|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Tectonic Evolution of the Palaeo——Tethys in Changning——Menglian Belt and Adjacent Regions,Western Yunnan显示文摘The Changning-Menglian belt,located between theBaoshan-Gengma massif and the Simao-Lincangmassif in Western Yunnan,preserves the complete recordof a suture zone and the most continuous record of deepwater sedimentation,representing the main branch of thePalaeo-Tethys polyisland ocean in the Hercynian-Indo-sinian stage.This belt could be further subdivided into threetectono-lithofacies zones.In the east zone,terrigenouselastics,argillaceous,marl-argillaceous and silicate sediments lie on the metamorphosed Early Palaeozoic basement in concealed unconformity,representing deep watersediments on a passive continental margin.The centralzone,although the basement rocks are absent fromoutcropping here,includes a contemporary complexof various sedimentary types,among them one type is ofdeep ocean sediments represented by radiolarian beddedchert,appearing from at least early Early Devonian tothe Middle Triassic.Another type includes purecarbonates of the Early Carboniferous to the LatePermian,a type of shallow | Liu Benpei Feng Qinglai Fang NianqiaoChina University of Geosciences , Beijing 100083 | 1991 | Journal of Earth Science1991，10，1： | 22 |
| 2 | Devonian Sea-Level Change Rhythms in South China and Coupling Relationships Among the Earth-spheres显示文摘Twenty orthosequences and their corresponding sea-level change (SLC) cycles have been recognized in the Devonian overlying the Caledonian unconformity, of which 9, 5.5 and 5.5 occurred in the Lower, Middle and Upper Devonian respectively. They can be grouped into 4 orthosequence sets, in which the maximum flooding surfaces lie in the sulcutus Zone (D12), perbonus Zone (D13), Middle and Upper varcus Zone (D22) and gigas Zone (D21) respectively. Four instant palaeogeographical reconstructions of South China have been made in the Emsian and Givetian. Devonian sea-level change rhythms of South China can be divided into 3 categories: the autorhythmic, the worldwide and regional allorhythmic, and the coupling-rhythmic. They developed respectively in the Famennian, Pragian, Eifelian, Lochkovian, Emsian, Givetian, Frasnian and the F / F (between the Frasnian and Famennian) event. The cause of the worldwide allorhythmic SLC of the Pragian and Eifelian under comparatively dry, warm and tranquil conditions may | Gong Yiming,Faculty of Earth Science, China University of Geosciences, Wuhan,Hubei, 430074Wu Yi,Guangxi Institute of Geology, Nanning, GuangxiDu Yuansheng, Feng Qinglai and Liu BenpeiChina University of Geosciences, Wuhan, Hubei, 430074 | 1997 | Acta Geologica Sinica(English Edition)1997，71，4： | 10 |
| 3 | Paleo-productivity evolution across the Permian-Triassic boundary and quantitative calculation of primary productivity of black rock series from the Dalong Formation, South China显示文摘The change of the primary productivity across the Permian-Triassic boundary(PTB)remains controversial.In this study,records from two deep-water sections in South China(Xiakou and Xinmin sections)show the primary productivity decreased gradually from the latest Permian to the earliest Triassic,and five evolutionary stages Increase-Decrease-Recovery-RecessionStagnation)can be observed from Clarkina changxingensis-C.deflecta to Hindeodus parvus-Isarcicella isarcica zones.Primary productivity decreased abruptly from the base of C.meishanensis zone.Besides,for adjusting to the deterioration of the oceanic environment,the primary producers in the oceanic surface had changed to acritarch and cyanobacteria,which were more tolerant of stressful environment.Then the producers were under huge stagnation in the H.parvus-I.isarcica zone.The values of quantitative calculation of the primary productivity from the black rock series in the Dalong Formation were very high,corresponding to that of an upwelling area in modern ocean,which shows that the strata of the Dalong Formation in the study region are potential hydrocarbon source-rocks.This result may come from the fact that South China craton was located at the equatorial upwelling area during the Permian-Triassic transitions.But organic matter contents were different in various sections because they could be affected by redox conditions and diagenesis process after burial. | SHEN Jun ZHOU Lian FENG QingLai ZHANG MuHui LEI Yong ZHANG Ning YU JianXin GU SongZhu | 2014 | Science China Earth Sciences2014，57，7： | 8 |
