Junxuan Fan

Junxuan Fan
Nanjing University | NJU · Department of Earth Science

PhD

About

73
Publications
24,348
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3,496
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Introduction
Skills and Expertise
Additional affiliations
November 2018 - present
Nanjing University
Position
  • Professor (Full)

Publications

Publications (73)
Article
The early Paleozoic sediments document two major biological events: the Great Ordovician Biodiversification Event (GOBE) and Late Ordovician mass extinction (LOME). Many investigations have focused on taxonomic richness patterns during these major diversification and extinction events, providing insights into their timings and potential causes. How...
Article
The age of the Silurian Lower Red Beds in the Upper Yangtze region remains debatable. Twenty-four samples were collected for conodont biostratigraphical studies from the Paiyunan Formation in the Sanbaiti Section, Huaying, Sichuan Province. The conodont fauna from the Paiyunan Formation, together with the graptolites from the underlying Lungmachi F...
Article
The Guadalupian Epoch is marked by the formation of the Pangean supercontinent, global sea-level change, rifting and drifting of the Cimmerian continents, formation of large igneous provinces and dramatic biotic changes. A high-resolution biostratigraphic, chemostratigraphic and high-precision geochronologic framework of this critical transition is...
Article
Core samples from the Huaying well, Sichuan Province, have been analyzed for both graptolite biostratigraphy and carbon isotope chemostratigraphy. The result shows a stratigraphic sequence of Lituigraptus convolutus, Stimulograptus sedgwickii and Spirograptus guerichi biozones, and records a strong positive shift of δ¹³Corg at the base of the Stimu...
Article
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Silurian is a period with the shortest duration in Phanerozoic except for the Neogene and Quaternary. It represents an important and unique interval when the biotic diversity recovered quickly after the end-Ordovician mass extinction, different paleoplates or terranes conjoined, big oceans disappeared or narrowed, climate and sea level changed freq...
Article
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Wide distribution of the black shales and diversification of the graptolite fauna in South China during the Late Ordovician resulted from its unique paleogeographic pattern, which was significantly affected by the paleogeographic evolution of the Lower Yangtze region. In the study, 120 Upper Ordovician sections from the Lower Yangtze region were co...
Article
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The Ordovician and Silurian of the Baoshan and Mangshi regions in western Yunnan Province, SW China, have long been regarded as being continuous and representative of the Sibumasu terrane. However, our recent biostratigraphical investigations of three Katian to Llandovery sections of predominantly clastic facies reveal a significant, largely correl...
Article
The Llandovery conodont provincialism is reassessed based on a larger dataset than that which was available in 1990. The study interval is divided into two time units, the ‘Pre-Telychian’ and Telychian. Three quantitative methods are adopted in the biogeographic analysis, including cluster analysis, non-metric multidimensional scaling, and minimum...
Article
The Lungmachi Formation is widely distributed in Guizhou, Chongqing and the adjacent area. It is important for the study of Silurian biostratigraphy and shale-gas investigation. Based on those biostratigraphically well-studied sections from Guiyang to Huayingshan, we reveal the stage-progressive distribution pattern of the Lungmachi black shales. T...
Chapter
Graptolite faunas from Upper Darriwilian to Lower Katian strata in Northwest China are described in this study. In ascending order, these faunas can be assigned to the following graptolite biozones: Cryptograptus gracilicornis Bed, Pterograptus elegans, Didymograptus murchisoni, Jiangxigraptus vagus, Nemagraptus gracilis, Climacograptus bicornis, D...
Chapter
A graphic correlation of the upper Darriwilian to Lower Katian graptolites from Northwest China is conducted to produce a composite sequence, which is used to precisely estimate Darriwilian to Lower Katian graptolite biodiversity. In total, 122 species or subspecies from seven sections, which include the Dawangou (Kalpin, Xinjiang, taken as the ref...
Book
Darriwilian to Sandbian (Ordovician) Graptolites from Northwest China analyzes the significance of these exquisite, mostly pyritic, graptolites of the middle to late Ordovician period from North China and Tarim, China-locations that have developed the world's most complete successions of strata and fossil records. The book provides the first system...
Article
The Yangtze Sea of the South China Craton experienced strong environmental perturbations during the first ~ 5–6 Myr of the Silurian. The Lower Silurian Lungmachi Formation in the Jiaoye-1 drillcore (Chongqing, China) records three sea-level cycles (stratigraphic sequences) characterized by rapid deepening at the base of each cycle followed by slow...
Article
The Ordovician-Silurian (O-S) transition coincided with significant environmental and biological changes. In South China, the Yangtze Platform experienced both global and regional events at this time, including sea-level fluctuations, tectonic movements, volcanic eruptions, mass extinction, and widespread anoxia. The O-S transitional strata of the...
Article
Horizon annealing (HA) provides a method to order all horizons in a chronostratigraphic data set, including marker beds and isotopic excursions, as well as horizons that lack exact local markers (such as taxon first appearances) and are, thus, constrained only by local stratigraphical order. Global stratotype section and point (GSSP) levels placed...
Article
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Previous studies suggest that the end-Permian mass extinction caused a dramatic drop of marine biodiversity near the Permian–Triassic boundary. However, it is unclear how profoundly this severe extinction might have changed the global provincialism, and how global provincialism responded to the protracted process of this extinction and subsequent r...
