云南个旧地区位于华南板块西南部,扬子地台与华南加里东地槽过渡带的海西印支期右江陆缘裂谷盆地西南部的一个断陷盆地内.云南个旧他白地区拉丁尼克晚期—诺利克期变质玄武岩地质、地球化学特征表明,该岩石受比较强烈的区域构造影响,岩石变质作用较强.岩石以低Si,富集不相容元素(Ti、P、K等),贫MgO、CaO为特征,主要为高钛碱性玄武岩.微量元素表现为异常低的Rb、Ba含量,Sr严重亏损,以及Ta、Ti、Zr、Hf、Th含量较高的特点,与峨眉山高钛玄武岩微弱的地壳混染特点相似.稀土元素表现为轻稀土元素富集的右倾型,具弱的正Eu异常.Sr-Nd同位素特征表明,个旧他白地区变质玄武岩主要来自原始地幔,并落于洋岛玄武岩区域,与峨眉山高钛玄武岩同源.因此,推测三叠纪扬子地块的伸展作用以及思茅地块对扬子地块的俯冲作用,诱导峨眉山地幔柱头部重新进行了 一次低程度的部分熔融,由于地幔柱活动的影响持续时间较长,部分地区地幔柱活动能量较低,玄武质岩浆未喷出地表,形成岩浆房.个旧他白地区变质玄武岩是在地幔柱岩浆活动中心部位相对较弱的阶段,特别是在地幔柱活动中心的边缘地带、岩石圈较厚、熔融程度相对较低的条件下形成的,晚三叠纪岩浆房再次喷发形成玄武岩.

云南个旧超大型锡多金属矿田研究成果很多,但是西区找矿一直没有取得突破.本文以建造-构造-成矿综合研究为基本思路,综合前人的大量资料,重点为西区建立了新的构造岩相找矿模型.以中三叠统个旧组为沉积建造基础,晚白垩世发育花岗杂岩体建造.中生代晚期经历了大规模的岩浆热液成矿过程,成矿时代覆盖了70～90 Ma,集中在80 Ma左右,形成最主要的成矿岩相.通过矿田构造岩相成矿图的编制,发现成矿阶段处于挤压-伸展构造转换体制,认为原始的个旧断裂两盘成矿是一致的,西区与东区的成矿模型是相同的.构造岩相的界面成为构造-岩浆-热液流体充填和交代蚀变两种主要矿床类型的有利空间.矿田构造-地层-岩浆即构造岩相成矿模型显示,由于个旧断裂垂直和水平方向多期次、规模性活动的改造,西区表现为高隆起、复杂错动的构造特点,因而成矿构造岩相具有残留性、复杂性、低位性等特征.依据上述研究成果,结合地物化信息,指出了西区找矿方向和有利区段.

Due to much covering by sand and grass,there is less mineralization information on the ground in Daolangheduge tungsten-polymetallic mine.Geological and geochemical studies show that the Early Cretaceous K-feldspar granite closely correlates to tungsten mineralization,while the ore-hosting rock is chiefly the Permian augite diorite.According to the difference of physical property between host rock and ore body,the geological mapping,magnetic and gravity survey at scale of 1∶10 000 have been completed in the deposit.By integrated gravity-magnetic inversions of data,three NE-trending important structural alteration zones are identified in augite diorite occurring in the northwestern part of the deposit,which correspond to negative magnetic anomalies,respectively.Parallel to the boundary between augite diorite and K-feldspar granite,the three zones have the length of 800-3 000 m and the width of 50-100 m.As a result,six integrated geophysical anomalies are predicted in augite diorite.The depth of anomalies does not exceed 1 000 m and the area of a single anomaly is usually 500 800 m2.Through drilling,three blinded fractured-zone type tungsten-polymetallic exploration targets are discovered.Tungsten-polymetallic ore bodies are sited in the depth of 150-650 m.The thickness of the ore body is 2-4 m.The combination method of regional metallogenic condition analysis and integrated gravity-magnetic inversions is confirmed to be effective for forecasting tungsten deposit in covered area and worth to being applied in other region.

