Garnet-bearing Granulite Facies Rock Xenoliths from Late Mesozoic Volcaniclastic Breccia, Xinyang, Henan Province

This paper presents the primary results of petrologic, mineralogical and petrochemical studies of garnet-bearing granulite facies rock xenoliths from Xinyang, Henan Province. These xenoliths, which are found in a pipe of late Mesozoic volcaniclastic breccia, are of high density (3.13-3.30 g/cm3) and high seismic velocity (Vp = 7.04-7.31 km/s), being products of underplating of basaltic magmas and had experienced granulite facies metamorphism. The underplating and metamorphism took place before the eruption of the host rock. Petrographical studies and equilibrium T-P calculations show that these xenoliths were captured at a 49 km depth and experienced at least a 16 km uplift before they were captured. The dynamics of the uplift could be related to the continent-continent collision between the North China plate and the Yangtze plate during the Triassic.     

滇西泥盆纪——三叠纪盆—山转换过程与特提斯构造演化

滇西地区以昌宁－连缝合带为古特提斯主洋闭合的位置。晚古生代－中生代时期古特提斯经历了一次盆转山和山控盆演变序列的全过程，可大致划分为4个发展阶段：（1）洋盆扩张阶段（D－C2）。古特提斯洋西侧的保山地块属冈瓦纳古陆的东缘，为非火山型被动大陆边缘；东侧的思茅地块属扬子地块的西缘部分，为火山型被动大陆边缘。（2）洋－陆汇阶段（C3－P2）。昌宁－孟连洋向东俯冲消减，思茅地区转化为弧后扩张盆地；墨江一带形成弧后扩张洋盆，思茅地块从扬子西缘分离。（3）弧－陆碰撞阶段（T1－T3），古特提斯主洋及分支洋盆相继关闭，全区发生大规模的造山升隆，前期的盆转山过程转入山控盆阶段，在哀牢山两侧分别形成了受造山作用控制的兰坪－思茅弧后前陆盆地和楚雄周缘前陆盆地。（4）陆－陆碰撞阶段（J1－K），滇西前陆盆地向陆内拗陷盆地转变，造山带的控盆作用结束。     

阴山地区印支期碱性侵入岩岩石地球化学特征

通过系统的矿物学、岩石学、地球化学研究，确立了阴山地区印支期碱性岩在空间上分为南北两条近东西走向的岩带。南带以霓辉正长岩为主，北带以碱性正长岩为主。南北两带岩体均富集轻稀土元素、大离子亲石元素和高场强元素，而Cr、Ni等相容元素含量很低。结合Nd、Sr、Pb同位素特征，认为该地区印支期碱性岩源自富集地幔，并受到不同程度的地壳物质混染。     

断裂带热释光的初步研究

本文对湖南水口山矿田断裂带岩石进行了热释光分析,断裂作用可对岩石的热释光特征产生显著变化。断裂带岩石天然热释光不存在250℃以下的低温峰;从围岩到断裂带中心,热释光峰值大幅度增加;同一断裂带从地表向深部热释光峰值增加。碎裂断裂带天然热释光峰值为10~3—10~4级,高峰温度位于290—310℃范围内;硅化断裂带的天然热释光峰值大多为10~2—10~3级,高峰温度多在330—350℃范围内。     

文峪金矿元素地球化学统计分析及深部预测研究

文峪金矿是著名的小秦岭金矿成矿带中的重要矿床，位于河南省与陕西省交界处，本文通过系统的地球化学元素样品分析，采用数学地质统计分析方法，确定了成矿元素间的亲缘关系的组合规律，建立了该矿床成矿元素分带序列模型，指出文峪金矿深部具有良好的找矿远景。     

斜轴等角切圆柱投影

“斜轴等角切圆柱投影”是最适合于作为编制长距离航行图的数学基础。总的性能简单地说就是斜麦卡脱等角切圆柱投影,因而在主航线上的变形等于零,而距主航线三百公里的范围以内,投影引起的变形对于飞行基本上是没有影响。自从苏联设计出“图104”、“图110”长距离飞行的飞机后,编制长距离的航行图更为需要。本文的目的就为编制这种地图的投影提供一个参考意见。     

Horizontal and vertical distribution of PCBs and chlorinated pesticides in sediments from Masan Bay,Korea

Horizontal and vertical distributions of organochlorine compounds (OCs) were determined in sediments from Masan Bay. The concentrations of polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethanes (DDTs), HCB, hexachlorocyclohexanes (HCHs) and chlordane related compounds (CHLs) in sediments were in the range of 1.24-41.4, 0.28-89.2, 0.02-0.59, nd-1.03, and nd-2.56 ng/g, respectively. The spatial distribution of OCs showed a negative gradient from the inner of the bay to outer part of the bay, indicating that the source of OCs was probably located inside the bay. Compositional pattern of PCB congeners showed a relatively high concentration of high-chlorinated congeners in the inner part of the bay and a relatively low concentration of low-chlorinated congeners in the outer part. In sediment core from Masan Bay maximum concentrations of PCBs and DDTs are observed in the subsurface samples and correspond to an age of early 1980s and late 1960s. The concentration profiles of PCBs and DDTs in sediments of Masan Bay appear to correspond to use of PCBs and DDTs in Korea.     

Spacial organization on the rural settlements in plain areas—taking Pinghu city in Zhejiang of China as an example

1 Spacial Organization Optimizing Theory 1.1 The centeral place theoryThe "centeral place theory" hypothesizes that there is a region: (1) the region is a uniform plain; (2) the motion of economic activities in regions can be carried through in every directions forever; (3) the purchasing power of residents is a successive and uniform distribution; (4) the movement of consumers has rationality in space, namely, proceeding by the shortest distance. The rural settlements as the central place of…