Vegetation and Climate Inferred from Pollen Record in East Asian Region During MIS 5: A Review     

Congwen Luo  Yuzhen Ma  Kai Wang  Dandan Li 《地球科学进展》2019,34(5):540-551

The last interglacial, Marine Isotope Stage 5 (MIS 5, about 71~128 ka BP), is the closest to modern interglacial period, in which there are identifiable patterns that could give us clues into what will happen in the future. Pollen analysis, the study of fossil pollen and spores, is one of the key methods for the reconstruction of past vegetation and environment. Pollen data from 23 sites in eastern Asian region were reviewed to document regional patterns of vegetation and climate change during MIS 5 and to understand the large-scale controls on these changes. The regional patterns of vegetation during MIS 5 can be compared with the present-day vegetation. The climate, inferred from pollen record, was not stable during MIS 5. The substages (5a, 5b, 5c, 5d and 5e) of MIS 5 can be identi?ed by pollen assemblages in some areas, which describe the imprint of orbital-scale climate oscillations. East Asian monsoons have significantly contributed to the environment of modern eastern Asian monsoon region during MIS 5. However, the climate in Japan is also affected by the ocean currents and westerly circulation. The climate of the Tibetan Plateau is controlled by interactions of competing factors, including Indian monsoons, westerlies, and topography. In eastern Asian region, particularly in arid and semi-arid regions, the high-resolution pollen records need to be further studied for the better understanding of the climate change.  相似文献   

东昆仑东段阿斯哈矿床石英闪长岩LA-ICP-MS锆石U-Pb定年及岩石地球化学特征     

李金超  贾群子  杜玮  栗亚芝  孔会磊  南卡俄吾  杨宝荣 《吉林大学学报(地球科学版)》2014,44(4):1188

阿斯哈石英闪长岩体位于东昆仑中央隆起带,侵入于古元宇金水口岩群中。岩体内产有阿斯哈大型金矿床,石英闪长岩与该区金矿形成具有密切的时空关系。采用锆石LA-ICP-MS、XRF和ICP-MS对石英闪长岩进行了定年以及地球化学测定。研究表明：该区石英闪长岩属钙碱性准铝质岩石,具有I型花岗岩的特征;其成岩年龄为（238.4±1.4） Ma;岩体稀土配分曲线几近一致,显示为同源岩浆演化特点,均表现出轻稀土相对富集的右倾特征,Eu具有弱的负铕异常;岩体明显富集大离子亲石元素,亏损高场强元素;具有明显的“TNT”负异常,显示出安第斯型岩浆弧火成岩构造属性;岩石Rb/Sr和Nb/Ta值介于地壳和地幔之间,并广泛发育暗色微粒包体,表明岩浆的壳幔混合成因。综上所述认为：阿斯哈金矿床石英闪长岩具有I型花岗岩特征,形成于印支期,具有壳幔混合的特征。  相似文献   

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洪卓众  邓健  孔令杰  柏飞 《大地测量与地球动力学》2013,33(5):83-85

????GAMIT???????????????ο???????????????????????????????????????????????????????????????????????TRACK??顣?????飬TRACK????в?????????????Saastamoinen???????GPS????????????????????  相似文献   

Phenanthrene Removal from Aqueous Solution on Sesame Stalk‐based Carbon     

Huoliang Kong  Jiao He  Huifang Wu  Hao Wu  Yanzheng Gao 《洁净——土壤、空气、水》2012,40(7):752-759

This work explored the performance of sesame stalk‐based carbon prepared at different carbonization temperatures and activated by potassium hydroxide in the removal of phenanthrene from an aqueous solution. At a carbon concentration of 10 mg/32 mL and a carbonization temperature of 700°C, the removal efficiency of phenanthrene approached 100%. Furthermore, with the presence of acenaphthene and naphthalene as co‐contaminants, the removal efficiency of phenanthrene by the prepared carbon was 99.60%, which was comparable to that by the commercial carbon. Hydrophobic interactions influenced phenanthrene removal, and partitioning appeared to be the dominant mechanism for phenanthrene removal from aqueous solution by sesame stalk‐based carbon. The results obtained from this work should provide insight into the reuse of agricultural residues, and also suggest a new avenue for the removal of polycyclic aromatic hydrocarbons from contaminated water utilizing carbon prepared from agricultural residue.  相似文献   

Metal concentrations in selected tissues and main prey species of the annulated sea snake (Hydrophis cyanocinctus) in the Hara Protected Area, northeastern coast of the Persian Gulf, Iran     

Rezaie-Atagholipour M  Riyahi-Bakhtiari A  Sajjadi M  Yap CK  Ghaffari S  Ebrahimi-Sirizi Z  Ghezellou P 《Marine pollution bulletin》2012,64(2):416-421

