辽宁弓长岭中太古代片麻状花岗岩和铬云母石英岩的锆石年龄

应用离子探针质谱技术,从弓长岭地区片麻状花岗岩和铬云母石英岩中的锆石分别获得3.0Ga和3.1—3.4Ga的年龄数据,前者代表片麻状花岗岩的侵入年龄,后者代表铬云母石英岩母岩形成年龄的下限值。在片麻状花岗岩中,有少量锆石还测得3.3—3.6Ga的年龄,可能表明它们来自更为古老花岗质岩石的继承锆石。这些年龄数据的获得,为深入研究本地区早期地壳的形成与演化、在更大范围内寻找早中太古代古老岩石、确定碎屑沉积岩与母岩的关系等都具重要的意义。     

察尔汗首采区卤水中锂同位素组成

本文详细研究了察尔汗首采区卤水及其周边水源中的锂同位素组成,结果表明,察尔汗首采区平均δ~6Li值为-30.5‰,与海水的δ~6Li值相似,这样低的δ~6Li值与首采区卤水中发生的锂同位素分馏有关,且受具有低δ~6Li值的周边补给水的影响。     

The phenomena of bifurcation and catastrophe of large-scale horizontal motion in the atmosphere under the effect of Rossby parameter

The stability question of large-scale horizontal motion in the atmosphere under the effect of Rossby parameter is discussed in this paper by using the qualitative analysis theory of ordinary differential equations. The following as-pects are reviewed: The stability of large-scale horizontal motion in the atmosphere accords with the common inertial stability criterion when the effect of Rossby parameter is not considered (Yang, 1983), and that, on the other hand, the motion will bifurcate two times with the variation of absolute vorticity of basic Zephyr flow at the initial position under the effect of Rossby parameter. Furthermore, in the inertial stable region, if the effect of geostrophic deviation at the initial position is considered, the motion will not only bifurcate but also generate a catastrophe.     

Groundwater Behaviour in Layered Slope Rock Mass And Finite Element Simulation

The paper deals with the relatively weak permeable layer in a layered structure of a slope rock mass and itseffect on groundwater behaviour in the rock mass. When the whole groundwater table is declined in such typeof slope rock mass, the permeability of the relatively weak permeable layer in the middle will be several timeslower than that of the upper and lower permeable layers and consequently the water level in layers of differentpermeability will fall in different rates which will lead to a discontinuous phenomenon of the water body. Amethod of finite element simulation on a vertical two-dimensional profile is suggested for the study of the phe-nomenon and its application to practical situation is described. The calculation result shows that the existingweak permeable layer in a layered slope rock mass exerts unnegligible influence on the variation of water levelin the rock mass of a slope. The result also proves the applicability of the finite element simulation method.     

滇01井水位动态与地震关系的分析研究

滇01井近年来多次住滇东断裂系上地震前有较好的反映,为了揭示该井水位映震关系,作者对观测以来6年的资料开展了单井区域地质、水文地质条件、水位正常动态、异常动态特征的分忻研究,并利用多种数学方法判定异常,总结了11次震例,提出了该井异常、预报指标,还对映震能力作了分析。     

THE ROLE PLAYED BY WASH LOAD DEPOSITION IN THE FORMATION OF DIFFERENT RIVER PATTERNS

ＴＨＥＲＯＬＥＰＬＡＹＥＤＢＹＷＡＳＨＬＯＡＤＤＥＰＯＳＩＴＩＯＮＩＮＴＨＥＦＯＲＭＡＴＩＯＮＯＦＤＩＦＦＥＲＥＮＴＲＩＶＥＲＰＡＴＴＥＲＮＳＴｈｅｌｏｗｅｒｌａｙｅｒｏｆｔｈｅｂｅｄｍａｔｅｒｉａｌｃｏｎｓｉｓｔｓｏｆｔｉｎｅｓａｎｄａｎｄｔｈｅｕｐｐｅｒｌａｙｅｒｃｏｎｓｉｓｔｓｏｆａｍｉｘｔｕｒｅｏｆｃｌａｙ（１０％）ａｎｄｔｉｎｅｓａｎｄ（９０％）．ＮＡＴＵＲＡＬＲＩＶＥＲＳｌ．ＣｈａｎｇｅｏｆｃｈａｎｎｅｌｐａｔｔｅｒｎｓａｌｏｎｇａｒｉｖｅｒｃｏｕｒｓｅＩｔｉｓｃｏｍｍｏｎｔｈａｔｉｎｔｈｅｕｐｐｅｒＰａｒｔｏｆａｎａｌｌｕｖｉａｌｒｉｖｅｒｔｈｅｌｏｎｇｉｔｕｄｉｎａｌｓｌｏｐｅｉｓｓｔｅｅｐａｎｄｔｈｅｒｉｖｅｒｃａｒｒｉｅｓｈｅａｖｙｓｅｄｉｍｅｎｔｌｏａｄ．Ｄｕｅｔｏｔｈｅｓｔｅｅｐｓｌｏｐｅａｎｄａｓｓｏｃｉａｔｅｄｈｉｇｈｖｅｌｏｃｉｔｙｃｌａｙｓｅｔｔｌｅｓｌｉｔｔｌｅｅｖｅｎｏｎｔｌｏｏｄｐｌａｉｎ．Ｆｌｏｏｄｐｌａｉｎｏｒｒｉｖｅｒｈａｎｋｃｏｎｓｉｓｔｓｏｆｓｉｌｔａｎｄｔｉｎｅｓａｎｄ．Ｔｈｅｒｉｖｅｒｂｅｈａｖｅｓａｓａｗａｎｄｅｒｉｎｇｏｎｅ．Ｐａｓｓｉｎｇａｃｅｒｔ     

