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A New Fauna——Qinghezhen Fauna——from the Northern Margin of the North China Platform

Acta Geologica Sinica(English Edition) 1990年第4期64卷 443-459,468-470页

作者： Liu Xiaoliang wang dongfang shenyang institute of geology and mineral resources, Chinese Academy of Geological sciences {2. {3. shenyang institute of {2. and {3. {4. Chinese Academy of Geological Sciences

In the Inner Mongolia axis and Jiaoliao anteclise along the northern margin of the North China *** has been found that the strata formerly considered as Archaean and Proterozoic are in fact an ophiolite suitesimilar to the Early Palaeozoic Ondor Sum Group in the Northern Geosyncline region of China. The stratahave been named in northern Liaoning as the Qinghezhen Group. The emphasis of this paper is on the discus-sion of the simall shelly fossils found in the siliceous rocks in the upper part of the Qinghezhen Group. Thisophiolite suite stretches in an E-W direction for about 1000 km along the northern margin of the North ChinaPlatform. in which 15 fossil localities with stable stratigraphic horizons have been discovered. In this paper. 4.ypes. 7 genera (including 5 new ones) and 10 species (including 8 new ones and 1 new subspecies) aredescribed, which are collectively referred to as the Qinghezhen Fauna. The characteristics of these fossils are:shell form simple. the maximum length not exceeding 4.mm. with obvious shell wall and wall ornaments. TheQinghezhen Fauna is comparable in shell structure of some genera and species with the Meishucun Fauna inSouth China, but differs from the latter in having only monotonous fossil groups developed in a distinctly va-ried ecological environment. The two faunas may belong to the same evolutionary stage of the Early Cambrianbut have developed parallelly in different regions. The existence of the Qinghezhen Fauna represents an impor-tant biological event in the Early Cambrian in the Northern Geosyncline region of China. The discovery of theQinghezhen Fauna will bring new knowledge and profound influence to a series of problems on basic geologyand mineral deposit prospecting such as the Cambrian faunas. biogeographical povincialism in China and thegeotectonic features of the northern margin of the North China Platform.

关键词： A New Fauna from the Northern Margin of the North China Platform

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华南埃迪卡拉(震旦)系年代地层划分方案及其层型剖面

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地质学报 2024年第6期98卷 1649-1666页

作者：陈启聪唐烽张恒高林志任留东赵明胜李玉兰张立军赵萌生陈建书王约焦德光刘军平中国地质科学院地质研究所北京100037 中国地质大学(北京)地球科学与资源学院北京100083 沈阳师范大学古生物学院辽宁沈阳110034 贵州地质工程勘察设计研究院贵州贵阳550081 河南理工大学资源环境学院河南焦作454003 中国地质调查局昆明自然资源综合调查中心云南昆明650100 贵州省地质调查院贵州贵阳550081 贵州大学资源与环境工程学院贵州贵阳550025 云南省玉溪师范学院云南玉溪650031 云南省地质调查局云南昆明650051

依据华南峡东标准剖面的地球化学和多重地层划分对比资料,2.14.全国地层委员会发布了埃迪卡拉(震旦)系年代地层划分暂定方案。该方案近年来已经受到来自生物地层学和同位素地质年代学研究所获得的新成果、新认识的挑战,迫切需要推出新... 详细信息

依据华南峡东标准剖面的地球化学和多重地层划分对比资料,2.14.全国地层委员会发布了埃迪卡拉(震旦)系年代地层划分暂定方案。该方案近年来已经受到来自生物地层学和同位素地质年代学研究所获得的新成果、新认识的挑战,迫切需要推出新的具体划分方案,建立新的阶一级层型剖面,作为华南乃至全国埃迪卡拉系的对比划分标准。为此,本文建议在埃迪卡拉纪以生物地层学为主确立年代地层单元的划分标准,提出在华南分别建立埃迪卡拉系上统和下统的顶阶层型剖面,即江川阶和瓮会阶。本文推荐了这两阶的相关顶、底界线层型剖面及标志化石、推测年龄和内部细分的化石带;其次初步设计了新的埃迪卡拉系、统、阶年代地层格架(地层柱),提议待定的上、下统及其余各阶名称,指明今后重点工作、细致研究的层型剖面和对比区域。

关键词：埃迪卡拉(震旦)系年代地层划分层型剖面江川阶瓮会阶

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Morphological reconstruction of the Ediacaran macroalga Gesinella from South China

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Journal of Palaeogeography 2023年第1期12卷 82-95页

作者： Yu-Lan Li Feng Tang Ye wang Ji Li Ming-Sheng zhao Jun-Ling Liao {2. wang College of resources and Environmental Engineering Guizhou UniversityGuiyang 550025Guizhou ProvinceChina Guizhou Bureau of geology and mineral {2. 111 Geological BrigadeGuiyang 550081Guizhou ProvinceChina institute of geology Chinese Academy of Geological SciencesBeijing 100037China College of Paleontology Shenyang Normal UniversityShenyang 110034Liaoning ProvinceChina

