西秦岭礼县新生代钾霞橄黄长岩系中的含钛透辉石

对西秦岭礼县新生代钾霞橄黄长岩系中的基质相含钛透辉石进行了矿物化学研究，根据透辉石中Ti和Al的含量划分出低Ti—透辉石和高Ti—铝透辉石两种基本类型，它们作为同源岩浆演化结晶的产物，结晶顺序前者先于后者。火山岩系的透辉石[Ca(Mg，Fe)Si2O6]结晶过程中广泛存在着CaTiAl2O6(钛辉石)分子替代，晚期熔体富Ti、Al贫Si、Mg。百草山岩筒是演化岩浆结晶的产物，熔体向富Ti、Al、Fe^3 、Na，贫Mg、Si趋势演化；在透辉石成分上表现为CaTiAl2O6和NaFe^3 Si2O6(锥辉石)端元分子对Ca(Mg，Fe)Si2O6的替代。本地区基质相透辉石与世界上典型地区的钾霞橄黄长岩系的透辉石具有不同程度的可比性，反映了这种特殊的岩浆熔体成分在一定程度上控制着透辉石的结晶过程和阳离子在矿物晶格中的占位。     

新疆伊吾县宝山铁矿床矽卡岩成因研究

宝山铁矿床位于东准噶尔库兰卡孜干-北塔山-纸房-琼河坝岛弧带东段。宝山铁矿中矽卡岩与铁矿体密切共生,是重要的找矿标志。研究区矽卡岩中石榴子石、透辉石单矿物电子探针分析结果显示,石榴子石属于钙铁榴石-钙铝榴石系列,透辉石属于透辉石-钙铁辉石系列。矽卡岩中高场强元素(如Nb、Ta、Zr、Hf)相对亏损,稀土元素表现出LREE富集,HREE亏损的特点。∑REE为39.90×10~(-6)~178.43×10~(-6),∑LREE/∑HREE比值1.64~7.53,(La/Yb)N比值为1.32~10.10,轻、重稀土元素分异程度较弱,与玄武质凝灰岩具有相似的地球化学特征,这说明矽卡岩是玄武质凝灰岩受后期岩浆热液改造形成,随着温度和压力降低,磁铁矿沉淀形成铁矿体。     

磁法勘探在新疆尉犁县且干布拉克蛭石、磷灰石矿床普查评价中的应用效果

尉犁县且干布拉克蛭石矿为特大型,磷灰石矿为大型.蛭石、磷灰石均赋存于磁性较强的透辉石岩及超基性岩中,矿体与围岩间有较明显的磁性差异,含矿母岩70%被第四系覆盖.利用地面磁测,较好地圈定了含矿母岩的边界,提供了含矿体的平面形态及产状,为勘查缩小了靶区.磁法勘探不仅是直接找磁铁矿床及某些有关金属矿床的有效方法,而且在间接寻找非金属矿床上亦能发挥作用.     

硅灰石、透辉石在陶瓷中的基本反应和作用

本文以硅灰石和高岭石、透辉石和高岭石为端元组分,推导了二元假相图。根据这两个假相图,提出了四个基本固相反应。用这些基本反应以及硅灰石、透辉石的矿物学性质,说明了它们对陶瓷坯体工艺性能的作用。     

滇西鹤庆地区六合透辉石正长斑岩锆石SHRIMP U-Pb年龄及其意义

鹤庆县六合透辉石正长斑岩中的锆石有2种成因类型:一是岩浆锆石,二是具有老核新壳的岩浆复合锆石。用锆石SHRIMP U-Pb定年法,测定了岩浆锆石和岩浆复合锆石的新壳2部分,其年龄为37.8Ma±1.1Ma,属于喜马拉雅早期,相当于早渐新世。结合前人的资料,对斑岩的属性、源区及岩浆复合锆石的老核等问题进行了探讨。     

Influence of igneous processes and serpentinization on geochemistry of the Logatchev Massif harzburgites (14°45′N,Mid-Atlantic Ridge), and comparison with global abyssal peridotites

We acquired bulk-rock analyses of Mid-Atlantic Ridge (MAR) harzburgites in order to understand the influence of submarine igneous and metamorphic processes on the distribution of incompatible elements (especially rare Earth elements or REEs) in abyssal peridotites. The geochemical characteristics of these Logatchev Massif serpentinized and talc-altered harzburgites, and spatially associated metagabbros were then compared with a compilation of global abyssal peridotites. The Logatchev harzburgites show light rare earth element (LREE) enrichments (average La _N /Yb _N = 2.81), positive correlations between LREEs (e.g. La, Ce, Pr, and Nd) and high field strength elements (HFSEs; e.g. Nb and Zr), and positive correlations between HFSEs and Th. Most global abyssal peridotites show similar trends. We suggest that the systematic enrichment of incompatible elements probably reflects a post-partial fusion magmatic refertilization. The compositional scatter exhibited by some serpentinized peridotites in Nb-LREE diagrams is probably due to the elimination of diopside during partial melting and significant impregnation by a melt produced in the Opx–Ol–Sp melting field rather than to later hydrothermal alteration. The correlation between Pb and Nd observed for most global abyssal peridotites, including the Logatchev harzburgites, indicates magmatic generation. The scatter of Pb in some rocks suggests that lead is likely mobile during serpentinization or weathering. Low to moderate water/rock (W/R) ratios in the harzburgites calculated from Sr isotopic compositions (5.98–26.20 for a close system and 1.66–2.72 for an open system), and the low abundance of REEs in Logatchev hydrothermal fluids indicate that the REE contents of abyssal peridotites probably were little influenced by hydrothermal alteration. Compared to this later alteration, the presence of small proportions of gabbroic melt (from 1:30 to 1:3 in our sample) that crystallized in the residual harzburgites modified their REE patterns significantly by elevating the LREEs.     

