不同温度围压下几种油砂超声波性质的实验测量

在不同温度围压下测试了几种油砂超声波性质.研究了不同油砂样品波速的温度压力依赖性.     

莱西市基岩裂隙水赋存规律及开发利用浅析

近年来,由于降水偏少,山东省莱西市水资源供需矛盾加剧.为解决群众饮水困难、支撑服务区域经济社会发展,山东省自然资源厅启动了多幅1∶5万区域水文地质调查项目.本文依托山东省1∶5万区域水文地质调查项目(夏甸、日庄幅),在水文地质调查和探采结合井实例的基础上,初步查明并汇总了莱西市基岩裂隙水的主要蓄水构造类型以及赋存规律,...     

蒙皂石—乙二醇有机复合体结构模型修正

通过对一例蒙皂石－乙二醇有机复合体的结构研究,修正了传统的结构模型,并从化学键、有机分子模型及层间域的有效空间等方面综合考虑,证明了所提出的新结构模型的合理性。在新的结构模型中,乙二醇分子为梯形排列。单位晶胞所容纳的乙二醇分子为４个,每个乙二醇分子与可酸盐层基底形成两个氢键,并且乙二醇分子的构型显示了极性分子的性质,层间域Ｃａ离子和剩余水分子正对于六方网环的中心,与另一例的乙二醇分子相对应,新结构     

张家口地区张家口组火山岩元素地球化学特征及成因

针对张家口该地区张家口组火山岩的主量元素和微量元素高精度分析测试,结果显示:该套流纹岩和粗面岩具有富铁,高钾和全碱,富集REE,Rb,Th,U,Zr,Ga等不相容元素,Nb,Ta相对LREE亏损的特点;低分异样品不具有明显负Eu异常。张家口地区张家口组长英质火山岩的元素地球化学特征与还原型A型花岗岩相似,是华北克拉通拉斑质基性下地壳在高温、低氧逸度和低水逸度条件下的部分熔融产物,形成于碰撞后构造背景。     

中国黄土地球化学的若干河题

黄土地球化学是研究黄土中元素的分布、分配和迁移、富集的规律。它的研究不仅有助于进一步了解黄土物质成分的特征,而且对探索黄土堆积的地球化学环境,以及黄土形成过程的地球化学实质有重要意义。这些年来,我们继续以黄河中游黄土为重点,结合有关地区,进行了黄土地球化学的研究。     

塔里木沙漠公路防护林苗木保存率特征及影响因素分析

通过全部调查法对防护林工程的次年苗木保存率进行了详细调查,结果显示:(1)由于造林环境恶劣,塔里木沙漠公路防护林工程苗木保存率较低,约70%;(2)梭梭、柽柳、沙拐枣三种苗木的保存率不同,基本表现为梭梭和沙拐枣大于柽柳,而且在不同矿化度条件下也存在差异,矿化度较小时差异不大,而随着矿化度的增加差异增大;(3)三种苗木的保存率都随灌水矿化度的增加而逐渐降低,但矿化度小于10 g/L时,变化规律性不强;(4)公路沿线苗木保存率呈一定的空间分异规律,在防护林横断面不同部位、垄间不同沙丘密度、纵向复合沙垄区不同地貌部位和公路沿线不同大地貌单元之间,苗木保存率存在差异。研究结果对于极端干旱环境中造林和塔里木沙漠公路防护林可持续性研究具有借鉴意义。     

深圳湾北岸新民孔的Q_3~3-Q_4~1气候记录

对深圳湾北岸新民钻孔岩心沉积物中铁、钒元素、矿物鉴定的伊利石以及生物指标贝类介壳揭示的环境特征资料进行了分析,研究初步表明,该钻孔岩心沉积物理深12．12～10．91m层段的杂色花斑粘土中存有晚更新世晚期至早全新世气候波动的记录。钒元素和伊利石分析也得到了相应的证实。所记录的短期降温和升温事件可能表明,在第四纪末次冰期-冰消期中,气候曾强烈波动,并逐渐由晚冰期向冰后期过渡。这对研究晚武木冰期最低海面时期以来,海面回升及晚更新世晚期／早全新世的古环境方气候影响提供有价值的资料。     

138年金城-陇西63/4级地震的史料考证与发震构造背景探讨

对 138年金城 -陇西 6 3/4 级地震的历史资料考证、黄土滑坡分布及活动构造的综合研究表明 :在 138年地震中遭破坏的东汉金城郡郡治允吾县应在今青海省民和县马场垣乡下川口附近 ;陇西郡治狄道县在今甘肃省临洮县城。由此确定 138年地震的极震区位置大致在今甘肃省永靖县西北的湟水、黄河交汇地带。该区也是黄土滑坡密集分布区 ,其中的大型滑坡应为地震滑坡。在构造上该区位于拉脊山北缘弧形逆冲断裂带的前缘。拉脊山北缘断裂带为一条晚更新世活动断裂 ,部分地段为全新世活动 ,其向NE方向的逆冲推覆致使古近系泥岩和早更新世砾岩等发生了明显的挤压褶皱变形。石油勘探资料也证实拉脊山北缘弧形构造带前缘在深部存在隐伏的挤压逆冲断褶带。由此推断 138年金城 -陇西 6 3/4 级地震的发生很可能与该逆断裂 -褶皱带的新活动有关     

