Distribution of glycerol dialkyl glycerol tetraethers in surface soils along an altitudinal transect at cold and humid Mountain Changbai: Implications for the reconstruction of paleoaltimetry and paleoclimate     

Yue Li  Shijin Zhao  Hongye Pei  Shi Qian  Jingjie Zang  Xinyue Dang  Huan Yang 《中国科学:地球科学(英文版)》2018,61(7):925-939

Glycerol Dialkyl Glycerol Tetraethers(GDGTs)serve as important tools for the quantitative reconstruction of paleoclimate and paleoecology in both continental and marine environments.Previous studies of GDGTs in the terrestrial environments focused primarily on the soils from the relatively warm-humid or cold-dry regions.However,it is still unclear how GDGTs respond to environmental variables in the cold-humid regions.Here,we collected soils along an altitudinal transect of Mountain(Mt.)Changbai,which has a typical cold-humid climate,to investigate the distribution of GDGTs and the response of GDGT-based proxies to changes in climate along the transect.The shift in the distribution of archaeal isoprenoidal GDGTs(iso GDGTs)revealed that the archaeal community varied significantly along the transect,which can affect the relationship between TEX_(86)and mean annual air temperature(MAT).In addition,the increased temperature seasonality at higher altitudes exerted a significant impact on TEX_(86).We proposed a global calibration of TEX_(86)for the growing season temperature reconstruction in the soil environments:T=85.19×TEX_(86)-46.30(R~2=0.84,p0.001).The methylation indices for 5-methyl branched GDGTs(br GDGTs)including MBT′_(5me)and MBT_(5/6),showed correlation with soil water content but no relationship with MAT,indicating that MBT′_(5me)and MBT_(5/6)from cold-humid environments may be not suitable for temperature and altitude reconstruction.In contrast,the recently developed p H proxies,including MBT′_(6me)(the methylation index for 6-methyl br GDGTs),CBT(Cyclisation index of Branched Tetraethers),IR_(IIa’)(Isomer ratio of IIa′)and IR_(IIIa′)(Isomer ratio of IIIa′)exhibited significant correlations with soil p H,suggesting these proxies can still be used for soil p H reconstruction in the coldhumid regions.The combination of MBT′_(5me)and MBT′_(6me)was strongly related to different types of climate(cold-dry,warmhumid,cold-humid,and warm-dry).For example,MBT′_(5me)0.65 and MBT′_(6me)0.55 are diagnostic for the cold-humid climate.Thus,the combination of MBT′_(5me)and MBT′_(6me)has the potential as a tool for the identification of different types of paleoclimate.  相似文献   

辽西建昌盆地油页岩发育特征及沉积环境     

王嗣敏  臧东升  王熙琼  李杰  韩嵩  李建中 《吉林大学学报(地球科学版)》2020,50(2):326-340

辽西地区建昌盆地含有丰富的油页岩资源。利用野外露头、钻井和化验分析等资料,分析油页岩分布、岩石学特征、地球化学特征和沉积环境。研究表明：油页岩发育于下白垩统九佛堂组一段、二段和三段,共计9个矿组,九佛堂组三段油页岩平均含油率高、厚度大;建昌盆地油页岩平均含油率为5.15%,平均灰分质量分数可达81.9%,平均发热量为5.19 kJ/g,全硫质量分数低,属于中品位高灰分中高发热量低硫型油页岩,开发时对环境污染小;碱厂、五家子、九佛堂、七道泉子和敖汉旗大青山含矿区累计油页岩查明技术可采资源8.22×10⁸ t,油页岩油查明可回收资源3.17×10⁷ t,建昌盆地预测油页岩资源9.27×10¹⁰ t。有机地化特征显示,建昌盆地油页岩有机质丰度较高,有机质类型主要为Ⅰ型和Ⅱ₁型,成熟度较低,处于未成熟—低成熟阶段。九佛堂组时期气候温暖湿润,来源于陆地和湖泊的有机质大量沉积于淡水—咸水的湖泊中,水底为还原环境,有利于有机质的保存。  相似文献   

2020年震情述评     

解孟雨  韩颜颜  臧阳  马亚伟  邓世广  王月  宋金  张小涛  姜祥华  史海霞  杨文 《中国地震》2021,37(1):249-254

1全球地震活动概况 据中国地震台网测定,2020年1月1日至12月31日,全球共发生6级以上地震82次,其中7级以上地震10次,最大地震为7月22日美国阿拉斯加州以南海域7.8级地震(图1).2020年全球7级以上地震频次较少、强度较低,全球已持续2年未发生8级以上地震.自2018年以来,中国大陆及周边已连续3年未发生...  相似文献   

