Northern European summer temperature variations over the Common Era from integrated tree‐ring density records          下载免费PDF全文

JAN ESPER  ELISABETH DÜTHORN  PAUL J. KRUSIC  MAURI TIMONEN  ULF BÜNTGEN 《第四纪科学杂志》2014,29(5):487-494

  相似文献   

Diamond Discovered in Dangqiong Ophiolite, Western Yarlung-Zangbu Suture Zone, Tibet     

XIONG Fahui  YANG Jingsui  Robinson T.PAUL  XU Xiangzhen  BA Dengzhu  LI Yuan  LIJinyang  ZHANG Zhongming  RONG He 《《地质学报》英文版》2015,89(Z2):99-100

<正>The first diamonds from ophiolite were found in peridotite of Luobusa ophiolite along Yarlung Zangbu suture zone in Tibet,China(IGCAGS,1981),and then more and more diamonds found in harzgurgite(Bai et al.,1993;Yang et al.,2007a;Robinson et al.,2014;Xu et al.,  相似文献   

Diopside and Magnetite Exsolutions in Olivine from Lower Cr# Dunite in the Dongbo Ophiolite, Southern Tibet     

XIONG Fahui  YANG Jingsui  Robinson T PAUL  Dilek YILDIRIM  CHEN Yanhong  XUXiangzhen  LIU Zhao  TIAN Yazhou  ZHOU Wen  LAI Shengming  ZHANG Lan 《《地质学报》英文版》2015,89(Z2):101-101

<正>Diopside and magnetite exsolutions occur as oriented intergrowths within olivine of the lower Cr~#dunite in the Dongbo ophiolite,Tibet.The fresh lower Cr~#dunite has a mineral assemblage of olivine,spinel and diopside.The Fo content of its olivine is 90–92,which is lower than that of the higher Cr~#dunite lenses(Fo92-Fo94)without  相似文献   

Composition and Textual Characterization of Platinum-group Mineral (PGM) in Chromites from Zedang Ophiolite in Tibet, China     

GUO Guolin  YANG Jingsui  PAUL T. Robinson  XIONG Fahui  XU Xiangzhen  LIU Xiaodong  LIJinyang  LIU Zhao 《《地质学报》英文版》2015,89(Z2):16-17

<正>1 Introduction Platinum-group elements(PGE)are mainly concentrated in some specific minerals known as PGMs,which commonly occur in podiform chromites of ophiolites.In-situ PGM assemblages in chromites can provide valuable information on the physico-chemical nature of the parental melt(s)from which chromitite  相似文献   

Coastal permafrost landscape development since the Late Pleistocene in the western Laptev Sea,Siberia     

MARIA WINTERFELD  LUTZ SCHIRRMEISTER  MIKHAIL N. GRIGORIEV  VIKTOR V. KUNITSKY  ANDREI ANDREEV  ANDREW MURRAY  PIER PAUL OVERDUIN 《Boreas: An International Journal of Quaternary Research》2011,40(4):697-713

Winterfeld, M., Schirrmeister, L., Grigoriev, M. N., Kunitsky, V. V., Andreev, A., Murray, A. & Overduin, P. P. 2011: Coastal permafrost landscape development since the Late Pleistocene in the western Laptev Sea, Siberia. Boreas, 10.1111/j.1502‐3885.2011.00203.x. ISSN 0300‐9483. The palaeoenvironmental development of the western Laptev Sea is understood primarily from investigations of exposed cliffs and surface sediment cores from the shelf. In 2005, a core transect was drilled between the Taymyr Peninsula and the Lena Delta, an area that was part of the westernmost region of the non‐glaciated Beringian landmass during the late Quaternary. The transect of five cores, one terrestrial and four marine, taken near Cape Mamontov Klyk reached 12 km offshore and 77 m below sea level. A multiproxy approach combined cryolithological, sedimentological, geochronological (¹⁴C‐AMS, OSL on quartz, IR‐OSL on feldspars) and palaeoecological (pollen, diatoms) methods. Our interpretation of the proxies focuses on landscape history and the transition of terrestrial into subsea permafrost. Marine interglacial deposits overlain by relict terrestrial permafrost within the same offshore core were encountered in the western Laptev Sea. Moreover, the marine interglacial deposits lay unexpectedly deep at 64 m below modern sea level 12 km from the current coastline, while no marine deposits were encountered onshore. This implies that the position of the Eemian coastline presumably was similar to today's. The landscape reconstruction suggests Eemian coastal lagoons and thermokarst lakes, followed by Early to Middle Weichselian fluvially dominated terrestrial deposition. During the Late Weichselian, this fluvial landscape was transformed into a poorly drained accumulation plain, characterized by widespread and broad ice‐wedge polygons. Finally, the shelf plain was flooded by the sea during the Holocene, resulting in the inundation and degradation of terrestrial permafrost and its transformation into subsea permafrost.  相似文献   

