阴山超大型硫化物矿床形成的有利条件

阴山中元古代成矿带（狼山 渣尔泰山）属于华北地台元古宙巨大成矿带的西段，产有多处硫铁 多金属矿床，一些已经达到超大型矿床的规模。它们形成的时代和地质环境具显著的热水沉积成矿的特征，可与世界中元古代ＳＥＤＥＸ对比。已经判别出成矿盆地及热水通道等。充足的物质来源、巨大的热源、热水系统演化的完整性、成矿盆地极好的封闭性保证了同生期成矿的高强度，造山期的后生作用也有明显叠加 改造作用     

初论胶北隆起地壳伸展作用

晚元古宙，胶北隆起在造山运动后期开始发生ＮＷ（Ｗ）→ＳＥ（Ｅ）方向的地壳伸展作用，突出表现于前寒武纪结晶基底内部，持续时间很长久（自晚元古宙开始，断续到中生代印支—燕山期），具有改造期伸展作用特点，区域构造处于十分激化的状态，导致褶皱变形及大规模花岗质岩浆侵位     

红河成矿带壳幔演化与成矿作用的年代学研究

年代学与钕模式年龄资料表明，红河成矿带的衰牢山群和瑶山群变质岩系属同一地层系列，主体部分形成时代为１．３５－１．７Ｇａ，但也存在晚元古代斜长角闪岩。该区不存在太古宇基底。     

北京顺义4.0级地震和震后首都圈地震趋势分析

１９９６年１２月１６日顺义Ｍｓ４．０地震，是北京地区近６ａ来最大的一次地震活动此次地震前，首都圈地区地震活动出现了近ＳＮ向弱震活动，１１月份地震活动是全的月频次最低的月份，这些异常现象之后发生了顺义地震。此次顺义地震属非前生震群活动。这次地震活动是顺义及其附近地区１９７０年以来地震活动余震最多的一次。这次地震后应注意今后几个月京西北、张家口附近发生Ｍｓ５．０左右地震的可能。     

华北晚太古代－早元古代高级变质区的变质PTt轨迹及其地壳热动力学演化模式

华北高级变质区是早前寒武纪下地壳的组成部分，经历复杂的地质演化。根据变质ＰＴｔ轨迹和变质矿物冷却年龄研究，确定高级变质区ＰＴｔ演化具有两种基本形式：（１）逆时针ＩＢＣ型轨迹和（２）顺时针ＩＴＤ型轨迹。前者属晚太古代末期变质事件，反映在相对稳定环境中地壳的缓慢冷却过程，下地壳冷却速率较小（＜０．３℃／Ｍａ）。后者代表早元古代变质事件，形成于地壳的构造隆升过程，下地壳冷却速率明显加快（２．４～３．７℃／Ｍａ）。高级变质区地壳热动力学状态由晚太古代末期重力均衡条件下的稳定状态转变为早元古代增厚地壳的构造隆升状态。这种转变起因于早元古代大陆增厚（造山）作用     

SHRIMP II dating of zircons and monazites: reassessing the timing of high-grade metamorphism and fluid flow in the Reynolds Range, northern Arunta Block, Australia

ABSTRACT Key insights into the timing of tectonometamorphic events in a complex high-grade metamorphic terrane can be obtained by combining results from SHRIMP II ion microprobe studies of individual monazite grains with SHRIMP II studies and scanning electron microscope (SEM)-based cathodoluminescence (CL) imaging of zircons. Results from the Reynolds Range region, Arunta Block, Northern Territory, Australia, show that the final episode of regional metamorphism to high-T and low-P granulite facies conditions is most likely to have occurred at c. 1580 Ma, not at 1785–1775 Ma, as previously accepted. The previous interpretation was based on zircon studies of structurally controlled granitoids, without SEM-based CL imaging. Monazites in a 1806± 6 Ma megacrystic granitoid preserve rare cores that are interpreted to be inherited magmatic monazite, but record no evidence of another high-T event prior to 1580 Ma. Most monazites from the region record only a single high-T metamorphic event at c. 1580 Ma. Zircon inheritance is very common. Zircons or narrow overgrowths of zircon dated at c. 1580 Ma have only been found in two types of rocks: rocks produced by metasomatic fluid flow at high temperatures (≤750°C), and rocks that have undergone local partial melting. Previous explanations that attributed these 1580 Ma zircon ages to widespread hydrothermal fluid fluxing associated with post-tectonic pegmatite emplacement at amphibolite facies conditions are not supported by the available evidence including oxygen isotope data. The observed high regional metamorphic temperatures require the involvement of advective heating. However, contrary to a previous tectonic model for the formation of this and other low-P, high-T metamorphic belts, the granites that are exposed at the present structural level do not appear to be the source of that heat, unless some of the granites were emplaced at c. 1580 Ma.     

