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An accurately delineated Permian-Triassic Boundary in continental successions

Science china Earth Sciences 2007年第9期50卷 1281-1292页

作者： YIN HongFu1, YANG FengQing2, YU JianXin2, PENG YuanQiao1, WANG ShangYan3 & ZHANG SuXin1 1 Laboratory of Biological and Environmental Geology, china University of Geosciences, Wuhan 430074, china 2 State Key Laboratory of geological Process and Mineral Resources, china University of Geosciences, Wuhan 430074, china 3 geological survey of guizhou province, guiyang 550011, china Laboratory of Biological and Environmental Geology China University of Geosciences Wuhan 430074 China State Key Laboratory of geological Process and Mineral Resources China University of Geosciences Wuhan 430074 China geological survey of guizhou province Guiyang 550011 China

The Permian-Triassic Boundary Stratigraphic Set (PTBST), characteristic of the GSSP section of Meishan and widespread in marine Permian-Triassic Boundary (PTB) sequences of South china, is used to trace and recognize the PTB in a continental sequence at Chahe (Beds 66f―68c). Diversified Permian plant fossils extended to the PTBST, and a few relicts survived above that level. Sporomorphs are dominated by fern spores of Permian nature below the PTBST, above which they are replaced by gymnosperm pollen of Triassic aspect. In the nearby Zhejue Section, the continental PTBST is charac- terized by the fungal 'spike' recorded in many places throughout the world. The boundary claybeds (66f and 68a,c) of the PTBST are composed of mixed illite-montmorillonite layers analogous with those at Meishan. They contain volcanogenic minerals such as β quartz and zircon. U/Pb dating of the upper claybed gives ages of 247.5 and 252.6 Ma for Beds 68a and 68c respectively, averaging 250 Ma. In con- trast to the situation in Xinjiang and South Africa, the sediment sequence of the Permian-Triassic tran- sition in the Chahe section (Beds 56―80) become finer upward. Shallowing and coarsening upward is not, therefore, characteristic of the Permian-Triassic transition everywhere. The occurrence of relicts of the Gigantopteris Flora in the Kayitou Fm. indicates that, unlike most marine biota, relicts of this pa- leophytic flora survived into the earliest Triassic. It is concluded that Bed 67 at Chahe corresponds to Bed 27 at Meishan, and that the PTB should be put within the 60-cm-thick Bed 67b④, now put at its base tentatively. This is the most accurate correlation of the PTB in continental facies with that in the marine GSSP.

关键词： Permian-Triassic Boundary, terrestrial sequence, U-Pb age, Chahe section, accuracy

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A new species of Macrocnemus (Reptilia: Protorosauria) from the Middle Triassic of southwestern china and its palaeogeographical implication

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Science china Earth Sciences 2007年第11期50卷 1601-1605页

作者： LI Chun1, ZHAO LiJun2 & WANG LiTing3 1 Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, china 2 Zhejiang Museum of Nature History, Hangzhou 310012, china 3 geological survey of guizhou province, guiyang 550005, china Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing China Zhejiang Museum of Nature History Hangzhou China geological survey of guizhou province Guiyang China

A new species of the terrestrial protorosaur Macrocnemus is briefly described and named Macrocne-mus fuyuanensis sp. nov. The specimen was found from the marine Triassic of Yunnan province, southwestern china. It differs from the type species M. bassanii in having the following characters: (1) 17 or 18 dorsal vertebrae; (2) relatively long humerus; and (3) femur longer than tibia. M. fuyuanensis is the only record of the genus outside Monte San Giorgio area and the first definite terrestrial reptile found from the marine Triassic of china. The age of the fossil-bearing Zhuganpo Member of the Falang Formation is believed to be the Ladinian based on associated vertebrate fauna. The existence of Mac-rocnemus in the limestone suggests the presence of a terrestrial ecosystem which probably originated from the Anisian and well developed in the Ladinian in this region. The island system along the north-coast of Tethyan during the Triassic was probably an important route for the exchanges of reptiles, especially the terrestrial reptiles between the west and east.