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Conodonts are one of the most stratigraphically important fossil groups in the Silurian Period. In this paper we examine the regional diversity dynamics of the Llandovery condonts on the Upper Yangtze Platform. The data set of 41 species from seven sections is compiled from the Geobiodiversity Database. Four measures of taxonomic richness based on...
Article
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Reconstruction of the Hirnantian (Late Ordovician) palaeotopography in South China is important for understanding the distribution pattern of the Hirnantian marine depositional environment. In this study, we reconstructed the Hirnantian palaeotopography in the Upper Yangtze region based on the rankings of the palaeo-water depths, which were inferre...
Article
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The Wufeng Formation black shales (upper Katian to lower Hirnantian) are widely distributed on the Yangtze Platform in South China. Data from 389 sections that span the stratigraphic interval of the Wufeng Formation were captured through the GBDB online database. By using the GBDB online analytical functions and the ArcGIS software, we have visuali...
Article
The Geobiodiversity Database (GBDB) Project is dedicated to the construction and maintenance of a web-enabled taxonomic, stratigraphic and geographic database for information gathered from the fossil record. Its goal is to facilitate regional and global scientific collaborations focused on studying the history, diversity, geography and environmenta...
Article
The study of graptolite paleobiogeography is important for understanding the relationship between geography and evolutionary dynamics in graptolites. However, there have been few detailed studies of graptolite paleobiogeography during the Late Ordovician, or the role that geography played in the Hirnantian Mass Extinction (HME). In this study, in o...
Article
The Kwangsian Orogeny originated along the southeast coast of China and stepwise developed in a northwest direction. It includes two stages, a long locally varying uplift from the Late Ordovician to the early Silurian and a finally tectonic movement near the Silurian and Devonian transition. The Kwangsian uplift event shows a stepwise delay northwe...
Chapter
Full-text available
Graptolite faunas exhibited strong biogeographical differentiation during the Early Palaeozoic, particularly in the Ordovician. Skevington recognized two major faunal provinces, the high to mid palaeolatitude ‘Atlantic Province’ and the low-palaeolatitude ‘Pacific Province’. Subsequent workers have generally accepted this pattern of graptolite dist...
Article
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The International Commission on Stratigraphy (ICS) has a long tradition of producing international charts that communicate higher-order divisions of geological time and actual knowledge on the absolute numerical ages of their boundaries. The primary objective of ICS is to define precisely a global standard set of timecorrelative units (Systems, Ser...
Article
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The Geobiodiversity Database (GBDB - www.geobiodiversity.com), an integrated system for the management and analysis of stratigraphic and paleontological information, was started in 2006 and became available online in 2007. Its goal is to facilitate regional and global scientific collaborations focused on regional and global correlation, quantitativ...
Article
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Palaeobiogeography of four consecutive Early Permian (Cisuralian) stages is quantitatively analyzed based on a global database of brachiopods consisting of 9131 occurrences, 3003 species of 515 genera of brachiopods from 2757 localities all over the world. Our analyses reveal three distinct largely palaeolatitude-related palaeobiogeographical realm...
Article
A mid Telychian (Llandovery, Silurian) graptolite fauna is described from the Manbo Formation at Keman, Mojiang County, central Yunnan Province, SW China, a region widely regarded as belonging to the Indochina Block in the early Palaeozoic. The fauna includes abundant Oktavites kemanensis sp. nov., O. aff. spiralis (Geinitz), Retiolites geinitzianu...
Article
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The onset timing of the Kwangsian Orogeny might differ among localities across South China. Refined stratigraphic works at different localities are necessary to reveal the details of this likely distinction. Recently, we recollected some graptolite specimens from the Ordovician Shixing and Longtouzhai formations (corresponding to the Longxi Formati...
Article
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Ordovician black shales are widely distributed in the Tarim Basin and its peripheral regions, and some of them may serve as potential hydrocarbon source rocks. The present study of the Ordovician graptolite fauna from these shales, together with the yielded conodonts and chitinozoans etc., permits a refined correlation of the rocks. Based mainly on...
Article
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Normalograptids constitute a distinctive but not easily identified group of derived axonophorans. A new study of Normalograptus morphology indicates that many Late Ordovician taxa previously identified as Normalograptus are actually referable to Styracograptus and related climacograptoids. These re-identifications have led to the recognition of a c...
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Cladistic analysis of some Hirnantian (latest Ordovician) and Rhuddanian-Aeronian (early Silurian) biserial graptolites and basal monograptids has been undertaken in order to test hypotheses of the relationships among the Neograptina ('normalograptids' and their descendents) and to provide a phylogenetic framework for understanding the early Siluri...
Article