大陆造山带元古宙构造体制研究的思路和方法探讨——以秦岭造山带为例

根据现代构造理论和大陆地质研究的新进展，以秦岭造山带为例，从稳定地块与造山带的结合、显生宙造山过程对元古宙构造体制的限制、元古宙地层划分对比、元古宙古构造环境分析的地球化学等方面研究入手，对造山带元古宙构造体制研究的思路和方法进行了初步探讨。     

Crustal thickening under the palaeo-meso-Proterozoic Delhi Fold Belt in northwestern India: evidence from deep reflection profiling

The results of deep reflection profiling studies carried out across the palaeo-meso-Proterozoic Delhi Fold Belt (DFB) and the Archaean Bhilwara Gneissic Complex (BGC) in the northwest Indian platform are discussed in this paper. This region is a zone of Proterozoic collision. The collision appears to be responsible for listric faults in the upper crust, which represent the boundaries of the Delhi exposures. In these blocks the lower crust appears to lie NW of the respective surface exposures and the reflectivity pattern does not correspond to the exposed blocks. A fairly reflective lower crust northwest of the DFB exposures appears to be the downward continuation of the DFB upper crust. The poorly reflective lower crust under the exposed DFB may be the westward extension of the BGC upper crust at depth. Thus, the lower crust in this region can be divided into the fairly reflective Marwar Basin (MB)-DFB crust and a poorly reflective BGC crust. Vertically oriented igneous intrusions may have disturbed the lamellar lower-crustal structure of the BGC, resulting in a dome-shaped poorly reflective lower crust whose base, not traceable in the reflection data, may have a maximum depth of about 50 km, as indicated by the gravity modelling.
The DFB appears to be a zone of thick (45-50 km) crust where the lower crust has doubled in width. This has resulted in three Moho reflection bands, two of which are dipping SE from 12.5 to 15.0 s two-way time (TWT) and from 14.5 to 16.0 s TWT. Another band of subhorizontal Moho reflections, at ≈ 12.5 s TWT, may have developed during the crustal perturbations related to a post-Delhi tectonic orogeny. The signatures of the Proterozoic collision, in the form of strong SE-dipping reflections in the lower crust and Moho, have been preserved in the DFB, indicating that the crust here has not undergone any significant ductile deformation since at least after the Delhi rifting event.     

胶东东部地区元古宙花岗岩类的地球化学及岩石成因

胶东东部地区的元古宙花岗岩－片麻岩杂岩，可分为：（１）石英闪长质－英云闪长质－花岗闪长质片麻岩、（２）二长花岗质－钾长花岗质片麻岩和（３）淡色花岗岩三套岩石。它们之间可识别侵位先后关系，岩相中普遍存在残留的斜长石板状晶体、并具环带结构为主的原生深成岩的矿物相组构，地球化学成分演化各具独立性，并具有深熔花岗岩的性质，结合同位素年龄资料，确立它们是元古宙不同造山阶段形成的花岗岩。岩石中普遍存在Ｔｉ、Ｙ、Ｓｒ、Ｎｉ及Ｍｇ等元素的强烈亏损，表明岩浆来源并非直接来源于上地幔或下地壳，它们是元古宙不同阶段已形成的岩石发生深熔作用形成的。这一认识有助于了解华北地台南缘东段元古宙这一重要地质时期的地壳形成和演化。     

Statistical analysis of spatial point patterns on deep seismic reflection data: a preliminary test

Spatial point patterns generated from bitmaps of images of processed reflection seismic profiles are analysed to quantify the reflectivity patterns. The point process characteristics for two different regions of a deep seismic reflection profile in northwestern Canada demonstrate that in both cases the points are not randomly distributed and that the point pattern distribution is different between the regions. The cluster effects for small point pair distances are stronger for the region of data where there is strong sedimentary layering than for the region where the layering is less distinct. As a result, it appears that future developments in point pattern analysis may provide a new tool for analysing spatial variations in reflection data.