含铁闪锌矿热容的实验测定与分析   总被引：1，自引：0，他引：1  

陶鲜  谭大芳 《地质科技情报》1998,17(4):77-80

利用美国ＤｕＰｏｎｔ公司的９９００型差示扫描量热仪对３个含铁闪锌矿样品的热容进行了实验测定,并讨论了定压摩尔热容实验值与实验温度的关系。实验结果表明,在实验条件下,含铁闪锌矿的定压摩尔热容与纯闪锌矿的定压摩尔热容存在显著差异,Ｆｅ置换Ｚｎ是造成这种差异的主要原因。  相似文献   

粘土矿物研究在塔里木盆地石油勘探中的应用   总被引：2，自引：1，他引：1  

孙玉善  杨帆 《现代地质》1998,12(2):269-276

以塔里木盆地粘土矿物的分布特征及其组合形式、演化与形成机理为依据,探讨了粘土矿物在地层划分对比中的应用及其与有机质热演化、成岩阶段的关系和对储层物性的影响。研究表明,在侏罗系和白垩系两个不同古环境中形成的粘土矿物及其组合特征,为地层对比提供了一定的证据。泥岩中伊利石／蒙皂石间层中蒙皂石含量的纵向变化与有机质热演化及成岩阶段的关系不大。对储层物性影响不大但有利于储集性能的是以高岭石为主的粘土矿物组合类型及粘土矿物的早期自生（伊利石／蒙皂石间层矿物）衬垫式以及非自生（伊利石）衬垫式产状。  相似文献   

The magma evolution of Tianchi volcano, Changbaishan   总被引：4，自引：0，他引：4  

Ruoxin Liu  Qicheng Fan  Xiangshen Zheng  Ming Zhang  Ni Li 《中国科学D辑(英文版)》1998,41(4):382-389

The Changbaishan Tianchi volcano is composed of the basaltic rocks at the shield-forming stage, the trachyte and pantellerite at the cone-forming stage and modern eruption. Studies on their REE, incompatible elements and Sr, Nd, Pb isotopes suggest that rocks at different stages have a common magma genesis and close evolution relationship with differentiation crystallization playing the key role. The co-eruption of basaltic trachyandesite magma and pantellerite magma indicates that there exist both crustal magma chamber and mantle magma reservoir beneath the Tianchi volcano. Project supported by the National Natural Science Foundation of China (Grant No. 49672109).  相似文献   

K–Ar ages of the basaltic rocks from Far East Russia: Constraints on the tectono-magmatism associated with the Japan Sea opening     

Satoshi Okamura  Yuri A. Martynov  Katsuhiko Furuyama  & Keisuke Nagao 《Island Arc》1998,7(1-2):271-282

K–Ar ages of the Cenozoic basaltic rocks from the Far East region of Russia (comprising Sikhote-Alin and Sakhalin) are determined to obtain constraints on the tectono-magmatic evolution of the Eurasian margin by comparison with the Japanese Islands, Northeast China, and the formation of the back-arc basin. In the early Tertiary stage (54–26 Ma), the northwestward subduction of the Pacific Plate produced the active continental margin volcanism of Sikhote-Alin and Sakhalin, whereas the rift-type volcanism of Northeast China, inland part of the continent began to develop under a northeast–southwest-trending deep fault system. In the early Neogene (24–17 Ma), a large number of subduction-related volcanic rocks were erupted in connection with the Japan Sea opening. After an inactive interval of the volcanism ∼ 20–13 Ma ago, the late Neogene (12–5 Ma) volcanism of Sikhote-Alin and Sakhalin became distinct from those of the preceding stages and indicated within-plate geochemical features similar to those of Northeast China, in contrast to the Japan Arc which produces island arc volcanism. During the Japan Sea opening, the northeastern Eurasian margin detached and became a continental island arc system, and an integral part of continental eastern Asia comprising Sikhote-Alin, Sakhalin and Northeast China, and the Japan Arc with a back-arc basin. The convergence between the Eurasian Plate, the Pacific Plate and the Indian Plate may have contributed to the Cenozoic tectono-magmatism of the northeastern Eurasian continent.  相似文献   

Thermoelastic stress due to a rectangular heat source in a semi-infinite medium. Presentation of an analytical solution     

