Paleogene Sequence Stratigraphy and Sea Level Change Cycles in South Xizang (Tibet) - Last Stage in Eastern Neo-Tethyan Evolution

INTRODUCTIONAfteralongperiodofevollltionfromepicontinentalseaviariftbasinandintercontinentalseatoanoceanicbasinduringMesozoic,theeastalsNeO--tetherchangedagainideanepicontinentalseainthelateStCretaCeous.Atca80Ma,thenorthwarddriftingoftheindianplatefindlyleadtothecontaCtandinitialcollisionoftheplatewiththeEUrasiancontinent,resultinginalargeamplitudeofsealevelfallandtheconsequentlowersealevelperiodinnorthernHimalayas(Shietal.,1995).DUringPalcogene,theseaareaswererestrictedinspacelargel…     

Pioneer organisms after F-F mass extinction in Dushan region, Guizhou Province, and their significance in establishing new ecosystem

After bio-mass extinction, the ecosystems in most areas were damaged seriously and may become an “ecologically barren area” lacking or even without ecosystems. To know what the pioneer organisms would be and their development, and to trace the es- tablishment process of the ecosystems are of great importance for the study of the biological evolution and recovery in aftermath. As one of the “big five” mass extinctions in the geological history, the Late Devonian Frasnian-Famennian (F-F) e…     

上海市矿泉水资源开发利用中的管理对策

该文介绍了上海市矿泉水资源的勘查开发利用及管理历史，简要介绍了矿泉水资源特征，并对矿泉水资源开发管理中出现的问题进行了有益的探讨。     

从历史记录看地震与火山喷发关系

史料记载表明，五大连池火山1720~1721年喷发期间有大量地震活动.本文从描述这些地震活动的文字记录入手，并结合国际火山地震研究的新成果，探讨了地震类型及地震与火山喷发关系，指出震群是火山喷发的重要前兆指标，强调火山地震的监测对火山喷发预报的意义.      

An Outline of Mesozoic to Paleogene SequenceStratigraphy and Sea－Level Changes in Northern Himalayas，Southern Xizang

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古油藏、沥青及沥青包裹体在金属成矿研究中的应用

古油藏、沥青及沥青包裹体和某些金属矿床都是自然界成矿作用的产物，它们在时空关系上极为密切，成因上有内在联系，可作为研究Hg、Sb、As、An、U、Cu、Pb、Zn等改造矿床的物质来源、迁移形成、成矿物理化学条件、划分改造阶段及找矿标志等，并对探讨有机与金属成矿理论具有重要意义。     

灰色模型在甘肃东部地震预报中的应用

1.前言根据已有的地震活动资料可以看出,地震的发生在空间上极不均匀,在时间上也极不平稳,并且其过程随时间的发展也不是简单的周期性变化。因此地震的孕育和发生是随机性很强的复杂过程,用一般较简单的函数来拟合这种过程不可能得到很好效果。本文应用灰色系统中的灾变预测理论,以甘肃东部地震为例来研究地震的中长期预报问题。     

Process-facies Types and Sequences of Devonian Volcanic Sedimentary Successions in Northern Xinjiang and Their Relation to Plate Tectonics

The process-facies types of the Devonian volcanic sedimentary successions in northern Xinjiang include explosive facies, effusive facies, pyroclastic-calcareous-terrigenous tempestite facies, and coarse~-, medium~- and fine-grained pyroclastic turbidite facies, volcanic eruption tsunamite facies, syndepositional and soft-deformed seismite facies, sandy and silt-muddy contourite facies. This paper presents their characteristics and diagnostic indicators, and discusses the temporal and spatial structures of both the process-facies and the environment-facies of the Zhifang section, east Junggar, and the Mount Sarburti section, west Junggar, and their relation to plate tectonism. The author holds that the facies analysis dominated by process-facies is the facies analysis' nucleus in an orogenic belt and active continental margin.     

内乌肯菊石Neuqueniceras在西藏的发现及其由“始中央大西洋”向东的迁移

古生代末形成的联合古陆于中生代早期在其东部沿印度河—雅鲁藏布江一线再次分裂,形成了古陆东端新的特提斯洋;而在古陆西端的中部,大约是在中侏罗世的阿连期或早巴柔期,介于南美和北美大陆之间的中央大西洋扩张脊变得活动起来,导致联合古陆南、北向的分裂,在其开裂初期的前裂谷阶段,始中央大西洋以陆表海形式出现,构成了连接东太平洋和西特提斯洋生物群相互交流的海路通道。其水体的深度以及生物群的交流明显受全球海平面变化的制约,这在中侏罗世东太平洋安第斯生物区特有的生物群沿这条海路向特提斯扩散的幅度和范围上得到体现。安第斯生物区特有的菊石属——内乌肯菊石（Neuqueniceras）在我国西藏南部的首次发现表明,在中卡洛期海平面上升达到高峰期时,安第斯生物群沿始大西洋走廊向东迁移和扩散远达特提斯东端的藏南聂拉木地区。     

甘肃东南部地区地震活动特征

甘肃东南部地区地震活动频繁。该区历史上曾发生过M_s≥5.0级地震55次,其中包括M_s≥8.0级2次,7.0—7.9级6次,6.0—6.9级12次,5.0—5.9级35次。近年来该地区一直被定为重点监视区或需要注意监视的地区。因此,研究其地震活动特征对于该地区的地震监