检索结果-南通市图书馆

On the Morphological Complexity of the Graptolite Tubaria in the Darriwilian(Middle Ordovician)

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2019年第S1期93卷 135-137页

作者： MA Xuan zhang yuandong University of Chinese Academy of Sciences19 Yuquan RoadBejingChina CAS Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and Palaeontology39 East Bejing RoadNanjingChina

1 Introduction As one of the major zooplanktonic organisms in the Ordovician and Silurian marine ecosystems,graptolites played a unique role in the GOBE(Great Ordovician Biodiversification Event)and underwent a considerable variation of diversities both in lifestyle and in speciation through the Ordovician(Sadler et al.,2011;Cooper et al.,2014).

关键词： Complexity graptolite tubaria Ordovician Darriwilian

Biostratigraphic and Chemostratigraphic Correlation for the Base of the Middle Ordovician between Yichang and Western Zhejiang Areas,South China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2011年第2期85卷 320-329页

作者： zhang yuandong Axel MUNNECKE CHEN Xu CHENG Junfeng LIU Xiao State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Nanjing 210008 China GeoZentrum Nordbayern FG Palaoumwelt University Erlangen-Nuremberg D-91054 Erlangen Germany Research Institute of Petroleum Exploration and Development East China Company SINOPEC Nanjing 210011 China

The base of the Middle Ordovician （i.e. Dapingian Stage） has been defined at the first appearance datum （FAD） of conodont Baltoniodus？ triangularis at Huanghuachang, Yichang, China,but the precise correlation of the boundary to regions of other facies remain to be resolved. Herein we review the biostratigraphy and chemostratigraphy of the Huanghuachang Global Standard Stratotype-Section and Point （GSSP） section, and present our latest stratigraphic work on the nearby Chenjiahe s ection in Yichang, and the Hengtang Quarry section, Jiangshan, Zhejiang, which is regarded as representative of slope facies. The conodont and graptolite biostratigraphy as well as chemostratigraphy of the Chenjiahe section indicate that the base of the Middle Ordovician also falls within the graptolite Azygograptus suecicus Zone, and coincides with a high or maximum δ13C value within a minor positive carbon isotope excursion, suggesting that the base boundary can be readily recognized across the entire Yangtze Gorges area. The integrated graptolite and conodont biostratigraphy and chemostratigraphy of the Hengtang section, Jiangshan, indicates that the basal boundary probably falls within the graptolite lsograptus caduceus imitatus Zone that overlies the Azygograptus suecicus Zone, and coincides with a remarkable drop of δ13C. This difference indicates that a multi-disciplinary approach is critical to identify the base boundary in those regions where the Baltoniodus ？ triangularis is absent.

关键词： Graptolite biostratigraphy chemostratigraphy Middle Ordovician slope facies South China

Geographical Distribution and Diversity History of Late Cambrian and Ordovician Gastropods in China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2019年第S1期93卷 119-122页

作者： LI Wenjie FANG Xiang zhang yuandong CAS Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and Palaeontology Chinese Academy of SciencesNanjingJiangsu 210008 University of Chinese Academy of Sciences Beijing 100049 Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment Chinese Academy of SciencesNanjingJiangsu 210008

1 Introduction Gastropods are one of the most diverse groups in the living *** rich,long-ranging and extensive occurrences of gastropod fossils make them a unique animal group for evolutionary,ecologic,and biogeograph... 详细信息

关键词： gastropods Ordovician distribution diversity China

Ordovician graptolite-bearing strata in southern Jiangxi with a special reference to the Kwangsian Orogeny

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2010年第11期53卷 1602-1610页

作者： Xu Chen yuandong zhang JunXuan Fan JunFeng Cheng QiJian Li Chinese Acad Sci Nanjing Inst Geol & Palaeontol State Key Lab Palaeobiol & Stratig Nanjing 210008 Peoples R China