南黄海盆地北部坳陷古近系沉积特征及其沉积演化

南黄海盆地经历了多年油气勘探,无论是在中生界还是新生界,至今未获得油气突破。新生界储层具有优越的储集条件,故重点分析了古近系阜宁组和三朵—戴南组的沉积特征及其沉积演化特征。以钻井和测井资料为基础,将阜宁组和三朵—戴南组划分为4种沉积相类型,即河流相、扇三角洲相、三角洲相和湖相,其中河流相在研究区可划分为辫状河流相和曲流河流相;并且分析了各沉积相、沉积亚相和沉积微型的岩电性特征。仔细解剖地震反射特征,进行阜宁组和三朵—戴南组地震相分析,以单井相分析为基础,解析各地震相沉积意义。根据瓦尔特定律,将单井沉积相分析与地震相分析充分结合,分析各层段沉积相分布特征。阜宁组主要发育曲流河流相、扇三角洲相、滨浅湖相和半深湖相;三朵—戴南组主要发育辫状河流相、扇三角洲相和滨浅湖相。根据区域构造演化特征,结合沉积相分析,深入分析了研究区古近系阜宁组至三朵—戴南组的沉积演化特征。     

班公湖-怒江成矿带西段阿翁错地区早白垩世花岗闪长岩的成因及构造背景——来自斜长石和黑云母化学成分的约束

Located at the western part of the Bangong Co-Nujiang metallogenic belt, the Early Cretaceous granodiorites from the Awengcuo area are characterized by the widely developed mafic microgranular enclaves (MMEs) and obvious magma mixing. Plagioclase and biotite, as the main rock-forming minerals, record the material composition and physicochemical conditions of the magmatic system, which are ideal objects for studying the petrogenesis, magmatic evolution and tectonic setting. This paper focuses on the granodiorites (host rock) and MMEs from the aspects of geology, petrography and mineral chemistry. The MMEs are in various shapes and have sharp or transitional contact boundaries with the host rocks. The enclaves often contain back vein. The MMEs and host rocks are commonly interpenetrated with each other, and chilled borders with width of 1–2 mm on the enclaves’ side can be observed occasionally. Many phenocrysts in the enclaves are captured from the host rocks, and acicular apatite formed by quenching is found in both the MMEs and host rocks. The above characteristics suggest that the MMEs are the products of magma mixing and mingling, and material interchanges are common. The results show that the plagioclases in the host rocks have intensive oscillatory normal zoning features with narrow An value range of 48.16 to 59.05, which may represent the plagioclase crystallized before the injection of mafic magma. The An values of the plagioclase with normal zoning features vary widely, with a core An value of 29.86 and a sudden increase to 51.09 outward, showing an overall gradual increase, indicating the addition of calcium-rich magma. Plagioclases of the host rocks show normal and reverse zoning features, with relatively complex core to mantle variations of An values and wide oscillatory zonation. Formation of the wide core to mantle oscillatory zonation of the plagioclase may due to the abrupt changes triggered by magma mixing. With the continuous mixing and gradual cooling of the magma, the plagioclase continued to crystallize in the static environment, and formed a clean edge of normal zonation. Although there is a normal zoning in the inclusion matrix plagioclase, the An values vary significantly from 62.40 in the core to 28.63 in the edge. It is obviously different from the normal zoning characteristics of the host rock plagioclase, which may be the result of the mixing of mafic magma and felsic magma. The core of plagioclases in the matrix of the MMEs with the characteristics of reverse zoning and normal-reverse zoning suffered weak melting erosion, but the range of the An values is relatively small, with the characteristics of intensive oscillatory zoning. It is suggested that the core melting erosion may be caused by the rapid decrease of pressure during the ascent of the mafic magma and formed in a static magma chamber. The host rock biotite and enclave matrix biotite are primary magmatic biotite, with AlVI values of 0–0.16 apfu and 0–0.04 apfu, oxidation coefficients of 0.11–0.63 and 0.16–1.66, and magnesia contents of 0.40–0.47 and 0.42–0.46, respectively, indicating that both of the host rocks and MMEs are calc alkaline I-type granites, whose formation is related to the subduction of island arc. Combined with the regional tectonic setting, it is considered that the early Cretaceous granodiorites in the Awngcuo area were formed under the tectonic setting of the transition from northward subduction to collision of the Shiquanhe-Namucuo Tethys ocean basin. © 2023 Science Press. All rights reserved.