| 4 | Uppermost Permian Radiolaria from Southwestern China显示文摘SinceNeoalbailela(Radiolaria)wasdescribedbyTake-muraandNakaseko(1981),theocurenceofthisgenushasbeenreportedfromEurope,NorthAm... | Feng Qinglai Fang Nianqiao Zhang Zhenfang Huang Junhua Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 | 1998 | Journal of Earth Science1998，17，3： | 7 |
| 5 | Geochemistry,Zircon U-Pb Age and Hf Isotopic Constraints on the Petrogenesis of the Silurian Rhyolites in the Loei Fold Belt and Their Tectonic Implications显示文摘Zircon U-Pb dating, Lu-Hf isotopic and geochemical data for the Silurian rhyolites from the Loei fold belt are presented to constrain their petrogenesis and tectonic settings. The rhyolites give a weighted mean ^(206)Pb/^(238) U age of 423.7±2.7 Ma, and are characterized by high SiO_2, Al_2O_3, K_2 O and low MnO, MgO and P_2O_5. All samples are enriched in LILEs(e.g., Ba, K, Pb) and LREEs and depleted in HFSEs(e.g., Nb, Ta, Ti) with obvious negative Eu-anomalies(δEu=0.56–0.63). The calc-alkaline rhyolites are typical arc-related rocks. The Loei rhyolites have high A/CNK ratios(1.19–1.34) and positive εHf(t)(4.03–5.38), which can be interpreted as partial melting of juvenile crustal materials followed by multistage melting and differentiation, similar to highly fractional I-type rocks. Combined with regional geological surveys, the Loei rhyolites should be formed in a volcanic arc environment and may be in contact with the Truong Son fold belt during the Early Paleozoic. Moreover, the Simao Block might be in contiguity with the Indochina Block during Silurian. | Tianyu Zhao Xin Qian Qinglai Feng | 2016 | Journal of Earth Science2016，27，3： | 6 |
| 6 | Changhsingian radiolarian fauna from Anshun of Guizhou,and its relationship to TOC and paleo-productivity显示文摘Abundant siliceous micro-fossils were found from the Dalong Formation,Xinmin section,Guizhou,which include nine species of radiolarians belonging to seven genera as well as nine types of siliceous spongy spicules.The radiolarian fauna consists of all spherical radiolarians,without any species of Albaillellaria and Latentifistularia,indicating a relative shallow water sedimentary environment.The high relative co-efficient between the radiolarian abundance and total organic carbon(TOC)shows that the radiolarian assemblage represented by Copicyntra and Paracopicyntra can be used as a proxy to the paleo-productivity.However,the relative co-efficient between biogenic silica and the radiolarian and sponge spicule abundances is low.A possible explanation is that an oceanic circulation has changed the biogenic silica content after radiolarian test and siliceous spongy spicule were dissolved. | XIANG Yu FENG QingLai SHEN Jun ZHANG Ning | 2013 | Science China Earth Sciences2013，56，8： | 6 |
| 7 | Geochemical and geochronological constrains on the Chiang Khong volcanic rocks (northwestern Thailand) and its tectonic implications显示文摘在在 Chiang Khong 区域主导地暴露的西北的泰国的暴烈的岩石,通常被认为遗传上被连接到 Paleo-Tethyan 海洋的构造进化。暴烈的岩石主要由 andesitic 组成到 rhyolitic 岩石并且传统地作为二叠三叠纪的序列被印射。我们二 andesitic 取样的锆石 U-Pb geochronological 结果表演(TL-1-B 和 TL-31-B ) ,姚尧的代表是暴烈的地区,并且给一个平均数 241.2 的加权的年龄?? | Xin QIAN Qinglai FENG Chongpan CHONGLAKMANI Denchok MONJAI | 2013 | Frontiers of Earth Science2013，7，4： | 5 |
| 8 | Study on the geochemical characteristics of ocean-ridge and oceanic-island volcanic rocks in the Nan-Uttaradit zone, northern Thailand显示文摘Field investigations and laboratory integrated research as indicated that ophiolite mélange in the Nan-Uttaradit zone, northern Thailand, consists of fragments of tectonites such as metamorphic peridotite (extremely silicified serpentinite), cumulates (pyroxenolite, gabbro, and gabbro-diorite), ocean-ridge basalt, oceanic-island ba-salt and radiolarian silicalite, and it was formed during D3-P. The rock series, rock types and petrogeochemical characteristics of metamorphic tholeiites in the Nan area of the