吉林海沟金矿地质特征及应力场分析

海沟金矿是大型石英脉型金矿床,矿体严格受NE向断裂构造控制,成矿时代为晚侏罗世-早白垩世.矿石中金属矿物以黄铁矿、自然金、方铅矿和黄铜矿为主.28号主矿脉中,Au平均品位20.59×10^-6.成矿物质来自地层和岩体.对构造应力场研究表明,矿区有3期构造应力场,分别是早期近S-N向挤压、中期NW向挤压和晚期NE向挤压.成矿期应力场最大主压应力方向为NE向.     

吉林四平山门银矿区中,新生代构造应力场及研究意义

本文通过山门银矿区小型构造的研究，将本区中，新生代构造应力场划分为三期，即侏罗纪，白垩纪，老第三纪构造应力场。最大主压应力方向分别为ＮＷ－ＳＥ向，ＮＮＥ－ＳＳＷ向和ＥＷ向。估算出侏罗纪差应力值１０６．１ＭＰａ，白垩纪差应力值１０．１７Ｍｐａ利用白垩纪构造应力场数学模拟成果，结合物，化探资料，划分出三个成矿远景区。     

Eddy-induced cross-shelf phytoplankton transport along the downwelling coast off Western Australia

Along the downwelling coast off Western Australia, late-autumn/early-winter chlorophyll a blooms are observed on the continental shelf south of Shark Bay (26°S), in contrast with summer blooms in the north. The late-autumn/early-winter blooms are in phase with seasonal strengthening of the Leeuwin Current and its eddy field. Anticyclonic eddies entrain the high phytoplankton biomass waters from the shelf and transport offshore into the oligotrophic, subtropical marine environment, as revealed by coalescing the finite-size Lyapunov exponent (FSLE) of the surface geostrophic flow field and the satellite chlorophyll a images.     

小秦岭(陕西境内)高山河群与小河岩体接触关系及时代探讨

本文对小秦岭（陕西境内）高山河群与小河岩体的接触关系性质,从点到面,从微观到宏观进行了扼要的论述,并明确指出二者非侵入接触,而应是沉积不整合接触,在此基础上探讨了小河岩体的时代。     

湖北省粮食总产预测预报初探

1 前言 湖北省政府及其有关职能部门除需要提前了解当年全省各主要作物产量之外,更关心全年粮食总产的丰歉。因此气象部门开展全年粮食总产预测预报业务与服务具有一定的现实意义,也是气象科技人员多年开展单项作物产量预报业务的一个升华。湖北省地理位置特殊,气候复杂多变,影响粮食作物总产的气象要素多样,再加上境内粮食作物品种较多、分布较广,一旦气候波动或异常,就会引起粮食总产不稳。因此,开展全省全年粮食作物总产预测预报业务与服务有利于政府部门合理制定农业经济计划和进行宏观经济决策。     

对我国油气资源潜力与对策的思考

随着中国经济的高速发展,油气资源的消费量逐年增加,我国现已成为世界上第二位石油消费大国,石油对外依存度高达40%,石油资源储量和生产量很难保证现代化需求.因此,21世纪我国挖掘油气资源潜力的对策是:必须采取大力开发天然气生产业,开拓国际原油市场,分享世界石油资源,扩大老油田的资源与提高能源效率并重的方针.     

鄂尔多斯盆地环县地区长6沉积体系展布特征

岩矿资料表明,鄂尔多斯盆地西部环县地区延长组长6三角洲沉积体系物源来自西部。进一步的地震相研究表明,该三角洲沉积体系在虎洞一带分为两支,一支沿环县-樊家川一线呈东西方向展布,另一支顺洪德方向呈北东向延展,并在耿湾-罗卜塬附近与东北物源体系的安边三角洲交汇。     

A NUMERICAL STUDY OF THE WINTERTIME CIRCULATION IN THE BOHAI AND HUANGHAI SEAS

The paper presents a numerical two-dimensional model (with a realistic sea basin and wind fields as exter nal forcing) to simulate the basic features of the wintertime circulation in the Bohai and Huanghai (Yellow) Seas (BHS) and to show how the circulation can be driven by wind. The main results can be summarized as follows (1) The basic features of the BHS wintertime circulation can be depicted by the wind-driven barotropi'c motion. (2) The traditionally named Huanghai Sea Warm Current (HSWC) is actually generated by the north wind field, at least in winter. (3) The southward coastal current off the Korean west coast plays a more significant role in the southern Huanghai Sea wintertime circulation than traditionally believed. (4) Though the coastal landform and bottom topography play important roles in the wintertime BHS circulation pattern, the wind is a primary forcing.     

TEMPORAL VARIATIONS OF HYDROLOGY AND LIGHT TRANSMISSION AT TWO FIXED OBSERVATION STATIONS IN THE EAST CHINA SEA

ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｒｅｃｏｇｎｉｚｅｄｔｈａｔｔｈｅｒｅａｒｅｔｗｏｉｍｐｏｒｔａｎｔｐｒｏｃｅｓｓｅｓｔｈａｔａｆｆｅｃｔｔｈｅｍａｔｅｒｉａｌｆｌｕｘｅｓｉｎｔｈｅＥａｓｔＣｈｉｎａＳｅａ(ＥＣＳ):ｏｎｅｉｓｔｈｅｍａｔｅｒｉａｌｔｒａｎｓｐｏｒｔｐｒｏｃｅｓｓｅｓｒｅｌａｔｅｄｔｏｔｈｅｆｉｎｅｍａｔｅｒｉａｌ(ｍｏｄｅｒｎ)ｓｅｄｉｍｅｎｔａｔｔｈｅｃｅｎｔｅｒｏｆｔｈｅＥＣＳＣｏｌｄＥｄｄｙ,ａｎｄｔｈｅｏｔｈｅｒｉｓｔｈｅｓｕｓｐｅｎｄｅｄｍａｔｔｅｒ(ＳＭ)ｆｌｕｘｆｒｏｍ…     

VENTILATION OF THE NORTH PACIFIC OCEAN: WATER EXCHANGE BETWEEN SUBTROPICAL AND TROPICAL GYRES

INTRODUCTIONIntheearly 1 980 s,ventilationtheoryemergedtopredictthehorizontalandverticalstructureofthethermocline.Thereweretwodifferentviewsonthestratifiedoceans.Thefirsttheory (RhinesandYoung,1 982 ,hereafterRY ;YoungandRhines,1 982 )proposedanunventilatedmodelinwhichonlytheuppermostlayerisexposedtothesurfaceandisforcedbythewindstress.Thesecondtheory (Luytenetal.,1 983 ,hereafterLPS)offeredaventilatedmodelwhichisclosertotheclassicalthermoclinetheoriesthanthatofthefirstone (e.g .,Nee…