滇西水成铀矿勘探综合测井成果

滇西龙川江盆地发现水成铀矿。本文借助地球物理综合测井技术，对龙川江盆地水成铀矿的成矿规律作有益分析和探讨。重点论述滇西水成铀成矿的成矿（沉积）环境及其成矿物征。     

河南焦作云台山早前寒武纪变质基底锆石SHRIMP U-Pb年龄

应用离子探针技术,对华北太行山南缘钾长石化长英质副片麻岩和钾长石化片麻状奥长花岗岩进行了锆石年龄测定。钾长石化长英质副片麻岩的变质原岩为泥砂质碎屑沉积岩,其形成时代很可能为新太古代。碎屑锆石普遍存在强烈铅丢失,靠近上交点的5个数据点207Pb/206Pb加权平均年龄为3399Ma±8Ma,代表了物源区组成的时代。钾长石化片麻状奥长花岗岩2组锆石207Pb/206Pb加权平均年龄分别为2511Ma±13Ma(岩体形成时代)和2735Ma±16Ma(残余锆石年龄),分别代表该岩体形成时代和残余锆石年龄。新的资料支持了华北克拉通中部造山带太古宙地质体与其东部陆块存在亲缘关系的认识。     

Investigating the propagation mechanism of unmodelled systematic errors on coordinate time series estimated using least squares

The propagation of unmodelled systematic errors into coordinate time series computed using least squares is investigated, to improve the understanding of unexplained signals and apparent noise in geodetic (especially GPS) coordinate time series. Such coordinate time series are invariably based on a functional model linearised using only zero and first-order terms of a (Taylor) series expansion about the approximate coordinates of the unknown point. The effect of such truncation errors is investigated through the derivation of a generalised systematic error model for the simple case of range observations from a single known reference point to a point which is assumed to be at rest by the least squares model but is in fact in motion. The systematic error function for a one pseudo-satellite two-dimensional case, designed to be as simple but as analogous to GPS positioning as possible, is quantified. It is shown that the combination of a moving reference point and unmodelled periodic displacement at the unknown point of interest, due to ocean tide loading, for example, results in an output coordinate time series containing many periodic terms when only zero and first-order expansion terms are used in the linearisation of the functional model. The amplitude, phase and period of these terms is dependent on the input amplitude, the locations of the unknown point and reference point, and the period of the reference point's motion. The dominant output signals that arise due to truncation errors match those found in coordinate time series obtained from both simulated data and real three-dimensional GPS data.     

时间序列转折突变点检测的线性函数方法

根据转折突变的定义，在引入线性半截多项式的前提下，提出检测时间序列转折突变点的一种新方法。此方法不仅能找出时间序列中存在的多个转折突变点，而且使得检测到的突变点通过统计显著性检验。应用此方法对北半球1851—1990年年平均气温距平及其11年滑动平均序列，1901—1999年昆明5月降水及其11年滑动平均的降水序列分别进行了检测。发现北半球年平均气温距平在1879、1889、1939和1973年附近出现了年际转折突变，在1878、1888和1941年以及1972年出现了年代际尺度的转折突变；昆明5月雨量不存在年际转折突变点，但昆明5月雨量在1918、1966以及1978年附近出现了年代际尺度转折突变。     

同位素地质学定年方法评述

详细分析了当前同纱年代学的常用定年方法，如K-Ar法，U-Pb法，Rb-Sr法和Sm-Nd法等的适用性和局限性。讨论了地质事件定年过程中存在的一些问题，提出了准确定年的注意事项。     

雷达遥感在澜沧江中下游地区锰矿调查评价中的应用

澜沧江吓游地区地处热带-亚热带，植被及第四系覆盖严重，应用雷达遥感技术可以初步揭露植覆盖，利用SAR图像识别主要岩石类型和构造形式，并圈定了主要含锰岩系，进而确定了成锰有利地段。     

铅锌矿床Rb-Sr定年研究综

本文在总结Rb-Sr等时线定年的基本前提和矿床Rb-Sr等时线定年存在的问题的基础上,综述了铅锌矿床流体包裹体和闪锌矿Rb-Sr等时线定年的研究进展,同时对该定年方法存在的问题进行了简要评述。综合分析表明,Rb-Sr等时线定年(尤其是闪锌矿Rb-Sr等时线定年)为铅锌矿床较理想的直接定年方法,但该定年方法还存在许多理论和技术问题,有待深入研究;铅锌矿床Rb-Sr等时线定年应以深入细致的地质、地球化学研究为基础,定年过程中必须严慎对待样品采集、样品挑选、流体包裹体溶液提取和质谱分析等各个环节。     

沐川太平砂岩型铼钼（饿）矿点的地质特征和矿化时代

四川沐川县民主-太平-带含钼砂岩为一新矿化类型——沉积砂岩型铼钼（锇）矿点。X-射线粉晶衍射分析结果表明其中微-细晶鳞片状含钼矿物为晶质辉钼矿；高精度质谱分析发现辉钼矿中分散元素Re和铂族元素Os含量很高，具有重要的综合利用价值；高精度Re-Os同位素测年证明辉钼矿形成年龄与含矿的中生代红物学和矿床学均具有重要的理论意义和应用价值。     

Rate of strike-slip motion on the Amanos Fault (Karasu Valley, southern Turkey) constrained by K–Ar dating and geochemical analysis of Quaternary basalts

The left-lateral Amanos Fault follows a 200-km-long and up to 2-km-high escarpment that bounds the eastern margin of the Amanos mountain range and the western margin of the Karasu Valley in southern Turkey, just east of the northeastern corner of the Mediterranean Sea. Regional kinematic models have reached diverse conclusions as to the role of this fault in accommodating relative motion between either the African and Arabian, Turkish and African, or Turkish and Arabian plates. Local studies have tried to estimate its slip rate by K–Ar dating Quaternary basalts that erupted within the Amanos Mountains, flowed across it into the Karasu Valley, and have since become offset. However, these studies have yielded a wide range of results, ranging from 0.3 to 15 mm a⁻¹, which do not allow the overall role and significance of this fault in accommodating crustal deformation to be determined. We have used the Cassignol K–Ar method to date nine Quaternary basalt samples from the vicinity of the southern part of the Amanos Fault. These basalts exhibit a diverse chemistry, which we interpret as a consequence varying degrees of partial melting of their source combined with variable crustal contamination. This dating allows us to constrain the Quaternary slip rate on the Amanos fault to 1.0 to 1.6 mm a⁻¹. The dramatic discrepancies between past estimates of this slip rate are partly due to technical difficulties in K–Ar dating of young basalts by isotope dilution. In addition, previous studies at the key locality of Hacılar have unwittingly dated different, chemically distinct, flow units of different ages that are juxtaposed. This low slip rate indicates that, at present, the Amanos Fault takes up a small proportion of the relative motion between the African and Arabian plates, which is transferred southward to the Dead Sea Fault Zone. It also provides strong evidence against the long-standing view that its slip continues offshore to the southwest along a hypothetical left-lateral fault zone located south of Cyprus.