关键词： Protorosauria,Middle Triassic,Ladinian,Yunnan,terrestrial reptile

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Vermicular fossils in the Early Cambrian Xidashan Formation in the Quruqtagh region of Xinjiang, china

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Progress in Natural Science:Materials International 2006年第5期16卷 559-562页

作者： YANG Ruidong, ZHANG Chuanlin, SONG Guoqi and LUO Xinrong (Postgraduate School of guizhou University, guiyang 550025, china Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, china geological survey of No. 3 geological Party, Xinjiang, Kurle 841000, china) Postgraduate School of guizhou University Guiyang 550025 China Nanjing Institute of Geology and Mineral Resources Nanjing 210016 China geological survey of No. 3 geological Party Xinjiang Kurle 841000 China

Large amounts of vermicular fossils and a minor amount of sponge animal fossils have been found in the Early Cambrian Xidashan Formation in the region of Quruqtagh, Xinjiang. Vermicular fossils are generally more than 50 mm long and 0. 3-1. 4 mm wide; their wrinkled lamellae are microfine with 3-10 pieces within the length of every each millimeter. The fossils are considered to be Sabellidites cambriensis Sokolov (1965) . The Xidashan Formation is the highest stratum in which Sabellidites occur, as has been so far reported.

关键词： vermicular fossil Early Cambrian Quruqtagh Xinjiang.

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New Advances in the Study of the Devonian-Carboniferous Boundary Stratotype in Muhua,Changshun,guizhou——An Introduction to the Daposhang Devonian-Carboniferous Boundary Section

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Acta Geologica Sinica(English Edition) 1988年第4期1卷 349-363+464-466页

作者： Ji Qiang Wei Jiayong Wang Hongdi Wang Ning Luo Xiaosong Chinese Academy of geological Sciences, Beijing guizhou Regional geological survey Party, guiyang, guizhou Chinese Academy of geological Sciences Beijing China

The Daposhang section at Muhua, Changshun. guizhou. is an excellent and attractive DevonianCarboniferous boundary section. The transitional beds between the Devonian and Carboniferous of the sectionare continuous and well exposed. belonging to the deep-water basin facies Abundant fossil groups have beendiscovered from this section: conodonts. ammonoids. trilobites. ostracods. vertebrate microfossils and so *** far as known. it has the most continuous and complete conodont zonation for the Devonian-Carboniferousboundary beds in the world. It is especially worth pointing out that both typical Siponodella pracsulcata andthe transitional forms between S. praesulcata and S. sulcata have been found from the upper pracsulcata Zoneof the Daposhang section. Evidently. we can not only prove the actual existence of the evolutionary lineagefrom S. praesulcata to S. sulcata, but also exactly define the level of the Devonian-Carboniferous boundary. Inthis paper. the development of the Devonian-Carboniferous boundary beds at the Daposhang section is dealtwith and the section is compared with the Muhua section and the Nanbiancun section which are the candidatesfor the Devonian-Carboniferous boundary stratotype. In the authous opinion the Daposhang section is obvi-ously better than the Muhua and the Nanbiancun sections. hence it can be recommended as one of the candi-dates for the international Devonian-Carboniferous boundary stratotype.

关键词： In oral New Advances in the Study of the Devonian-Carboniferous Boundary Stratotype in Muhua,Changshun,guizhou

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Guanling Biota: A Rare Biota in Sea Early Late Triassic

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Journal of china University of Geosciences 2002年第3期13卷 215-216页

作者： Wang Shangyan The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, guiyang 550002 guizhou geological survey, guiyang, 550004 Wang Yangeng Wang Liting Yin Gongzheng guizhou geological survey, guiyang 550004 The State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 guizhou geological survey Guiyang550004 guizhou geological survey Guiyang550004

Guanling biota has been found at the bottom of Wayao Formation of UpperTriassic (Carn-ic stage) near Xinpu town, Guanling County, guizhou province, china. There are a lotof crinoids and marine reptiles, which is a characteristic of Guanling biota, including ammonites,bivalve, brachiopod, fish, conodont and plant. These fossils are featured not only with the largequantity, but also with their extraordinary perfect forms. This paper explores the meaning,geological background, present situation of study and scientific significance of Guanling biota.

