检索结果-南通市图书馆

A Review on the Global Stratotype Section and Point of the Permian-Triassic Boundary

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2005年第6期79卷 715-728页

作者： yin hongfu TONG Jinnan ZHANG Kexin Lab of Biological and Environmental Geology China University of Geosciences Wuhan Hubei 430074 State Key Lab of Geological Process and Mineral Resources China University of Geosciences Wuhan Hubei 430074

This paper provides a synthetic review of researches on Meishan Section D, the Global Stratotype Section and Point of the Permian-Triassic Boundary （PTB）. The history of research, geographic and geological setting of the section are briefly introduced. Changhsingian to ＂Griesbachian＂ conodont and ammonoid zonations, the most perfect Permo-Triassic zonations over the world, are presented, with a short discussion on the age of Otoceras, The Changhsingian to ＂Griesbachian＂ strata are subdivided into three 3rd order sequences, and the sedimentary structure of each sequence is indicated. The paper presents a correlation of the Changhsingian to ＂Griesbachian＂ magneetostratigraphy of the Meishan section with the general scale, and informed the negation of a short magnetic reversal at the PTB suggested by Zhu and Liu （1999）. Recent developments of chemostratigraphy of δ^13C and δ^34S are introduced, especially the discovery of more than one negative δ^13C excursions across the PTB. Two important molecular researches reveal the profound changes at the base of eco-system, the microbial catastrophy, and the euxinic conditions in the photic zone during the Permian-Triassic superanoxic event. The paper reports the changes in dating the age of PTB since 2001. According to recent achievements, the age of volcanogenic claybed 25, 14 cm below the PTB, is now set at 252.4±0.3 Ma. A discussion on the eventostratigraphy concludes that, although there is a major event episode at beds 25-26, the events across the PTB at Meishan are multi-episodic and commenced prior to the Event Beds 25-26, thus the possibility that the mass extinction was mainly induced by an exterrestrial impact is largely excluded.

关键词： review Global Stratotype Section and Point Permian-Triassic Boundary Meishan China

Evolution of drainage systems and its developing trend in connection with tectonic uplift of Eastern Kunlun Mt.

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2000年第20期45卷 1904-1908页

作者： LI Chang’an yin hongfu YU Qingwen Faculty of Earth Sciences China University of GeoscienceWuhan 430074China China Geological Survey Bureau Beijing 100812China

The Eastern Kunlun Mt. had been subjected to uplift together with the Qinghai-Xizang (Tibet) Plateau before the Early Pleistocene, and yet the Mt. did not protrude out of the Plateau surface. During that period lakes spread all over the studied region, with the drainage systems being all short rivers flowing into the lakes. At the end of the Early Pleistocene, intensive tectonic uplift led to the rising of the Eastern Kunlun Mt. and made the Mt. protrude onto the Plateau surface. As a result, a fault depression valley formed extending nearly from west to east along the fault belt of the Southern Kunlun Mt. Lakes in this region died out, surface runoffs joined into the valley of the Southern Kunlun Mt. resulting in a large river streaming nearly from west to east. Around 150 kaBP, because of the strong differential movement, rivers, such as the Jialu River and the Golmud River, retrogressively eroded seriously, cutting through the Burhan Budai Mt. Then they pirated the large river and divided it into

关键词： Eastern Kunlun Mt. drainage systems tectonic uplift retrogressive erosion Quaternary.

Discussion on geobiology, biogeology and geobiofacies

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2008年第11期51卷 1516-1524页

作者： yin hongfu XIE ShuCheng QING JianZhong YAN JiaXin LUO GenMing Key Laboratory of Biogeology and Environmental Geology of Ministry of Education China University of GeosciencesWuhan 430074China State Key Laboratory of Geological Process and Mineral Resources China University of GeosciencesWuhan 430074China Wuxi Institute of Petroleum Geology SINOPECWuxi 214151China

Here we first discuss the definition of and the difference between geobiology and biogeology following a brief introduction of recent geobiology research in China. Geobiology is defined as an interdisciplinary study of life sciences and earth sciences, and biogeology as an interdisciplinary study of biology and geology. Scope of the term geobiology covers that of the term biogeology. Branch interdisciplines of both are listed. We then propose the term geobiofacies, defined as the facies of a geologic body embodying the whole process of interaction between organisms and environments. Differences among geobiofacies, biofacies, and organic facies are discussed. Main parameters defining a geobiofacies include habitat type, biotic composition and productivity, paleo-oxygenation regimes, and early diagenesis phases. Each of them is discussed in detail, and a semi-quantitative assessment of the biogeofacies of source rocks is proposed based on these parameters. A two-fold terminology for geobiofacies is recommended, namely, the biological and environmental aspects of biota and the redox conditions during life-burial-diagenesis process

