Fluid flow patterns and infiltration isograds in melilite marbles from the Bufa del Diente contact metamorphic aureole, north-east Mexico

In the inner aureole of the Bufa del Diente alkali syenite (north-east Mexico), thin calcareous argillite bands horizontally embedded in impure marbles acted as contact-metamorphic aquifers for hypersaline brines of magmatic origin. Thick-bedded marbles were largely impervious. From 180 m up to the intrusion contact, argillites were completely decarbonated, resulting in melilite + wollastonite + phlogopite + perovskite-bearing parageneses. In marbles, this assemblage is confined to a narrow 7-12-m-wide infiltration zone adjacent to the contact. Up to this distance, calcite + wollastonite + diopside + alkali feldspar + titanite was stable, indicating that the fluid evolution in these marbles was internally buffered. Brine infiltration from the metaargillite aquifer into the marbles occurred perpendicular to the marble-metaargillite boundaries and was confined to a zone 4-6 cm wide above the boundaries. This is documented by the three reactions Cc + Di = Mel + CO₂, (1) Cc + Kfs + Di + H₂O = Phl + Wo + CO₂, (2) Cc + Ttn = Prv + Wo + CO₂, (3) Melilites (Ak_32-45Gh_13-32Sm_32-40 to Ak_52-72Gh_0-1Sm_28-48) occur as rims around diopsides and become continuously thicker towards the metaargillite beds. Fluid inclusion observations suggest that the infiltrating brine was hypersaline (NaCl + KCl_cq～ 65 wt%) and that the reactions took place at the water-rich side of the H₂O-CO₂-salts immiscibility field at about 600d? C (2, 3) and 660 to 680d? C (1) at P～ 1200 bar and X_co2～ 0.02. Mass balance calculations show that the amount of brine infiltrated from the aquifer into the marble was very low and decreased continuously with increasing distance from the boundary. The maximum width of brine infiltration was about 6 cm. This confirms that brine flow was largely parallel to the aquifer, not perpendicular to it. The CO₂ produced by the decarbonation reactions probably escaped as an immiscible low-density H₂O-CO₂ fluid of X_co2≤ 0.5 into overlying marble via grain-edge flow. The metaargillite-marble boundary acted as a semipermeable membrane 6 cm in thickness keeping back the brine in the aquifer and losing the in-situ produced low-density CO₂-rich fluid.     

水口山Pb－Zn－Au矿田含矿流体的性质、来源及其环流历程

在矿床地质研究的基础上，从矿物包裹体的显微岩相学、均一化温度、成分、含盐度和Ｈ、０、Ｃ稳定同位素组成方面，探讨了水口山Ｐｂ─Ｚｎ─Ａｕ矿田含矿流体的性质、来源及其环流历程。含矿流体系由岩浆期后热液和地下水混合而成。对于水口山矿区而言，岩浆热液起着主导作用；对于康家湾矿区而言，岩浆期后热液和地下水热液均起着重要作用。热液成矿期从早到晚，随着温度和含盐度的逐渐降低，地下水中雨水／地层卤水的比值逐渐增大。含矿流体的环流历程经历了５个阶段。     

德兴斑岩铜矿成矿过程中地下热水运移的动力学模拟

按照质量，动量和能量守恒定律建立描述成矿流体运移过程的控制微分方程组，运用有限元方法求解，得到有关成矿流体运移的流函数和温度分布值，将上述理论应用于江西德兴斑岩铜矿区，取得了满意的效果。     

Fluid inclusions in rocks from the amphibolite-facies gneiss to charnockite progression in southern Karnataka, India: direct evidence concerning the fluids of granulite metamorphism

