加拿大安大略赫姆洛帕格-威廉斯金矿的地层、断裂和金矿的关系

导论金矿出现在加拿大地盾的许多绿岩带中,具有多种地质环境并可被划分成许多矿床类型,包括最近在赫姆洛发现的类型。研究者对金矿的生成是受地层和构造控制已开展争论。赫姆洛的威廉斯矿区的帕格-威廉斯金矿包括A、B、C三带。三个地貌上各异的金矿,均赋存在独特的断层控制的地层层序中,其规模、岩石、构造、丰度、含金的     

加拿大安大略州阿比提比绿岩带地质发展中金矿层形成的位置

安大略阿比提比(Abitibi)绿岩带火山岩的均匀(除花岗质岩石附近外)低级变质作用和巨大地层视厚度(～40公里),被解释是铲状正断裂的结果。紧接着断裂之后发生从拉斑质到钙碱质最后到钙碱性科马提质的火山旋回。地壳的断裂发生在花岗质岩石侵位的初期,在张应力作用下形成。这类花岗质岩基与钙碱性火山岩同源。在火山喷     

西澳大利亚地盾太古宙金矿床的成因和构造控制——变质交代模式

金矿床广泛出露在世界各地的绿岩带中,而太古宇岩区是主要产金岩区。象其他克拉通一样,西澳大利亚太古宙金矿化具代表矿床类型的复杂组合。尽管如此,大部分矿床明显是后生成因的,大型矿床具许多共同的特征,包括强烈控制,明显的围岩蚀变(硫化铁、钾云母±钠长石,Ca-Mg-Fe型碳酸盐),稳定的金属组合(Au-Ag-As-     

燕山地区大红峪组火山岩古风化作用新认识

大红峪组火山岩，在成岩后受古风化作用影响引起化学成分的变化，特别是深风化带岩石后期K2O沉积的影响，造成从未风化到深风化 TAS图解，碱度系数，岩系指数及岩石类型等方面相应地发生变化，在TAS图解上，岩石向碱性增加，SiO2减少方向变化，碱度系数变在，岩系指数的变化使火山岩反映为从钙碱性到超碱性，岩石类型也出现不确定性，深化带岩石根据民分计算标准矿物时，出现白榴石，霞石等碱性矿物，而实际矿未见这一现象，也是后期K2O沉积影响的结果。排除古风化的影响，作者认为大红峪组火岩应力钾质的粗而岩和粗面玄武岩，属钙碱系列，粗面玄武岩为铝过饱和型，粗面岩为正常型。不存在明显的岩浆分离晶作用，其原始岩浆应以基性为主。同上述的原因，影响了对岩浆来源，构造环境的判断，推断其构造环境，是在总的海进条件下，出现多次的海退，伴有多次火山喷发活动，水动能比较大，气候干旱，封闭，半封闭闭的海盆中富含钾的环境。     

Spatial-temporal Characteristics of Land Use Intensity of Coastal Zone in China During 2000–2010

Based on remote sensing and GIS techniques, land use maps in 2000, 2005 and 2010 in China′s coastal zone were produced, and structural raster data of land use were further generated to calculate land use intensity comprehensive index(LUICI) for analyzing land use spatial-temporal characteristics at 1 km scale. Results show that: 1) from the perspective of spatial patterns of landforms at a macro scale, there is a significant difference in land use intensity between the north and the south of China′s coastal zone. Hotspots of changes mainly concentrated in metropolitan areas, estuaries and coastal wetlands; 2) elevation is an important factor that controlling land use spatial patterns at local scale. Land use intensity is much higher within areas below the elevation of 400 m and it decreased significantly as the elevation increasing; 3) there is a significant land-ocean gradient for land use intensity, which is low in island and near-shore areas, but high in the regions that 4–30 km far away the coastline because of much intensive human activities; however, in recent decades land use intensity had been promoted significantly in low near-shore area due to extensive sea reclamations; 4) significant differences of land use intensity were also found among provincial administrative units. A rising trend of land use intensity was found in provincial-level administrative units from 2000 to 2010. To sum up, elevation, land-ocean gradient, socio-economic status and policy are all influencing factors to the spatial patterns and temporal variations of land use intensity in China′s coastal zone.     

Carrying Capacity of Marine Region in Liaoning Province

Carrying capacity is one of important studies on coordinating development of population,resources,and environment.At present,the researches on it mainly concentrate on the carrying capacity for population and economy,such as the water resources carrying capacity,the land resources carrying capacity,the environment carrying capacity,etc.Based on the related theories and methods,this paper creatively proposed the concept and meaning of carrying capacity of marine region,and formed the appraisal system.According to the developing situation of marine economy of Liaoning Province in recent years,and by employing the method of the state space,this paper also measured the carrying capacity and carrying state of marine region and discussed the sustainable problems of marine economy of Liaoning.The research results show that the carrying state of marine region of Liaoning is in the state of overloading at present,but taking a favorable turn.     

The Palaeoclimate and Microscopic Reservoir Characteristics of Shanxi Formation Shales from Lower Permian in Qinshui Basin

<正>1 Introduction Qinshui Basin is the major coal bearing basin in China.And the main exploration target layer is CarboniferousPermian.In recent years,not only in the coal-bed methane has made great progress,and also in the tight gas.Besides,shale gas in the Carboniferous-Permian has showed a good exploration prospect.Although Carboniferous-