摘要
本文报道了采集于希夏邦马峰的高山栎类(壳斗科栎属冬青栎组)叶片化石新材料。经过两次野外工作,探明该化石产地位于希夏邦马峰北坡海拔约5800m的达索普冰川南侧5号冰川冰舌前端,化石产于野博康加勒群下部砂砾岩为主的粉砂岩夹层中。这批新发现的化石具有壳斗科栎属高山栎类的典型特征,包括叶片椭圆形或长椭圆形,叶柄粗短,叶缘全缘或具齿,二级脉5~6对,与前人报道的希夏邦马峰高山栎类叶片形态完全一致。通过与高山栎类现生种和化石种形态的详细比较,并结合几何形态测量法进行定量分析,希夏邦马峰的高山栎类化石叶片定为古帽斗栎(Quercus preguajavifolia Tao)。高山栎类可能起源于青藏高原东南缘,伴随青藏高原的抬升而逐渐繁盛并扩散到高原周边地区。由于现今的高山栎类植物海拔分布范围大(900~4500m),且化石产地的地质年代尚不清楚,希夏邦马峰高山栎类的古海拔意义仍有待进一步完善。希夏邦马峰高山栎类化石的再次发现,不但有助于厘清化石产出的具体层位,还进一步丰富了该化石记录的形态特征并明确其分类学位置。相关认识将为进一步探究新生代喜马拉雅山脉中段的生物多样性演化与环境变化提供重要依据。
We reported alpine oak fossil leaves(the Heterobalanus group,Quercus section Ilex,Fagaceae)rediscovered on Mount Shisha Pangma.According to twice field investigations,the fossil site is located at the front of the No.5 glacier tongue on the south side of the Dasuopu Glacier at an altitude of about 5800m on the north slope of Shisha Pangma Peak.These fossils are from the siltstone interlayer dominated by sandy conglomerate in the lower part of the Yebokangjiale Group.These newly discovered fossil leaves have typical characteristics of alpine oaks,including oval or oblong leaf,thick and short petiole,entire or toothed leaf margin,and 5~6 pairs of secondary veins,which is completely consistent with the leaf morphology of alpine oaks from Mount Shisha Pangma reported previously.Through morphological comparison with living and fossil species in this group,as well as quantitative analysis combined with geometric morphometry,these fossil leaves from Mount Shisha Pangma were assigned to Quercus preguajavifolia Tao.Alpine oaks may originate in southeastern margin of the Qinghai-Tibetan Plateau,then thrive locally and spread into regions nearby accompanying by the uplift of the plateau.The implication of alpine oak fossil leaves from Mount Shisha Pangma on paleoelevation needs to be further investigated due to the present wide range and the uncertainty of these fossils.The rediscovery of alpine oak fossils from Mount Shisha Pangma not only helps to clarify the specific layers bearing these fossils,but also further enriches the morphological characteristics of this fossil record and its systematic position.This discovery would provide important basis for better revealing the evolution of biodiversity and environmental changes in the middle part of the Himalaya during the Cenozoic.
作者
苏涛
刘佳
陈琳琳
黄健
张馨文
吴飞翔
倪喜军
邓涛
周浙昆
SU Tao;LIU Jia;CHEN LinLin;HUANG Jian;ZHANG XinWen;WU FeiXiang;NI XiJun;DENG Tao;ZHOU ZheKun(MNR Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications,Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;CAS Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla 666303,China;School of Geographical Sciences,University of Bristol,Bristol BS81QU,UK;CAS Key Laboratory of Vertebrate Evolution and Human Origins,Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第5期1382-1393,共12页
Acta Petrologica Sinica
基金
第二次青藏高原综合科学考察研究(2019QZKK0705)
国家自然科学基金项目(41988101、42320104005)
云南省万人计划(YNWR-QNBJ-2019-086)联合资助.
