Magnetostratigraphy and paleoenvironmental significance of sediments from ANT29-P7-09 core in Prydz Bay,Antarctica  

作　　者：Zhong-yang Lin Xi-bin Han Xiang-long Jin Chao-hui Zhu Liang Yi Zheng-gang Li 

机构地区：[1]College of Marine Science and Technology,China University of Geosciences,Wuhan 430074,China [2]Key Laboratory of Submarine Geoscience,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China [3]State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China [4]Zhejiang Institute of Geological Survey,Hangzhou 311203,China

出　　处：《China Geology》2019年第4期493-500,共8页中国地质（英文）

基　　金：This work was financially supported by“Global change and air-sea interaction”(GASI-GEOGE-05,GASI-04-01-02,GASI-02-PAC-CJ07,GAST-GEOGE-03);National Natural Science Foundation of China(41576069,41576063);Zhejiang Qingshan Lake Innovation Platform for Marine Science and Technology(2017E80001).

摘　　要：Due to the unique geographical location and sensitive response to global climate changes,the Antarctic region plays an important role in paleoclimate researches,and attracts great attentions from various scholars.One 324 cm long sediment core(ANT29-P7-09)was obtained from Prydz Bay,Antarctica,during the 29th Chinese National Antarctic Research Expedition.Based on sediment particle size,TOC,δ13C analyses and magnetism data,the authors show that the dominant magnetic minerals are ferrimagnetic pseudo single domain(PSD)-multi domain(MD)magnetite.Variations in the paleoenvironmental records allow us to define 4 zones in the core.These zones outline the climatic variations in the region since the late Early Pleistocene,including a warm period,a transitional period,and a cold period.The magnetic particle assemblage varies with glacial-interglacial cycles.Abrupt changes in particle size,TOC content,and geomagnetism occur at 102–90 cm deep in the core,indicating a sudden warming in the Antarctic region,signaling the onset of the Holocene.The authors identified 3 additional climatic signals in the middle part of the core(232–162 cm)that show unexpected cooling events during the warm period in Prydz Bay,Antarctica.

关 键 词：Late Quaternary PALEOENVIRONMENT Climate change PALEOMAGNETISM Alternate cooling and heating Polar science EXPEDITION engineering PRYDZ Bay ANTARCTICA 29th Chinese National Antarctic Research EXPEDITION 

分 类 号：P941.61[天文地球—自然地理学] P532