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Acta Geologica Sinica(English Edition) 2005年第5期79卷 575-581页

作者： LIU Pengju YIN Chongyu Institute of Geology Chinese Academy of Geological Sciences Beijing 100037

Abundant phosphatized acritarchs are preserved in the late Precambrian （Ediacaran） Doushantuo Formation at Weng＇an, Guizhou Province, southwest China. Most of them are large with various spinous ornaments and multilayered outer walls. The general characters of these fossils are quite similar to those found from the homochronous deposits of the Yangtze Gorges, southern China. Therefore the Doushantuo Formation in the Weng＇an area can be correlated directly with the Doushantuo Formation of the Yangtze Gorges. Four species in four genera, including two new genera, two new species and one uncertain species are systematically described for the first time from the studied locality. The taxa are Bacatisphaera baokangensis Zhou, Brasier et Xue, 2001, Taeniosphaera doushantuoensis gen. et sp. nov., Rugospinasphaera speciosa gen. et sp. nov. and Meghystichosphaeridium sp. The new data enriches the famous Weng＇an biota, especially the marine microplankton flora in the Ediacaran Doushantuo Formation.

关键词： Weng'an area Guizhou Ediacaran Doushantuo Formation acritarchs

Fluorescence intensity studies of Triassic acritarchs from the Yanchang Formation in Ordos basin,northwestern China

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Frontiers in Biology 2007年第4期2卷 479-483页

作者： JI Liming MENG Fanwei XU Jinli Research Centre of Oil and Natural Gas Resource Institute of Geology and GeophysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Geological Sciences Research Institute of Shengli Oilfield Dongying 257000China

Fluorescence properties of Early Cambrian acri-tarchs were investigated using Leica das Mikroskop(DM)microscopy with a mercury ***-preserved autoflures-cence properties show a correlation between acritarchs morphology and the intensity of emitted *** accordance with the fluorescence intensity of organic cell walls,two groups of microfossils were *** of observation in this study,which are consistent with those of the previous foreign studies,are in good agreement with regular difference in autofluorescence intensity among paly-nomorphs reported by McPhilemy(1998).Spores and algae,including Botryococcus,have very bright fluorescence while acritarchs often show less intense *** brown microfossils have been reworked,and have little or no fluorescence.

关键词： acritarchs flurescence Yanchang Formation Triassic

Biodiversity of Early-Middle Ordovician acritarchs and sealevel changes in South China

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Science Bulletin 2005年第20期 108-114页

作者： YAN Kui1,3, LI Jun1 & LIU Jianbo2 1. Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China 2. School of Earth and Space Sciences, Peking University, Beijing 100871, China 3. Gradate University of Chinese Academy of Sciences, Beijing 100049, China

As the primary producers, acritarchs represent the base of the food chain in the Paleozoic marine ecosystem which links with the evolution of acritarchs. Based on high precision quantitative research, much information about Paleozoic marine ecosystem is provided. A quantitative analysis of Early-Middle Ordovician acritarch diversity changes in the Meitan Formation, Honghuayuan section, Tongzi, Guizhou is made and the the acritarch diversity curves are compared with sea level curves. We found that acritarch diversity changes were related to sea level changes during the Early-Middle Ordovician. Whereas sea level rose, and acritarch diversity also increased. An inshore-offshore model of acritarchs best explains the relative abundance changes of some acritarch taxa in relation to sea level changes.

关键词： acritarchs diversity sea level changes Early-Middle Ordovician South China.

Early–Middle Cambrian Palynomorph Microfossils and Related Geochemical Events in South China

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Journal of Earth Science 2016年第2期27卷 180-186页

作者： Leiming Yin Chunjiang Wang Yuanlong Zhao Zhiji Ou State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences 39 East Beijing Road Nanjing 210008 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China College of Resource and Environment of Guizhou University Guiyang 550003 China

The earliest Cambrian acritarch ＇Asteridium-Heliosphaeridium-Comasphaeridium＇ assemblage and the Early Cambrian（＇Chiungchussuan＇） acritarch ＇Skiagia ornate-Fimbriaglomerella membranacea＇ assemblage in South China can be correlated with assemblages from synchronous strata elsewhere in the world. Recent geochemical study and biomarker evidence further confirm a biostratigraphic change between Cambrian Series 2 and Series 3 and support the recognition of a major geological and biotic event during this time interval.

