检索结果-南通市图书馆

New Discovery of Radiolarians in the Pomulong Mélange, Middle part of the Yarlung Zangbo Suture Zone, Tibet

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4期93卷 1139-1141页

作者： SUN Qian JI Zhansheng WU Guichun WAN Xiaoqiao School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Chinese Academy of Geological Sciences Beijing 100037China Institute of Geology CAGSBeijing 100037China

Objective The Pomulong mélange was established in the regional geological survey of Lhaze County at the scale of 1:250000 by the Geological Survey Institute of Hubei Province.

关键词： Middle Radiolarians lange

Planktic Foraminiferal Biostratigraphy of the Cretaceous Oceanic Red Beds in Kangmar,Southern Tibet,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6期85卷 1238-1253页

作者： LI Guobiao WAN Xiaoqiao PAN Mao China University ofGeosciences Beijing 100871 China Peking University Beijing 100871 China

The planktic foraminifera of the Chuangde Formation （Upper Cretaceous Oceanic Red Beds, CORBs） as exposed at Tianbadong section, Kangmar, southern Tibet has been firstly studied for a detailed for a detailed biostratigraphy elaboration. A rich and well-preserved planktic foraminifera were recovered from the Chuangde Formation of the Tianbadong section and the Globotruncanita elevata, Globotruncana ventricosa, Radotruncana calcarata, Globotruncanella havanensis, Globotruncana aegyptiaca, Gansserina gansseri and Abathomphalus mayaroensis zones have been recognized. The planktic foraminiferal assemblage points to an early Campanian to Maastrichitian age for the CORBs of the eastern North Tethyan Himalayan sub-belt, which also provides a better understanding of the shifting progress of the Indian Plate to the north and the evolution of the Neotethyan ocean. The lithostratigraphy of the Chuangde Formation of the Tianbadong section comprises two lithological sequences observed in ascending succession： a lower unit （the Shale Member） mainly composed of purple （cherry-red, violet-red） shales with interbedded siltstones and siliceous rocks; and an upper unit （the Limestone Member） of variegated limestones. The strata of the Chuangde Formation in the Tianbadong section are similar to CORBs in other parts of the northern Tethyan Himalaya area of Asia （Gyangze, Sa＇gya, Sangdanlin, northern Zanskar, etc.）. The fossil contents of the Chuangde Formation in the sections （CORBs） studied provide a means of correlation with the zonation schemes for those of the northern Tethyan Himalayan sub-belt and the Upper Cretaceous of the southern Tethyan Himalayan sub-belt. Paleogeographic reconstruction for the Late Cretaceous indicates that the Upper Cretaceous Chuangde Formation （CORBs） and correlatable strata in northern Zanskar were representative of slope to basinal deposits, which were situated in the northern Tethyan Belt. Correlatable Cretaceous strata in Spiti and Gamba situated in the southern Tethyan Belt in contrast were deposit

关键词： Planktic Foraminifera Chuangde Formation Cretaceous Oceanic Red Beds （CORBs） Tethyan Himalaya Tianbadong southern Tibet

Charophytes from the Upper Cretaceous to probably Paleocene Jiaozhou Formation in the Jiaolai Basin (Eastern China)

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2018年第4期92卷 1647-1648页

作者： LI Shal ZHANG Haichun wanG Qifei WAN Xiaoqiao Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China Center for Excellence in Life andPaleoenvironment Chinese Academy of Sciences Nanjing 210008 China State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Beijing 100083 China

Objective The Cretaceous-Paleogene boundary （K-Pg boundary） marks the beginning of the Cenozoic, and is one of the most important geological boundaries. Charophytes are usually very abundant in the non-marine strata near the KPg boundary, and the change in the charophyte flora can help to recognize the K-Pg boundary. The position of KPg boundary in the Jiaolai Basin, eastem Shandong Province, China is still in dispute. The LK-1 borehole project, which was carried out by the Institute of Geology, Chinese Academy of Geological Sciences, produced a high-quality core in northern Jiaozhou, Shandong. In this core, lots of charophyte gyrogonites have been found from the Jiaozhou Formation for the first time. It is significant to study these charophytes, which further helps to find the K-Pg boundary in the Jiaolai Basin.