南口,大灰厂水平形变资料的初步分析

对南口，大灰厂水平形变监测网的全部观测资料进行了处理和分析。结果表明：在１９８８－１９８９年期间，该区构造活动速率较大；１９８９－１９９２年虽然运动趋势没有明显的改变，但断裂活动平缓。这一活动过程可能与大同地震有关。该区整体运动性质以滑脱伸展为主，力学性质为张拉笥，与地质构造活动特征相吻合。表明了所建的水平形变测网具有一定的监测能力。     

基于零立体像对立体匹配的配后质量控制

立体匹配的质量控制对数字摄影测量产品的质量起着关键的作用。本文首先分析了现有的各种质量控制策略，然后根据正射影像同ＤＴＭ及匹配点位存在的固有关系，提出了用零立体像对再匹配作为立体匹配的配后质量控制方案，为立体匹配质量控制开辟了崭新的途径。     

江西岩背火山-侵入杂岩的微量元素协变关系及其岩浆房成分分带形成机制的探讨

以根据岩背斑岩锡矿区火山－侵入杂岩的微量元素Ｓｒ、Ｒｂ、Ｅｒ、Ｈｆ、Ｎｂ等协交关系，探讨了岩浆房成分分带的形成机理。认为初始岩浆的形成主要是经过两次聚集熔融作用（第一次熔出酸性岩浆，第二次熔出中酸性岩浆）。酸性岩浆未喷出地表的部分在中深部位经过平衡结晶作用（非理想），使Ｆ、Ｈ２Ｏ和成矿元素明显集中于晚期岩浆中。     

Petrogenesis of potassic alkaline volcanics associated with rapakivi granites in the Proterozoic rift of Beijing,China

Summay A suite of potassic alkaline volcanites is spatially and temporally associated with rapakivi granites which are related to Proterozoic (1.85 to 1.40 Ga) rifting in the Beijing area. The volcanites are spread along an EW-trending 150 km long sea basin rift and the rapakivi granites were emplaced along a major EW-fault in nn adjacent uplifted region. The alkaline magmatism is comparable to the middle Proterozoic anorogenic magmatism in North America and Fennoscandia and is related to incipient breakup of the craton they intrude. The volcanic rocks and the rapakivi granites show within plate affinities. They also have similar overall REE distribution patterns that are enriched in LREE. The rapakivi granites show larger negative Eu anomalies than the volcanites. The data suggest that the rapakivi granites were crystallised from a more evolved magma than the volcanic rocks.

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Petrogenese von K-reichen, alkalischen Vulkaniten in Assoziation mit Rapakivi-Graniten im proterozoischen Peking-Rift, China

Zusammenfassung Eine Serie von K-reichen, alkalischen Vulkaniten ist räumlich und zeitlich mit Rapakivi-Graniten, die mit dem proterozoischen (1.85 bis 1.40 Mia) Rifting in der Peking Region im Zusammenhang stehen, assoziiert. Die Vulkanite treten entlang eines E-W-streichenden, 150 km langen Riftbeckens auf, die Rapakivi-Granite kommen entlang einer EW Hauptstörung in einer angrenzenden Hebungszone vor. Der Alkali-Magmatismus ist mit dem mittelproterozoischen, anorogenen Magmatismus in Nordamerika und Fennoskandien vergleichbar und mit einem beginnenden Aufbrechen des Kratons ver bunden. Sowohl die Vulkanite, wie auch die Rapakivi-Granite zeigen Intraplatten-Affinität. Sie zeigen generell ähnliche SEE Verteilungsmuster, die an LSEE angereichert sind. Die Rapakivi-Granite zeigen weiters eine stärkere, negative Eu-Anomalie als die Vulkanite. Diese Daten weisen darauf hin, daß die Rapakivi-Granite aus einem höher entwickelten Magma als die Vulkanite entstanden sind.