Nan-Uttaradit zone are similar to those of ocean-ridge basalts (C1) in China's Ailaoshan zone. As for the Hawaiites in the Nan area of the Nan-Uttaradit zone, their major elements, REEs and trace elements are similar to those of oceanic-island basalts in China's Jinshanjiang zone (P11). In the Uttaradit area of this zone the metamorphic alkaline basalts show transitional petrogeochemical characteristics between ocean-ridge basalts and oceanic-island basalts, which were still formed in oceanic-island environments. The above-described basalts are all oceanic volcanic rocks and they are the most important part of the Paleo-Tethys oceanic crust in the Nan-Uttaradit zone. | SHEN Shangyue FENG Qinglai YANG Wenqiang ZHANG Zhibin Chong pom Chong lakmani | 2010 | Chinese Journal Of Geochemistry2010，29，2： | 5 |
| 9 | Proto-Tethys ophiolitic mélange in SW Yunnan: Constraints from zircon U-Pb geochronology and geochemistry显示文摘An early Paleozoic Proto-Tethys ocean in western Yunnan has long been postulated although no robust geological evidence has been identified.Here we investigated the recently-identified Mayidui and Wanhe ophiolitic mélanges in SW Yunnan,which occurs in a N-S trending belt east of the late Paleozoic Changning-Menglian suture zone.The ophiolites consist mainly of meta-basalts(amphibole schists),meta-(cumulate)gabbros and gabbroic diorites,and meta-chert-shale,representing ancient oceanic crust and pelagic and hemipelagic sediments,respectively.Six samples of gabbros and gabbroic diorites from 3 profiles(Mayidui,Kongjiao and Yinchanghe)yielded zircon U-Pb ages between 462±6 Ma and 447±9 Ma,constraining the formation of the Mayidui and Wanhe ophiolites to Middle Ordovician.Gabbros from the Mayidui and Kongjiao profiles share similar geochemical characteristics with affinities to tholeiitic series,and are characterized by depleted to slightly enriched LREEs relative to HREEs with(La/Sm)N=0.69-1.87,(La/Yb)N=0.66-4.72.These,along with their predominantly positive wholerock eNd(t)and zircon eHf(t)values,indicate a MORB-like magma source.By contrast,the meta-mafic rocks from the Yinchanghe profile show significantly enriched LREEs((La/Sm)N=0.97-3.33,(La/Yb)N=1.19-14.93),as well as positive whole-rock eNd(t)and positive to negative zircon eHf(t)values,indicating an E-MORB-type mantle source.These geochemical features are consistent with an intra-oceanic setting for the formation of the Mayidui-Wanhe ophiolites.Our data,integrated with available geological evidence,provide robust constraints on the timing and nature of the Mayidui-Wanhe ophiolitic mélange,and suggest that the ophiolites represent remnants of the Proto-Tethys Ocean,which opened through separation of the Indochina and Simao blocks from the northern margin of Gondwana before the Early Cambrian,and evolved through to the Silurian. | Guichun Liu Zaibo Sun Jianwei Zi M.Santosh Tianyu Zhao Qinglai Feng Guangyan Chen Xiaomei Nie Jing Li Shitao Zhang | 2021 | Geoscience Frontiers2021，12，5： | 5 |
| 10 | New Siliceous Microfossils from the Terreneuvian Yanjiahe Formation,South China:The Possible Earliest Radiolarian Fossil Record显示文摘Radiolarians form an important part of the planktonic realm in the ocean of Early Paleozoic, but their origin and evolutionary processes has long been enigmatic. The ancestral representatives of radiolarians have been considered to belong to the order Archaeospicularia, whose unquestionable fossil records were dated back to the Middle Cambrian. Here we report ?Blastulospongia and unnamed spherical radiolarians in the Terreneuvian from the Yanjiahe Formation in Hubei Province, South China. Blastulospongia is an enigmatic siliceous microfossil genus, with affinities proposed amongst the radiolarian, sphinctozoan-grade sponges and uncertain protists. As for the newly discovered unnamed radiolarians, morphologically they possess latticed shell, spherical shape and are all small in size. Our discoveries support the idea that spherical radiolarians is an ancient representative, whose origin and diversification was probably much earlier than generally accepted. The hypothesis that the oldest radiolarians belong to the order Archaeospicularia needs to be re-examined. | Shan Chang Qinglai Feng Lei Zhang | 2018 | Journal of Earth Science2018，29，4： | 5 |