关键词： Charophytes from the Upper Cretaceous to probably Paleocene Jiaozhou Formation in the Jiaolai Basin LK Eastern China

Cretaceous 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 256-286页

作者： Dangpeng XI xiaoqiao wan Guobiao LI Gang LI State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences

Cretaceous strata are widely distributed across China and record a variety of depositional settings. The sedimentary facies consist primarily of terrestrial, marine and interbedded marine-terrestrial deposits, of which marine and interbedded facies are relatively limited. Based a thorough review of the subdivisions and correlations of Cretaceous strata in China, we provide an up-to-date integrated chronostratigraphy and geochronologic framework of the Cretaceous system and its deposits in China.Cretaceous marine and interbedded marine-terrestrial sediments occur in southern Tibet, Karakorum, the western Tarim Basin,eastern Heilongjiang and Taiwan. Among these, the Himalayan area has the most complete marine deposits, the foraminiferal and ammonite biozonation of which can be correlated directly to the international standard biozones. Terrestrial deposits in central and western China consist predominantly of red, lacustrine-fluvial, clastic deposits, whereas eastern China, a volcanically active zone, contains clastic rocks in association with intermediate to acidic igneous rocks and features the most complete stratigraphic successions in northern Hebei, western Liaoning and the Songliao Basin. Here, we synthesise multiple stratigraphic concepts and charts from southern Tibet, northern Hebei to western Liaoning and the Songliao Basin to produce a comprehensive chronostratigraphic chart. Marine and terrestrial deposits are integrated, and this aids in the establishment of a comprehensive Cretaceous chronostratigraphy and temporal framework of China. Further research into the Cretaceous of China will likely focus on terrestrial deposits and mutual authentication techniques(e.g., biostratigraphy, chronostratigraphy, magnetostratigraphy and cyclostratigraphy). This study provides a more reliable temporal framework both for studying Cretaceous geological events and exploring mineral resources in China.

关键词： Cretaceous Stage/age Biostratigraphy Chronostratigraphy Magnetostratigraphy Cyclostratigraphy Stratigraphic correlation China

The Cretaceous System in China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2007年第6期81卷 957-983页

作者： WAN Xiaoqiao CHEN Peiji WEI Mingjian Capital Normal University 105 Xishanhuan Beilu Bering 100037 China University of Geosciences 29 Xueyuan Road Beijing 100083 Nanjing Institute of Geology and Palaeontology Chinese Aca-demy of Sciences Nanjing Jiangsu 210008

This paper provides an outline of Cretaceous stratigraphy and paleogeography in China, which is based on rich data obtained from recent researches. Cretaceous deposits are widespread in China. Most strata are of nonmarine origin and marine sediments occur only in Tibet, western Tarim Basin of Xinjiang, Taiwan and limited localities of eastern Heilongjiang. AH deposits are rich in fossils and well-constrained biostratigraphically. The stratigraphic successions of different regions are illustrated, and general stratigraphic division and correlation have been introduced. The marine deposits are described in the Tibetan Tethys, Kashi-Hotan Region of Xinjiang, eastern Heilongjiang, western Yunnan and Taiwan; the nonmarine deposits are outlined from northeast China, southeast China, southern interior China, southwest China, the Shaanxi-Gansu-Ningxia region, and northwestern China intermontane basins. The sedimentary facies and paleogeography are diversified. In Tibet the basin evolution is largely related to the subduction and collision of the Indian Plate against the Eurasian Continent, and shows a tectonic evolution in the Cretaceous. Foraminifera are a dominant biota in the Tibet Tethys. Nonmarine sediments include variegated and red beds, coal- or salt-bearing horizons, and volcanic rocks. These deposits contain diverse and abundant continental faunas and floras, as well as important coal and oil resources. The Cretaceous stratigraphy and paleogeography in China have presented a foundation for geological studies.

