内蒙古哈达庙含金侵入杂岩体稀土元素地球化学研究

本文利用哈达庙含金侵入杂岩体各主要岩石类型REE分析数据,结合野外地质产状和地球化学特征,论证了杂岩体REE贫化、富集规律与成岩岩浆结晶演化的关系.在此基础上,提出了成岩过程早期以矿物结晶分异作用为主,而晚期阶段受热重扩散效应制约的成岩模式,二种分异作用的交替进行为金矿床的形成提供了物质基础.同非金斑岩体热液蚀变岩相比,含金斑岩体的热液蚀变岩以LREE丰度明显增高为特征,其独特的分布型式和组成特点可作为该区斑岩体含金性评价的地球化学标志之一.     

南天山西段地震尾波Q值研究

基于新疆地震台网的数字地震波形资料,采用Aki的地震尾波单次散射模型,选取了南天山西段10个台站周围60km范围内M_S≥2.0的397次地震事件计算并得到了不同台站的尾波Qc值。结果显示,南天山西段尾波Q_0值平均值在140~390之间,其中喀什台和乌恰台Q_0值最低;频率相关系数η的平均值在0.62~1.00之间,拟合平均Q值与对应频率之间的关系结果为Q=261.2±110.8f~(0.80±0.28),表明该地区是以低Q_0高η值为特征的构造活跃区。     

河北承德大庙地区元古代的晚期辉长—苏长岩的岩石特征及其成因

河北承德的大庙斜长岩杂岩体是我国著名的岩体型斜长岩杂岩体,其苏长岩可分为两种类型,即早期苏长岩和晚期辉长—苏长岩。早期苏长岩已发生钠长绿帘角闪岩相变质;晚期辉长—苏长岩变质程度较弱,含有斜长石、斜方辉石和单斜辉石巨晶,主要呈岩墙、岩脉或小岩体侵入于斜长岩杂岩体中,与铁磷矿紧密相关。研究表明：晚期辉长—苏长岩主要由中性斜长石、反条纹长石、单斜辉石、斜方辉石、黑云母、磷灰石、钛磁铁矿和磁铁矿等组成,依矿物含量、成分和结构的差异可分为淡色辉长岩、单斜辉石苏长岩、斜方辉石辉长岩以及含铁磷矿对应岩石。其Ba、Sr和轻稀土富集、Eu弱负异常或无异常特征,表明晚期辉长—苏长岩岩浆不是形成斜长岩的基性岩浆,而是经斜长石分离结晶后的残余岩浆。Sr-Nd-Pb同位素地球化学特征显示晚期辉长—苏长岩可能源自EMI富集的岩石圈地幔,与岩体型斜长岩不存在同源岩浆分离结晶演化的关系。大庙地区晚期辉长—苏长岩的岩浆来源、演化和构造控制的特征对深化研究岩体型斜长岩杂岩体的成因有重要意义。     

Unsteady inter-porosity flow modeling for a multiple media reservoir

The paper deals with unsteady inter-porosity flow modeling of underground fluid in a multiple media reservoir. Assuming spherical vugs, symmetrically distributed pressure, negligible inter-porosity flow between matrix and vug systems and centrifugal flow of the fluid from matrix blocks or vugs to fractures, and treating media directly connected with wellbore as the fracture system, we establish and solve a model of unsteady inter-porosity flow for dual and triple porosity media reservoirs. We provide simulated graphs of pressure and pressure derivative log-log type curves, and analyze the transient flow process and characteristics of type curves affected by different parameters. The new type curves of unsteady inter-porosity flow modeling are evidently different in shape and characteristics from those of pseudo-steady inter-porosity flow modeling. The location of dimensionless pressure of unsteady inter-porosity is lower than that of pseudo-steady inter-porosity, which indicates that unsteady inter-porosity flow accelerates an energy supplement during production. Qualitatively, the unsteady inter-porosity flow modeling reduces the classical V-shaped response. We also estimated parameters from well test data in real applications using this model.     