Jinzhuchong copper deposit in Jinping county of Yunnan province is on the suture zone between the Qinghai—Xizang(Tibet)—Yunnan plate and Yangtze plate, which belongs to the southeast section of the Ailao Mountains metamorphic terrane. The area is among the crust accretionary belts of the Ailao Mountains metamorphic terrane which is chiefly composed of high-grade metamorphic rocks. The deposit is located in a vegetable-covered high mountain area with big topographic relief, where exploration is a difficult problem. This paper takes this deposit as an example and comprehensively applies high-precision magnetic survey,dual-frequency IP and EH4 to do prospecting work. The geophysical was worked out according to soil geochemical exploration and geological information. In this way the paper has predicted favorable mineralization targets and then done effective engineering test. The result shows that the deposit has vast metallogenic potential, and the fast prospecting model in vegetable-covered high mountains was initially established in southern section of the Ailao Mountains.

Lateritic nickel deposits are the major targets of the mineral exploration.The Ni is one of the scarcest metals in our country and there are abundant lateritic nickel deposits in Indonesia.But in abroad,there are lot of challenges from the mining policies,technological conditions and climate.The efficient,fast and low-cost exploration is the fundamental approach to do with the questions.This article takes the lateritic nickel deposit as an example in Sulawesi Island,Indonesia.Firstly,the high-accuracy ground magnetic survey had been conducted to delineate the targets by analyzing the characters of the magnetism in the survey area.Secondly,handheld X-ray fluorescence analyzer was successfully applied in delineating the ore body of Nickel on the spot by univariate regression analysis with the data by the lab analyzer and by the handheld X-ray fluorescence analyzer.At last,the efficient,fast and low-cost exploration model of Lateritic Nickel Deposits was set up.

The Shapolin Mo deposit in Luoning, western Henan Province, is tectonically located at the eastern part of East Qinling molybdenum ore belt in the southern margin of the North China craton. It is a veinlet-disseminated type molybdenite deposit newly discovered in the hypometamorphic rocks of Archean Taihua Group. The research of geological features was carried out in this area. The Re-Os isotopic dating of one quartz vein sample yielded a model age of 126.8±1.7 Ma. This indicates that the Shapoling molybdenum deposit formed mainly in the Yanshanian, the same as Jinduicheng and Leimengou Mo deposits. The content of Re isotope also shows its material mainly derived from upper mantle. Considering the complication of formation mechanism of the Shapoling molybdenum deposit, further research, especially deep drilling, is needed. It is of great significance to verify the existence of deep-concealed porphyry bodies and porphyry-type Mo ore field with large reserves and the potential of prospecting.

In the blind area of exploration overlying grassland, how to select the effective, reasonable, economic technique methods combination to search for concealed ore deposit is the important issue in global mineral exploration field. This paper has adopted geological mapping, high-accuracy ground magnetic surveying, radioactivity surveying, RT, VLF( very low frequency), x-ray fluorescence measuring, drilling etc. to do preliminary exploration , taking Daolangheduge ore area as an example in Inner Mongolia XiangHuang banner. The result implied there is a broad prospect of Cu-W deposit. The article has introduced the applied exploring methods and its combination in detail.

Cenozoic basalts in the Linqu-Changle area, Shandong Province, are characterized by abundant mantle-derived xenoliths. Recently, we discovered that some xenoliths in the Beiyan paleovolcanic crater contain some fine phlogopite veins related to mantle K-metasomatism. Since the closure temperature of phlogopite is much lower than the eruptive temperature of basaltic magma and the phlogopite has potential to record the time when hot magma cool down through the closure temperature of phlogopite, here we try to use the Ar-40/Ar-39 age of phlogopites to determine the ending time of eruption of basaltic magmas and age of basalt in the Beiyan paleovolcanic crater. Three phlogopite samples from three mantle-derived xenoliths from different positions in the Beiyan paleovocanic crater yielded identical Ar-40/Ar-39 plateau ages of 18.42 +/- 0. 21Ma, 18.65 +/- 0. 27Ma and 18.03 +/- 0. 63Ma respectively. It is concluded that the basaltic volcanic activities in the Beiyan paleovolcanic crater ended before about 18. 5Ma. It further suggests that the lacustrine sedimentary rocks containing abundant fossils in the Shanwang Basin unconformably overlying the basaltic rocks from the Beiyan paleovolcanic crater formed later after 18. 5Ma. Ar-40/Ar-39 dating of phlogopites is a new effective method for the dating of basalts containing phlogopite-bearing xenoliths.

洛宁沙坡岭多金属矿赋存于花山岩体与太华群变质岩的外接触带附近,上宫—小池沟地球化学异常带的东延部分,区内已发现金、铁、铜、钼的矿化,热液活动纷繁复杂,蚀变强烈。本文采用地质观察、伽玛能谱测量、偏提取化探、地面高精度磁测等方法对研究区进行了初步勘查,结果表明该区存在广阔的找矿前景。