RAINFALL AND TEMPERATURE ATTRIBUTES ON THE LESOTHO–DRAKENSBERG ESCARPMENT EDGE, SOUTHERN AFRICA     

WERNER NEL  PAUL SUMNER 《Geografiska Annaler: Series A, Physical Geography》2008,90(1):97-108

Located near the southeastern limit of Africa, the Lesotho‐Drakensberg and associated escarpment is the highest range of African mountains south of the massifs in Tanzania. At the escarpment summit and on the adjacent high peaks, the climate is generally interpreted as marginal periglacial yet few data, specifically rainfall and temperature, exist on record at these altitudes. Climatic data from two temporary field stations on the escarpment edge, one of which is the highest rainfall station yet on record in southern Africa, provide contemporary surface‐climate conditions. Mean annual rainfall recorded between 2001 and 2005 averages 767.8 mm at Sani Pass summit (three complete years), and 753.2 mm on Sentinel Peak (two complete years); these values are less than those recorded for the same period in the mountain foothills. Even though rainfall is slightly below long‐term rainfall averages for the area due to a marginally dry spell, the data show that earlier estimates of between 1000 mm and 2000 mm rainfall per annum on the escarpment are too high. A measured mean air temperature of 5.8°C at Sani Pass, however, falls within the range estimated for the escarpment summit. Frost cycles in air and at the soil surface are frequent in winter, but absent in soil for summer, and no long‐duration surface‐soil freeze was measured. Temperatures thus confirm the marginal periglacial nature as postulated for previously, but precipitation data indicate a dryer environment than anticipated. Palaeoenvironmental scenarios, notably arguments for former glaciation based on extrapolations from somewhat exaggerated contemporary precipitation values, thus require re‐consideration.  相似文献   

THE START AND EARLY HISTORY OF CHEMOMETRICS:SELECTED INTERVIEWS.PART 1     

PAUL GELADI Research Group for Chemometrics  University of Ume  S- Ume  SwedenKIM ESBENSEN Norwegian Computer Center  PB Blindern  N- Oslo  Norway 《地理学报(英文版)》1990,(5)

This is a first foray into the historical start and early years of chemometrics from about 1972 onwards.We have gathered interviews with three originators(Kowalski,Wold and Massart)as well as with aselected group of six other well-known chemometricians who gradually became active in the 1970s(Christie,Clementi,Hopke,Martens,Brown and Deming).The interviews include amongst a host ofsubjective recollections a succinct record of the key historical literature as highlighted by the interviewees'own rankings of‘earliest’and‘best’.A discussion of the most general commonalities in these interviews together with other historicalmaterial is presented in the second part of the paper.  相似文献   

Fossils explained 6: Bryozoans     

PAUL D. TAYLOR 《Geology Today》1986,2(5):152-153

  相似文献   

Drilling Blake Nose: the search for evidence of extreme Palaeogene–Cretaceous climates and extraterrestrial events     

KROON  NORRIS  KLAUS  IAN T. ALEXANDER  LEON PAUL BARDOT  CHARLES E. BARKER  JEAN-PIERRE BELLIER  CHARLES D. BLOME  LEON J. CLARKE  JOCHEN ERBACHER  KRISTINA L. FAUL  MARY ANNE HOLMES  BRIAN T. HUBER  MIRIAM E. KATZ  KENNETH G. MACLEOD  SANDRA MARCA  FRANCISA C. MARTINEZ-RUIZ  ISAO MITA  MUTSUMI NAKAI  JAMES G. OGG  DOROTHY K. PAK  THOMAS K. PLETSCH  JEAN M. SELF-TRIAL  NICHOLAS J. SHACKLETON  JAN SMIT  WILLIAM USSLERIII  DAVID K. WATKINS  JOEN WIDMARK  & PAUL A. WILSON 《Geology Today》1998,14(6):222-226

  相似文献   

The pre-Landnám fauna of Iceland: a palaeontological contribution     

PAUL C. BUCKLAND  DAVID W. PERRY  GÍSLI M. GISLASON  REW J. DUGMORE 《Boreas: An International Journal of Quaternary Research》1986,15(2):173-184

The origins of the Icelandic biota are discussed with particular reference to recent work on Coleopteran (beetle) and Trichopteran (caddis fly) fossils from deposits which are earlier than the arrival of man (Landnám) in the country. The hypothesis of survival through Pleistocene glaciations in refugia is discounted in favour of immigration on ice floes during Late Glacial/Early Holocene deglaciation. Consideration of the nature of the insect fauna and the extent of Late Glacial ice sheets, with the evidence from ocean circulation patterns, suggests a source area in the fjords of south-west Norway. The model is applicable to the origins of the biota on all the North Atlantic islands, east of the Davis Strait.  相似文献