Abstract Fluid inclusion studies of rocks from the late Archaean amphibolite-facies to granulite-facies transition zone of southern India provide support for the hypothesis that CO₂,-rich H₂O-poor fluids were a major factor in the origin of the high-grade terrain. Charnockites, closely associated leucogranites and quartzo-feldspathic veins contain vast numbers of large CO₂-rich inclusions in planar arrays in quartz and feldspar, whereas amphibole-bearing gray gneisses of essentially the same compositions as adjacent charnockites in mixed-facies quarries contain no large fluid inclusions. Inclusions in the northernmost incipient charnockites, as at Kabbal, Karnataka, occasionally contain about 25 mol. % of immiscible H₂O lining cavity walls, whereas inclusions from the charnockite massif terrane farther south do not have visibile H₂O Microthermometry of CO₂ inclusions shows that miscible CH₄ and N₂ must be small, probably less than 10mol.%combined. Densities of CO₂ increase steadily from north to south across the transitional terrane. Entrapment pressures calculated from the CO₂ equation of state range from 5 kbar in the north to 7.5 kbar in the south at the mineralogically inferred average metamorphic temperature of 750°C, in quantitative agreement with mineralogic geobarometry. This agreement leads to the inference that the fluid inclusions were trapped at or near peak metamorphic conditions. Calculations on the stability of the charnockite assemblage biotite-orthopyroxene-K-feldspar-quartz show that an associated fluid phase must have less than 0.35 H₂O activity at the inferred P and T conditions, which agrees with the petrographic observations. High TiO₂ content of biotite stabilizes it to lower H₂O activities, and the steady increase of biotite TiO₂ southward in the area suggests progressive decrease of aH₂O with increasing grade. Oxygen fugacities calculated from orthopyroxene-magnetite-quartz are considerably higher than the graphite CO₂-O₂ buffer, which explains the absence of graphite in the charnockites. The present study quantifies the nature of the vapours in the southern India granulite metamorphism. It remains to be determined whether CO₂-flushing of the crust can, by itself, create large terranes of largeion lithophile-depleted granulites, or whether removal of H₂O-bearing anatectic melts is essential.     

塔里木盆地北部油气运移二维二相数值模拟分析

油气运移和聚集过程实际上是油（气）水饱和度知疏导层的变化过程，盆地中油（气）二相流动问题的研究就是对这一过程的定量描述，本项研究是在前人工作基础上，考察压实作用造成骨架变形来推导新的二维二相流动方程，它容描述异常压力演化与二相流动于一式，在模拟方法上采用有限分析的数值方法，这应用于新疆塔里木盆地北部地区，展示了该区异常压力、含水饱和度弥散状扩散效应以及流速场在地质历史时期动态模拟演化特征；指出了该     

新疆索尔库都克类夕卡岩铜（钼）矿床地质特征及矿床成因

索尔库都克矿床是近年来新疆境内探明的中型铜（钼）矿床。对其成矿地质环境、矿床地质特征、夕卡岩其分带的研究表明，该矿床之夕卡岩与Д．Ｃ．柯尔仁斯基所划分的类夕卡岩相类似。该夕卡岩是由凝灰砂岩、安山玢岩等变质形成的。流体包裹体和稳定同位素的研究表明，该矿床是我国特殊的层状夕卡岩矿床，与接触交代夕卡岩矿床明显不同。     

大兴安岭中南段金属矿床流体包裹体研究

作者通过在不同温度下对包裹体特征、相变行为的系统观察与测定，以及对包裹体气、液相成分的分析、获取了研究区内主要矿床成矿过程中成矿液体的温度、盐度、密度、流体成分、流体的沸腾现象、成矿压力以及ＰＨ，Ｅｈ，Ｆｏ２，还原参数等成矿的物理化学参数，从而为划分矿化蚀变阶段，矿床类型、成矿系列和深化对矿床成矿作用与成矿机制的认识提供了科学依据。尽管矿床属于不同的成矿系列，只要矿床类型相同，矿床的流体包裹体地球     

金刚石的不纯净组分与地幔流体的研究

金刚石生长阶段所捕虏的不纯净组分，能够提供大量地幔流体的信息。本文从金刚石的成因研究，表征地幔流体的固体包裹体、流体包裹体及流体的制药因素等方面讨论了金刚石不纯净组分与地幔流体的关系。