Coal-generated oil in Tuha Basin     

Keming Cheng  Aiguo Su  Changyi Zhao  Zhonghua He 《中国科学D辑(英文版)》1997,40(4):439-442

The Turpan-Harmi (abbreviated to Tuha below) Basin is a typical basin of coal-generated oil accumulation in China. The Middle-Lower Jurassic coal measures are considered the main source beds. Hence, both desmocollinite and suberinite are considered the contributors for coal-generated oil. Principal geochemical features of the crude oil in the Tuha Basin are rich in alkanes (70%—80%), high pristane/phytane ratio (6—8), abundant heavy carbon isotope (δ¹³C PDB= -26%–-23%) and absolute GP sterane predominance. The hydrocarbon generation process from the coal series is characterized by multistages, early generation and early expulsion.  相似文献   

云南岩石圈热结构   总被引：11，自引：0，他引：11  

周真恒  邓万明 《中国地震》1997,13(3):213-222

本文探讨了云南深部热流及岩石圈地温分布的横向变化特征，并将岩石圈热结构概括为３种类型；典型现代构造活动区热结构，中间过渡型地质区热结构和稳定地质区热结构。最后，简单讨论了地热与地震活动的关系。  相似文献   

地质样品中微量金银的在线分离富集方法     

齐菊锐  苏克  邹海峰  鲍长利  姜桂兰  齐清凤 《吉林大学学报(地球科学版)》1997,(4)

提出用ＶＳ－Ⅱ型强碱性阴离子交换纤维定量富集、硫脲解脱，流动注射在线分离富集—火焰原子吸收光谱法测定地质样品中痕量金银的分析方法。该方法检出限低，金为１．４μｇ／ｍＬ，银为０．３５μｇ／ｍＬ，相对标准偏差均小于２％，采样频率为１２０次／ｈ，用于地质样品中痕量金银的直接测定，结果令人满意。  相似文献   

老黑山火山碎屑降落堆积物研究   总被引：7，自引：0，他引：7  

刘祥 《沉积学报》1997,15(1):71-76

由中心式喷发形成的老黑山火山碎屑降落堆积物，主要是玄武质火山渣、火山弹、火山饼和少量岩屑。在火山爆发自身能量和北北西风的影响下，形成高耸的火山渣锥和向南南东展布的低缓的火山碎屑席地貌景观。区域上系统测量了火山碎屑席中火山碎屑的厚度、最大平均粒径、分选系数和中值粒径，均呈现规律性变化；剖面层序则反映老黑山火山经过两个大喷发阶段，多次脉动式喷发。经估算，老黑山火山碎屑席中火山碎屑量比火山渣锥中要少得多，老黑山火山碎屑属“建造火山锥”火山碎屑沉积。据投点，老黑山火山喷发属斯通博里型。老黑山、火烧山火山仍有再次爆发的可能。未来火山喷发的潜在危险主要来自火山喷发空落堆积物。老黑山、火烧山火山的南东、东和南，包括五大连池市在内有必要对未来火山爆发加以防范。  相似文献   

闽西北常口—南舟断裂带与萤石成矿关系     

傅树超  苏江湖 《福建地质》1997,16(4):170-175

福建省区域地质调查队三分队在元坑幅及埔上幅１：５万区调中分别发现了将乐常口大型萤石矿和顺昌南舟萤石矿。两个矿床均位于常口－南舟北东向断裂带中，受其次级张性断裂直接控制，矿床成因类似。  相似文献   

成都粘土裂隙成因研究   总被引：1，自引：0，他引：1  

赵翔 《地质灾害与环境保护》1997,8(4):40-46

根据成都粘土中裂隙特征与地质环境条件的分析，提出成都粘土中途中眩要裂隙类型的成因模式，上升剥蚀引起的垂向卸荷作用产生波状水平裂隙，冲沟切割引起的侧向卸荷作用，产生平行斜列隙裂。  相似文献   

Seismotectonic environment of occurring the February 3, 1996 Lijiang M=7.0 earthquake, Yunnan Province     

