Cenozoic terrestrial palynological assemblages in the glacial erratics from the Grove Mountains, east Antarctica  

作　　者：Aimin Fang Xiaohan Liu Weiming Wang Feixin Huang Lianjun Yu 

机构地区：[1]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [2]Institute of Tibet Plateau Research, Chinese Academy of Sciences, Beijing 100029, China [3]Nanjing Institute of Geology and Palaeontology, Chinese Academy of Science, Nanjing 210008, China

出　　处：《Progress in Natural Science:Materials International》2009年第7期851-859,共9页自然科学进展·国际材料（英文版）

基　　金：provided work was carried out during the l998–2000 Chinese National Antarctic Research Expedi-tion;Logistical support was provided by the Antarctic Administration of China and the Chinese Academy of Sciences;financial support by National Natural Science Foundation of China (Grant Nos. 40631004 and40202034)

摘　　要：Fossiliferous glacial erratics have been found in moraines of the Grove Mountains, east Antarctica since 1998 by Chinese National Antarctic Research Expedition （CHNARE） teams. These erratics were derived from a suite of glaciogene strata hidden beneath the Antarctic Ice Sheet in the Lambert glacier drainage system, and thus provide a record of Cenozoic paleoenvironmental conditions and fossil biotas that are so far unknown from outcrops and drill cores in this region. By microfossil analysis, sparse Neogene spores and pollen grains are revealed, including： Toroisporis （Lygodiaceae）, Granulatisporites （Pteridaceae？）, Osmunda （Osmundaceae）, Polypodiaceae, Magnastriatites （Parkeriaceae）, Deltoidospora, Araucariaceae, Taxodiaceae, Podocarpus （Podocarpaceae）, Dacrydiurn （Podocarpaceae）, Pinus （Pinaceae）, Keteleeria （Pinaceae）, Picea （Pinaceae）, Tsuga （Pinaceae）, Chenopodiaceae, Artemisia （Asteraceae）, Asteraceae, Grami- neae, Fraxinoipollenites （Oleaceae）, Oleoidearurnpollenites （Oleaceae）, Oleaceae, Operculumpollis, Nothofagidites （Nothofagus）, Rhus, Quercus （Fagaceae）, Juglans （Juglandaceae）, Pterocarya （Juglandaceae）, Liquidambar （Hamamelidaceae）, Ulmus （Ulmaceae）, Ulmoidepites （Ulmaceae）, Tilia, Proteacidites （Proteaceae） and Tricolpopollenites; but without any marine diatoms. Most of the spores and pollen grains in the erratics are considered to originate from local sources except for some older exotic components that might be recycled from the basement sedimentary rocks by the ice sheet, so they are in situ sporo-palynological assemblages. Furthermore, since the source areas of the glaciogenic sedimentary rocks are assumed to be local or in the up glacier areas, the palynological assemblages in these erratics represent an inland terrestrial flora during a warmer period of the ice-sheet evolutionary history. The ages of these erratics are also discussed based on the occurrence of some diagnostic pollens such as the ArtemisFossiliferous glacial erratics have been found in moraines of the Grove Mountains, east Antarctica since 1998 by Chinese National Antarctic Research Expedition (CHNARE) teams. These erratics were derived from a suite of glaciogene strata hidden beneath the Antarctic Ice Sheet in the Lambert glacier drainage system, and thus provide a record of Cenozoic paleoenvironmental conditions and fossil biotas that are so far unknown from outcrops and drill cores in this region. By microfossil analysis, sparse Neogene spores and pollen grains are revealed, including: Toroisporis (Lygodiaceae), Granulatisporites (Pteridaceae?), Osmunda (Osmundaceae), Polypodiaceae, Magnastriatites (Parkeriaceae), Deltoidospora, Araucariaceae, Taxodiaceae, Podocarpus (Podocarpaceae), Dacrydium (Podocarpaceae), Pinus (Pinaceae), Keteleeria (Pinaceae), Picea (Pinaceae), Tsuga (Pinaceae), Chenopodiaceae, Artemisia (Asteraceae), Asteraceae, Gramineae, Fraxinoipollenites (Oleaceae), Oleoidearumpollenites (Oleaceae), Oleaceae, Operculumpollis, Nothofagidites (Nothofagus), Rhus, Quercus (Fagaceae), Juglans (Juglandaceae), Pterocarya (Juglandaceae), Liquidambar (Hamamelidaceae), Ulmus (Ulmaceae), Ulmoidepites (Ulmaceae), Tilia, Proteacidites (Proteaceae) and Tricolpopollenites; but without any marine diatoms. Most of the spores and pollen grains in the erratics are considered to originate from local sources except for some older exotic components that might be recycled from the basement sedimentary rocks by the ice sheet, so they are in situ sporo-palynological assemblages. Furthermore, since the source areas of the glaciogenic sedimentary rocks are assumed to be local or in the up glacier areas, the palynological assemblages in these erratics represent an inland terrestrial flora during a warmer period of the ice-sheet evolutionary history. The ages of these erratics are also discussed based on the occurrence of some diagnostic pollens such as the Artemisia, Chenopodiaceae and Nothofagus, which implies Neogene (most probably Pliocene). As a prelimin

关 键 词：East Antarctica Grove Mountains Glacial erratics Spores and pollen NEOGENE 

分 类 号：X522[环境科学与工程—环境工程] P343.6[天文地球—水文科学]