Ordovician Intrusive-related Gold-Copper Mineralization in West-Central New South Wales, Australia

Three major types of Ordovician intrusive-related gold-copper deposits are recognized in central-west New South Wales, Australia: porphyry, skarn and high sulphidation epithermal deposits. These deposits are mainly distributed within two Ordovician volcano-intrusive belts of the Lachlan Fold Belt: the Orange-Wellington Belt and the Parkes-Narromine Belt. Available isotopic age data suggest that mineralization of the three types of deposits is essentially coeval with the Ordovician intrusive rocks (480-430 Ma).Porphyry gold-copper deposits can be further divided into two groups. The first group is associated with monzonite showing shoshonitic features, represented by Cadia and Goonumbla. The second group is associated with diorite and dacite, including the Copper Hill and Cargo gold-copper deposits. Gold skarn is associated with Late Ordovician (430-439 Ma) monzonitic intrusive complexes in the Junction Reefs area (Sheahan-Grants, Frenchmans, and Cor-nishmens), Endeavour 6, 7 and 44, Big and Little Cadia     

焉耆盆地侏罗系低渗透储层敏感性评价

焉耆盆地侏罗系具近物源沉积特点,储层成分成熟度和结构成熟度均较低,粘土矿物含量高,物性较差,属低渗透储层。“五敏”实验结果表明,储层均表现为强水敏特征,物性相对较好的储层还表现出强盐敏和中等偏弱速敏、碱敏等敏感性特征,盐酸对储层具有一定程度的改善,并进一步探讨钻探施工过程中油层保护的措施及应用效果。     

周口店多足类化石

1932—1937年间在周口店中国猿人产地及其他地点采得八十馀件节足动物化石,多破碎,完整者极少。颜色不一,由乳白而棕黄,兼有呈半透明玻璃状者。经初步观察,应属节足动物门,多足纲,倍脚目,马陆科,计一属两种: 一、山马陆(Julus of.terrestris)此种在第一,三,十五地点及山顶洞均有发现。此与现生的山马陆无甚差异,仅肛板及由二肛板所成之肛门沟稍大。二、裴氏小马陆(Julus peii Chia & Liu(sp.nov.)此种於第一,四,十五地点及山顶洞均有发现。由身体及头部形态,身体环节数目(三十个以上),知其与山马陆同属。但其决非幼小山马陆,因其体节数目多於长成之山马陆。但与现生於日本的一种 Nipponoiulus truncatus 近似,惟後者体节数较少,尾端钝圆。关於马陆属化石,据现在所知最早发现於始新统地层中,直到现在仍有生存,变异极小。以上所述二种若非与其他脊椎动物化石共生於周口店地点,则其年代颇难鉴定,因其有以後爬入岩隙死後石化之可能,不过上述之标本不但有共生脊椎动物为证,且有的已埋藏於固结的砾岩中,其属於更新统时期可无疑义。     

A Computational Model for Velocity Separation in Shallow Sea

Based on the hydrodynamical feature and the theoretical velocity profiles of tidal flow and vvind-induced flow in shal-low sea, a computational model is established for the first time, which can separate observed velocity into tidal velocity and wind-induced velocity by use of the least square method. With the model, not only the surface velocities of tidal flow and vvind-induced flow are obtained, but also the bed roughness height is determined and the wind velocity above the wa-ter surface is estimated. For verification of the model, the observed velocity in the Yellow River Estuary and the laborato-ry test is separated, then it is applied to the Yangtze River Estuary. All the results are satisfactory. The research results show that the model is simple in method, feasible in process and reasonable in result. The model is a valid approach to analysis and computation of field dala, and can be applied to separate the observed velocity in shallow sea; at the same time, reasonable boundary conditions of th     

Discovery of A-type Granite Zone and Its Geodynamic Significance in the Western Kunlun Mts., China

l. IntroductionGranite distributes widely in western KunlunMts. Many researches have been conducted byscientists (Wang Yuzhen et.al., l987; Zhang Yuquanet.al., l989, Fang Xilian et.al., I990, Jiang Chunfaet.al., 1992; Pan Yusheng, l992, Xu Ronghua et.al.,l 994; Jing Daogui et.al., l996, Zhang Yuquan et.al.,l998). But all of the researches have been donealong Sino-Pakistan road and Xinjiang-Tibet roadtith fOcus on isotopic dating of the intrusion andconducted a few on origin and tect…     

江苏煤层气资源分析

简要地归纳了江苏省煤层气的成矿地质环境，分析了成煤区地质构造特征、煤层及围岩储层的物性特征，在此基础上，对主要地区煤层气资源进行了估算。     

介质横向不均匀对震后地表位移场的影响

利用三维有限元模拟两层地球模型(包括弹性层和粘弹性层)介质的横向不均匀和断层错动的复杂性对震后地表位移场的影响,其数值结果包括弹性解和粘弹性解。结果表明,震后位移场的分布特征不仅与粘弹性层的流变特性有关,还与弹性层介质的剪切模量以及断层的同震错动有关。     

ARTIFICIAL NEURAL NETWORK CORRECTION OF ROUGH ERRORS OF OBSERVATIONS

In the context of tower measured radiation datasets.following the correction principle meetinga diagnostic equation in data quality control and in terms of a technique for model construction ondata and ANN(artificial neural network)retrieval for BP correction of radiation measurementswith rough errors available,a BP model is presented.Evidence suggests that the developed modelworks well and is superior to a convenient multivariate linear regression model,indicating its wideapplications.     

流体包裹体方法在油气源追踪对比中的应用——以四川盆地碳酸盐岩大型气田为例

本文运用流体包裹体方法，基于薄片观察和岩矿学研究，探讨了四川盆地碳酸盐岩大型气田的气源。首先对包裹体的生源属性、多期捕获和后生变化进行了精细的鉴别分析。在此基础上，通过成岩自生矿物微量元素、包裹体相组成、均一温度、初熔温度等参数鉴别多期演化的油气充注。通过烃类包裹体化学成分初步鉴别出煤成气和油型气。根据烃类包裹体的相组成鉴别有机质可能来源于腐泥型源岩还是腐殖型源岩。最后根据同期包裹体生物标志物确定某一期次的油气所对应的烃源层。结果表明研究成果符合地质实际，为传统的油气源追踪对比研究提供了一个重要有效的辅助方法。     

区域人地系统的优化调控与可持续发展

区域人地系统的优化调控始终是现代地理学的重要任务,也是市场经济条件下中国实施可持续发展战略的理论基石。文章认为,区域人地系统优化调控的对象结构应从PRED系统改进为P_DR_DE_DE_DE_DS_D系统,人地系统优化调控的切入点与重点应坚持“以人为本”,而调控的重中之重应是人的意识建设,优化调控的目标点是追求和谐发展至上的目标。人地系统优化调控的动态机理在于模拟“人圈”与“地圈”的最佳距离,优化调控的空间结构包括核心区、发生区、支持区和作用区,各功能区相互竞争的结果形成区域定位与空间共生。协调优化和调控区域人地系统,不仅包括人地系统各要素之间以及各要素内部发展的动态协调与优化,而且包括区域之间人地系统的空间协调和优化,只有同时实现了区域之间人地系统的产业组织协调和空间组织协调,消除了区域盲目竞争与区域冲突,才能实现人地系统经济社会行为对空间区位的合理占据,才能真正实现区域之间的协调发展和空间共生。