| 11 | Paleoproductivity and Paleoredox Condition of the Huai Hin Lat Formation in Northeastern Thailand显示文摘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 SiO_2, 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, contains relatively lower TOC as it possesses a less reducing condition compared to the more reducing intervals. The lower bed 13 of the upper part shows a less reducing condition and a lower TOC, which conforms to a lower productivity. The organic matters of the Huai Hin Lat Formation consist mainly of AOM and acritarchs and possess good to excellent TOC(2%–7%). They belong mainly to type I and type II kerogens with some mixture of type III as indicated by the presence of phytoclasts, spores, and pollen. The organic matters of the Huai Hin Lat Formation, based on the kerogen type and the thermal history, have already generated significant amount of oil and some gas to the Sap Phlu Basin. | Boonnarong Arsairai Akkhapun Wannakomol Qinglai Feng Chongpan Chonglakmani | 2016 | Journal of Earth Science2016，27，3： | 5 |
| 12 | Petrochemistry and Tectonic Setting of the Middle Triassic Arc-Like Volcanic Rocks in the Sayabouli Area,NW Laos显示文摘The volcanic rocks from the Sayabouli area in northwestern Laos have been poorly studied. These volcanic rocks are traditionally mapped as the Permian–Early Triassic sequences on the geological map. One basaltic-andesite from the Sayabouli area yields a zircon U-Pb age of 237.7±1.7 Ma, suggesting a Middle Triassic origin. All basalt and basaltic-andesite samples from the Sayabouli area show depletions in HFSEs(e.g., Nb, Ta, Ti) and have high LILE/HFSE ratios, and exhibit the geochemical affinity to the continental arc volcanic rocks and are geochemically similar to the continental arc volcanic rocks from the Phetchabun belt in northeastern Thailand, suggesting a Late Permian–Middle Triassic continental margin in the Sayabouli area of northwestern Laos and Phetchabun area of northeastern Thailand. Our data indicate that the Phetchabun arc volcanic belt through the western Loei sub-belt can be linked to the Sayabouli area in northwestern Laos. | Xin Qian Qinglai Feng Yuejun Wang Wenqiang Yang Chongpan Chonglakmani Denchok Monjai | 2016 | Journal of Earth Science2016，27，3： | 5 |
| 13 | Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China显示文摘The Changning-Menglian belt, distributed over southwestern Yunnan Province in Southwest China, contains oceanic rocks that are considered to be remnants of the Paleotethys. This study observed Triassic siliceous rocks of the Muyinhe Formation in the Changning-Menglian belt and analyzed their geochemistry. The samples have high concentrations of SiO_2(81.65 wt.%–88.38 wt.%; average: 84.99 wt.%±2.14 wt.%). Most of the samples were plotted in the non-hydrothermal field on the Al-Fe-Mn diagram. Most of the samples were plotted in the continental margin field on the Fe_2O_3/TiO_2-Al_2O_3/(Al_2O_3+Fe_2O_3) and(La/Ce)N-Al_2O_3/(Al_2O_3+Fe_2O_3) diagrams. Moreover, the samples show a flat REE(rare earth element) pattern normalized to NASC(North America shale composite). These geochemical results, in addition to the lack of rhythmical bedding of the siliceous rocks, strongly suggest that the siliceous rocks are unlikely to represent pelagic deposits. Although previous studies have suggested that the siliceous rocks are pelagic deposits, the present results indicate that the extent of the pelagic ocean basins in the Paleotethys during the Triassic is probably less than previously believed. These non-pelagic deposits may represent the closure stage of the Paleotethys. | Tsuyoshi Ito Xin Qian Qinglai Feng | 2016 | Journal of Earth Science2016，27，3： | 4 |
