中央投20亿元启动地质勘查基金——着重用于重点矿种、重点成矿区带的前期勘查

为了加大国家财政对矿产资源勘查投入力度，鼓励和引导社会资金投入，建立矿产资源勘查投入良性循环机制，财政部、国土资源部近日发布《中央地质勘查基金（周转金）管理暂行办法》。这是贯彻落实《国务院关于加强地质工作的决定》的第一个配套文件。     

苏格兰西南部达拉德变质带中的大气降水渗入和氧前锋：区域金活动性的新假？

产于达拉德变质带黑云带中变质期后石英脉由三种主要类型组成：含黄铁矿的他形成英型，含赤铁矿的他形石英型和含赤铁矿或金红石的柱状石英型。他形石英脉中的氧化矿物由先存硫化物氧化而成，金在此氧化过程中被活化。成分相似的晚期柱状结构石英晶体经历了相分离的流体形成。脉中石英的氧同位素比值不等。成矿流体含有大量大气降水的成分，其同们素组成和化学成分随着水－岩相互作用而逐渐变化。金的活化转移与再沉积在片岩地层中随     

长乐-南澳剪切带晋江段构造岩特征及其构造变形机制

长乐-南澳左行韧性剪切带位于东南沿海，是酉太平洋大陆边缘构造带的一个组成部分。本文基于野外观察及室内分析，并借助透射电镜对变形石英的内部结构进行了观察，利用变形石英显微构造参数估算剪切带中的应力差值，由此探讨了形成构造岩的机制。     

广西环江县北山铅锌黄铁矿矿床发现史

广西环江北山铅锌矿床是由古人发现的，始于何时尚难断定。其采矿历史较悠久，据文献记载与考证，采铅锌矿炼银始于宋王朝，距今约８００年左右；炼锌始于明王朝，距今约３８０余年，１９７１年广西冶金地质勘探公司二一五队曾在北山一带普查评价褐铁矿，首先提出了该区褐铁矿＂属小型热液多金属铅锌硫化物矿床铁帽＂的概念。经广西地质局第九地质队（现广西第七地质队）１０年（１９７５－１９８６）的勘查，证实为一个以锌为主的大型多金属黄铁矿矿床，探明储量，其中锌、锗、黄铁矿为大型矿床规模，银、镉为中型矿床规模，铅、铁为小型矿床。为此该队荣获地矿部１９８９年度找矿成果二等笑。现今由中国有色金属工业总公司与广西壮族自治区人民政府合资兴建的北山铅锌硫铁矿已初具规模，一座新兴的矿山城镇已耸立在桂北群山之中，它将成为广西有色金属工业重要原料基地之一。     

Mantle processes during ocean formation：Petrologic records in peridotites from the Alpine－Apennine ophiolites

Mantle peridotites were early exposed at the sea-floor of the Jurassic Tethys derived from the subcontinental mantle of the Europe-Adria system. During continental rifting and oceanic spreading, these lithospheric peri-dotites were percolated via diffuse reactive porous flowby melt fractions produced by near-fractional melting of the upwelling asthenosphere. Ascending melts inter-acted with the lower lithosphere, dissolving pyroxenes and precipitating olivine, and crystallized at shallower levels in the mantle column causing melt impregnation.Subsequent focused porous flow formed replacive dunitechannels, cutting the impregnated oeridotites, which were conduits for upward migration of MORB-type liq-uids. Melt migration produced depletionlrefertilization and significant heating of the percolatedlimpregnated mantle, i.e the thermochemical erosion of the litho-sphere. Impregnated and thermally modified lithos-pheric mantle was cooled by conductive heat loss dur-ing progressive lithosphere thinning and was intrudeaby MORB magmas, which formed Mg-rich and Fe-richgabbroic dykes and bodies. Alpine-Apennine ophiolitic peridotites record the deep-seated migration of melts which changed their compositions and dynamics during the rift evolution. The thermochemical erosion of the lithospheric mantle by the ascending asthenospheric melts, which induces significant compositional and rhe-ological changes in the lower lithosphere, is a major process in the evolution of the continent-ocean transi-tion towards a slow spreading oceanic system.