Johan Claesson  Thomas Probert   《Engineering Geology》1998,49(3-4):223-229

The thermoelastic response due to a time-dependent rectangular heat source in a semi-infinite medium is analyzed. The problem originates from studies of nuclear waste repositories in rock. Canisters containing heat-emitting nuclear waste are deposited over a large rectangular area deep below the ground surface. The solution for a time-dependent heat source is obtained from the corresponding instantaneous heat source by superposition. The thermoelastic problem for the instantaneous rectangular heat source in a infinite surrounding is solved exactly. An important step is the introduction of so-called quadrantal heat sources. The solution for the rectangle is obtained from four quadrantal solutions. The solution for the quadrantal heat source depends on the three dimelasionless coordinates only. Time occurs in the scale factors only. The condition of zero normal and shear stresses at the ground surface is fulfilled by using a mirror heat source and a boundary solution. The boundary solution accounts for the residual normal stress at the ground surface. Using a Hertzian potential, a surprisingly simple solution is obtained. The final analytical solution is quite tractable considering the complexity of the initial problem. The solution may be used to test numerical models for coupled thermoelastic processes. It may also be used in more detailed numerical simulations of the process near the heat sources as boundary conditions to account for the three-dimensional global process.  相似文献   

云南孟连西7.3级、武定6.5级、丽江7.0级三次强震前地震波振幅比的时空演化特征   总被引：1，自引：0，他引：1  

蔡静观  王兴辉  雷素华  张喜玲  李永莉 《地震研究》1998,(1)

１９９５年７月１２日至１９９６年２月３日短短７个月,云南地区连续发生了孟连西中缅边境７．３级、武定５．５级、丽江７．０级３次强震,本文研究了近期这几次强震前５个地震台地震图垂直分量Ｓ、Ｐ波最大振幅比的时空演化特征,动态追踪了振幅比明显偏离平稳态的突变过程。发现主震前５—８年,７级大震震中１００ｋｍ范围出现振幅比高（低）值突变,６级强震震中１３０ｋｍ范围出现振幅比高值突变,当振幅比的突变在缓升（降）的背景上骤升（降）,或突变异常的地震次数明显增加,则中长期异常进入中短期阶段。在强震震中１３０ｋｍ范围内的地震台（近台）振幅比值高达１５．２以上,而远离强震震中２５０ｋｍ以外的地震台（远台）振幅比最大值仅为９．８,近台的突变幅度至少比远台大３０％。而强震成组发生前一年半时间内,位于强震震中１１０ｋｍ范围内的近台振幅比的突变幅度比远在２５０ｋｍ外远台大５５—７５％。对振幅比的突变和时空演化特征从非线性动力学模型和模拟实验结果进行了初步成因探讨。  相似文献   

小江断裂带中段晚新生代构造盆地演化阶段   总被引：5，自引：0，他引：5  

沈军  俞维贤 《地震研究》1998,21(1):58-64

小江断裂带中段的盆地可以划分三个阶段,即Ｎ２－Ｑ１,Ｑ２末－Ｑ３初和Ｑ３－Ｑ４。这些盆地受小江断裂带左旋走滑运动控制。  相似文献   

地震综合前兆场建场方法初探          下载免费PDF全文

夏玉胜  梁子斌  蔡红卫  张慧  杨丽萍  张敏 《地震工程学报》1998,20(1):42-46

初步建立了一种能反映地震前兆时空演化全貌的无量纲、归一化可迭加的信息场———综合前兆场．通过对研究区（东经１１３°～１２５°,北纬３２°～４４°）前兆场时空演化过程的分析发现,地震前前兆场由正常的低值离散逐渐发展为围绕震中呈高值封闭状态,震后恢复正常．该方法的独特之处在于,避开了某些单项异常对应某具体源的分析,而是只考虑异常．根据前兆场的变化可以确定震源的大致位置  相似文献   

共和7.0级地震前地下流体前兆的动态演化特征   总被引：3，自引：1，他引：2       下载免费PDF全文

刘耀炜  张元生 《地震工程学报》1998,20(1):59-64

使用40个地下流体观测点的资料,对1990年4月26日青海省共和M_S7.0地震的前兆动态特征进行了系统研究.结果表明:(1)地震带内观测点的水氡趋势异常及水化、水位群体异常及频次异常与断层平均形变速率呈同步变化.地下流体群体异常频次的累加值曲线在地震前表现为指数加速变化图形.(2)震源外围240km范围内的水氡中短期趋势上升异常,表现为由震源逐渐向外围扩散的特点.在短临阶段各测点水氡的异常变化基本同步.(3)流体短临前兆出现明显的起伏加剧和层次现象,突出的表现是流量、断层气日变化在临震阶段出现3次加剧,且异常幅度一次高于一次.  相似文献   

Lithospheric Geothermal Structure in Yunnan, China   总被引：2，自引：0，他引：2  

Zhou Zhenheng  Xiang Caiying  and Deng WanmingSeismological Bureau of Yunnan Province  Kunming  China Institute of Geology  Chinese Academy of Sciences  Beijing  China 《中国地震研究》1998,(1)

In this paper,the characteristics of the lateral variations of the deep heat flow and Hthospheric geotemperature distribution in Yunnan have been studied,and the lithospheric geothermal structure has been divided into three types,i.e.the geothermal structure in the typical modern tectonically active region,transitional geological region and stable geological region.Finally,the relationship between the geotherm and seismicitv has been discussed.  相似文献