关键词： Early-Middle Cambrian acritarchs geochemistry South China.

Paleoproductivity and Paleoredox Condition of the Huai Hin Lat Formation in Northeastern Thailand

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Journal of Earth Science 2016年第3期27卷 350-364页

作者： Boonnarong Arsairai Akkhapun Wannakomol Qinglai Feng Chongpan Chonglakmani School of Geotechnology Institute of Engineering Suranaree University of Technology State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences School of Earth Sciences China University of Geosciences

The petroleum exploration has been conducted in the Khorat Plateau since 1962 and two gas fields have been discovered and commercially produced. The lacustrine facies of the Huai Hin Lat Formation is believed to be one of the main source rocks of the gas. Therefore, investigation and analysis of the Huai Hin Lat shale for understanding the paleoenvironment and petroleum source rock are carried out in this study. Petrographical study and geochemical analysis of shale samples were performed to explain the paleoproductivity and past redox condition. The palynofacies assemblage comprises abundant AOM, acritarchs, phytoclasts, and very small amount of spores and pollen. Geochemical analysis was used to determine the total organic carbon（TOC） and the concentration of major, trace, and rare earth elements. The paleoproductivity proxies are composed of palynofacies, TOC, excess SiO2, Ba/Al, and P/Al. They reflect a high paleoproductivity except the middle of the lower part（bed 3） and the lower bed 13 of the upper part. Bed 3 shows the highest peak of TOC and the lower bed 13 exhibits a relatively lower TOC, which can be explained by the excellent and the poorer preservation condition, respectively. The paleoredox proxies consist of U/Th, V/Cr, Ni Co,（Cu＋Mo）/Zn, Ni/V, and Ce anomaly. They are used to establish the depositional environments, to characterize the organic matter content, and to assess the source rock potential. They reflect many high peaks and predominantly high values of paleoredox proxies except the middle part and the lower bed（lower bed 13） of the upper part. They indicate that the section was mainly under anoxic or reducing condition, which is supported by the high Ce/Ce＊（〉0.8） and V/Cr（〉2.0） values. The middle of the lower part（bed 3） shows lower productivity but it contains the highest peak of TOC, which is conformed to be the excellent preservation of organic matters in the strong reducing condition. The middle part, which shows high productivity, contai

关键词： fluvio-lacustrine facies Sap Phlu Basin primary productivity TOC acritarchs organic carbon preservation reducing condition anoxic environment

Organic-walled Microfossils from the Early Middle Cambrian sediments of the Holy Cross Mountains,Poland：Possible Implications for Sedimentary Environment in the SE Margin of the Baltica

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 39-50页

作者： Marta BAK Lucyna NATKANIEC-NOWAK Beata NAGLIK Krzysztof BAK Pawel DULEMBA Faculty of Geology Geophysics and Environmental Protection AGH University of Science and Technology Mickiewieza 30 30-059 Krakow Poland Institute of Geography Pedagogical University of Cracow Podchorazych 2 30-084 Krak6w Poland

An association of organic-walled microfossils consisting of filamentous cyanobacteria, algal coenobia and acanthomorphic acritarch have been documented from non-calcareous claystones and mudstones of the Pepper Mountains Shale Formation（PMSF）, located in its stratotype area in the Pepper Mountains, which are part of the Holy Cross Mountains in Poland. These sediments represent the oldest strata of the ？ysogóry Unit, deposited on the edge of the East European Craton（Baltica）. Non-branched, ribbon-like and thread-like cyanobacteria trichomes exhibit morphological similarities to families Nostocaceae and Oscillatoriaceae. Cells assembled in rounded to irregular clusters of monospecific agglomerations represent multicellular algal coenobia, attributed to the family Scenedesmaceae. The co-occurrence of acritarchs belonging to species as Eliasum llaniscum, Cristallinium ovillense and Estiastra minima indicates that the studied material corresponds to the lower Middle Cambrian. Deposition of the PMSF took place in shallow marine environment, influenced by periodical freshwater inputs. The varying degree of coloration of organic-walled microfossils is interpreted in this study as factor indication of possible different source of their derivation. Dark brown walls of cells assembled in algal coenobia might have sustained previous humification in humid, terrestrial environments, which preceded their river transport into the sea together with nutrients, causing occasional blooms of cyanobacteria in the coastal environment and the final deposition of both groups of organisms in marine deposits.

