三维构造模拟方法--体平衡技术研究

为了实现三维构造史模拟,在二维平衡剖面技术的基础上,提出了适用于在维构造模拟的方法－体平衡技术,其核心是通过分析断层演化及地层变形在三维空间中的特殊性,建立三维复杂构造的数学模型和三维物质平衡方法,它简化了平衡时三维的体积计算和对不平衡体积构造体的适应性,从而减少了三维构造模拟的实现难度。     

黑龙江省漠河地区火山岩特征及金矿化

漠河地区火山岩分布较广泛,共有３期火山活动。以中基性岩为主,夹有中酸性岩,目前已发现４处与中酸性火山活动有关的岩金矿（化）点,产出受ＮＮＥ,ＮＥ向及环形断裂控制,成矿时代为燕山晚期,属澡－低温火山热液型。     

含铁绿柱石的改色机制研究

含铁绿柱石经γ射线辐照或特定温度热处理,可因铁价态的改变引起颜色发生相应变化。处理前后的吸收光谱和顺磁共振谱研究表明,辐作用使隧道位的Ｆｅ＾２＋氧化Ｆｅ％３＋,八一位上的Ｆｅ＾３＋还原为Ｆｅ＾２＋,热处理使隧道位及八面体位Ｆｅ＾３＋均还原为Ｆｅ＾２＋。     

石生藻类,地衣,苔藓与碳酸盐岩持水性及生态意义

对藻类,地衣,芭藓生物财溶校样品及相应岩石样品进行了室内蒸发失水,主动吸水试验,结果表明：与无生物覆盖的岩石相比,有藻类生物覆盖的岩石表面失水量,吸水量分别提高１８．８,１．６倍,蒸发失水,主动吸水的时间分别延长４８％,５７％,持水量提高１６．６倍,有地衣生物覆盖的岩石表面失水量,吸水量分别提高２．９,１９．１倍,蒸发失水,主动吸水的时间分别延长３１％,１１９％,持水量提高２．９倍;有苔藓生物覆盖     

长江三峡巴东县黄土坡前缘斜坡变形数据本构分析预测研究

应用数据本构分析方法,对三峡库区巴东县黄土坡前缘斜坡变形发展趋势进行了分析预测,阐明了数据本构分析预测对斜坡地质灾害的分析、防治意义     

Geological, geochemical characteristics and isotope systematics of the Longqiao iron deposit in the Lu-Zong volcano-sedimentary basin, Middle-Lower Yangtze (Changjiang) River Valley, Eastern China

