A Great late Ediacaran ice age  

作　　者：Ruimin Wang Bing Shen Xianguo Lang Bin Wen Ross N.Mitchell Haoran Ma Zongjun Yin Yongbo Peng Yonggang Liu Chuanming Zhou 

机构地区：[1]Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education and School of Earth and Space Sciences,Peking University,Beijing 100871,China [2]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,and Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China [3]State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China [4]State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [5]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [6]School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China [7]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing 210008,China [8]School of Physics,Peking University,Beijing 100871,China

出　　处：《National Science Review》2023年第8期99-112,共14页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China (42225304 and 42293291);funded by a startup grant (101-162301202620) from China University of Geosciences (Wuhan)

摘　　要：The emergence of the Ediacara biota soon after the Gaskiers glaciation ca.580 million years ago(Ma)implies a possible glacial fuse for the evolution of animals.However,the timing of Ediacaran glaciation remains controversial because of poor age constraints on the∼30 Ediacaran glacial deposits known worldwide.In addition,paleomagnetic constraints and a lack of convincing Snowball-like cap carbonates indicate that Ediacaran glaciations likely did not occur at low latitudes.Thus,reconciling the global occurrences without global glaciation remains a paradox.Here,we report that the large amplitude,globally synchronous ca.571–562 Ma Shuram carbon isotope excursion occurs below the Ediacaran Hankalchough glacial deposit in Tarim,confirming a post-Shuram glaciation.Leveraging paleomagnetic evidence for a∼90°reorientation of all continents due to true polar wander,and a non-Snowball condition that rules out low-latitude glaciations,we use paleogeographic reconstructions to further constrain glacial ages.Our results depict a‘Great Ediacaran Glaciation’occurring diachronously but continuously from ca.580–560 Ma as different continents migrated through polar–temperate latitudes.The succession of radiation,turnover and extinction of the Ediacara biota strongly reflects glacial–deglacial dynamics.

关 键 词：carbonate carbon isotopes Shuram excursion inertial interchange true polar wander(IITPW) hankalchough glaciation Tarim Block 

分 类 号：P597[天文地球—地球化学] P512.2[天文地球—地质学] P343.6