广西拉么铜锌矿床矿物学特征及其地质意义

广西拉么铜锌矿床矿物学特征及其地质意义李明琴税哲夫聂爱国张杰（贵州工业大学资源工程系，贵阳５５０００３）关键词黄铜矿闪锌矿矿物学特征铜锌矿床广西拉么广西拉么铜锌矿床位于黔桂边界广西南丹县境内，在大地构造上位于江南地轴西南缘、南丹河池轴缘凹陷带中。矿床...     

Geochemical Characteristics and Metallogenesis of Volcanic Rocks as Exemplified by Volcanic Rocks in Ertix,Xinjiang

Volcanic rocks in Ertix,Xinjiang,occurring in the collision zone between the Siberia Plate and the Junggar Plate,are distributed along the Eritix River Valley in northern Xinjiang.The volcanic rocks were dated at Late Paleozoic and can be divided into the spilite-keratophyre series and the basalt-andesite series.The spilite-keratophyre series volcanic rocks occur in the Altay orogenic belt at the southwest margin of the Siberia Plate.In addition to sodic volcanic rocks.There are also associated potassic-sodic volcanic rocks and potassic volcanic rocks.The potassic-sodic volcanic rocks occur at the bottom of the eruption cycle and control the distribution of Pb and Zn deposits.The potassic volcanic rocks occur at the top of the eruption cycle and are associated with Au and Cu mineralizations.The sodic volcanic rocks occur in the middle stage of eruption cycle and control the occurrence of Cu(Zn) deposits.The basalt-andesite series volcanic rocks distributed in the North Junggar orogenic belt at the north margin of the Junggar-Kazakstan Plate belong to the potassic sodic volcain rocks.The volcanic rocks distributed along the Ulungur fault are relatively rich in sodium and poor in potassium and are predominated by Cu mineralization and associated with Au mineralization.Those volcanic rocks distributed along the Ertix fault are relatively rich in K and poor in Na,with Au mineralization being dominant.     

铜陵老鸦岭Au、Ag的宏观和微观分布型式

该矿区铜矿化和锌铅矿化主要发生在二叠系和三叠系的灰岩、白云岩化灰岩、硅质和炭质页岩中，部分岩石具有较高的Ａｕ、Ａｇ等元素的背景值。石英问长玢岩规模较大者，与铜矿化和其他矿化关系密切。主要矿石类型有夕卡岩型、硅质页岩型和角岩型３种。金主要以吸附形式存在胶状硫化矿物和草莓状黄铁矿中，在角岩中，金品位较高且见有较大颗粒的自然金。通过对３个中段的系统采样分析和计算机处理，得出该矿区金、银等有关元素的宏观分布模式。     

云南金矿带划分及成矿规律

云南岩金矿床可划分9条成矿带（区）,金矿储量占全省岩金上表总储量96．42％,有充分代表性。金沙江-哀牢山富碱斑岩金矿带,包括北衙（大型）、金厂箐（中型）、小水井（大型）、长安（大型）等金矿,上表储量66．06t,远景储量240t。首次将小水井、长安金矿列为富碱斑岩型金矿床。广南-富宁矿集区,包括老寨湾（大型）、那能（中型）、堂上（中型）等金矿,上表储量35．889t,工程控制储量达82．549t。P3β^1、P3β^2、P3l等层位赋存玄武岩型金矿;D1、T1、T2层位赋存卡林型金矿,成因与岩浆活动有关,为燕山期中-低（主）温热液矿床,属扬子地块西南缘低温成矿区重要组成部分。     

保山打厂凹多金属矿成矿规律及靶区优选

矿区严格受背斜倾没端构造破碎带控制。多金属矿床垂向分带明显从上至下金、铅、锌、铜铁规律分布,且经物化验证。     

云南永仁直苴斑岩型铜矿控矿条件及远景

NW向、近NS向断裂控制矿体展布,NW走向陡倾角断裂对成矿元素富集起主要作用,两组断裂交叉部位以及岩体内外接触带凹部是有利赋矿空间。铜、钼矿床具有多期、多阶段、多物质来源、多成矿作用的特点。     

Geochemical Characteristics and Zonation of Primary Halos of Pulang Porphyry Copper Deposit,Northwestern Yunnan Province,Southwestern China

The Pulang (普朗) porphyry copper deposit, located in the southern segment of the Yidun-Zhongdian (义敦-为中甸) island arc ore-forming belt of the Tethys-Himalaya ore-forming domain, is a recently discovered large copper deposit. Compared with the composition of granodiorite in China, the porphyry rocks in this area are enriched in W, Mo, Cu, Au, As, Sb, F, V, and Na2O (K1≥1.2). Compared with the composition of fresh porphyry rocks in this district, the mineralized rocks are enriched in Cn, Au, Ag, Mo, Pb, Zn, W, As, Sb, and K2O (K≥1.2). Some elements show clear anomalies, such as Zn, Ag, Cu, Au, W, and Mo, and can be regarded as pathfinders for prospecting new ore bodies in depth. It has been inferred from factor analysis that the Pulang porphyry copper deposit may have undergone the multiple stages of alteration and mineralization: (a) Cu-Au mineralization; (b) W-Mo mineralization; and (c) silicification and potassic metasomatism in the whole ore-forming process. A detailed zonation sequence of indicator elements is obtained using the variability index of indicator elements as follows: Zn→Ag→Cu→Au→W→Mo. According to this zonation, an index such as (Ag×Zn) D/(Mo×W) D can be constructed and regarded as a significant criterion for predicting the Cu potential at a particular depth.     

云南永平上别咧铜多金属矿成因

上别列铜多金属矿床属水泄咱咧铜钴矿区外围新发现的矿点,赋存于兰坪-思茅盆地中生带红色碎屑岩建造厂街-水泄成矿带中,区内有30余处矿点,中-小型铜、铁矿点二处。认为属改造型中低温热卤水裂隙充填矿床,水泄咱咧铜钴矿区外围具备进一步找矿的条件。     

印度尼西亚红土型镍矿

红土型镍矿分布在环太平洋亚热带-热带多雨地区。镍矿体产于趟基性岩上部的红土风化壳中,受地形控制明显,成因类型为红土型硅酸镍氧化矿,以褐铁矿型和腐岩型为主,矿石质量和可利用性均较好。     

Bayan Obo Controversy: Carbonatites versus Iron Oxide‐Cu‐Au‐(REE‐U)

The Bayan Obo Fe‐REE‐Nb deposit is the world’s largest rare earth element (REE) resource and its genesis has been the subject of much debate for many years. The most popular are the carbonatite‐related and hydrothermal Fe oxide‐Cu‐Au‐(REE‐U) genetic models. Comparisons of geologic setting, lithology, mineral assemblages, metal associations, geochemistry (particularly REE and light REE/heavy REE ratios), fluid chemistry and isotopics indicate that the Bayan Obo deposit shares features of both types, which are classified differently; that is, the carbonatites model is host‐rock based, while the Fe oxide‐Cu‐Au‐(REE‐U) model is essentially mineral assemblage and metal association based. A speculative classification scheme is tentatively put forward to link the two models, but many questions remain for further studies.