| 14 | Geochemical characteristics of the oceanic islandtype volcanic rocks in the Chiang Mai zone,northern Thailand显示文摘The oceanic island volcanic rocks in the Chiang Mai zone, northern Thailand, are usually covered by Lower Carboniferous and Upper Permian shallow-water carbonate rocks, with the Hawaii rocks and potash trachybasalt being the main rock types. The alkaline series is dominant with sub-alkaline series occurring in few cases. The geochemical characteristics are described as follows: the major chemical compositions are characterized by high TiO2, high P2O5 and medium K2O; the rare-earth elements are characterized by right-inclined strong LREE-enrichment patterns; the trace element patterns are of the upward-bulging K-Ti enrichment type; multi-component plots falling within the fields of oceanic island basalts and alkali basalts, belonging to the oceanic island-type volcanic rocks, which are similar to the equivalents in Deqin and Gengma (the Changning-Menglian zone) of Yunnan Province, China. | SHEN Shangyue FENG Qinglai ZHANG Zhibin CHONGPAN Chonglakmani | 2009 | Chinese Journal Of Geochemistry2009，28，3： | 4 |
| 15 | Biotic evolution and its relation with geological events in the Proterozoic Yanshan Basin, North China显示文摘The Yanshan Basin,located in northern North China,underwent three primary stages in the Mesoproterozoic,and corresponding biotas have been summarized for each stage in the present study.The three stages are stage A(the lower part of the Changcheng Group which dominated by clastic sediments),stage B(the upper part of the Changcheng Group to the Jixian Group which characterized by carbonate sediments),and stage C(the upper part of the Jixian Group which dominated by clastic sediments).This paper will focus on the evolution of biota during stage B.Microbiota of the stage B exhibits a high level of diversity and abundance.Planktonic microfossils have various forms and complex decorations.Most microfossils are small.In stage B,there was great variation in the biotic abundance and diversity,the average diameter of spherical benthic microfossils,and the maximum diameter of the spherical microfossils.We analyzed these parameters and identified two typical biotic events,and both biotic events were corresponded with geological events.The first event occurred in the third member of the Dahongyu Formation.In this era,the maximum diameter of the silicified microfossils significantly increased,and large,spherical planktonic specimens are abundant.The flourishing of large organisms in the strata is presumably related to volcanic activity.The second event occurred in the third member of the Gaoyuzhuang Formation.During this era,the microfossil assemblage changed significantly.The changes correspond with a decline in stromatolites as well as the transformations of the carbon isotope ratios and the elemental geochemistry. | SHI Min FENG QingLai ZHU ShiXing | 2014 | Science China Earth Sciences2014，57，5： | 4 |
| 16 | High-resolution cyclostratigraphy of geochemical records from Permo-Triassic boundary section of Dongpan,southwestern Guangxi,South China显示文摘Spectral analysis is applied to geochemical data from a deep-water Permian-Triassic Boundary (PTB) section across PTB in Dongpan, Guangxi for high-resolution cyclostratigraphic research. The characteristics of the Milankovitch Cycles have been well recorded in the strata of the Dongpan section. Spectrum on Ce/La records shows especially that the ratios among its three preponderant cycles in the section are 5:2:1, which well displays the phenomenon of the sedimentary cycles driven by orbital force. The Milankovitch theory is further confirmed by the Paleozoic records. | PENG XingFang FENG QingLai Li ZhouBo MENG YouYan | 2008 | Science China Earth Sciences2008，51，2： | 4 |
| 17 | Geochemical and Geochronological Constraints on the Origin of the Meta-basic Volcanic Rocks in the Tengtiaohe Zone, Southeast Yunnan显示文摘The meta-basic volcanic rocks in the Tengtiaohe Zone yield zircon U–Pb ages of 258.8±2.5 Ma and 259.2±1.8 Ma, respectively which agree with the ages of flood basalts of ELIP and are similar to the basaltic rocks and komatiites from the Song Da Zone in northern Vietnam. The results suggest that the age of meta-basic volcanic rocks is Late Permian, rather than the Early Permian or Early Carboniferous ages as previously inferred. Most meta-basic volcanic rocks are strongly enriched in LREEs relative to HREEs and display trace element patterns similar to the ELIP high-Ti basalts, and are enriched in LILEs with negative Sr anomalies. Their initial ^(87)Sr/^(86) Sr ratios range from 0.705974 to 0.706188 and εNd(t) from-0.82 to-2.11. Their magmas were derived from an enriched and deep mantle source without significant crustal contamination. These meta-basic volcanic rocks formed in ELIP. Therefore, the Tengtiaohe Zone is not an ophiolite zone and can link to the Song Da Zone in northern Vietnam. | QIAN Xin FENG Qinglai WANG Yuejun ZHANG Zhibin | 2016 | Acta Geologica Sinica(English Edition)2016，90，2： | 3 |