双频电磁波电导率层析成象

本文论述双频透射电磁波电导率层析成象方法。设｜Ｅ１｜，｜Ｅ２｜为在远场区观测的同一电偶极天线的两个辐射电场强度。如地质介质的电导率连续变化，观测场强的辐射频率ω１，ω２之差较小，则有如下的电导率层析成象方程｜Ｅ１｜－｜Ｅ２｜＝２０ｌｏｇ（ω１／ω２）＋２０ｌｏｇ（ｅ）μ／２（ω２－ω１）∫σ～（ｒ）ｄｒ式中σ＾＝σ，σ为介质的电导率。双频透射电磁波电导率层析成象方法克服了长期困扰电磁波吸收层析成象的初始辐射场强计算问题，应用实例表明它可获得更精确的层析图。     

青藏高原东北缘地质构造背景及地壳结构研究

利用地质和人工地震测深剖面资料,研究了青藏高原东北缘的地质构造背景、地壳结构和莫霍面形态．主要结果是：① 给出了青藏高原东北缘的大地构造分区和主要深大断裂的特征;② 主要利用人工地震测深资料得到莫霍面的基本特征;③ 地表断裂与莫霍面的某些特征有较好的对应关系,这种复杂的地壳结构可能是强烈地震的孕育环境．     

Pelagic records from the Equatorial Ninetyeast Ridge and significant environmental events during the past 3.5 Ma

This paper presents pelagic records of planktic foraminifera, as well as data of stable isotope stratigraphy and carbonate stratigraphy since 3.5 Ma B.P. from site ODP758 in the Ninetyeast Ridge of the Indian Ocean. Based on these data, manifestations and related mechanisms of major tectonic and environmental events such as the rapid uplift of the Himalaya Mountains, “middle Pleistocene climatic transition” and “mid-Brunhes dissolution event” in the region are discussed. According to the analysis and comparison of various indices and changes in terms of foraminifera assemblage, paleotemperature, paleosalinity and themocline from site ODP758, the authors deduce that the paleoclimatic changes might correlate with the mid-Pleistocene transition at 1.4–1.7 Ma B.P. The changes of CaCO₃, mass accumulation rates (MAR) of CaCO₃ and non- CaCO₃ MAR indicate that the loaded terrigenous sediments increased at 1.7 Ma, which is in agreement with the uplift history of the Qinghai-Tibet plateau as shown by the available data. The last two changes coincide with the uplift of the Qinghai-Tibet plateau, hence they are called “Qinghai-Tibet movement” (1.7 Ma), and the “Kunlun-Yellow River movement” (1.2–0.6 Ma). The changes of the CaCO₃ content, coarse fraction (> 150 μm) content and planktonic foraminifera biostratigraphy show that strong dissolution of abyssal CaCO₃ occurred in the study region during 0.5–0.4 Ma. The event was consistent with the “mid-Brunhes dissolution event” in the sedimentary records of the Atlantic Ocean, Pacific Ocean, Indian Ocean and Nansha sea area of the South China Sea. __________ Translated from Geological Bulletin of China, 2007, 26(12): 1627–1632 [译自: 地质通报]     

Trends in northern midlatitude atmospheric wave power from 1950 to 2099

In a warming climate, atmospheric wave activity and associated weather patterns may change, although conflicting results have been reported on this topic. Additionally, atmospheric wave changes in a future climate have mainly focused on waves of a specified spatial scale, rather than a particular spatiotemporal scale. Here, changes in the variability of Rossby waves of multiple spatiotemporal scales are analyzed using the wavenumber-frequency power spectrum, a tool commonly applied to analyze atmospheric equatorial waves. Daily 500 hPa geopotential height data over 40°–60°N from historical (1950–2005) and future (2006–2099) simulations from 20 models in the Coupled Model Intercomparison Project Phase 5 (CMIP5) under the RCP8.5 scenario were analyzed. When compared to the historical period, the late 21st century climate projections showed a decline in spectral power for both eastward and westward propagating waves with wavenumbers greater than 8 that spanned over all frequencies in all seasons, but an increase in mean power for eastward propagating waves with wavenumbers 1–7 over all frequencies was shown in winter and spring. This increase in power was accompanied by increased variance, i.e., an increased meridional extent of 500 hPa ridges and troughs, and was the result of increases in the mean number of high amplitude events and duration of activity within this wave band. These results indicate that large-scale (~ 104 km) eastward propagating weather systems may intensify with higher amplitudes for ridges and troughs, while short-scale (102–103 km) weather systems may decrease in their intensity due to reduced variability in the late 21st century under the high emissions scenario. Potential mechanisms for these changes are discussed, including enhanced Arctic warming and midlatitude-tropical interactions.     

PWD22型能见度计的使用与维护

介绍能见度的自动观测技术,并通过介绍PWD22型能见度计,阐述能见度计的原理、种类和安装使用方法以及注意事项。     

南澳风电场雷灾特点及原因分析

对南澳风电场1996～2010年的雷灾实例进行了统计分析,找出影响雷电防护水平不一的主客观因素;得出雷灾特点:雷灾事故集中发生在每年的4～9月,按照受损坏的位置划分,风电场的各个部分都可能因雷击遭受损坏,其中监控系统是受损几率最高的部分,其次是叶片和箱式变压器.