一种高精度星载导航星库的构建方法

在选用高精度基本星表的基础上,分析了导航星的选取方法及其分布特征。为了利用导航星的观测位置信息,给出了从星表平位置到星心视位置的高精度转换方法。基于分区法制定了导航星库,并给出了存储及读取方法,对该星库的访问具有简单、快速、占用资源少等优点,适合星载使用。     

广西珊瑚矿区中部成矿期构造应力场、热力场和地球化学场的耦合作用及成矿分析

通过对裂隙强度、蒸发晕和原生晕的系统研究,作者提出了长营岭和八步岭均存在隐伏岩体。成矿早期以岩体的热力场作用为主,形成矿区的水平倾向分带;中晚期以构造应力场作用为主,形成矿床的垂直逆向分带。根据矿液流向等方面资料分析,长营岭岩体的高点应位于矿床中北部,而不是以往所认为的南部。本区深部找矿的重点也应放在矿床的中北部。     

银山多金属矿床原生分带形成的矿物溶解度原因

银山多金属矿床发育有序的原生金属分带,以3#和13#次火山岩的铜区作为成矿中心向上向外,由Cu－S－Au带、Cu－Pb-Zn带、Pb→Zn－Ag带→Pb-Ag带。使用多相多组分化学平衡计算程序（VCS）,模拟了成矿过程中主要成矿元素的溶解度,结合已有的实验研究成果,从环境物理化学条件改变对矿物溶解度影响的角度．探讨了原生金属分带形成的化学机理。研究不仅更深入地揭示了分带形成的物理化学因素,而且对进一步认识络合物在热液成矿中的意义具有重要的启示。     

银山多金属矿床成矿分带的流体动力学计算模拟

对江西银山矿床流体动力学热质输运数值模拟研究表明,矿区出露的火山岩墙尽管与矿化有密切的时空联系,但不能产生持久高强度的引起大范围矿化的能量场。模拟证实,矿区深８中存在隐伏岩体,其形态可能受银山背斜的控制,岩体顶面向南缓倾是矿化由早至晚由北东向南西迁移的主要原因。模拟结果合理解释了矿床分带的偏心规律。运用流体动力学计算模拟进行深部成岩预测,取得了预期效果。     

山西原平狐狸山金矿围岩蚀变特征与金矿化的关系

狐狸山金矿是韧性剪切带型金矿床，矿区围岩蚀变发育广泛，类型有碳酸盐化，绢云母化，硅化等，蚀变分带明显，且蚀变强度与金矿化关系密切。围岩蚀变受韧性剪切变形影响，金矿化与围岩蚀变的主要期次同时形成。     

Oscillatory zoning in eclogitic garnet and amphibole,Northern Serpentinite Melange,Cuba: a record of tectonic instability during subduction?

Exotic blocks of eclogite from distant localities along the Northern Serpentinite Melange of Cuba have comparable P–T histories that include high‐pressure prograde sections (450–600 °C, >15 kbar) associated with subduction of oceanic lithosphere, and retrograde sections within the albite–epidote amphibolite facies (<500 °C, <10 kbar) related to melange uplift. ⁴⁰Ar/³⁹Ar and Rb/Sr cooling ages (118–103 Ma) of one of the blocks indicate pre‐Aptian subduction and Aptian–Albian uplift. Detailed X‐ray imaging and profiling further reveals that minerals in these eclogite blocks (notably garnet and amphibole) display subtle but well defined oscillatory zoning that developed along the prograde trajectory of the rocks, previous to attainment of peak eclogitic conditions. The chemistry (e.g. coupled changes of Mg# and Mn in garnet, and of Si, Ti, Al and Na in amphibole) and geometry (euhedral to anhedral shapes) of the oscillations can be interpreted in terms of subtle fluctuations in P–T during the general prograde subduction‐related metamorphic path. A (near‐) equilibrium model is presented for the formation of oscillations at near peak conditions by means of recurrent dissolution‐growth reaction processes. This model for near‐peak conditions, and the chemical signatures of earlier oscillations (notably in amphibole), suggest that episodes of retrogression (upward movement?) affected parts of the subducting slab. It is proposed that these retrograde episodes record the tectonic rupture of the subducting slab and, probably, of the upper plate mantle, either due to the intrinsic dynamic behaviour of subduction systems or to the effects of the plate‐tectonic rearrangement of the Caribbean region during the Early Cretaceous.     

