冀北早白垩世火山—沉积作用及构造背景

根据火山岩Rb—Sr等时线测年结果，将张家口组置于下自垩统下部。讨论了早自垩世139～138Ma左右的张家口组和120Ma左右的化吉营组2期火山岩的组分特征和岩浆来源，认为它们的成因与底侵作用引起的下地壳部分熔融有关，与该区发现的140—120Ma麻粒岩包体所反映的底侵作用一致。从火山—沉积作用相互联系的角度，可以将这2期火山岩和它们各自上覆的沉积地层看做上、下2个火山—沉积旋回。下部的火山断陷盆地和上覆的沉积坳陷盆地组成了二元结构的盆地。沉积盆地的特征、火山岩的成因及同期麻粒岩的存在，总体反映了晚中生代伸展背景下的构造热体制。     

基于InVEST模型的张家口地区水源涵养功能研究

水源涵养是生态系统提供的最重要的功能之一,开展水源涵养功能评价对了解地区水环境、合理发展分区管理有重要意义.张家口作为京津重要的水源地与生态屏障,承担着维护区域经济可持续发展与生态环境质量改善的关键任务,深入探究其水源涵养现状具有现实意义.然而,当前针对张家口实际降雨强度与地表覆被等特征开展的水源涵养功能研究与探讨仍较...     

张家口市防震减灾宣传工作的特点和对策

本文总结了近年来张家口市防震减灾宣传工作的特点和对策。防震减灾是一项社会公益事业,涉及到各行各业,需要全社会的理解和大力支持,希望社会各界都来关注、参与防震减灾工作。     

张家口—蓬莱断裂带的分段特征

张家口－蓬莱断裂带是华北地区一条重要的北西向地震构造带。根据近年来的研究结果，将断裂带分为4段：张北－南口段、南口－宁河段、渤海段和蓬莱－烟台段，各段具有不同的几何学和运动学特征。同时，对断裂带内北西向断裂和北东向断裂的关系进行了讨论。     

近场精确定位在卢龙MemLsub6.2地震发震构造研究中的应用

从1982年10月19日卢龙6.2级地震余震近场数字地震资料的391条记录中， 挑选出可用于精确定位的171条地震事件记录，采用Hypoinverse定位方法对45个事件进行了重定位. 精确定位的震中分布显示出一卧倒的反ldquo;Frdquo;形活动地震构造的形态， 两条NNE向断裂被一条WNW向断裂所截断，两组断裂呈脆性断裂常见的共轭状态产出， NNE向的断层正在相互贯通，卢龙附近的滦河河谷发育成了四面断裂包围的断陷盆地雏形. 卢龙地震的发震构造是一个走滑兼张性的断裂组合， 这样的构造与张家口——渤海地震带的整体活动习性相符， 也反映了张渤带作为一个二级地块的分界截断NNE向的一系列断层所起的作用.      

张家口下花园青白口系下马岭组灰质页岩热模拟实验

华北地区中上元古界地层烃源岩的有机质热演化普遍处于高成熟－过成熟阶段，而张家口下花园青白口系下马岭组页岩和灰质页岩的Rb仅有0.38-0.6%，处于低成熟阶段，是系统研究中上元古界地层的生烃模式及有机质热演化特征的较理想模拟实验样品。本次模拟结果表明：模拟温度在275℃以前（R0＜0.80%)为低成熟阶段，275℃－350℃（R0为0.8-1.32%）为成熟阶段；其中325℃（R0为1.16%)为生油高峰，350℃（R0为1．32％）为轻质油高峰，350℃－410℃（R0为1．32－2．0％）为高成熟阶段，410℃以后（R0＞2．0％）为过成熟阶段。随着温度升高，生成的烃类和干酪根碳同位素（δ^13)逐渐变重，验证了δ^13C存在温阶效用。在过成熟阶段，可溶有机质亦发生了芳核的缩聚反应，使芳烃含量减少，大分子的沥青质含量增多。可溶有机质在高成熟－过成熟阶段有“逆转”现象，正构烷烃碳数分布出现了双主峰，高碳数部位出现了奇偶优势等特征。当Rb>0.81％以后，同一温度点为Rb%>R0%。无水与加水模拟实验对比表明，加水实验的液态烃产率高，液态烃中重组分相对含量多，说明无水实验中热裂解反应强烈，而加水实验更接近地层热演化条件。     

Helium and argon isotopes in spinel lherzolite from Damaping, northern Zhangjiakou

Spinel lherzolite found in Damaping, northern Zhangjiakou, Hebei Province occurs as xenoliths in the Hannuoba basalts that consist of alkali basalt and tholeiite. Spinel lherzolites contain 50%–70% olivine (Fo: 90%), 10%–20% clinopyroxene (predominantly Di), 10%–30% orthopyroxene (predominantly En), and less than 5% spinel.³He/⁴He and⁴⁰Ar/³⁸Ar ratios in the olivine are 7.56×10⁻⁷ and 299.1, respectively.³He/⁴He and⁴⁰Ar/³⁸Ar ratios in the orthopyroxene (enstatite) are 9.1×10⁻⁷ and 307, respectively. Olivine grains are fractured irregularly, and pyroxene grains characterized by well developed cleavages, which would have resulted from explosion during the rapid eruption of lava from the deep interior to the surface. The lower isotope ratios of helium and argon may indicate that the spinel lherzolite xenoliths were derived from the strongly degassed and depleted upper mantle, and that the mantle is inhomogeneous.³He losses to some extent might affect the helium isotope ratios. The project was financially supported by the National Natural Science Foundation of China (No. 49273185).     

Temporal and spatial distribution of Au-Ag polymetallic ore deposits and source of oreforming materials in the ZhangjiakouXuanhua mantle-branch metallogenetic zone

The Zhangjiakou-Xuanhua area is a mineral resource-concentrated area for gold-silver polymetallic ore deposits. The temporal and spatial distribution and origin of mineral resources have been argued for a long time. Based on the comprehensive studies of geochronology and sulfur, lead, oxygen, carbon and noble gas isotopes, it is considered that the temporal and spatial distribution of mineral resources in this area is obviously controlled by the Zhangjiakou-Xuanhua mantle branch structure, as is reflected by the occurrence of gold deposits in the inner parts and of Ag-Pb-Zn polymetallic ore deposits in the outer parts. The mineralization took place mainly during the Yanshanian period. Ore-forming materials came largely from the deep interior of the Earth, and hydrothermal fluids were derived predominantly from Yanshanian magmatism.     

Zircon U-Pb Ages of Bottom and Top Parts of the Zhangjiakou Formation in Lingyuan Area （West Liaoning Province） and Luanping Area （North Hebei Province） and Their Significance

Thecharacteristicsofthetectonics,stratigraphy, paleontologyandvolcanicpetrologyoftheMesozoicin NorthHebeiandWestLiaoningaresimilarinmanyas pects,butthetworegionsalsohavesomeobvious differences.Thetworegionshavebeen“hotspots”inthegeologicalworldforafewy…     

内蒙古锡林郭勒盟多伦地区张家口组首次发现的碱性火山岩及其地质意义

笔者首次在张家口组火山沉积地层中发现了碱性火山岩。在最近成果整理过程中又补做了一些矿物学的测试工作，较详细地研究了该套碱性火山岩的碱性矿物组合特征，其中碱性矿物有：霞石（？）、霓石、霓辉石、镁钠闪石、钠长石、透长石及歪长石等。该套碱性火山岩的发现不但丰富了张家口组火山岩的岩石类型，而且深刻地影响着该区大地构造环境的研究，可能反映了大陆裂谷构造背景。