关键词： geobiology biogeology geobiofacies

Mass extinction and Pangea integration during the Paleozoic-Mesozoic transition

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2013年第10期56卷 1791-1803页

作者： yin hongfu SONG HaiJun State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

The greatest Phanerozoic mass extinction happened at the end-Permian to earliest Triassic. About 95% species, 82% genera, and more than half families became extinct, constituting the sole macro-mass extinction in geological history. This event not only caused the great extinction but also destroyed the 200 Myr-long Paleozoic marine ecosystem, prompted its transition to Mesozoic ecosystem, and induced coal gap on land as well as reef gap and chert gap in ocean. The biotic crisis during the Paleozoic-Mesozoic transition was a long process of co-evolution between geospheres and biosphere. The event sequence at the Permian-Triassic boundary （PTB） reveals two-episodic pattern of rapidly deteriorating global changes and biotic mass ex- tinction and the intimate relationship between them. The severe global changes coupling multiple geospheres may have affect- ed the Pangea integration on the Earth＇s surface spheres, which include： the Pangea integration→enhanced mountain height and basin depth, changes of wind and ocean current systems; enhanced ocean basin depth→the greatest Phanerozoic regression at PTB, disappearance of epeiric seas and subsequent rapid transgression; the Pangea integration→thermal isolation effect of continental lithosphere and decrease of mid-ocean ridges→development of continental volcanism; two-episode volcanism causing LIPs of the Emeishan Basalt and the Siberian Trap （25%251 Ma）→global warming and mass extinction; continental aridification and replacement of monsoon system by latitudinal wind system→destruction of vegetation; enhanced weathering and CH4 emission→negative excursion of δ^13C; mantle plume→crust doming→regression; possible relation between the Illawarra magnetic reversal and the PTB extinction, and so on. Mantle plume produced the Late Permian LIPs and mantle convection may have caused the process of the Pangea integration. Subduction, delamination, and accumulation of the earth＇s cool lithospheric material at the ＂D＂ layer of CMB st

关键词： Permian-Triassic boundary mass extinction Pangea integration multi-sphere coupling mantle plume

同方期刊数据库

New paleontological evidence on time determination of the east part of the Eastern Kunlun Mélange and its tectonic significance

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2004年第10期47卷 865-873页

作者： ZHANG Kexin LIN Qixiang ZHU Yunhai yin hongfu LUO Mansheng CHEN Nengsong WANG Guocan Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China

New paleontological evidence suggests that the composition of the matrix and slices from the middle and the south of the Eastern Kunlun Mélange Belt is very complex, ranging from Proterozoic to Mesozoic in geological time. A Cambrian acritarch assemblage has been discovered from the middle part of the Eastern Kunlun Mélange, a Neoproterozoic to the early Paleozoic acritarch assemblage has been discovered from the south of the Eastern Kunlun Mé lange, and so has been an Early Permian radiolarian from the A’nyemaqen Mélange in Buqing- shan. In addition, some sporopollen has been obtained from the Mesozoic tectonic slices. The above-mentioned paleontological evidence indicates that the Eastern Kunlun Orogenic Belt experienced two episodes from ocean to continent from the Neoproterozoic to the Early Paleo- zoic and in the Late Paleozoic respectively. In the process of intracontinent development in Mesozoic, because of heavy thrust-nappe, strike-slip sheer and crust shortening, the Mesozoic formation was intercalated in mélange by slices and the Eastern Kunlun Orogenic Belt became more complex.

关键词： Eastern Kunlun Melange Belt, paleobio-assemblage, time determination, geotectonic evolution.

Geobiological approach to evaluating marine carbonate source rocks of hydrocarbon

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2011年第8期54卷 1121-1135页

作者： yin hongfu XIE ShuCheng YAN JiaXin HU ChaoYong HUANG JunHua Tenger QIE WenKun QIU Xuan State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Wuhan 430074 China State Key Laboratory of Geological Process and Mineral Resources China University of Geoscience Wuhan 430074 China Wuxi Institute of Petroleum Geology SINOPEC Wuxi 214151 China

Evaluating the pre-Jurassic marine source rocks in China has been difficult because these rocks are generally too highor over-maturated for most traditional methods to *** to the remaining parameter TOC (%),its lower limit for recognizing the carbonate source rocks in China has been in *** Phanerozoic sections in the Middle-Upper Yangtze Platform and the Guizhou-Hunan-Guangxi Basin have been studied in search for a different approach to complementing the traditional evaluation method for these source *** have applied a geobiological approach to tracing the organic carbon (OC) output and accumulation from the living stage (primary productivity) to the post-mortem deposited remains,and finally to the preserved burial *** biological and geological parameters are employed to represent the OC of the three stages.A series of proxies of these parameters are discussed and integrated to establish a geobiological evaluation system independent of TOC and other traditional *** we use the Guangyuan section in Sichuan as an example for the geobiological *** results indicate that in the argillaceous rocks,the geobiological parameters show the qualified source rocks in accordance with high TOC values;but in the carbonates,the good source rocks delineated by the geobiological parameters have a wide range of TOC,from 0.03% to 1.59%,mostly<0.3%.We suggest that it is still premature to set TOC=0.3% or 0.5% as the lower limit for the pre-Jurassic carbonate source rocks in South China.

