内蒙古赤峰柴胡栏子金矿基性麻粒岩包体特征及其成矿动力学意义

柴胡栏子金矿位于华北板块北缘,属中温热液蚀变岩型金矿。金成矿与矿区北部的早中生代辉石闪长岩体有密切关系。在辉石闪长岩体内发育大量包体,可以分为基性麻粒岩和角闪岩两类包体。包体的地球化学、形成温压条件表明基性岩包体为来源于大陆下地壳的基性麻粒岩包体,来源深度大约相当于下地壳中部-中上部位置,为早中生代时期底侵作用的产物。角闪岩包体来源于下地壳上部-中地壳下部位置,被上升岩浆带至地壳浅部。包体和寄主岩石具有相似的地球化学和氧、铅、锶、钕同位素特征,说明二者具有相同的岩浆来源。基性麻粒岩包体为底侵作用早期形成的堆晶岩受到后续岩浆的烘烤发生麻粒岩化形成。基性麻粒岩和寄主岩石辉石闪长岩与金矿床形成的密切时空关系显示底侵作用对柴胡栏子金矿含矿流体形成、运移和矿质富集有重要控制作用,其中 H2O和CO2等挥发性组分对控制流体形成和演化有至关重要作用。基性麻粒岩包体发育为成柴胡栏子金矿成矿物质来源于深部提供了有力的证据。     

Experimental Study of Wave Pressure on a Breakwater Pier

Test studies on the wave pressure on a breakwater pier show that the influence of transmissivewave pressure on the outside wall of the breakwater pier is considerable,when the width of the pier is notvery large.The variations of transmissive wave pressure on the breakwater pier with different widths arecompared and the relationship is obtained between relative transmitting distance b/L and wave pressurereduction factor K,which may be used in the design of similar breakwater piers.     

Research on Seismological Anomaly in Southeastern Coastland, China

A synthetic earthquake prediction parameter, seismological anomaly, using the CAPSeis software to analyze the nine parameters of b-value, N-value, η-value, C-value, D-value, scismless value, GL-value, and Rm-value in southeastern coastland of China, were obtained in this paper. The probability prediction effect of seismological anomaly is much better than the statistical probability of the parameters mentioned above.     

Scientific Train of Thought and Methodological Innovation in the Intelligent Decision Support System for Earthquake Prediction in China

The level of present understanding of earthquake prediction of seismologists at home and abroad is very different. This is because China has opened up a special path of earthquake prediction research that has not been explored by other countries, with its own advantages and potentialities.Therefore, we considered that it is the most practical way to use the advantages and potentialities for raising the earthquake prediction level. For this purpose, we have developed a set of intelligent decision support system for earthquake prediction, with the analysis of cluster anomalies process at the core. The facts show that it can obviously raise the level of synthetic earthquake prediction.     

Earthquake recurrence on whole active fault zones and its relation to that on individual fault-segments

IntroductionEarthquake recurrence models established on activity behaviors of strong earthquakes are the bases of long-term earthquake prediction, seismic risk zonation, and seismic hazard assessment. A lot of studies have been carried out on earthquake recurrence behaviors for specific seismogenic sources or fault-segments, and a series of empirical recurrence models have been proposed, such as the time-predictable model and the slip-predictable model for earthquakes repeated at the previous …     

青海共和7.0级强震的前兆异常与时空分布

在研究了 1 990年 4月 2 6日共和 7.0级强震前 ,青海东北部地区的小震活动和前兆异常总台频次的变化 ,以及地下流体 ,电磁 ,形变等前兆异常的时空演化特征的基础上 ,得出在大震前 1～ 7个月前兆异常台项总频次的升高和 2 .0～ 3.9级地震形成的条带和空区 ,以及 3.5级以上地震频次增加在时间上是同步的。而且 ,2 .0～ 3.9级地震形成的条带和空区对未来大震的震中位置具有指示意义。这种前兆异常在时间上的同步性可能是大震前的异常由中期向短期过渡的时间标志 ,震前 2个月出现的前兆台项总频次异常峰值以及形变前兆异常场兆变化则是异常进入短临的时间。     

关于认识性与应用性区域综合自然地理区划特点的探讨——以湖南省为例

认识性区划的特点在于具有严格等级单位系统;而应用性区划则是依据认识性区划揭示出来的地域分异规律,结合一定生产要求,反映地表自然综合体的关系。     

柿竹园钨锡钼铋矿床主要矿石矿物研究

作者通过X射线衍射、化学和电子探针分析法研究了柿竹园矿床中的主要金属矿物和少量金属矿物。黑钨矿的FeO/MnO比值接近1:1,Nb_2O_5和Ta_2O_5的平均含量分别为0.263％和0.649％。白钨矿含CaMoO_4分子0—40％,在紫外线照射下能发荧光,当MoO_3含量<0.4％时,发淡天蓝色荧光,>0.4％发白光,>2％发淡黄光,>4％则发黄光。矿石中的辉钼矿属2H_1型,含铼低。辉铋矿是所有含铋矿物中最大量的矿物,而自然铋、辉铅铋矿、斜方辉铅铋矿、针硫铋铅矿和辉碲铋矿则很少量。云英岩中锡石的Nb、Ta含量分别为0.15％和0.88％,高于其他类型中矿石的含量。大理岩网脉中的尼日利亚石含TiO_20—3.75％。脉中木锡石和黄锡矿少,还发现很少的钽钇易解石和晶质铀矿。     

含锡自然铜研究

本文对发现于河南毛堂金矿田氧化矿石中的含锡自然铜进行了矿物学研究。该矿物属等轴晶系,O_h~5-F_(m3m),a_0=3.655?,Z=4。化学成分中Cu 90.38(wt)%,Sn 9.38(wt)%,分子式Cu_(18)Sn。含锡自然铜相当于Cu_(18)Sn合金中的a相,在自然界属首次发现。     

江苏发现的硼锡钙石及其研究

硼锡钙石是一种罕见的岛状硼酸盐矿物,其化学式为CaSn[BO_3]_2。一轴晶,负光性,折光率No=1.774,Ne=1.661,比重为4.09,发育{0001}解理,乳白色。矿物产于苏州花岗岩与大理岩接触带矽卡岩中的一个萤石矿床内。它是一种富含硼、氟的高温气液流体作用于钙质围岩而发生交代的产物。它的发现,不仅对矿物产状提供了新的资料,而且对锡、硼的地球化学以及硼酸盐矿物的研究也具有一定的学术意义。