The Geologic Time Scale and the Italian stratigraphic record

The construction of the Geologic Time Scale (GTS) is a titanic scientific challenge that has been under way for two centuries and will require much dedicated effort in the future. Italy preserves a paramount stratigraphic record of Mesozoic and Cenozoic marine sediments that have been significant in the development of the modern GTS. The Italian stratigraphic record has been histori-cally important in introducing and defining the standard Chronostratigraphic Units (CUs) of the Neogene and Quaternary. Pelagic successions from Northern Apen-nines and Southern Alps have been used in the seventies for integrating the late Cretaceous-Paleogene Geomag-netic Polarity Time Scale (GPTS) with planktonic microfossil biostratieraohv and standard CUs. This was a major contribution to the construction of a new gener-ation of GTS based on integrated magnetobiochronol-ogy. The middle Miocene to early Pleistocene marinerecord from Sicily and southern Italy has been funda-mental for establishing the recently developed Astro-nomical Time Scale (ATS). In prospect, there are many potentials still to be exploited in the Italian marine stratigraphic record for implementing the GTS by defin-ing GSSPs of various CUs, improving magneto-biochronology and extending downwards the ATS.     

苏格兰西南部达拉德变质带中的大气降水渗入和氧前锋：区域金活动性的新假？

产于达拉德变质带黑云带中变质期后石英脉由三种主要类型组成：含黄铁矿的他形成英型，含赤铁矿的他形石英型和含赤铁矿或金红石的柱状石英型。他形石英脉中的氧化矿物由先存硫化物氧化而成，金在此氧化过程中被活化。成分相似的晚期柱状结构石英晶体经历了相分离的流体形成。脉中石英的氧同位素比值不等。成矿流体含有大量大气降水的成分，其同们素组成和化学成分随着水－岩相互作用而逐渐变化。金的活化转移与再沉积在片岩地层中随     

山西全新世古地震的基本特征

本文系统地总结了山西省境内多年来发现的全新世古地震的基本特征，并将其分为七大类和若干种。文章对每种古地震遗迹的基本特征进行了描述。     

中国东北区中生代生物群特征简述

概要的总结了东北区中生代地层中古生物群，以及它们在岩石地层单位中的分布，借以说明岩石地层的时代，为地层多重划分对比提供了依据。     

Mantle processes during ocean formation：Petrologic records in peridotites from the Alpine－Apennine ophiolites

Mantle peridotites were early exposed at the sea-floor of the Jurassic Tethys derived from the subcontinental mantle of the Europe-Adria system. During continental rifting and oceanic spreading, these lithospheric peri-dotites were percolated via diffuse reactive porous flowby melt fractions produced by near-fractional melting of the upwelling asthenosphere. Ascending melts inter-acted with the lower lithosphere, dissolving pyroxenes and precipitating olivine, and crystallized at shallower levels in the mantle column causing melt impregnation.Subsequent focused porous flow formed replacive dunitechannels, cutting the impregnated oeridotites, which were conduits for upward migration of MORB-type liq-uids. Melt migration produced depletionlrefertilization and significant heating of the percolatedlimpregnated mantle, i.e the thermochemical erosion of the litho-sphere. Impregnated and thermally modified lithos-pheric mantle was cooled by conductive heat loss dur-ing progressive lithosphere thinning and was intrudeaby MORB magmas, which formed Mg-rich and Fe-richgabbroic dykes and bodies. Alpine-Apennine ophiolitic peridotites record the deep-seated migration of melts which changed their compositions and dynamics during the rift evolution. The thermochemical erosion of the lithospheric mantle by the ascending asthenospheric melts, which induces significant compositional and rhe-ological changes in the lower lithosphere, is a major process in the evolution of the continent-ocean transi-tion towards a slow spreading oceanic system.     

日本数值预报产品降水预报效果检验

对近几年日本数值预报产品的降水预报释用效果检验结果表明，该产品各时段的预报准确率仅为56．5％－69．4％，且稳定性也较差。     

如何审查地面气象观测记录

审查气象观测记录是各级业务管理人员在检查台站工作时的重要任务之一。要正确、快速地审查观测记录 ,除了检查人员要具备过硬的技术素质外 ,还要采用合理的方法 ,这样可以少走一些弯路。笔者自 1983年至今 ,先后在登封市嵩山气象站、郑州国家基准站、河南省气象局业务处从事地面气象测报和测报业务管理工作 ,在审查地面气象观测记录方面积累了一定的工作经验。现归纳整理成篇 ,以便于各级测报业务管理人员和测报业务人员在工作中参考。1　从审查值班日记和备注栏记载内容入手由于特殊的记录、不正常的情况一般在值班日记或备注栏中都有记载…