摘要
根据中国主要块体奥陶纪达瑞威尔期地层学、古生物学和岩石学的特点,本文主要论述了中国9个块体,其中包括5个主要块体(扬子克拉通、中朝克拉通、塔里木克拉通、拉萨地块和喜马拉雅北坡)中达瑞威尔晚期—凯迪期早期海相红层的分布、岩性特征和古动物群。它们的岩性特征:如红色灰岩;古生物群特征:如牙形石Pygodus serra动物群,P.anserinus动物群和Hamarodus europaeus动物群,珊瑚Yohophyllum动物群,以及头足类Sinoceras chinense动物群均十分相似或相同。这就充分阐明,中华古陆块群(包括扬子、中朝和塔里木克拉通等)与冈瓦纳古陆北缘古陆块群(包括拉萨地块和喜马拉雅北坡等)之间的关系十分密切,可能在此之前它们同属于冈瓦纳古陆。这对于阐明中华古陆块群与冈瓦纳古陆之间的关系具有重要意义。此外,还将海相红层分为两类:陆棚红层和大洋红层。陆棚红层主要见于寒武纪至三叠纪,大洋红层主要见于白垩纪至现代。
This papermainly describes the stratigraphical distribution, lithological characteristics and palaeontological faunas of the Late Darriwilian to Early Katian(Ordovician)marine red beds from the nine blocks,including five main blocks(Yangtze Craton,Sino-Korean Craton,Tarim Craton,Lhasa Block and north slope of Himalaya).Their lithological characteristics(such as red limestones)and palaeontolgical faunas(such as conodont Pygodus serra faunas,P.anserinus faunas and Hamarodus europaeus faunas,Coral Yohophyllumfaunas,and Cephalopod Sinoceras chinense faunas)of these marine red beds are very similar or same.The result has an important implication for understanding the relation between China oldland and Gondwanan oldland.Maybe it belonged to the same Gondwanan oldland before.It fully suggests that the China palaeoblocks including Yangtze Craton,Sino-Korean Craton and Traim Craton are closely related to the palaeoblocks including Lhasa Block and northern slope of Himalaya on the northern side of Gondwanan oldland.This result has an important significance for understanding the relation between China oldland and Gondwanan oldland.Besides,marine red beds can be subdivided into two groups:shelf red beds(SRB)and oceanic red beds(ORB).The former was deposited mainly from Cambrian to Triassic ages,and the latter was mainly from Cretaceous age to present.
作者
林宝玉
任纪舜
李明
武振杰
LIN Baoyu;REN Jishun;LIMing;WU Zhenjie(Key Laboratory of Stratigraphy and Palaeontology,Ministry of Nature and Resources,Beijing,100037;Institute of Geology,Chinese Academy of Geological Sciences,Beij ing,100037)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2018年第10期2002-2017,共16页
Acta Geologica Sinica
基金
中国地质调查局地质调查项目"中国及邻区海陆大地构造研究"(编号12120113013700)
"全国陆相地层划分对比及海相地层阶完善"(编号1212011120142)
"古生代若干无脊椎动物化石及地层调查"(编号1212001102000150010-08)
青年基金"湖南益阳南坝的笔石地层序列兼论特马道克阶的再分"(编号41402021)资助成果