基于高分遥感影像和POI的国土空间规划现状细化调查     

王艳阳  梁宇哲  罗伟玲  谢贻新  刘济坤 《热带地理》2020,40(4):649-658

当前国土空间规划现状细化调查尚处于外业核查与内业人工目视判读的方法探索阶段,缺乏较高效率、较高精准度的技术方法。因此,文章提出一种融合高分遥感影像图像信息和POI类别属性信息的数据特点,利用核密度分析和面向对象的信息提取方法,实现对国土空间规划现状地类的细化调查。通过对城镇中心和城镇边缘2个研究区进行建筑物提取和POI属性挂接,识别出各建筑物的使用功能类别,再与2019年第三次全国国土调查的国土利用现状图层进行空间叠加,完成对研究区的地类细化调查。结果表明,经样本误差矩阵评价建筑物提取结果具有较高分类精度,研究区的地类细化调查结果准确度达到86.2%,且大大提高了工作效率,为国土空间规划现状调查逐步走向精准化、高效化和智能化道路提供了方法和思路借鉴,具有重要的深入研究和应用推广意义。  相似文献   

Simulating compound flooding events in a hurricane     

Zhang  Yinglong J.  Ye  Fei  Yu  Haocheng  Sun  Weiling  Moghimi  Saeed  Myers  Edward  Nunez  Karinna  Zhang  Ruoyin  Wang  Harry  Roland  Aron  Du  Jiabi  Liu  Zhuo 《Ocean Dynamics》2020,70(5):621-640

Ocean Dynamics - Compound flooding is usually induced by the concurrence of coastal storm surge and heavy precipitation induced river flooding, with the former involving oceanic processes and the...  相似文献   

2023年震情述评     

韩颜颜  臧阳  马亚伟  解孟雨  王月  杨文  张小涛  宋金  姜祥华  史海霞  李飞  孟令媛 《中国地震》2024,40(1):271-278

  相似文献   

常州市气象预报业务工作平台   总被引：4，自引：1，他引：3  

董喜春  臧晓钟  束建  周霖华 《气象科技》2008,36(2):253-256

应用网页制作、办公自动化和图像处理软件,利用VB 6.O语言编程研制开发了常州气象预报业务工作平台.常州气象预报业务工作平台入库了1952～2003年常州气候整编资料,建立以资深预报员预报经验指标的天气系统模型,规范以"9210工程"和省市县网络互通互联为依托的预报业务工作流程.应用过程表明,该平台全面实现了人机交互作业方式进行检索、分析、制作和分发各种气象信息,有效地提高了工作效率和预报服务质量.  相似文献   

上明峪金矿地质特征及其与大河南岩体的关系   总被引：1，自引：0，他引：1  

朱永峰  冯克武  李福民  高秀丽  赖勇  臧启家 《矿床地质》1999,18(1):22-28

太行山北部的大河南岩体内部分布有一些金矿床及大量金矿化点,其中最具代表性的是上明峪金矿。大河南岩体侵位之后,遭受了强烈的构造运动,形成了近ＳＮ向和近ＥＷ向的两组断裂构造,断裂构造的活动使岩石强烈破碎形成破碎蚀变岩,岩浆热液萃取了花岗岩中的成矿元素并将其搬运至断裂带内,这种富含成矿元素的岩浆热液在断裂带中与天水混合,导致热液中的成矿元素沉淀形成矿化。上明峪金矿的形成是岩浆热液与天水共同作用的结果。  相似文献   

中国主要矿床数据库及其应用   总被引：2，自引：0，他引：2  

臧忠淑 《黄金地质》1996,2(4):62-66

新近完成的“中国主要矿床数据库”利用目前最优秀的高级关系数据库管理系统软件Ｆｏｘｐｒｏ２．５ｆｏｒ ｗｉｎｄｏｗｓ，以１９９３的底全国矿产储量统计表为基础，包含４０种主要常见矿产，共计大，中型矿床１９０２处，小型矿床３３８４处。数据库中不但载矿床的产地，坐标，储量，品位等矿床基本数据，而且还记录了矿床的类型，成因，成矿时代，围岩时代等矿床地质信息。  相似文献   

Some properties of unstable slip on rough surfaces     

Hartmut Spetzler  Guennadi Sobolev  Anatoli Koltsov  Arno Zang  Ivan C. Getting 《Pure and Applied Geophysics》1991,137(1-2):95-112

In this paper we report results obtained from various friction experiments under direct and oblique shear loading conditions. We used four rock types of varying brittleness (quartzite, anhydrite, limestone, pyrophyllite) with different surface roughness. The observations concentrate on the time span several milliseconds before dynamic failure occurs. During this period a premonitory, unstable phase of slip (slip 2) occurs. This differs importantly from a premonitory, stable process (slip 1) with durations of hundreds of seconds. On smooth surfaces slip 2 is usually observed with ductile rocks and less reliably with brittle rocks. Slip 2 is mostly accompanied by acoustic emissions, which increase in rate of occurrence and in magnitude until the stick-slip event. Foreshocks are observed during approximately 50% of the slip 2 events on rough surfaces. Foreshocks far exceed the acoustic noise level, which is also prevalent before stick-slip events on rough surfaces. In the direct shear experiment, where two faults are being loaded simultaneously, in about 20% of the cases precursory slip 2 was observed on the opposite side on which the final stick-slip event occurred.  相似文献