HAN  Zhu-jun 《地震学报(英文版)》2004,17(4):453-463

Lijiang-Daju fault, the seismogenic fault of the 1996 Lijiang M=7.0 earthquake, can be divided into Lijiang-Yuhu segment in the south and Yuhu-Daju segment in the north. The two segments show clear difference in geological tectonics, but have the similar dynamic features. Both normal dip-slip and sinistral strike-slip coexist on the fault plane. This kind of movement started at the beginning of the Quaternary (2.4～2.5 Ma B.P.). As to the tectonic types, the detachment fault with low angle was developed in the Early Pleistocene and the normal fault with high angle only after the Mid-Pleistocene (0.8 Ma B.P.). Based on the horizontal displacements of gullies and the vertical variance of planation surfaces cross the Lijiang-Daju fault at east piedmont of Yulong-Haba range, the average horizontal and vertical slip rates are calculated. They are 0.84 mm/a and 0.70 mm/a since the Quaternary and 1.56 mm/a and 1.69 mm/a since the Mid-Pleistocene. The movements of the nearly N-S-trending Lijiang-Daju fault are controlled not only by the regional stress field, but also by the variant movement between the Yulong-Haba range and Lijiang basin. The two kinds of dynamic processes form the characteristics of seismotectonic environment of occurring the 1996 Lijiang earthquake.  相似文献   

The down-faulted basin zone and high disaster risk zone in Shanxi Province, China     

刘惠敏  苏桂武  邓砚  高庆华 《地震学报(英文版)》2004,17(4):490-499

Introduction Since 1920s, with increasing awareness of disaster prevention and reduction in various as-pects and gradually deepened development of International Decade for Natural Disaster Reduction (IDNDR) activities in China, the role and position of disaster risk analysis and risk management work are increasingly prominent. In the final report of the IDNDR activities in 1999, the Science and Technology Committee of IDNDR had presented 5 challenge fields, which the international dis…  相似文献   

Seepage driving effect on deformations of San Fernando dams   总被引：2，自引：0，他引：2  

Xiang Song Li  Haiyan Ming   《Soil Dynamics and Earthquake Engineering》2004,24(12):979-992

In the process of flow deformation of an earth dam, the seepage force inside the dam plays a role as a driving force. The seepage force acts just like the gravitational force in terms of pushing soils away from their original locations after liquefaction is triggered. This paper draws attention to this seepage driving effect by presenting a set of fully coupled finite element analyses on the well-known San Fernando dams, with the objective of evaluating the impact of this seepage effect. The results indicate that while this effect is always there, its practical significance depends on a number of factors. In the case of the upper San Fernando dam, which experienced a significant, but restricted, downstream movement during the 1971 earthquake, the seepage driving effect was indeed significant. On the contrary, for the lower dam, which failed and slid into the upstream reservoir during the same earthquake, this seepage effect was relatively less pronounced. The detailed results of the analyses reveal the likely mechanisms of failure and deformation of the two dams and the likely cause behind the difference between their responses during the earthquake.  相似文献   

深圳湾公路大桥设计风速的推算   总被引：5，自引：2，他引：5       下载免费PDF全文

陈正洪向玉春  杨宏青毛夏  张小丽周新 刘晓东 《应用气象学报》2004,15(2):226-233

从资料的完整性和合理性、方法的规范性等几方面着手，对深圳湾公路大桥设计风速进行推算。利用深圳市气象站1954～2001年逐年年最大风速资料，通过时距、高度、地形等订正后得到相当于开阔平地上方10 m高度10 min年最大风速48年序列，使之符合建筑抗风指南或规范的要求。再利用极值Ⅰ型计算出不同重现期的基本风速，同时用耿贝尔的参数估算法和修正后的矩法参数估计法计算出不同重现期（200、120、100、60、50、30、10年）的基本风速。研究发现桥位区自动气象站与深圳市气象站最大风速正相关显著，前者是后者的1.1倍，从而可将基本风速外推到桥位区，进一步根据规范将该值放大1.11/2（1.049）倍至海面上，最终得到设计风速。还利用近地层风的指数和对数曲线推算出150 m内每10 m高度层的最大风速。  相似文献