关键词： China Cretaceous stratigraphy paleogeography marine nonmarine

中-新生代有孔虫古地理对西藏特提斯演变的动态响应

在线全文

学校读者我要写书评

暂无评论

地学前缘 2020年第6期27卷 116-127页

作者：万晓樵中国地质大学(北京)生物地质与环境地质国家重点实验室北京100083

有孔虫化石资料是地质历史的真实记录,对不同地质时期古地理格局和生态环境的变迁具有动态响应。西藏特提斯构造带的演化、板块相对地理位置变迁等诸多问题一直是地学界关注的热点。研究西藏特提斯沉积盆地内有孔虫动物群的古生态特征... 详细信息

有孔虫化石资料是地质历史的真实记录,对不同地质时期古地理格局和生态环境的变迁具有动态响应。西藏特提斯构造带的演化、板块相对地理位置变迁等诸多问题一直是地学界关注的热点。研究西藏特提斯沉积盆地内有孔虫动物群的古生态特征和古地理分布,能够识别生物地理区系,进而恢复不同时期的大地构造演化格局。西藏地区中、新生代古生物地理区系的分化是西藏特提斯地质演变的具体反映。西藏南部早侏罗世产底栖大有孔虫Orbitopsella喜暖动物群,晚侏罗世出现双壳类Buchia喜冷动物群。由此推测,侏罗纪新特提斯洋扩张尤其是中大西洋的开张,将位于印度大陆北缘的特提斯喜马拉雅带,从早侏罗世较低纬度的温暖位置向南推移至较高纬度的低温地区。白垩纪中期Orbitolina有孔虫类群繁盛于特提斯北侧亚洲大陆的拉萨地块和羌塘盆地,但没有出现在印度大陆。这说明当时印度大陆已脱离冈瓦纳大陆向北漂移,受四周深水环境的阻隔,Orbitolina动物群未能向印度大陆扩散。此时深水环境中生活着浮游有孔虫Ticinella Rotalipora动物群。Turonian晚期开始形成海退,拉萨地块的海洋环境基本消失。Coniacian Campanian早期印度大陆北缘浮游有孔虫继续占优势,繁盛Marginotruncana Globotruncana动物群。直至白垩纪末,印度和欧亚大陆之间的深海阻隔仍然存在,雅鲁藏布江缝合带两侧动物群一直存在根本性差异。印度大陆北缘发育着Orbitoides Omphaloceclus动物群,冈底斯南缘则以Lepidorbitoides Pseudorbitoides动物群为特征。古新世Danian期生态环境发生变化,显示大印度与亚洲大陆发生初始碰撞(66~61 Ma)。Selandian期之后,缝合带两侧才出现相同的Miscellanea Daviesina有孔虫类群,生物区系的分异基本结束。始新世早期缝合带两侧为完全相同的生物区系,共同发育底栖大有孔虫Nummulites Discocyclina动物群。有孔虫古地理证据表明,大印度与欧亚大陆的初始碰撞在古新世早期发生,时间大致在Danian期,沿雅鲁藏布缝合带的深海演变为残留海环境。小个体货币虫Nummulites willcoxi和浮游有孔虫Globigerina ouachitaensis的存在,代表特提斯喜马拉雅最高海相沉积,时代属于始新世Priabonian晚期(35~34 Ma)。随后,特提斯喜马拉雅海封闭,海水完全退出西藏境内。

关键词：有孔虫古地理中—新生代西藏特提斯演变

Effectiveness of Fuling(Poria) and its extracts against spleen deficiency in rats via tonifying spleen

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2023年第3期43卷 501-506页

作者： FENG Min JIA Ziming wan Ming FAN Bolin TANG xiaoqiao CHENG Wenhua SUN Fanzhong Hubei Provincial Key Laboratory of Applied Toxicology Hubei Provincial Center for Disease Control and PreventionWuhan 430075China Department of pharmaceutical affairs Hubei Provincial Hospital of TCMWuhan 430074China