The Middle-Lower Yangtze (Changjiang) River Valley metallogenic belt is located on the northern margin of the Yangtze Craton of eastern China. Most polymetallic deposits in the Changjiang metallogenic belt are clustered in seven districts where magmatism of Mesozoic age (Yanshanian tectono-thermal event) is particularly extensive. From west to east these districts are: E-dong, Jiu-Rui, Anqing-Guichi, Lu-Zong, Tong-Ling, Ning-Wu and Ning-Zhen. World-class iron ore deposits occur in the Lu-Zong and Ning-Wu ore clusters, which are mainly located in continental fault-bound volcanic-sedimentary basins. One of these deposits is the Longqiao iron deposit, discovered in the northern part of the Lu-Zong Basin in 1985. This deposit consists of a single stratabound and stratiform orebody, hosted in sedimentary carbonate rocks of the Triassic Dongma'anshan Formation. A syenite pluton (Longqiao intrusion) is situated below the deposit. The iron ore is massive and disseminated and the ore minerals are mainly magnetite and minor pyrite. Wall rock alteration mostly consists of skarn minerals, such as diopside, garnet, potassic feldspar, quartz, chlorite, phlogopite and anhydrite. Thin sedimentary siderite beds of Triassic age occur as relict laminated ore at the top and the margin of the magnetite orebody. These sideritic laminae are part of Triassic evaporite-bearing carbonate deposits (Dongma'anshan Formation).Sulfur isotopic compositions show that the sulfur in the deposit was derived from a mixture of magmatic hydrothermal fluids and carbonate–evaporite host rocks. Similarly, the C and O isotopic compositions of limestones from the Dongma'anshan Formation indicate that these rocks interacted with magmatic hydrothermal fluids. The O isotopic compositions of the syenitic rocks and minerals from the deposit show that the hydrothermal magnetite and skarn minerals were formed from magmatic fluids. The Pb isotopic compositions of sulfides are similar to those of the Longqiao syenite. Phlogopite coexisting with magnetite in the magnetite ores yielded a plateau age of 130.5 ± 1.1 Ma (2σ), whereas the LA-ICP MS age of the syenite intrusion is 131.1 ± 1.5 Ma, which is slightly older than the age of phlogopite.The Longqiao syenite intrusion may have crystallized from a parental alkaline magma, generated by partial melting of lithospheric mantle, during extensional tectonics. The ore fluids were probably first derived from magma at depth, later emplaced in the sedimentary rocks of the Dongma'anshan Formation, where it interacted with siderite and evaporite-bearing carbonate strata, resulting in the formation of magnetite and skarn minerals. The Longqiao iron deposit is a skarn-type stratabound and stratiform mineral system, genetically and temporally related to the Longqiao syenite intrusion. The Longqiao syenite is part of the widespread Mesozoic intracontinental magmatism (Yanshanian event) in eastern China, which has been linked to lithospheric delamination and asthenospheric upwelling.     

汞元素的石油地质意义

油气中都含有汞元素组分,汞的物理化学性质决定其可以从油气藏中向上垂向运移,根据采样介质类型及样品预处理的手段不同,地表中汞的分析方法可分为壤气、热释汞及土壤总汞分析方法.壤气汞、热释汞及土壤总汞指标都有着很好的示油气意义,同时也有着示断裂带的地质意义.     

动载荷作用下岩石破坏过程的数值试验研究

采用基于细观损伤力学基础上开发的动态版RFPA2D数值模拟软件,对动载荷作用下应力波延续时间、应力波峰值和围压对岩石试样破坏的影响进行了数值研究,结果表明,应力波延续时间较短,则尾随应力波波前的高应力区范围较窄,应力波衰减较快;相反,应力波延续时间较长,则紧跟应力波波前的高应力区范围较大,岩石处于破坏状态的时间延长,岩石的破碎程度加大。此外,存在一个合适的应力波延续时间,过分地加大应力波延续时间,反而不利于岩石裂隙的发育。动载荷的峰值越大,试样的破坏程度越大,当峰值达到一定值时,试样顶部呈现粉碎状,试样从上到下破坏程度逐渐减弱。在冲击载荷作用下的岩石随着围压的增加更难破碎,但当围压增大到一定程度时,岩石会突然失稳破坏。     

基于GIS的铁路地质环境多源信息管理研究——以西南地区某铁路为例

从构建铁路地质环境多源信息管理系统的必要性人手,针对目前铁路工程地质勘察与地质灾害空间多源信息管理的不足,以ArcGIS软件为应用平台,以VBA为开发工具,采用定制ArcMap的方法进行二次开发。对铁路地质环境涉及的基本内容,以及如何构建基于GIS的铁路地质环境多源信息管理系统等作了探讨。     

新疆罗布泊盐湖卤水资源综合开发研究

罗布泊盐湖赋存有丰富的含钾硫酸镁亚型卤水,现已探明仅罗北凹地区段孔隙度储量2.67×109 t(折合KCl),属特大型钾盐卤水矿藏,是生产硫酸钾的理想原料;此外,卤水中含有丰富的钠、镁、锂、硼等资源,综合回收利用价值较大.本文针对罗布泊盐湖卤水资源,在有效利用盐湖钾资源同时,加快其他共生资源的综合开发进程,将新疆罗布泊盐湖资源开发建设推向持续、合理、有效、高值的循环经济发展的道路,为国家西部经济开发做出贡献.