| 18 | Geochronological and geochemical constraints on the petrogenesis of late Mesoproterozoic mafic and granitic rocks in the southwestern Yangtze Block显示文摘Late Mesoproterozoic igneous rocks in the SW Yangtze Block are important for understanding the role of it in reconstruction of the Rodinia supercontinent.In the present study,we report new geochronological,geochemical,and Nd-Hf isotopic data for the Cuoke plagioclase amphibolites and granites in the SW Yangtze Block.Geochronological results show that the plagioclase amphibolites and granites have similar late Mesoproterozoic zircon U-Pb ages of 1168-1162 Ma,constituting a bimodal igneous assemblage.The plagioclase amphibolites have high and variable TiO2 contents(1.15-4.30 wt.%)and Mg#(34-66)values,similar to the tholeiitic series.They are characterized by enrichment in LREEs and LILEs,and have OIB-like affinities with positive Nb and Ta anomalies.The plagioclase amphibolites have positive whole-rockεNd(t)(+3.2 to+4.3)and zirconεHf(t)(+4.3 to+10.7)values,indicating that they were derived from an OIB-like asthenospheric mantle source.The granites belong to the reduced peralkaline A-type series and have negativeεNd(t)value of-6.0 andεHf(t)values of-5.8 to-13.8,indicating a derivation from the partial melting of ancient mafic lower crust.In combination with the~1.05-1.02 Ga bimodal igneous assemblage in the SW Yangtze Block,we propose that the Cuoke 1168-1162 Ma igneous rocks were likely formed in a continental rift basin and argue against the existance of Grenvillian Orogen in the SW Yangtze Block during the late Mesoproterozoic. | Guichun Liu Jing Li Xin Qian Qinglai Feng Wei Wang Guangyan Chen Shaobin Hu | 2021 | Geoscience Frontiers2021，12，1： | 3 |
| 19 | Devonian Sequence Stratigraphy and Sea Level Change Cycles in South China显示文摘The Devonian is well developed in South China and has drawn a great attention from the geologists both at domestic and abroad. On the basis of study on the sequence stratigraphy in more than 10 sections in Guizhou, Guangxi, Longmenshan and Southern Qinling within South China we have identified 21 sequences and T-R cycles that correspond to third-order sea level changes. These sea level change cycles were controlled by autorhythm(Pragian,Eifelian), allorhythm(Lochkovian,Emsian,Givetian) and coupling rhythm mechanisms (frasian, Famennian and F-F boundary). | Du Yuansheng Gong Yiming (Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074) Wu Yi (Guangxi Institute of Geology, Nanning 530023) Liu Benpei Feng Qinglai (Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074) | 1996 | Journal of Earth Science1996，15，1： | 3 |
| 20 | The Upper Ordovician Microfossil Assemblages from the Pagoda Formation in Zigui, Hubei Province显示文摘The Pagoda Formation is a lithologically and biologically distinctive unit among the Upper Ordovician. The strata are characterized by a nodular limestone, which yields fossil assemblages of high diversity. Conodonts of 14 genera 20 species(6 undetermined species) and ostracods of 14 genera 26 species(16 undetermined species) are identified. In addition, spherical radiolarians and minute-walled foraminifers were first reported from this formation in South China. The conodont assemblage is attributed to the Hamarous europaeus Zone, which indicates the Early Katian Age. The conodont HDS biofacies, along with thin-shelled ostracods, spherical radiolarians and foraminifers, suggest relatively deep and quiet water depositional environment. Accordingly, these fossil materials not only enrich the diversity of the Pagoda biota, but also provide evidence for discussion of depositional environments and stratigraphic correlations for the Pagoda Formation. | Ke Zhang Aihua Yuan Qinglai Feng | 2018 | Journal of Earth Science2018，29，4： | 3 |
您所在的机构暂未开通此部分的功能，请联系管理员