Regional variation in exhumation and strain rate of the high-pressure Sambagawa metamorphic rocks in central Shikoku, south-west Japan

Regional variation in the P–T path of the Sambagawa metamorphic rocks, central Shikoku, Japan has been inferred from compositional zoning of metamorphic amphibole. Rocks constituting the northern part (Saruta River area) exhibit a hairpin type P–T path, where winchite/actinolite grew at the prograde stage, the peak metamorphism was recorded by the growth of barroisite to hornblende and sodic amphibole to winchite/actinolite grew at the retrograde stage. In the southern part (Asemi River area), rocks exhibit a clockwise type P–T path, where barroisite to hornblende core is rimmed by winchite to actinolite. The difference in P–T path could suggest a faster exhumation rate (i.e. more rapid decompression) in the southern than in the northern part. On the other hand, physical conditions of deformation during the exhumation stage have been independently inferred from microstructures in deformed quartz. Recrystallized quartz grains in rocks from the low‐grade (chlorite and garnet) zones are much more stretched in the southern part (aspect ratio ≥ 4.0) than in the northern part (aspect ratio< 4.0), indicating a higher strain rate in the former than in the latter. These facts may indicate that the exhumation and strain rates are correlated (i.e. the exhumation rate increases with increasing the strain rate). The difference in the exhumation rate inferred from amphibole zoning between the northern and southern parts could be explained by an extensional model involving normal faulting, where the lower plate can be exhumed faster than the upper plate due to the displacement along the fault. Furthermore, the model may explain the positive correlation between the exhumation and strain rates, because the lower plate tended to support more stress than the upper plate.     

辽宁瓦房店金伯利岩中铬尖晶石成分的两种分带趋势及其成因探讨

首次报道金伯利岩中铬尖晶石的两种成分分带趋势，其中斑晶铬尖晶石以核部富Ｃｒ、边缘逐渐富Ａｌ和Ｆｅ￣（＋３）为特征，该铬尖晶石为金伯利岩岩浆上升过程中形成的；基质铬尖晶石则同上述变化趋势相反，它们是岩浆在温、压增大或母岩在熔融程度增加过程中形成的。根据Ｃｒ＿２Ｏ＿３含量，基质铬尖晶石可分为两类：一是岩浆演化晚期，岩管爆发前槽压过程中结晶的低铬铁尖晶石（Ｃｒ＿２Ｏ＿３＜５４％）；二是来自深源捕虏体的高铬铁尖晶石（Ｃｒ＿２Ｏ＿３＞６０％），本文探讨了它们的形成机制。     

小兴安岭地区与加里东期花岗岩类有关的矿床成矿系列

加里东期花岗岩类岩浆活动及其有关的成矿作用，在小兴安岭地区形成了一批铁、铜、锌、铅、锡、钼和钨等矽卡岩型和热液型的矿床。这些成因上紧密相关的矿床形成时间相近。不过，在不同的岩浆活动阶段和不同的地质环境中形成的矿床，，其矿化特征又有明显的差别，而且，矿种和矿化类型在空间的分布上，呈现有规律的分带象。本文着眼于研究上述的矿床所处的地质背景、成矿条件和成矿作用，用成矿系列的观点，对矿床进行矿亚系列和矿床     

吉林放牛沟硫铁多金属矿床原生地球化学异常特征

放牛沟矿床主要成矿元素Zn、Pb并非由地层提供,而是来自岩体深部,通过岩体接触带构造向火山—沉积岩系运移而形成矿床及原生异常的。Zn、Pb、Cu、Ag等元素正异常与Cr、Sr等元素负异常的套合产出是矿床存在的重要标志.矿体、矿组、矿床异常有明显的分带规律,分带性指数从浅部到深部呈规律性变化.根据Ag/Bi可判别前缘、尾晕,利用PbZnAgBa/CuBi可判别矿组和矿床原生异常的剥蚀程度.