塔里木盆地卫星重力异常与油气资源的相关性研究

利用中国地区３６０阶局部重力场模型ＩＧＧ９３Ｅ，计算出不同阶窗的卫星重力异常，然后利用Ｍｏｌｏｄｅｎｓｋｙ单层密度积分方程将卫星重力转化为分层面密度异常，结合其他地球物理资料，分析并探讨了塔里木盆地油气资源与卫星重力异常的相关性。研究表明：塔里木盆地油气资源分布与１０１－１８０阶卫星分同密度异常图中负密度异常带关系密切。而１８１－３６０阶卫重分层面异常图则对盆地内生油、储油的坳陷、隆起等构造有较９     

从层序地层学研究试论华北地区寒武系与奥陶系分界

华北地区寒武系－奥陶系过渡沉积可划分为三个层序：凤山层序、两河口－红花园层序和大湾层序，凤山层序与两河口－红花园层序之间的界面为Ⅱ型层序界面（ＳＢ２），而两河口－红花园层序与大湾层序之间的界面为Ｉ型层序界面（ＳＢ１）。华北地区寒武系－奥陶系界线应置于两河口－红花园层序的海侵体系域的下界面，在徐州地区为三山子组（狭义）与韩家组之间，在北京西山为韭园组微晶丘与冶里组之间。     

关于银山矿床成矿作用的几个问题——兼与《江西银山铜铅锌金银矿床》的作者商榷

银山多金属矿床是一个特大型火山—潜火山热液矿床,具有复杂的多期多阶段的成矿作用和有序的成矿分带。成矿作用主要为火山—潜火山热液作用,但在此之前,还经历了一期由韧脆性剪切带形成而引起的动力变质热液作用。根据矿体与3个旋回潜火山岩体的时空关系,火山—潜火山热液成矿作用又可分为两个成矿期和5个成矿阶段。矿床地质地球化学研究表明成矿作用在空间上具有定向迁移的特点,结合流体动力学计算机数值模拟认为定向迁移的根本原因是构造岩浆脉动和隐伏岩体形态产状。笔者认为,矿区深部可能有隐伏岩体,但对隐伏的斑岩铜矿床不应抱很大希望     

The Discovery of Phlogopite Exsolution Lamellae in Garnets of Eclogite Inclusions, Liaoning Province

In No. 50 kimberlite pipe of Fuxian County, Liaoning Province, an eclogite inclusion(nodule), which is extremely rare in kimberlites, was discovered and phlogopite exsolutionlamellae were found in garnets of the inclusion. Microscopic, TEM and energy spectral observa-tions and studies confirmed that these lamellae are phlogopite. They are colourless and acicularin section, generally 0.5-5μm in width and 10-100μm in length. Nevertheless, fine lamellae,0.05-0.1μm wide and 1-2μm long, are also well developed. Along [111] of the garnet, three setsof phlogopite lamellae show oriented arrangement approximately at angles of 60°-70°, indi-cating that these lamellae might be the product of exsolution from garnet as a result ofpressure-release when eclogite ascended from the relatively deep level to the relatively shallowlevel of the mantle. Tiny acicular exsolution minerals (or inclusions) are commonly found ingarnet and pyroxene in eclogite inclusions of kimberlites all over the world and it has been re-ported that the identified exsolution minerals include pyroxene and rutile. This is the first timethat phlogopite exsolution lamillae were found in eclogite inclusions in the world.     

Sequence Stratigraphy of the Permian--Triassia Boundary Section of Changxing, Zhejiang, Southern China

Three third-order sequences and about one hundred high-frequency cycles or Milankovitchcycles within the Late Permian Changxingian to Early Triassic Griesbachian are identified in theMeishan Section of Changxing, Zhejiang Province, southern China, the candidate stratotype sec-tion of the global Permo-Triassic boundary, based on a detailed study of the biological,ecological and high-resolution allochthonous cyclic events, microfacies and depositional systems.Furthermore, the stacking pattern of the depositional systems across various Changxingian andGriesbachian sedimentary facies of the Lower Yangtze and the sequence stratigraphic frameworkare outlined with the Meishan section as the principal section. In this paper the habitat types offossil biota are applied to semiquantitative palaeobathymetry and the study of relative sea levelchanges.     

Mineralization Ages of the Jiapigou Gold Deposits,Jilin

The Jiapigou gold deposits are typical vein type deposits associated withArchaean greenstone belts in China. According to the crosscutting relationships between dykesand auriferous veins, single hydrothermal zircon U-Pb dating and quartz K-Ar,~(40)Ar-~(39)Ar andRb-Sr datings, the main mineralization stage of the Jiapigou deposit has been determined to be2469-2475 Ma, while mineralization superimposition on the gold deposit occurred in1800-2000 Ma and 130-272 Ma. They form a mineralization framework of one oldermetallogenic epoch (Late Archaean-Early Proterozoic) and one younger metallogenic epoch(Mesozoic) of gold deposits in Archaean greenstone belts in China.     

Thermodynamic Modelling of Ore-Forming Mechanism of the Changkeng Gold-Silver Deposits in Guangdong Province

The Changkeng gold-silver deposits consist of a sediment-hosted, disseminated gold deposit and a replacement-type silver deposit. The mineralizations of gold and silver are zoned and closely related to the silicification of carbonate and clastic rocks, so that siliceous ores dominate in the deposit. The mineralizing temperature ranges mainly from 300 to 170℃, and K+, Na+, Ca2+, Mg2+, and Cl- are the major ions in the ore-forming fluid. Calculations of distribution of metal complexes show that gold is mainly transported by hydrosulphide complexes, but chloride complexes of silver, iron, lead, and zinc, which are transformed into hydroxyl and hydrosulphide complexes under neutral to weak-alkaline circumstances in the late stage, predominate in the ore-forming solutions. Water-rock interaction is confirmed to be the effective mechanism for the formation of silver ores by computer modelling of reaction of hydrothermal solution with carbonate rocks. The solubility analyses demonstrate that the precipitation     

福建省东部及邻区岩浆活动的构造环境与热变质作用

研究区自加里东期运动以来，经历了复杂的构造－岩浆－热演化过程。在分析岩浆活动特征及其形成的构造环境的基础上，探讨了研究区沉积岩系及其中有机质的热变质作用。     

三组结构面状态下不同产状结构面的力学效应研究

本文分析了三组结构面产状模型力学实验结果, 揭示了这种组合条件岩体中产生压剪区、张剪区及结构面、结构体的多种变形成分, 也揭示了压剪区和张剪区形成机理、及三组结构面组合下结构面产状的力学效应。     

太白维山中生代火山岩特征及其与成矿的关系

晋北太白维山火山岩属钾质碱性玄武岩系列,产于板块内部活化带,来源于上地幔或下部地壳,被上部地壳物质混染,为壳幔源型或同熔型火山岩.火山岩与Ag(Pb、Zn)矿化关系密切,是成矿热液和矿质的主要来源之一.