四川盆地基底及深部地质结构研究的进展

根据对近年来区域地质、多种地球物理资料和深钻井资料的综合研究，认为四川盆地属扬子板块，岩石圈巨厚，最厚可达２００ｋｍ。川西高原属青藏板块的东缘，同时位于中国南北构造带中段，软流圈呈北东向上隆，岩石圈减薄，其最薄处厚度约７０ｋｍ左右。四川盆地的基底由结晶基底与沉积岩变质基底组成，上震旦统为该地区在扬子古板块形成后的第一套沉积盖层。基底的性质、厚度、埋深在不同地区各不相同，从而决定了盆地内部构造区的划分。基底深断裂对盆地的形成与盖层构造的发展也有重要的控制作用。     

北祁连早古生代大地构造演化

早古生代北祁连是一个陆间微洋盆。震旦纪时,北祁连开始从华北板块中解体出来。主要裂谷作用发生于寒武世。北祁连地槽主要闭合期为晚奥陶世和早、中志留世。晚志留世和早泥盆世经历了复杂的消减作用。     

渭河盆地东部地区的活断层

本文根据近年来的调查结果,讨论了渭河盆地东部地区六条主要断裂的活动情况。指出这些断裂现今活动以倾向滑落为主,同时兼有一定分量的左旋走滑运动     

Organic geochemical characteristics of sediments from the anoxic brine-filled Tyro basin (eastern Mediterranean)

Soxhlet-extractable organic compounds of sediments from the anoxic brine-filled Tyro basin (eastern Mediterranean) were analyzed by gas chromatography and gas chromatography-mass spectrometry. Cholesterol and 22,29,30-trisnorhopan-21-one are the major compounds identified. The occurrence of this triterpenoid ketone, as well as 22,29,30-trisnorhop-6-en-21-one and diplopterol (both tentatively identified), is ascribed to an input of microbiota living at the brine-seawater interface.     

内蒙古中西部多岛海构造演化

内蒙古中西部大陆由一个微大陆、三条弧后盆地和三条火山岛弧,即华北微大陆、白云鄂 傅弧后盆地、白乃庙火山岛弧、温都尔庙弧后盆地、苏尼特左－锡林浩特火山岛弧、贺根山弧后盆 地和二连浩特－锡林郭勒火山岛弧组成。经过了长期而复杂的微大陆和火山弧的裂解、弧后盆地 的消减衰亡及弧－陆和弧－弧碰拉等构造演化,才最终形成今天所见到的这种构造样式。     

苏北箕状断陷形成的动力学机制

苏北盆地由多个小型箕状盆地组成,过去一直用“拉线作用”和“裂谷盆地”理论解释其成因,但大量地震资料显示,新生界地层“楔状实体”的形成除沉积因素外,更主要的是因为多次不均衡抬升削蚀所造成,实际是一个早第三纪残留盆地。新生代构造现象既是中生代时期构造作用的延续,也是始新世以来复杂应力环境作用的结果。印支－燕山中期,中国东部只受到太平洋－库拉板块一种力源作用,地层形变强烈,受力方向单一,以NW,NWW向挤压或左行剪切为主,发育了大量逆冲推覆构造,始新世,由印度板块向欧亚大陆冲撞引发的NE向挤压力加入到本区,使苏北盆地从此处在因两大板块非均速推进而产生的二元交变动力环境：印度板块力源占主导时,产生“右旋扭动”力偶,使燕山早－中期逆断层复活反转的同时,由于中国西部大陆的不断抬升,本区总的以沉积作用为主,而太洋板块力源占主导时又产生“左行剪切挤压”,在整体抬升基础上,斜坡－凸起处的过多蚀进一步加强了箕状盆地结构。两种力源的时空交替实际形成了一个完整的“断－坳－隆”沉降－抬升构造旋回,利用裂变途径迹资料探讨了不同方向构的形成年代。     

镇旬盆地金矿成矿规律研究

文章总结了镇旬盆地金鸡岭复式向斜南北两带金矿的成矿条件、成矿规律、成矿模式、找矿标志,分析复式向斜南北两翼的成矿条件,认为运用北带的成矿规律、成矿模式、找矿标志可以指导在南带及其他地区微细浸染型金矿床的找矿工作.     

断陷湖盆碳酸盐与陆源碎屑混合沉积——以东营凹陷金家地区古近系沙河街组第四段上亚段为例

混合沉积是一种特殊的沉积类型,研究程度较低。金家地区处于东营凹陷的斜坡带,该区古近系沙河街组第四段上亚段发育了碳酸盐与陆源碎屑的混合沉积,研究认为该混合沉积为古湖泊内的混合沉积,可划分为混积砂滩亚相、混积砂坝亚相及半深湖混积亚相,混合沉积物既包括同层混合沉积物（灰质砂岩、砂质灰岩、泥质灰岩等）,又包括互层混合沉积物（砂岩与颗粒灰岩互层沉积等）,研究区的混合沉积受当时构造运动、碎屑物质供给量、湖平面的变化等诸多因素控制。     

Research on runoff variations based on wavelet analysis and wavelet neural network model: A case study of the Heihe River drainage basin (1944?2005)

The Heihe River drainage basin is one of the endangered ecological regions of China. The shortage of water resources is the bottleneck, which constrains the sustainable development of the region. Many scholars in China have done researches concerning this problem. Based on previous researches, this paper analyzed characteristics, tendencies, and causes of annual runoff variations in the Yingluo Gorge (1944–2005) and the Zhengyi Gorge (1954–2005), which are the boundaries of the upper reaches, the middle reaches, and the lower reaches of the Heihe River drainage basin, by wavelet analysis, wavelet neural network model, and GIS spatial analysis. The results show that: (1) annual runoff variations of the Yingluo Gorge have principal periods of 7 years and 25 years, and its increasing rate is 1.04 m3/s·10y; (2) annual runoff variations of the Zhengyi Gorge have principal periods of 6 years and 27 years, and its decreasing rate is 2.25 m3/s·10y; (3) prediction results show that: during 2006–2015, annual runoff variations of the Yingluo and Zhengyi gorges have ascending tendencies, and the increasing rates are respectively 2.04 m3/s·10y and 1.61 m3/s·10y; (4) the increase of annual runoff in the Yingluo Gorge has causal relationship with increased temperature and precipitation in the upper reaches, and the decrease of annual runoff in the Zhengyi Gorge in the past decades was mainly caused by the increased human consumption of water resources in the middle researches. The study results will provide scientific basis for making rational use and allocation schemes of water resources in the Heihe River drainage basin.