关键词： guanling biota triassic guizhou

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Triassic Transgressive-Regressive Sequences in guizhou-Guangxi Region, South china

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Journal of Earth Science 1996年第1期15卷 112-121页

作者： Wei Jiayong (Regional geological survey, Xi’an College of Geology, Xi ’an 710054) Liao Nengmao Yu Youyi (Regional geological surveying Institute of guizhou, guiyang 550005)

Seven third-order transgressive-regressive sequences are recognized in the Early Triassic -Early Carnian stratigraghc succession of guizhou-Guangxi region, South china. Based on currently available ages by the correlation of conodont ammonites and bivalve faunas, these sequences range approximately from 1.0 Ma to 5.6 Ma, with the average of 3 Ma. They occur largely in the Griesbachian-Dienerian, Smithian,uppermost Smithian-lowermost Anisian, Lower Anisian, Middle Anisian, Upper Anisian-Upper Ladinian and the uppermost Ladinian-Lower Carnian respectively, and can be grouped into three second-order transgressive-regressive supersequences. A relative sea level curve is established from the sequence stratigraghic analysis. Transgressive-regressive sequences,bounded by transgressive surfaces and the correlatable unconformities, are real unconformity-bounded units of lower rank. Each sequence comprises transgressive, highstand and regressive systems tracts, and can be easily correlated with the depositional sequence.

关键词： Triassic transgressive-regressive sequence relative sea level change guizhou Guangxi.

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1∶25万丁固幅、加措幅地质调查成果与进展

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沉积与特提斯地质 2005年第1期25卷 45-50页

作者： guizhou Institute of geological survey(guizhou Institute of geological survey, guiyang 550003, guizhou, china) 贵州省地质调查院贵州贵阳550003

地层方面,在冈玛错下石炭统日湾擦卡组上部灰岩中采获晚二叠世古生物化石组合;在查波错东岸中二叠统鲁谷组上部灰岩中采获中三叠世化石;在磨盘山一带侏罗系雁石坪组灰岩中采获、珊瑚化石,大部分应划分为二叠系;在他利克甘利山上三叠... 详细信息

地层方面,在冈玛错下石炭统日湾擦卡组上部灰岩中采获晚二叠世古生物化石组合;在查波错东岸中二叠统鲁谷组上部灰岩中采获中三叠世化石;在磨盘山一带侏罗系雁石坪组灰岩中采获、珊瑚化石,大部分应划分为二叠系;在他利克甘利山上三叠统肖茶卡组中采获早三叠世牙形刺,将其修订为下三叠统硬水泉组;在测区东北角新发现一套角度不整合于上三叠统肖茶卡组砂屑灰岩之上的火山岩;友谊沟南西侧前人所划石炭系木实热不卡群与前泥盆系之间的角度不整合接触关系不存在,二者实为同一套地层;在尖山至走构由茶错一带新发现一套中酸性火山岩及一套玄武岩;在峡峡定沟、麦尔则一带新发现一套安山岩;在则下龙一带新发现一套冲积成因的更新统砾岩;初步确定区内第四纪更新世有古大湖存在。岩石方面,原所划的昆楚克错岩体、加作巴热岩体、先遣岩体实为一个巨大岩基;在达尔应一带新发现一套富含云母的典型S型花岗岩;在冈玛日北西岗玛错断裂以北新发现一处花岗片麻岩;在达尔应一带新发现呈断夹块产出的石榴角闪中长片麻岩;在冈玛日一带发现呈岩片状产出的蓝片岩。构造方面,查明冈玛错断裂为一构造混杂岩带,区内存在上、中、下构造层次的变形。新发现一批铜、铁、金、石膏、玉石等矿点。

关键词： 1:25万地质调查丁固幅、加措幅成果与进展西藏

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A restudy of Oryctocephalus indicus (Reed,1910)

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Progress in Natural Science:Materials International 2006年第11期16卷 1177-1182页

