基因的影响   总被引：1，自引：0，他引：1  

丁聪聪  徐年军  张琳  孙雪  李亚鹤 《海洋与湖沼》2015,46(6):1451-1460

以蛋白核小球藻(Chlorella pyrenoidosa)为研究对象, 首先克隆了热激蛋白70(HSP70)和磷 酸甘油酸激酶(PGK)基因全长序列, 然后研究了0-20μg/mL 水杨酸对高温胁迫下HSP70 和PGK 基 因表达, 以及蛋白核小球藻生长、可溶性糖和蛋白含量的影响。结果获得了蛋白核小球藻HSP70 基 因的cDNA 序列2405 bp, 包括60 bp 的5'-非编码区(UTR)、1959 bp 的开放阅读框(ORF)和386 bp 的3'-UTR 和PGK 基因的cDNA 序列1664 bp, 包括35 bp 的5'-UTR, 1398 bp ORF 和231 bp 3'-UTR. 序列比较和分析表明该蛋白核小球藻HSP70 序列与其它绿藻的同源性高达83%-91%, PGK 为 70%-75%.荧光定量PCR 结果显示随着水杨酸浓度的增加, HSP70 和PGK 的表达量在12h 和24h 均有所增加, 而在10 μg/mL 水杨酸浓度下表达量最大, 12h 时分别为对照组的2.57 倍和1.56 倍, 24h 则为1.71 倍和1.79 倍。1-20μg/mL 水杨酸可促进该藻的比生长速率、可溶性糖和蛋白含量的升高。 本文结果表明一定浓度水杨酸对高温胁迫蛋白核小球藻有缓解作用, 且5 和10 μg/mL 水杨酸的效果 最显著。  相似文献