隐伏地质异常地表间接显示模拟的遥感地质统计分析

根据隐伏地质异常表面产是接显示模拟实验的结果,经遥感地质定量分析表明,隐伏地质异常在地表的间接显示信息是以线性体复杂模式在被动遥感图像上得以显示的。     

生命线工程震害对策的网络分析及实例

以某市供水管网为例,利用网络分析法对生命线工程进行分析,提出生命线工程中影响整个网络可靠性的关键元件,研究生命线工程的震害对策,提出已建城市生命线网络系统抗震加固的最优决策方案,以求用最小的投入达到最佳的减灾效益。结果表明,网络分析法能克服其它方法所带来的不完整性和人为因素大等诸多问题,也是生命线工程当前发展的必然趋势。     

苏北溱潼凹陷戴南组二段成岩作用与次生孔隙预测

成岩作用研究表明,戴南组二段成岩作用类型主要有机械压实、胶结、交代、溶解、粘土矿物充填等,并进行了各成岩作用对孔隙改造规模的统计。成岩作用阶段的划分,采纳了中华人民共和国石油天然气行业标准,将戴南组二段划分为早成岩Ｂ期和晚成岩Ａ期两个阶段。次生孔隙的发育、分布与泥岩压实曲线的紧密压实、大量脱水阶段或有机质的成熟阶段、生油门限以及混层粘土的第一迅速转化带有着密切联系,从而成为次生孔隙预测的着眼点。     

天山后碰撞阶段构造演化的新信息——来自阿吾拉勒山中段动力变质岩的证据

中国大山阿吾拉勒成矿带形成于石炭纪—二叠纪裂谷地质背景之上,其中段已发现著名的式可市台富铁矿床以及伴生的一系列铜矿点,成矿围岩为浅变质岩系。笔者根据近年研究,确定该含矿岩系实际是区域性挤压构造形成的动力变质岩带,其中云母片岩的绢云母经~(40)Ar/~(39)Ar定年,获得坪年龄220.6±3.4Ma和等时线年龄220.7±6.6Ma。这一成果揭示天山山脉在后碰撞地壳演化阶段,经历了晚三叠世构造热事件的改造。     

Zonal Metamorphic Complex in the Tongulack Mountain Ridge, Altai, Russia, and Explanation of Its Origin with the Help of Thermal Modelling

A moderate pressure / high temperature zonal metamorphic complex in the Tongulack Mountain Ridge, Altai, Russia, is described, and the applicability of the models of magmatic intrusion and fluid flow to explanation of its origin discussed. The Precambrian complex was formed at 500-700℃ and 3.0-5.5 kbars; it is a linear, 25-30 km wide, thermal anticline with a curved axis showing symmetric metamorphic zoning. The metamorphism was isochemical by its nature, as is corroborated by the chemical compositions of the rocks. Four zones can be recognized within the metamorphic complex: chloritic (on the peripheries), cordieritic, sillimanitic and staurolite-out (in the centre). The zones are separated by successive isograds: cordierite, staurolite-in or sillimanite and staurolite-out. It is argued that the origin of the metamorphic zoning can be explained best by a combined fluid-magmatic model; conductive heat flow from the intrusion predominated considerably over the fluid flux in heat transfer: the fluid flow     

Meso-Cenozioc Tectonic Attribute of Southern China and Folding of the Nanhua (South Cathay) Orogenic Belt

The Meso-Cenozoic tectonic attribute of southern China is a continental tridirectional orogenic belt formed by subsynchronous interaction among the Tethys, Northwest Pacific and Kunlun-Qinling tectonic domains. It was created by superimposition of repeated orogenies since the Late Permian. The Indosinian folds therein are gentle and localized.     

Rheological Properties of Mantle Peridotites at Yushigou in the North Qilian Mountains and Their Implicationsfor Plate Dynamics

This paper discusses in detail the deformation textures, glide system, petrofabrics and olivine dislocation microstructures of mantle peridotites at Yushigou in the North Qilian Mountains, northwestern China. The peridotites have undergone high-pressure, high-temperature and low-strain rate plastic flow deformation. According to the dynamic recrystallized-grain size of olivine and the average spacing between the dislocation walls as well as the chemical composition of enstatite, the authors calculated the rheological parameters of the ancient upper mantle in the study area as follows: temperatures 1025-1093℃; pressures 3043-4278 MPa; depths 95-132 km; deviatoric stress 28-32 MPa; strain rates 0.2×10-14-2.13×10-14s-1 and equivalent viscosities 0.45×1020-4.65×1020 Pa · s. These parameters suggest that the position where plastic flow took place was correspondent to the low-velocity zone beneath the oceanic lithosphere and that oceanization characterized by middle-velocity (1-3 cm/a) sea-floor spreadi     

Organic/ Inorganic Occurrence of Metallic Elements of the Black Shale-Hosted Baiguoyuan Silver-Vanadium Deposit in Xingshan, Hubei

By means of kerogen purification, the proton induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA), the authors have studied the organic/inorganic occurrence modes of the metallic elements of the Baiguoyuan silver-vanadium deposit hosted in black shale in Hubei Province, China. The result shows that Au, Hg and Ta have a strong tendency to occur organically, with more than 70% of these elements being associated organically. Se, Ga, Ag and Hf are partly associated with organic matter, with more than 20% of them occurring organically. Compared with the above elements, Zn, Cu, As and Sb are weakly associated organically, and tend to be enriched in kerogen. However, Mn, Th, U, V, Co, Cr, Al, Fe and Sc usually occur inorganically. Of the rare earth elements (REE), La, Ce, Tb, Dy, Yb and Lu have stronger ability to be associated with organic matter than Sm and Eu.     

Regional Environmental Differentiation in China Sincethe Mid-Pleistocene Inferred from Lake Recordsand Its Relation with East Asian Monsoons

Comparative study of long lake records in different regions in China can provide some significant information about the regional differentiation of the environment and Asian monsoon activities. However, intensively studied lacustrine cores with a span of a few hundred thousand years are very rare in China. The available examples are only three long cores from the Zoige basin in the eastern Qinghai-Tibet plateau, the Qaidam basin in the northern Qinghai-Tibet plateau and the Dianchi basin in the Yunnan plateau respectively. The results show that the regional environmental differentiation since the Mid-Pleistocene involved three stages, i.e. 780-480, 480-160, 160-0 ka B.P. In each of the three stages different regions of China had their own distinctive environmental characteristics, indicating that the uplift of the Qinghai-Tibet plateau played a major role in the environmental differentiation process.     

试论残留型盆地研究思路和油气勘探方法

残留型地具有抬升剥蚀剧烈,原形盆地难以恢复,经历多期构造运动的改造和建造油气成藏动力学过程复杂,热演化程度较高,油气保存条件复杂等特点,但是残留型盆地油气资源丰富,勘探前景广阔,依据残留型盆地的特征和油气资源潜力,提出应全面,发展地认识盆地,静动结合地研究盆地,运用先进而实用的新技术新方法评价盆地,按照勘探程序勘探盆地,在研究工作上应以分地及其邻区作为整体研究对象,以区域地质研究一石油地质研究－综