关键词： algal coenobia filamentous cyanobacteria acritarchs Cambrian Baltica Holy Cross Mountains

New data regarding acritarch biostratigraphy from the Early-Middle Cambrian Kaili Formation in Chuandong,Guizhou Province,China

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Progress in Natural Science:Materials International 2009年第1期19卷 107-114页

作者： Leiming Yin a,Ruidong Yang b,Jin Peng c,Fanfan Kong a a Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China b College of Resource and Environment of Guizhou University,Guiyang 550003,China c Department of Sciences of Nanjing University,Nanjing 210093,China [a]Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China [b]College of Resource and Environment of Guizhou University Guiyang 550003 China [c]Department of Sciences of Nanjing University Nanjing 210093 China

Previous studies had evaluated acritarchs from the Balang and Pingzhai sections of the Early-Middle Cambrian Kaili Formation in east Guizhou,*** results of these studies suggest that the acritarchs in these sections have potential biostratigraphic *** recently,34 samples collected from 83 m lower part of the Lower-Middle Cambrian Kaili Formation in the Jianshan section of Chuandong,Guizhou Province were prepared for palynological *** of these samples revealed a distinct change in the acritarch assemblages at the bed,which was approximately 46 m above the bottom of the Kaili *** findings suggest a boundary represented by an important alteration of the ecological *** addition,the position of the acritarch biostratigraphic change is somewhat higher than the boundary between Cambrian Series 2 and Series 3 based on trilobites found in the same *** indicates that the distinct change in acritarch assemblages is similar to the change in trilobite assemblages that occurs around the boundary between Cambrian Series 2 and Series ***,acritarch biostratigraphy can provide data that can be used to define the base of Cambrian Series 3 in this region,and possibly worldwide.

关键词： acritarchs Lower-Middle Cambrian Kaili Formation Jianshan section Chuandong

The microfossils in phosphate deposit in Doushantuo stage, Sinian System, Weng' an, Guizhou Province

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Chinese Science Bulletin 2000年第3期45卷 279-284页

作者： Chongyu Yin Linzhi Gao Institute of Geology Chinese Academe of Geological Science Beijing China

The aim of this study is to discuss the microfossils in phosphate deposit in the Doushantuo stage, Sinian System, weng’an, Guizhou Province. Based on the detailed observation in morphology and microstructures, it is considered that those acritarchs with interior spicules probably belong to sponge animals. However, some explanations for a part of soft-tissue are stili contrioversial. The reliable conciusion stili needs more evidence to study. The scientific significance of this study and the key questions for further studies are suggested here.

关键词： Doushantuo stage phosphate acritarchs sponge animal.

BIOSTRATIGRAPHY OF THE EASTERN KUNLUN MLANGE AND ITS TECTONIC SIGNIFICANCE

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BIOSTRATIGRAPHY OF THE EASTERN KUNLUN MLANGE AND ITS TECTO...

PYRITISED SPHERICAL MICROFOSSILS FROM THE MIDDLE DEVONIAN TULLY FORMATION OF PENNSYLVANIA, U.S.A.

第二届国际古生物学大会

作者： Kexin ZHANG, Mansheng LUO, Qinglai FENG, Qixiang LIN, Yunhai ZHU, Guocan WANG Faculty of Earth Sciences, GPMR and BGEG Laboratories, China University of Geosciences, Wuhan 430074,China.

The studied area is situated tectonically in the east of the Eastern Kunlun Mountains at the junction of the Eastern Kunlun Orogenic Belt with the Western Qingling. The rocks of the area range from Proterozoic to Cenozoic, and Neoproterozoic to Palaeozoic melange is widespread. There are two ophiolite melange belts of different ages: the Middle Eastern Kunlun Ophiolite Melange Belt in the north, and the A’nyemaqen Ophiolite Melange Belt in the south, representing two sutures of different ages.

关键词： acritarchs Radiolarian Melange Eastern Kunlun.

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PYRITISED SPHERICAL MICROFOSSILS FROM THE MIDDLE DEVONIAN TU...