新疆磁海铁（钴）矿床次火山热液成矿学

磁海铁（钴）矿床颇具特色,以“石榴石－透辉石－磁铁矿”为基本矿石建造;成矿作用发生在早二叠世北山裂陷作用和火成活动晚期,以基性次火山岩浆期后富铁流体的（交代）充填为成矿方式,矿体产于辉绿岩体原生裂隙系统;成矿流体的化学演化具有典型（火山）岩浆期后热深演化特点,形成了一系列热液蚀变其中石榴石透辉石岩有别于传统理解的“夕卡岩”;成矿物质源于碱性玄武岩浆,基性次火山岩浆多次脉动式入侵是矿床形成的必要条件     

透辉石用作橡胶、油漆填料的研究

塑料、橡胶、油漆等聚合物复合材料以天然或人工合成树脂（石油化工产品）为基料,数量有限,而对于聚合物复合材料需求的增长和能源危机,则造成了塑料、橡胶、油漆原料短缺、价格上涨。在聚合物中添加填料（填充剂）的目的一方面可提高制品性能,另一方面又可使原料增量、成本降低。许多无机填料因具有特殊的物理化学性质,能改善聚合物的力学性能（如硬度、刚度、抗压强度、抗拉强度、抗冲击强度等）、加工性能和热性能等,在聚合物复合材料中有广泛应用。其中天然矿物作为橡塑、油漆填料的最大优点是成本低,因此在性能得以保证的前提下…     

Preliminary phase equilibria of the nepheline-diopside system under variable pressures (up to 28 kb) and temperatures

The nepheline-diopside join defines the ultra-alkaline portion of the basalt tetrahedron and the bulk composition of nephelinitic rocks lie in this join. Schairer and others established that under atmospheric pressure, the join cuts through the primary phase volumes of olivine_ss, carnegieite_ss and nepheline_ss. Melilite coexists with nepheline_ss, olivine_ss and diopside_ss below 1160±10°C and olivine reacts out at low temperature. Experimental studies on seven compositions show the presence of a pseudoeutectic at Ne₇₀Di₃₀ and 1420°C, where diopside_ss, nepheline_ss and liquid are in equilibrium. Olivine and melilite do not appear in the system and the assemblage below 1225±20°C is diopside_ss+nepheline_ss.     

Phlogopite and quartz lamellae in diamond‐bearing diopside from marbles of the Kokchetav massif,Kazakhstan: exsolution or replacement reaction?

Exsolution lamellae of pyroxene in garnet (grt), coesite in titanite and omphacite from UHPM terranes are widely accepted as products of decompression. However, interpretation of oriented lamellae of phyllosilicates, framework silicates and oxides as a product of decompression of pyroxene is very often under debate. Results are presented here of FIB‐TEM, FEG‐EMP and synchrotron‐assisted infrared (IR) spectroscopy studies of phlogopite (Phlog) and phlogopite + quartz (Qtz) lamellae in diamond‐bearing clinopyroxene (Cpx) from ultra‐high pressure (UHP) marble. These techniques allowed collection of three‐dimensional information from the grain boundaries of both the single (phlogopite), two‐phase lamellae (phlogopite + quartz), and fluid inclusions inside of diamond included in K‐rich Cpx and understanding their relationships and mechanisms of formation. The Cpx grains contain in their cores lamellae‐I, which are represented by topotactically oriented extremely thin lamellae of phlogopite (that generally are two units cell wide but locally can be seen to be somewhat broader) and microdiamond. The core composition is: (Ca_0.94K_0.04Na_0.02) (Al_0.06Fe_0.08Mg_0.88) (Si_1.98Al_0.02)O_6.00. Fluid inclusions rich in K and Si are recognized in the core of the Cpx, having no visible connections to the lamellae‐I. Lamellar‐II inclusions consist of micron‐size single laths of phlogopite and lens‐like quartz or slightly elongated phlogopite + quartz intergrowths; all are situated in the rim zone of the Cpx. The composition of the rim is (Ca_0.95Fe_0.03Na_0.02) (Al_0.05Fe_0.05Mg_0.90)Si₂O₆, and the rim contains more Ca, Mg then the core, with no K there. Such chemical tests support our microstructural observations and conclusion that the phlogopite lamellae‐I are exsolved from the K‐rich Cpx‐precursor during decompression. It is assumed that Cpx‐precursor was also enriched in H₂O, because diamond included in the core of this Cpx contains fluid inclusions. The synchrotron IR spectra of such diamond record the presence of OH^? stretching and H₂O bending motion regions. Lamellar‐II inclusions are interpreted as forming partly because of modification of the lamellae‐I in the presence of fluid enriched in K, Fe and Si during deformation of the host diopside; the latter is probably related to the shallower stage of exhumation of the UHP marble. This study emphasizes that in each case to understand the mechanism of lamellar inclusion formation more detailed studies are needed combining both compositional, structural and three‐dimensional textural features of lamellar inclusions and their host.