淮河流域洪涝变化吸引子维数研究

淮河流域洪涝序列的功率谱表现出了较好的混沌谱特征,这是序列呈分形结构的内在原因。洪涝序列及其不同平滑序列的关联维数表明,序列平滑程度越大,关联维数越小,关联维数反映了序列所在系统的层次,是系统结构复杂性的重要量度,是 系统建模所需独立变量的控制参数。要恰当地描述淮河流域洪涝发生系数,需构造至少５个状态变量的动力学系统。     

Analysis of seismic dynamical systems

A procedure is presented for the analysis of complex stationary time series for which the Fourier power spectra reveals broadband noise or broadened pulses. We first determine the Hurst exponent from which we may know whether the time series under study is mainly random or if the data points present correlations. If the data are correlated, a chaotic analysis will reveal whether they may be interpreted as a low dimensional nonlinear system (defined by a low correlation dimension and a finite and positive Kolmogorov entropy and largest positive Lyapunov exponent) or as a stochastic process. We have studied three kind of temporal series: inter-event time series of infrasonic pulses recorded at Stromboli volcano, and, S-coda waves and microseisms, that have been recorded at the eastern Pyrenees. Results show that microseisms and Coda waves can be modeled as a low dimensional deterministic system, Correlation dimensions 2.3, 3.2, respectively. At the contrary infrasonic has resulted stochastic. This chaotic character can be attributed to the medium properties. Coda waves with scattering through a fractal distribution of scatters or to multiple reflection inside resonators (for example sedimentary basins) and microseisms as a propagation of wave guide of variable cross section which have the same temporal characteristics as a nonlinear forced oscillator.     

Metallogenetic characteristics of an unique uranium-tungsten mineralization zone

A polymetallic zone dominated by U-W mineralization was found in Northeast Guangxi. Distributed along the east contact zone of a complex granite mass, it extends for about 100 km in length, with more than fifty deposits and prospects embraced. The deposits show a wide range of genetic types, related to the granite, from magmatic (including pegmatite and skarn deposits) through hydrothermal mineralizations (hypo-, meso- and epithermal) all the way to tin placers, constituting a very intact metallogenetic series of granites. The epithermal U-W deposits are considered as a new type for their unique geological and geochemical characters, such as the paragenesis of U and W and the large time gap (> 40 Ma) between ore and granite. This project was financially supported by the Open Lab. of Ore Deposit Geochemistry, Chinese Academy of Sciences.     

非迭代,非线性二维重力反演计算方法

本文叙述了非迭代、非线性二维重力反演方法的原理、模型计算及应用效果等。与以往诸多的求界面重力反演方法相比,该法的主要特点是：将界面的深度用一幂级数的形式表示,且幂级数系数的计算与界面上下地层的密度差无关。因此,一旦求出了幂级数的系数,由界面的密度差可直接得到界面的深度,且幂级数收敛的速度很快。     

新疆阿尔泰造山带矿床成矿系列

在系统分析阿尔泰造山带成矿区（带）地质构造演化和成矿特点基础上,划分了４个矿床成矿系列、４个矿床成矿亚系列和６个矿床式。矿床成矿系列和亚系列的形成和分布受区域构造岩浆演化制约。阿尔泰造山带矿床成矿系列具有鲜明的晚古生代成矿作用特点。区域构造演化的规律和后期构造对早期构造的叠加,决定了矿床成矿系列的规律分布和局部复合。     

Mesozoic Granitoid Types and Metallogeny of the East China Circum-Pacific Continental Margin

Abstract: This paper synthesizes the geotectonic background, genetic types and metallogenetic relations of the Mesozoic granitoids in the East China continental margin. By the Mesozoic, the Siberia Plate, North China Plate and South China Plate amalgamated together, resulting in formation of a unified Eurasia super–continent. Since the late Triassic to early Jurassic period, the territory of East China gradually became a Cordilleran style active continental margin. During the Jurassic to early Cretaceous (early to middle episodes of Yanshanian orogeny), the Paleo-Pacific plate strongly collided with and subducted under the Eurasia continent, reactivated the consolidated East China continental margin. The granitoids of both transformation series and syntexis series were generated. Many granitoid-related large and giant metal deposits were formed. Furthermore, the W, Sn, Be, Nb, Ta and U mineralizations are mostly associated with the transformation series; while the Fe, Cu, Mo and Au mineralizations are mostly associated with the syntexis series. The late Yanshanian orogeny (late Cretaceous) began a transition to the western Pacific style continental margin. A tensional environment resulted in development of alkaline granitoids and formation of continental red basins. The Cenozoic orogeny was characterized by a backarc spreading and rifting regime in this region.     

甘肃敦煌地区太古宙孔兹岩系特征

本文根据甘肃敦煌地区广泛出露在太古宙TTG杂岩中的一套副变质岩系的岩石组合、典型矿物组合、变质相特征和岩石化学特征的分析,认为它们是一套中深变质的碎屑岩-泥质岩-泥灰岩-碳酸盐建造,其中夹有少量的变质基性火山岩。原岩形成于具有基性火山作用的活动大陆边缘滨海-浅海环境。经过太古宙的区域高角闪岩相变质作用,形成孔兹岩系。     

柞水原划泥盆系中发现早前寒武纪变质岩系

本文阐述了作者在1：5万区调填图中,从柞水地区商丹断裂带南侧原划泥盆系刘岭群桐峪寺组中解体出前寒武纪中深变质岩系,取得了同位素全岩Sm－Nd年龄平均值2499．83Ma的数据,这对研究秦岭造山带的演化具有重要的地质意义。     

论燕北地区辽代的气候特点

本文利用《辽史》中“帝王纪”、“游幸表”、“食货志”和同时代“宋人使辽语录”中所记载的有关旱、涝、冻灾记录,对928～1109年共182年间燕北地区的历史气候进行了复原。研究结果表明,辽代燕北地区的干湿变化过程中,早期以干为主,中、晚期以湿为主。1080年前后为一气温剧烈下降时期,比黄淮海地区的同期变化要早约30年。     

腐泥煤变质系列热解色谱和氯仿沥青“A”的特点

对滕县、淄博两煤田与腐殖煤共生的不同煤级的腐泥煤进行了热解和氯仿沥青“Ａ”的族组份分析,获得如下认识：热解的结果,Ｔｍａｘ、Ｓ１、Ｓ３、Ｉｐ全部高于共生腐殖煤,Ｉｔ全部低于共生腐殖煤,Ｓ２和Ｃｐ在低煤化阶段高于腐殖煤,而中,高煤化阶段则低于腐殖煤;氯仿沥青“Ａ”都随煤级的增高而减少,腐泥煤全部高于腐殖煤,腐泥煤从低煤级到高煤级其族组份的排序从饱和烃＞非烃＞芳烃＞沥青质变化到非烃＞芳烃＞沥青质＞饱和烃;而腐殖煤族组份的排序则从沥青质＞芳烃＞非烃＞饱和烃＞沥青质。