The Ordovician graptolite sequence of the Yongxin-Chongyi area in southern Jiangxi was suggested as a standard for the correlation of Ordovician in the Zhujiang region of South China. Based on a restudy of the Upper Ordovician graptolites, the Shikou and Huamianlong formations are recognized herein as a part of the Hanjiang Formation, corresponding only to the Dipla-canthograptus caudatus-Diplacanthograptus spiniferus Zone. Two graptolite zones in the Longxi Formation of Yongxin and Chongyi, the Nemagraptus gracilis Zone and Climacograptus bicornis Zone, are redefined here. A rapid replacement of facies from the typical deep-water graptolitic black shale of Longxi Formation to the rapidly-accumulated, shallow-water clastic deposits of Hanjiang Formation indicates the tectonic initiation of the Kwangsian Orogeny. The thick clastic deposits of the Han-jiang Formation are proposed to come from a nearby source area that rose during the Kwangsian Orogeny. The D. caudatus-D. spiniferus graptolite Zone of the Hanjiang Formation indicates the initiation time of this tectonic event.

关键词： Longxi Formation Hanjiang Formation Sandbian Ordovician graptolite Kwangsian Orogeny

Ordovician integrative stratigraphy and timescale of China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2019年第1期62卷 61-88页

作者： yuandong zhang Renbin ZHAN Yongyi ZHEN Zhihao WANG Wenwei YUAN Xiang FANG Xuan MA Junpeng zhang CAS Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment Chinese Academy of Sciences Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences) Geological Survey of New South Wales W.B.Clarke Geoscience Centre

In this chapter, starting with a brief review of the research history and current status in the studies of the Ordovician chronostratigraphy in China, the subdivision of the Ordovician System, definition and recognition of its series and stage boundaries, and possible stratigraphic gaps are discussed in details in order to establish a multidisciplinary stratigraphic correlation through an integrated approach including lithostratigraphy, biostratigraphy, radiometric dating, chemostratigraphy and magnetostratigraphy. Being internationally accepted, the Ordovician System is now subdivided into three series and seven stages, in ascending order, Lower(Tremadocian, Floian), Middle(Dapingian, Darriwilian) and Upper series(Sandbian, Katian,Hirnantian). Three of the seven "Golden Spikes" defining the bases of the Ordovician stages, which were established in 1997–2007, are located in China. As a regionally applied chronostratigraphy, the Ordovician System was subdivided in China into Lower(Xinchangian, Yiyangian), Middle(Dapingian, Darriwilian) and Upper series(Neichiashanian, Chientangkiangian,Hirnantian). This scheme agrees largely with the standard international classification, which can actually be directly applied to China, except for some special circumstances where the Neichiashanian and Chientangkiangian stages of the Upper Ordovician are used. Based on the new studies in recent years and distinctions and differences recognized in the development of the Ordovician System in the constituent terranes of China, a new framework for correlation among the major Chinese palaeoplates or terranes, e.g. South China, North China(including Tarim and Qaidam) and Xizang(Tibet)-western Yunnan, has been established. However, it has been recognized herein that uncertainties still remain on defining the base of the Tremadocian,Dapingian and Katian, and on the correlation between different mega-facies. More specifically, for the Tremadocian, the precise correlation of its base will depe

关键词： Ordovician System Geological age Chronostratigraphy Chemostratigraphy Biostratigraphy

Biostratigraphic correlation of the Ordovician black shales in Tarim Basin and its peripheral regions

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2012年第8期55卷 1230-1237页

作者： CHEN Xu zhang yuandong LI Yue FAN JunXuan TANG Peng CHEN Qing zhang YuanYuan Nanjing Institute of Geology and Palaeontology Chinese Academy of SciencesNanjing 210008China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing 210008China Graduate University of Chinese Academy of Sciences Beijing 100049China

Ordovician black shales are widely distributed in the Tarim Basin and its peripheral regions,and some of them may serve as potential hydrocarbon source *** present study of the Ordovician graptolite fauna from these shales,together with the yielded conodonts and chitinozoans etc.,permits a refined correlation of the *** mainly on a new collecting of the graptolites and a study of the faunas in Kalpin and Kuruktag regions,and the successful identification of the new graptolite material from a few drill cores within the basin,we are able to update our knowledge of the Ordovician in the regions,and draw some conclusions:(1) The most widespread distribution of the black shales in the Tarim Basin and its peripheral regions,which correspond to the Nemagraptus gracilis Zone,may be related to a global sea-level rise during this time interval.(2) Black shales of Ordovician occur most frequently and extensively in the Kuruktag(also spelled as Quruq Tagh) region in east-ern Tianshan Mountains,spanning Tremadocian to mid-Katian(*** Zone) temporally and extending southeastwards into Manjiaer *** black shales of the *** Zone may even extend into the central Tarim Basin.(3) Three different bio-and litho-facies belts(Bachu:carbonate platform and reef belt;Kalpin-Aksu:marginal platform and upper slope belt;Wushi:slope belt) are recognized in the northwestern Tarim Basin.(4) The internationally well-correlated Saergan black shale,which has been considered to possess high potential for hydrocarbon source rock,may possess a restricted distribution in the Kalpin and Aksu areas.