This study is the first detailed ecotoxicological study of the annulated sea snake, Hydrophis cyanocinctus. Concentrations of lead, cadmium, nickel and vanadium were evaluated in muscle, liver, kidney, skin and blood of the annulated sea snake (H. cyanocinctus) and in the whole bodies of its main prey species (Periophthalmus waltoni and Boleophthalmus dussumieri) in the Hara Protected Area, the Persian Gulf. The mean concentrations of lead and vanadium were highest in the kidney, which identified the kidney as a target organ for metals in sea snakes as it is in other reptilian groups. Mean concentrations of cadmium and nickel were highest in the liver and skin, respectively. Mean cadmium concentrations were significantly higher in the liver compared to prey species, which indicated that prey items may be a source of cadmium for the annulated sea snake in the study area. Data presented here may be considered as a baseline for further ecotoxicological studies in sea snakes.  相似文献   

中国对虾微卫星四重PCR技术的建立及其在模拟放流效果评估方面的应用   总被引：1，自引：0，他引：1  

李伟亚  王伟继  孔杰  金显仕  阮晓红  罗坤 《海洋学报》2012,34(5):213-220

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新疆测震台网常用地震定位方法对比   总被引：2，自引：2，他引：0  

孔祥艳  彭笑梅  陈向军 《地震地磁观测与研究》2015,(3)

选取2009年新疆测震台网记录的49个ML≥3.0地震,选用相同地震台及相同震相到时数据,分别采用单纯形、Loc Sat和Hypo Sat定位方法重新定位,从定位残差和震中位置对各定位效果进行对比,结果表明:对地震台站包围好的浅源地震,3种定位方法均适合;对地震台站包围不好的浅源地震,Loc Sat定位方法效果较好;对深源地震,Hypo Sat定位方法效果较好。  相似文献   

湘南道县辉长岩包体的锆石LA-ICP-MS定年、Hf同位组成及其地质意义     

孔华  许明珠  张强  唐宇蔷  赵佳进 《吉林大学学报(地球科学版)》2016,46(3):627-638

道县虎子岩碱性玄武岩筒产出较多的辉长岩包体。用于锆石定年的辉长岩样品的岩石化学特征显示：其K₂O、Fe₂O₃、TiO₂高于其他同类样品,稀土元素、微量元素总量也相对较高,样品的K^*值（2K_N/（Ta_N+La_N））为7.60>1,显示岩浆具有亲岛弧性质,反映源区地幔受到较强的交代作用;Nb^*值（2 Nb_N/（K_N+La_N））为0.11<1,反映基性岩浆侵入时受到了地壳混染;辉长岩中的锆石具有清晰的韵律环带,Th/U值=0.91~4.35,具有岩浆锆石的特征;锆石²⁰⁶Pb/²³⁸U加权平均年龄为（201.50±0.53）Ma,代表了辉长岩的结晶年龄;ε_Hf （t）值为-0.88~4.45,投点落入球粒陨石附近,暗示强烈的壳幔交换作用;Hf模式年龄平均为751 Ma,反映早期地壳对岩石源区的贡献。Hf同位素组成特征反映辉长质岩浆是在印支晚期局部拉张背景下,岩石圈上地幔上隆减压熔融的产物。  相似文献   

Characterization of genic microsatellite markers derived from expressed sequence tags in Pacific abalone (Haliotis discus hannai)     

李琪  束婧  赵翠  刘士凯  孔令锋  郑小东 《中国海洋湖沼学报》2010,28(1):46-54

Simple sequence repeat (SSR) markers were developed from the expressed sequence tags (ESTs) of Pacific abalone (Haliotis discus hannai). Repeat motifs were found in 4.95% of the ESTs at a frequency of one repeat every 10.04 kb of EST sequences, after redundancy elimination. Seventeen polymorphic EST-SSRs were developed. The number of alleles per locus varied from 2–17, with an average of 6.8 alleles per locus. The expected and observed heterozygosities ranged from 0.159 to 0.928 and from 0.132 to 0.922, respectively. Twelve of the 17 loci (70.6%) were successfully amplified in H. diversicolor. Seventeen loci segregated in three families, with three showing the presence of null alleles (17.6%). The adequate level of variability and low frequency of null alleles observed in H. discus hannai, together with the high rate of transportability across Haliotis species, make this set of EST-SSR markers an important tool for comparative mapping, marker-assisted selection, and evolutionary studies, not only in the Pacific abalone, but also in related species.  相似文献   

Analysis on the influencing factors of carbon emissions from energy consumption in China based on LMDI method     

Yang Yu  Qiuyue Kong 《Natural Hazards》2017,88(3):1691-1707

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