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Based on the new material of seven Ordovician-Silurian boundary sections investigated recently, together with previously published data, we analyze the temporal and spatial distributions of the Lungmachi black shales, a key petroleum source bed widely distributed in South China. The Lungmachi black shales range in age from the Normalograptus perscu...
Article
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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...
Chapter
The tectonics and paleogeography of Ordovician rocks in China record the four major paleoplates-the South China, North China, Tarim, and Xizang (Tibet) Blocks. New paleogeographic maps of South China for the Tremadocian, Darriwilian, Sandbian-early Katian, and late Katian-Hirnatian time intervals display lithofacies and biofacies belts that depict...
Article
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The Ordovician radiation is among the major bioevents in earth history that have drawn great attention from geologists all over the world, and there have been hundreds of publications treating various aspects of this radiation. The study of the event involves a broad spectrum of research fields and concerns many scientific questions. Many opinions...
Article
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West Yunnan in southwestern China formed an important part of the Sibumasu Terrane during the Ordovician. The Ordovician rocks of the region are exposed at many localities but have been strongly affected by several phases of tectonic activity, especially by the most recent Himalayan phase that commenced in the Paleogene. For these reasons, together...
Article
Extensive work during the last decade has led to the recent decision by the International Subcommission on Ordovician Stratigraphy that the base of the Middle Ordovician Series should be placed at the base of the Baltoniodus triangularis Conodont Biozone in the Huanghuachang GSSP (Global Stratotype Section and Point) section near Yichang, Hubei Pro...
Article
The organic carbon isotope data through the unweathered Ordovician–Silurian boundary strata at the Wangjiawan Riverside section, which is c. 180 m southeast of the Wangjiawan North section, the GSSP for the base of the Hirnantian Stage (Upper Ordovician), show that a positive δ13Corg excursion begins just below the base of the Hirnantian Stage and...
Article
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A rich mid-Ordovician graptolite fauna is reported from the Shihtien Formation at Baoshan and Shidian in West Yunnan Province, SW China. The fauna comprises Didymograptus artus , D. murchisoni , D. spinulosus, Pterograptus sp., Hustedograptus vikarbyensis , H. teretiusculus , Archiclimacograptus angulatus , A. riddellensis , Haddingograptus oliveri...
Article
Analyses of global biodiversity curves have been important for the interpretation of co-evolution between organisms and environments through geological time. Global curves can be better understood if all the data collected from a multitude of palaeocontinents are analysed and explained separately. South China is a major block possessing more advant...
Article
The present work is mainly based on five continuous Ashgillian to earliest Llandovery sections together with data from more than 30 other published sections from South China. Rarefaction analysis indicates a sudden drop in diversity from the upper part of the Paraorthograptus pacificus zone to the Akidograptus ascensus zone. We combined the species...
Article
Based on the global graptolite genera and higher rank taxa, we propose three radiation stages through the Ordovician. The isograptid type of development is present within anisograptids predominating in the Tremadocian. Thus, the evolutionary radiation of the Anisograptid fauna from Tremadocian is proposed as the beginning of the Ordovician graptoli...
Article
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The Global boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the uppermost of the Ordovician System) is defined at a point 0.39m below the base of the Kuanyinchiao Bed in the Wangjiawan North section. The section is located near Wangjiawan village, 42 km north of Yichang city (western Hubei, China), at 30° 58′56″N a...
Article
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We have studied the pattern of graptolite species turnover during the latest Ordovician mass extinction based on four continuous Ashgillian to earliest Llandovery sections together with data from more than 30 other published sections. The studied sections represent relatively shallow-water and deeper-water belts in the Yangtze Platform region. Usin...
Article
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The Upper Yangtze region yields a Hirnantian (latest Ordovician) graptolite fauna that includes 41 species assigned to 13 genera. This fauna is particularly important for understanding the Late Ordovician mass extinction event because it is the most diverse known from this interval. In addition, it records the survival, well into the Hirnantian, of...
Article
Ashgillian graptolites have been described and recorded globally from 15 different paleoplates. The most diverse graptolite faunas are from the Yangtze region, South China, including 28 genera and 96 species. Among them, 25 genera and 73 species belong to the DDO fauna (Dicranograptidae – Diplograptidae – Orthograptidae fauna), and only three gener...
Article
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The Central Guizhou and Yichang Uplifts are present in central Guizhou to western Hubei. Biostratigraphic evidences from more than 20 sections in 14 counties of this region provide the data about the duration of these uplifts. Although this duration differs from locality to locality, it is mainly from Ashgillian to Rhuddanian. The uplifts result fr...
Article
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Late Ordovician to earliest Silurian is an important geological period marked by large geological and biological events. However, the strata and fossils of this interval are not complete in many parts of the world. Based on studies of 43 sites in South China, in particular the continuous sections on the Yangtze platform, we recognize a complete suc...