关键词： Tarim Basin Ordovician black shale biostratigraphic correlation graptolite

Changes of net primary productivity in China during recent 11 years detected using an ecological model driven by MODIS data

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2013年第1期7卷 112-127页

作者： Yibo LIU Weimin JU Honglin HE Shaoqiang WANG Rui SUN yuandong zhang Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing University Nanjing 210093 China International Institute for Earth System Science Nanjing University Nanjing 210093 China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100875 China Key Laboratory of Forest Ecology and Environment State Forestry Administration Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry Beijing 100091 China

Net primary productivity （NPP） is an important component of the terrestrial carbon cycle. Accurately mapping the spatial-temporal variations of NPP in China is crucial for global carbon cycling study. In this study the process-based Boreal Ecosystem Productivity Simulator （BEPS） was employed to study the changes of NPP in China＇s ecosystems for the period from 2000 to 2010. The BEPS model was first validated using gross primary productivity （GPP） measured at typical flux sites and forest NPP measured at different regions. Then it was driven with leaf area index （LAI） inversed from the Moderate Resolution Imaging Spectroradiometer （MODIS） reflec- tance and land cover products and meteorological data interpolated from observations at753 national basic meteorological stations to simulate NPP at daily time steps and a spatial resolution of 500m from January 1, 2000 to December 31, 2010. Validations show that BEPS is able to capture the seasonal variations of tower-based GPP and the spatial variability of forest NPP in different regions of China. Estimated national total of annual NPP varied from 2.63 to 2.84Pg ***-1, averaging 2.74Pg ***-1 during the study period. Simulated terrestrial NPP shows spatial patterns decreasing from the east to the west and from the south to the north, in association with land cover types and climate. South-west China makes the largest contribution to the national total of NPP while NPP in the North-west account for only 3.97% of the national total. During the recent 11 years, the temporal changes of NPP were heterogamous. NPP increased in 63.8% of China＇s landmass, mainly in areas north of the Yangtze River and decreased in most areas of southern China, owing to the low temperature freezing in early 2008 and the severe drought in late 2009.

关键词： temporal and spatial variations NPP remotesensing MODIS data BEPS model

Replacements of Major Cephalopod Faunas in Late Cambrian and Ordovician in South China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2019年第S1期93卷 102-105页

作者： FANG Xiang LI Wenjie zhang yuandong zhang Yunbai CHEN Tingen Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment Chinese Academy of SciencesNanjingJiangsu 210008China CAS Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjingJiangsu 210008China University of Chinese Academy of Sciences Beijing 100049China

1 Introduction As one of the major groups in the Great Ordovician Biodiversification Event(GOBE),cephalopods may have played a critical role in the marine ecosystem in late Cambrian and *** the few predators in the Or... 详细信息

关键词： faunal replacement cephalopods diversity South China Great Ordovician Biodiversification Event(GOBE)

Are There Any Links between Biodiversity and Paleogeographic Differentiation in the Ordovician?

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2019年第S1期93卷 90-93页

作者： CHEN Qing zhang Linna FAN Junxuan LI Chao zhang yuandong CAS Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008JiangsuChina State Key Laboratory of Paleobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008JiangsuChina School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023JiangsuChina University of Science and Technology of China Hefei 230026AnhuiChina

Two significant biological and geological events happened during the Ordovician,i.e.,the great Ordovician biodiversification event(GOBE;Webby et al.,2004)and the end-Ordovician mass extinction(Sheehan,2001).The two events were remarkably well recorded in South China and manifested by the diversity history of major marine fossil groups(e.g.,Chen et al.,2004;Rong and Zhan,2004;Rong et al.,2007).

关键词： correlation analysis lithofacies bioevent TIN polygon Ordovician