中国东部陆缘中区第三纪构造-火山事件及其对含油气盆地的控制

中国东部陆缘中区第三纪主要发育5期构造-火山事件高峰，分别发生在58～46Ma、38～36Ma、26～24Ma、20～16Ma、8～4Ma。形成的火山岩岩性相对单一，主要为玄武岩，大量隐伏于新生代含油气断陷盆地中，这与裂谷作用有关，而野外露头区只发育古新世、中新世和上新世火山岩。研究表明，火山作用伴随着盆地发育的全过程。成盆早期的火山岩代表着裂谷作用的开始。成盆中期火山活动相对强烈，不但形成大量火山岩，而且也是盆地生油岩发育的主要时期。盆地形成后期火山作用微弱。新生代火山作用的中心往往成为成盆中心和油气聚集区。     

西北干旱区深层岩溶地下水系统的水化学-同位素研究--以宁南“南北古脊梁”岩溶水系统为例

运用构造控水分析、水化学同位素等方法，对宁南“南北古脊梁”岩溶裂隙水系统进行了深入的分析与讨论。本区储水空间以岩溶裂隙为主，岩溶水的空间分布明显受南北向大型断裂构造控制。岩溶地下水以大气降水起源为主，并表现为多元水混合。水质分布呈南优北劣的分带特征，北部水-岩相互作用形式为溶滤-蒸发浓缩型，呈高矿化咸水；南部为溶滤-混合型，呈低矿化淡水。根据水动力场和水化学场特征，划分了3个相对独立的岩溶水子系统。     

苏北榴辉岩中水晶的形成时代及其对超高压变质岩折返的示踪意义

江苏东海水晶以其晶体粒大和产量巨大而闻名，在地质上也因其产于高压超高压变质带而独具特色。在对大别—苏鲁超高压变质带的区域成矿作用进行研究和对中国大陆科学钻探工程(CCSD)主孔岩心进行编录的过程中，认识到超高压带存在着超低压成矿现象，包括中国最主要的水晶矿床成矿带在内的许多矿床都可能是在超高压变质之后退变质结束阶段的超低压环境中形成的，对水晶进行流体包裹体的Rb-Sr等时线年代学研究，获得208Ma的等时线年龄，表明成矿时代为印支期。该年代可视为超高压变质带折返并经历了退变质之后而“稳定”下来的时间。     

Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999——2001 in the northeast margin of Qinghai-Xizang block

Through numerical simulation for GPS data, aseism/c negative dislocation model for crustal horizontal movement during 1999-2001 in the northeast margin of Qinghai-Xizang block is presented, combined with the spatial distri-bution of apparent strain field in this area, the characteristics of motion and deformation of active blocks and their boundary faults, together with the place and intensity of strain accumulation are analyzed. It is shown that: a) 9 active blocks appeared totally clockwise motion from eastward by north to eastward by south. Obvious sinistral strike-slip and NE-NEE relative compressive motion between the blocks separated by Qilianshan-Haiyuan fault zone was discovered; b) 20 fault segments (most of them showed compression) locked the relative motion between blocks to varying degrees, among the total, the mid-east segment of Qilianshan fault (containing the place where it meets Riyueshan-Lajishan fault) and the place where it meets Haiyuan fault and Zhuanglanghe fault, more favored accumulation of strain. Moreover, the region where Riyueshan-Lajishan fault meets north boundary of Qaidam block may have strain accumulation to some degree, c) Obtained magnitude of block velocities and locking of their boundaries were less than relevant results for observation in the period of 1993-1999.     

深圳市东湖矿泉水形成机理探讨

深圳市东湖矿泉水是自然界十分稀少的锶—锌—偏硅酸碳酸复合型矿泉水，通过对矿泉水赋存地的地质与水文地质条件的分析，并结合其水文地球化学特征，认为东湖矿泉水形成的主要控制性因素是构造作用和变质作用；在特定的水文地质条件下，深部碳酸盐类岩石受热硅化变质而产生大量CO2气体，使得各种化学元素在含有大量CO2的地下水的溶滤作用下不断迁移和富集而形成该区地下水中良好的元素组合。在其特征成分中，偏硅酸来自裂隙渗透水的溶滤和岩浆期后热液水的作用，微量元素锶主要来源于钾长石、钙长石，锌则主要来自岩浆活动以及岩脉中的黑云母、角闪石、辉石等铁镁硅酸盐矿物；并认为目前矿泉水含水层仍处于良好的地质环境保护下。     

岩石断裂作用的复杂性和混沌动力学

断裂是一个复杂的动力学体系,受到岩石结构、反应、流体迁移、应力、岩石变形和力学等多种地质因素和过程的耦合控制。本文建立了断裂体系的反应-输运-力学耦合动力学模型并编制了模拟程序。以湖南水口山矿区为例,通过动力学模拟表明不同地层岩性的断裂渗透率大小和演化特征存在显著差异,断裂作用促使岩石渗透率的空间非均匀性增强,从而有利于流体的局部汇聚和矿体的形成。断裂中压力随时间呈现出非周期振荡变化,反映了断裂演化的混沌特征。     

从1∶25万DEM中提取地性线的研究

通过对1∶25万数据库的研究,提出一种从1∶25万数字高程模型(DEM)数据中提取地性线的方法,可用于计算机自动处理。     

东津-杭口盆地震旦、寒武系碳硅泥岩型铀、金矿化控制因素及定位条件浅析

本文论述了产于东津—杭口盆地震旦、寒武系碳硅泥岩型地层组合中的铀、金矿化严格受地层层位和构造迭加的联合控制，具体的赋矿部位就是两者定位条件复合最好的部位，并由此阐述了本区地质热事件的发育程度及其对本区铀、金矿化形成规模的影响。     

POSITIVE INVERSION STRUCTURE OF THE CENTRAL STRUCTURE BELT IN TURPAN-HAMI BASIN

The central structure belt in Turpan-Hami basin is composed of the Huoyanshan structure and Qiketai structure formed in late Triassic-early Jurassic, and is characterized by extensional tectonics. The thickness of strata in the hanging wall of the growth fault is obviously larger than that in the footwall, and a deposition center was evolved in the Taibei sag where the hanging wall of the fault is located. In late Jurassic the collision between Lhasa block and Eurasia continent resulted in the transformation of the Turpan-Hami basin from an extensional structure into a compressional structure, and consequently in the tectonic inversion of the central structure belt of the Turpan-Hami basin from the extensional normal fault in the earlier stage to the compressive thrust fault in the later stage. The Tertiary collision between the Indian plate and the Eurasian plate occurred around 55Ma, and this Himalayan orogenic event has played a profound role in shaping the Tianshan area, only the effect of the collision to this area was delayed since it culminated here approximately in late Oligocene-early Miocene. The central structure belt was strongly deformed and thrusted above the ground as a result of this tectonic event.     

西藏当惹雍错晚侏罗世-早白垩世扎列拿组、郎穷组和荣纳组的建立

通过1:25万邦多区幅地质调查,发现晚侏罗世-早白垩世则弄群中存在2个喷发-沉积不整合界面,将则弄群自然分成3个部分,对应3个火山喷发-沉积旋回.新创建扎列拿组、郎穷组和荣纳组.描述了3个组的定义及层型、次层型的岩性、岩相、古生物、同位素年代特征及其分布情况.