Macroalga Gesinella,a carbonaceous compression,is found in the upper part of Doushantuo Formation(Ediacaran)in the Yangtze Platform of South ***,it is composed of a thallus(including an oval or oblong lamina and a short-rod-like stipe)and a holdfast(including a cone-shaped rhizome and many filamentous rhizoids).The cone-shaped rhizome connects with the stipe and the long rhizoids grew on the rhizome,meaning that the rhizome grew downwards and inserted into the sediment,while the rhizoids grew in the gaps between the sediment grains to anchor its body on the *** the lamina,branching and/or unbranching filaments are regularly distributed,so that the oval or oblong lamina can be interpreted as a sac-like body that has been *** filaments on the lamina extend from the three-dimensionally preserved stipe,suggesting that the short-rod-like stipe may have been flexible to support the sac-like body in the water *** tissue and organ differentiations,Gesinella can be regarded as a eukaryotic macroalga and a high-level *** on measurement and analysis of 108 specimens,the Ediacaran macroalga Gesinella from South China can be divided into three stages:juvenile stage(3.mm maximum width)identified with difficulty,adult stage(3.10 mm maximum width)interpreted to have grown upwards for sunlight,and senescent stage(>10 mm maximum width)that grew sideways.

关键词： Thallus Holdfast Filaments Ediacaran Gesinella South China

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上扬子海南缘晚奥陶世赫南特期沉积相特征及海平面变化

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地球学报 2018年第2期39卷 189-200页

作者：赵明胜王约沈阳师范大学古生物学院辽宁沈阳110034 中国科学院资源地层学与古地理学重点实验室中国科学院南京地质古生物研究所江苏南京210008 贵州大学资源与环境工程学院贵州贵阳550025

晚奥陶世赫南特期经历了由冈瓦纳冰川事件引起的全球海平面下降和温度降低,以及由此引发的生物集群绝灭事件,同时又是构造-沉积的转换期。因此,该时期成为奥陶—志留纪之交重大的地质事件转折期。本文通过野外露头对上扬子海南缘五峰组... 详细信息

晚奥陶世赫南特期经历了由冈瓦纳冰川事件引起的全球海平面下降和温度降低,以及由此引发的生物集群绝灭事件,同时又是构造-沉积的转换期。因此,该时期成为奥陶—志留纪之交重大的地质事件转折期。本文通过野外露头对上扬子海南缘五峰组观音桥段岩性组合、古生物以及沉积构造的研究发现,晚奥陶世赫南特期上扬子海南缘经历了滨岸潮坪相、浅滩和浅水陆棚相三种沉积相类型的改造。滨岸潮坪相主要为混积潮坪,呈环状分布于滇黔桂古陆周缘及黔中水下隆起。浅滩相可识别出生屑滩和砂屑滩两个微环境,主要分布于近潮坪相带的重庆秀山、贵州松桃以及贵州凤冈等地区。浅水陆棚可分为浅水陆棚下部和浅水陆棚上部两个区域,与潮坪相带相接触并向北过渡,其中浅水陆棚区上部又可划分为浅水混积陆棚和浅水碎屑陆棚两种类型。另外,通过岩性与生物碎屑的组合和分布特征,表明赫南特期至少经历了一次完整的海平面升降变化,并为研究全球海平面的变化提供了新的材料。

关键词：沉积特征海平面变化观音桥段上扬子海南缘赫南特期晚奥陶世

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U-Pb geochronology and geochemical characteristics of Liudaogou granodiorite in Linjiang,Jilin Province

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Global geology 2018年第4期21卷 221-231页

作者： ZHENG Yuanhao zhao Fengchen wang Li LIU Jinlong WU Qiong TIAN Lidan YIN {2. College of Earth sciences Jilin UniversityChangchun 130061China Zhejiang Geological Exploration Bureau for Non-ferrous Metals Shaoxing 312099ZhejiangChina Laizhou Municipal Bureau of Land and resources Laizhou 261400ShandongChina shenyang Center of Geological Survey CGSShenyang 110034China MLR Key Laboratory of Metallogeny and mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China

The Liudaogou area underwent multiple large-scale tectonic movements since Archean. Little studies have been carried out on the age of Mesozoic magmatism and petrogenesis in the area. Zircon U-Pb geochronology and geochemistry of the Liudaogougranodiorite were undertaken in this study to determine the forming-age of the granodiorite and to understand its petrogenesis and tectonic background of diagenesis. Zircon in the rock samples show good idiomorphic and obvious rhythmic growth girdle zone,belonging to typical magmatic *** LA-ICP-MS U-Pb dating results show that the emplacement of rock mass occurred in late Early Cretaceous( 12. ± 1 Ma,MSWD = 0. 53.. The geochemical data show that the rock belongs to quasi-aluminous granite of type I which has the properties of high potassium calc-alkaline adakite,with A/CNK ratio of 0. 82.-0. 98( 3.4. 9 × 10^(-6)--777. 6 × 10^(-6)) and low Y( 8. 84.× 10^(-6)--12. 4.× 10^(-6)). The samples are rich in Si,and the K_2.O/Na_2.O ratio( 0. 99--1. 3.) is very high,indicating that magma might have originated from melting upper crust. The high content of Mg~#( 4.. 68--56. 92. in the samples implies that mantle-derived materials might have involved in magma. It can be concluded that in the process of delamination,the lower crust sank,and was heated by asthenosphere mantle,and partially melted. The primitive magma should be the mixture of the mantle-derived magma and the partially melting lower crust. Integrating research results on the regional contemporary igneous rock,it can be concluded that the rocks were formed in an active continental margin environment related to the subduction of the Paleo-Pacific Plate to the Eurasian Plate.

关键词： Linjiang Liudaogou zircon U-Pb geochronology geochemistry

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