关键词： geobiological evaluation carbonate source rocks parameters proxies

Early Palaeozoic Evolution of the Zhen' an- Xichuan Block and the Small Qinling Multi-Island Ocean Basin

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 1996年第1期70卷 1-15页

作者： yin hongfu Huang DinghuaChina U niversity of Geosciences, W uhan, Hubei China University of Geosciences Wuhan Hubei

Based on studies of palaeogeography, palaeobiogeography, palaeomagnetism, geochemistry and volcanism, this paper proposes that the Zhen'an-Xichuan area was a small Early Palaeozoic block rifted away from South Qinling and suturing onto North Qinling earlier than the other parts of South Qinling. In the Early Palaeozoic Qinling was a small archipelagic ocean basin with 5 rows of islands including the Zhen'an-Xichuan block. The drifting of the Yangtze and North China plates and the islands between them in the same direction at different speeds caused their suturing process to be different from the classic plate collision, which is the major feature of the suturing of the multi-island Tethys ocean basin. This also explains the problem that the Caledonian collision did not result in orogeny in eastern Qinling.

关键词： Eastern Qinling multi-island small ocean basin Caledonian movement Zhen'an-Xichuan block

Volcanism at the Permian-Triassic Boundary in South China and Its Effects on Mass Extinction

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 1989年第4期63卷 417-431,450-451页

作者： yin hongfu, Huang Siji, Zhang Kexin, Yang Fengqing, Ding Meihua, Bi Xianmei and Zhang Suxin China University of Geosciences, Wuhan, Hubei China University of Geosciences Wuhan Hubei

This paper discusses the clayrocks widespread at the Permian-Triassic boundary, which are mostly of volcanic origin. Volcanogenetic textures, structures and minerals such as high-temperature quartz are found in clayrocks at the Permian-Triassic boundary in many places. Thousands of microspherules have been collected from the Boundary clayrocks, many of which exhibit the typical features of the process from melting to cooling and solidification. indicating that they were formed by volcanic eruption or extraterrestrial impact. Volcanic effects on the Permian-Triassic mass extinction may be reflected in conodonts, algae and ammonoids. The Boundary clayrocks are found in many Permian-Triassic sections along the coast of Tethys. Their orighin remains to be studied.

关键词： Volcanism at the Permian-Triassic Boundary in South China and Its Effects on Mass Extinction Mass

The fluctuating environment associated with the episodic biotic crisis during the Permo/Triassic transition:Evidence from microbial biomarkers in Changxing,Zhejiang Province

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2007年第7期50卷 1052-1059页

作者： HUANG XianYu JIAO Dan LU LiQiang XIE ShuCheng HUANG JunHua WANG YongBiao yin hongfu WANG HongMei ZHANG KeXin LAI XuLong Key Laboratory of Biogeology and Environmental Geology Ministry of Educationand the State Key Laboratory of GPMRChina University of GeosciencesWuhan 430074China Faculty of Material Science and Chemical Engineering China University of GeosciencesWuhan 430074China School of Environmental Studies China University of GeosciencesWuhan 430074China

The environmental conditions and the biotic crisis during the Permo-Triassic (Tr/P) transition received increasing attention in the past decades. Presented herein are the molecular fossil records of cyano-bacteria and green sulfur bacteria,the base of the marine ecosystem,to highlight the episodic nature of both the environment and the biotic crisis during this critical period. At least two episodes of cyano-bacterial expansion are documented by 2-methylhopanes ranging from C28 to C32 in carbon number,indicative of the instable marine ecosystem and the fluctuant aquatic nutrients. Meanwhile,the index of 2-alkyl-1,3,4-trimethylbenzenes (biomarkers of green sulfur bacteria) and the ratio of pristane to phy-tane (Pr/Ph) witness the fluctuation of sedimentary environmental redox conditions. The above mo-lecular evidence suggests the occurrence of highly fluctuating environmental conditions during the Tr/P transition,which is consistent with,and probably the cause of,the multi-phased biotic crisis and the prolonged faunal recovery.

关键词： cyanobacteria green sulfur bacteria molecular fossil Tr/P transition environment