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421.
Chronology of the high-pressure metamorphism of Norwegian garnet peridotites/pyroxenites 总被引:8,自引:0,他引:8
Eclogite facies mineral assemblages are variably preserved in mafic and ultramafic rocks within the Western Gneiss Region (WGR) of Norway. Mineralogical and microstructural data indicate that some Mg–Cr-rich, Alpine-type peridotites have had a complex metamorphic history. The metamorphic evolution of these rocks has been described in terms of a seven-stage evolutionary model; each stage is characterized by a specific mineral assemblage. Stages II and III both comprise garnet-bearing mineral assemblages. Garnet-bearing assemblages are also present in Fe–Ti-rich peridotites which commonly occur as layers in mafic complexes. Sm–Nd isotopic results are reported for mineral and whole rock samples from both of these types of peridotites and related rocks. The partitioning of Sm and Nd between coexisting garnet and clinopyroxene is used to assess chemical equilibrium. One sample of Mg–Cr-type peridotite shows non-disturbed partitioning of Sm and Nd between Stage II garnet and clinopyroxene pairs and yields a garnet–clinopyroxene–whole-rock date of 1703 ± 29 Ma (I= 0.51069, MSWD = 0.04). This is the best estimate for the age of the Stage II high-P assemblage. Other Stage II garnet–clinopyroxene pairs reflect later disturbance of the Sm–Nd system and yield dates in the range 1303 to 1040 Ma. These dates may not have any geological significance. Stage III garnet–clinopyroxene pairs typically have equilibrated Sm–Nd partitioning and two samples yield dates of 437 ± 58 and 511 ± 18 Ma. This suggests that equilibration of the Stage III high-P assemblage is related to the Caledonian orogeny and is more or less contemporaneous with high-P metamorphism of ‘country-rock’eclogites in the surrounding gneisses. The Sm–Nd mineral data for the Fe–Ti-rich garnet peridotites and for a superferrian eclogite, which occurs as a dyke within the Gurskebotn Mg–Cr-type peridotite, are consistent with a Palaeozoic high-P metamorphism. Finally a synoptic P–T–t path is proposed for the Mg–Cr-type peridotites which is consistent with the petrological and geochronological data. 相似文献
422.
423.
北京城郊近地层湍流实验观测 总被引:13,自引:2,他引:13
本文利用两台FA-11超声风速温度仪于1992年3月到4月间在北京325 m气象观测塔47 m和120 m两个高度观测到的风速三个正交分量以及声虚温的湍流脉动资料,计算和分析了北京城郊粗糙下垫面近地层湍流特征量及其日变化,无量纲垂直速度和声虚温的方差随稳定度的变化,风速分量和温度的归一化湍流能谱以及动量和热通量的互谱及其随稳定度的变化。并且与平坦均一下垫面近地层湍流观测的结果进行了对比。 相似文献
424.
1993年北半球环流特征及其对我国天气气候的影响 总被引:4,自引:0,他引:4
1993年北半球主要环流特征表现为:500hPa副产持续加强西伸,位置偏南;亚洲中纬度春,夏经向环流发展,东亚太平洋遥相关型稳定;西藏高原500hPa位势高度持续偏高,印缅槽持续偏弱;100hPa位势高度场低纬持续偏高,中,高纬持续偏低,夏季南亚高压位置异常偏高。热带海洋出现明显异常,一次新的厄尔尼诺现象发生。热带海洋和北半球大气环流的异常对我国天气气候产生明显影响。 相似文献
425.
苏鲁交界及南黄海地区地震波速比的变化特征 总被引:2,自引:0,他引:2
本文主要应用多台波速比和单台波速比的方法,计算了苏鲁交界及南黄海(北纬35°35′至36°00′,东经117°00′至121°00′)范围内,1984到1991年7月发生在该区域的163次ML≥1.7地震的波速比值,并对波速比结果进行t检验和模糊数学分析识别。分析结果发现,1985年1月至11月出现了不连续的波速比低值异常时段,模糊数学识别的异常从属函数在这段时间也呈现高值。异常恢复后,1987年 相似文献
426.
B. F. Windley A. Razafiniparany T. Razakamanana D. Ackermand 《International Journal of Earth Sciences》1994,83(3):642-659
The Precambrian of Madagascar is divided into two sectors by the north-west trending sinistral Ranotsara shear zone, which continues in the Mozambique belt, probably as the Surma shear zone, and in Southern India as the Achankovil shear zone. South of Ranotsara six north-south trending tectonic belts are recognized that consist largely of granulite and high amphibolite facies paragneisses, phlogopite diopsidites, concordant granites and granulites. North of Ranotsara the central-northern segment is traversed by a north-trending axial 100–150 km wide dextral shear zone of probable Pan-African age, which was metamorphosed under granulite and high amphibolite facies conditions and which has reworked older basement. This shear zone continues across southern India as the Palghat-Cauvery shear zone. Major stratiform basic -ultrabasic complexes occur in the axial zone and in the basement to the west. Well preserved low grade continental margin-type sediments (quartzites, mica schists and stromatolitic marbles) of Kibaran age are present in western Madagascar. Two partly greenschist grade sedimentary groups lie unconformably on high grade basement in north-east Madagascar. Isotopic age data suggest the presence in Madagascar of Archaean, Early and Mid-Proterozoic crustal material that was extensively reworked in Pan-African times. 相似文献
427.
A numerical simulation of gas flow during coal/gas outbursts 总被引:2,自引:0,他引:2
Summary A model of the gas flow in airways during an instantaneous outburst of coal and gas is formulated and solved numerically using MacCormack's explicit finite-difference scheme. This model is based on the assumption that geological structures, in-situ stresses and high-gas-pressure gradients play important roles in initiating an outburst, with the gas content and gas-pressure gradients being the most dominant factors. The fluid-dynamic processes that occur after an outburst are computed by the numerical integration of the complete time-dependent Navier-Stokes equations. The mixture velocity, the density and the gas-concentration profiles in both time and space domains (immediately after an outburst) are presented. The global results are useful in gaining an improved understanding of gas-flow patterns during coal/gas outbursts and in determining the range of the disturbance so that effective methods of control can be developed.Nomenclature
a
speed of sound
-
C
gas concentration (mass)
-
C
v
specific heat at constant volume
-
C
p
specific heat at constant pressure
- CFL
Courant-Friedrichs-Lewy number
-
E
total energy of the mixture
-
F
the vector defined in Equation 27
-
G
the vector defined in Equation 28
-
h
entropy
-
h
i
entropy at inlet
-
J
xi
diffusion flux in the i-direction
-
k
thermal conductivity of a gas
-
M
Mach number
-
P
pressure of a mixture (the partial pressure of gas)
-
P
gas pressure
-
P
a
atmospheric pressure 相似文献
428.
429.
山西中强地震前波速比异常研究 总被引:1,自引:0,他引:1
本文分析了大同-阳高6.1级(1989),5.8级(1991),忻州5.、1级(1991),侯马5.1级(1989)以及太原,运城1989-1991年几个4.0级左右地震前后的202次小震资料。结果表明:这些主震前都存在明显的地震波速异常变化,纵横波速比Vp/Vs表面为下降-回升的异常形态,负异常持续时间与震级大小相关;主震在岁异常结束后发生,滞后时间随区域地震震源深度增大而延长。同时,主震前还存 相似文献
430.
处于高纬向日面的极隙区是太阳风能量、动量和质量可以直接进入地球磁场并到达地球的近地空间的区域。本文简要介绍了极隙区的观测和研究,综述了极隙区的粒子沉降、场向电流、等离子体对流和电离层电流的特征。 相似文献