作者： ZHAO Yuanlong~1**, YUAN Jinliang~2, PENG Shanchi~ 2,3 , YANG Xinglian~1, PENG Jin~1, LIN Jihpai~4, and GUO Qingjun~5(1. College of Resource and Environment of guizhou University, guiyang 550003, china 2. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, china 3. State Key Laboratory of Papaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Nanjing 210008, china 4. Department of geological Science, Ohio State University, Columbus, OH 43210, USA 5. Institute of Geochemistry, Chinese Academy of Sciences, guiyang 550002, china) College of Resource and Environment of guizhou University Guiyang 550003 China Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China State Key Laboratory of Papaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Nanjing 210008 China Department of geological Science Ohio State University Columbus OH 43210 United States Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

Restudy on morphology of Oryctocephalus indicus (Reed, 1910), based on specimens from guizhou, china and Nevada USA, suggests that the subspecies regarded previously as Oryctocephalus indicus indicus (Reed, 1910), O. indicus latus Zhao et Yuan 2002, and O. indicus kobayashi Saito, 1934, are synonymous, and Oryctocephalus americanus Sundberg et McCollum, 2003 is a similar form of O. indicus. Oryctocephalus indicus is rediagnosed as having a glabella that is subconical in outline and tapering forward slightly; a thorax that comprises 12 segments, and a small pygidium that bears 2—3 axial rings with a terminal piece and a postaxial ridge. Oryctocephalus indicus is widely distributed in eastern guizhou and ranges through a great interval of Kaili Formation. Its first appearance is almost identical with these events of trilobite extinction-recovery occurring at the end of the Early Cambrian, the alternation of acritach assemblages, the change of trace elements (REE) and stable isotopes (carbon) at the Wuliu-Zengjiaya section. As one of the key forms for defining the traditional Lower-Middle Cambrian boundary (the base of Cambrian Series 3 and Stage 5 in the new Cambrian chronstratigraphic standard), O. indicus has received detailed study and has more advantages than other species such as Ovatoryctocara granulata Tchernysheva, 1962 or Arthricocephalus chauveaui Bergeron, 1899.

关键词： Oryctocephalus indicus restudy Kaili Formation Cambrian guizhou china.

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Discovery of hydrothermal venting community at the base of Cambrian barite in guizhou province,Western china: Implication for the Cambrian biological explosion

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Progress in Natural Science:Materials International 2008年第1期18卷 65-70页

作者： Ruidong Yang*,Huairui Wei,Miao Bao,Wei Wang,Qiang Wang, Xiaodong Zhang,Ling Liu Graduate School of guizhou University,guiyang 550025,china Graduate School of guizhou University Guiyang 550025 China

The barite deposit in the Niutitang Formation of Lower Cambrian,in Tianzhu County,guizhou province,western china,is a super- large barite deposit with about 2·109tons of ***,petrological and geochemical studies reveal that this barite deposit belongs to a hydrothermal sedimentary *** observations indicate that a lot of algae,sponge spicules and tube-type fos- sils are well-preserved in this barite section,and moreover,those fossils share most characteristics of the deep-sea hydrothermal venting community in the modern *** suggest that the hydrothermal venting community was thriving in hydrothermal vent in early Cam- brian,and it is of great significance for elucidating the geological background of the‘‘Cambrian explosion’’.china *** rights reserved.

关键词： Hydrothermal community Barite Cambrian guizhou

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1∶25万毕节县幅、遵义市幅地质调查成果与进展

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沉积与特提斯地质 2005年第1期25卷 141-144页

作者： guizhou Institute of geological survey(guizhou Institute of geological survey, guiyang 550005, guizhou, china) 贵州省地质调查院贵州贵阳 550005

在毕节青场桐梓组顶部至石炭系中发现有大量的暴露构造现象;发现毕节地区中二叠世茅口期存在两条走向北北东、宽1 0～5 0km的“黑区带”;在威信县城第四系中发现大量象牙、牙齿及骨骼化石;在凤冈琊川、遵义茅坡及威信鱼井等新发现多个... 详细信息

在毕节青场桐梓组顶部至石炭系中发现有大量的暴露构造现象;发现毕节地区中二叠世茅口期存在两条走向北北东、宽1 0～5 0km的“黑区带”;在威信县城第四系中发现大量象牙、牙齿及骨骼化石;在凤冈琊川、遵义茅坡及威信鱼井等新发现多个志留纪植物化石;对黔中隆起进行了研究。

关键词： 1:25万地质调查比昌县幅、遵义市幅成果与进展贵州

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