OBJECTIVE:To observe and explore the effect of Fuling(Poria) in alleviating the spleen deficiency symptom pattern(SDSP).METHODS:We established an animal model of SDS in Sprague-Dawley(SD) rats by treating them with deficiency-inducing factors,including irregular feeding and tail clamping.Mice were administered Fuling(Poria) and its extracts(raw/cooked powder,aqueous/alcohol extract) by gavage once a day for 21 d.The body weight,rectal temperature,and spleen and thymus organ coefficients were calculated.The levels of motilin(MTL),gastrin(GAS),aquaporin 2(AQP2),interleukin 2(IL-2),IL-4,and 5-hydroxytryptamine(5-HT) in the serum and the level of AQP2 in the kidneys were evaluated by enzyme-linked immunosorbent assay.RESULTS:Fuling(Poria) and its extracts did not change the body weight,rectal temperature,and organ coefficients of the spleen and thymus.However,it reduced the levels of MTL and GAS and increased the levels of IL-2 and AQP2.In addition,the levels of IL-4 and 5-HT showed no significant alteration.CONCLUSIONS:These results suggested the crucial function of Fuling(Poria) in SDSP,especially promoting digestive function and water metabolism.

关键词： Fuling(Poria) extracts spleen deficiency symptom pattern motilin gastrins interleukins aquaporin 2 serotonin

Cenomanian-Coniacian Sea-level Change and Dissolved Oxygen Fluctuations in Tethys-Himalaya: Evidences from Benthic Foraminifera of Gamba, Tibet

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第2期87卷 501-516页

作者： JIA Jianzhong WAN Xiaoqiao CHEN Puli LI Guobiao JIANG Tian QU Haiying State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Petroleum Exploration and Exploitation Institute Sinopec Northwest Oil Field Company

Benthic foraminifera, preserved in the Late Cretaceous organic carbon-rich sediments of Gamba, southern Tibet, provide high-resolution proxies for sea-level changes and dissolved oxygen fluctuations of southeastern Tethys. The fossils were statistically analyzed and divided into three faunas of ＂Cenomanian fauna＂, ＂Turonian fauna＂, and ＂Coniacian fauna＂. A middle neritic-upper bathal environment （50-250m） was estimated considering the ratios of planktonic and epifaunal benthic foraminifera （P/（P＋E））, the morphological analysis according to the studies of recent foraminifera and the abundant distributions of depth-related species such as Alabamina creta, Laevidentalina sp., Praebulimina spp., Pleurostomella cf. naranjoensis, Pyrulina sp., Quinqueloculina spp., Haplophragmoides spp., etc. The result shows an almost parallel trend with the global transgressive and regressive cycles, but the former fluctuates more frequently at upper Cenomanian, which probably indicates tectonic instability of the continental margin. According to the benthic foraminiferal richness （BFN）, Shannon-Weiner diversity （H（s））, as well as benthic foraminiferal oxygen index （BFOI）, five periods of oxygen depleted conditions （dysoxic-anoxic） have been recognized. They correspond to the OAE2, the lower Turonian, the upper Turonian, the Turonian- Caniacian boundary event and the probably OAE3. In addition, the oxygen fluctuations in Gamba might be controlled directly by sea-level changes, while the paleoproductivity and oxygen conditions interacted with each other under oxygen deficiency environments.

关键词： benthic foraminifera bottom water oxygen sea-level Cretaceous Tethys-Himalaya

Tectonics of Central Asia——A tribute to Alfred Krner and Guowei Zhang:Preface

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2014年第4期5卷 439-443页

作者： M.Santosh Xuanxue Mo xiaoqiao wan School of Earth Sciences and Resources China University of Geosciences Beijing

1.Tribute to Alfred Krner and Guowei Zhang This special issue of Geoscience Frontiers（GSF）is a tribute vol-ume honoring the life and career of two world-renowned scientists,Professor Alfred Kroner and Academician ... 详细信息

关键词： Zhang ner and Guowei Zhang A tribute to Alfred Kr