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1.
湖南柿竹园矽卡岩-云英岩型W-Sn-Mo-Bi矿床地质和成矿作用 总被引：7，自引：2，他引：7
柿竹园钨多金属矿床由三个阶段不同成矿作用复合叠加而形成。它们分别与似斑状黑云母花岗岩、等粒黑云母花岗岩和花岗斑岩脉有着成因联系。第一阶段矿化包括含矿块状外质矽卡岩和含矿退化蚀变岩；第二阶段为云英岩矿化，在空间上叠加于块状矽卡岩及外部的大理岩；第三阶段为与锰质矽卡岩相伴生的铅锌银矿化。本文详细地描述了前两阶段矿化的地质和成矿地球化学特征，并探讨了其成矿过程。在此基础上，建立了柿竹园矿床的多阶段成矿模 相似文献
2.
内蒙古朝不楞铁铜锌铋矿床位于二连浩特-东乌旗多金属成矿带的东段,其矿化蚀变沿着花岗岩体与围岩的接触带分布。在外接触带,大理岩热液蚀变形成了进化矽卡岩,由石榴子石、辉石、硅灰石和方解石组成,泥质砂岩蚀变成角岩,由角闪石、黑云母、长石和石英组成。矽卡岩或角岩经退化蚀变形成了铁氧化物矿化,由磁铁矿、磁赤铁矿和镜铁矿组成,伴随有绿帘石、方解石、萤石和黑云母蚀变;晚期热液退化蚀变形成了硫化物,由黄铜矿、白铁矿、黄铁矿、辉钼矿、闪锌矿、辉铋矿和自然铋组成,伴随有透闪石、绿泥石、萤石、石英和方解石蚀变。在内接触带,花岗岩的热液蚀变形成了钾化,由钾长石、黑云母和少量石榴子石组成,随后被退化绿帘石、方解石和少量磁铁矿交代;晚期退化蚀变形成了硫化物脉,伴随有黑云母、方解石、石英和萤石蚀变。流体包裹体爆裂温度结果表明,该矿床形成于浅成（1.7~3.5 km）、高温环境,成矿热液具有从高温向低温多阶段演化的冷却史。矿床的地质、矿物组合特征及成矿物理化学条件显示出该矿床属于浅成、高温、近端的矽卡岩型矿床。 相似文献
3.
Geological and fluid inclusion studies of the Dongpo tungsten skarn ore deposit,China 总被引：1，自引：0，他引：1
The Dongpo tungsten ore deposit, the largest scheelite skarn deposit in China, is located at the contact of a 172-m. y. biotite
granite with a Devonian marble. The mineralization associated with the granite includes W, Bi-Mo, Cu-Sn and Pb-Zn ores. Several
W mineralization stages are shown by the occurrence of ore in massive skarn deposits and in later cross-cutting veins. The
high garnet/pyroxene ratio, the hedenbergite and diopside-rich pyroxene and the andradite-rich garnet show the deposit belongs
to the oxidized skarn type. Detailed fluid inclusion studies of granite, greisen, skarn and vein samples reveal three types
of fluid inclusion: (1) liquid-rich, (2) gas-rich and (3) inclusions with several daughter minerals. Type (3) is by far the
most common in both skarn and vein samples. The dominant daughter mineral in fluid inclusions is rhembic, highly birefringent,
and does not dissolve on heating even at 530°C. We assume that this mineral is calcite. The liquid phase in most of the fluid
inclusions has low to moderate salinities: 0–15 wt. %; in a few has higher salinities (30–40 wt. % NaCl equivalent). The homogenization
temperatures of inclusions in the skarn stage range from 350°C to 530°C, later tungsten mineralization-stage inclusions homogenize
between 200°C and 300°C, as do inclusions in veins. Fluid inclusions in granite and greisen resemble those of the late tungsten
mineralization stage, with low salinity and homogenization temperatures of 200°–360°C. The tungsten-forming fluids are probably
a mixture that came from biotite granite and the surrounding country rocks. 相似文献
4.
江西永平铜矿床蚀变矿化分带、矿石组构及成矿过程 总被引：2，自引：0，他引：2
江西永平铜矿床位于江山-绍兴断裂带南缘、北武夷山燕山早期岩浆岩与海西期-印支期信江断裂坳陷带接合带,是一个伴生S-W-Pb-Zn多矿种的层状铜矿床。逆冲推覆构造控制着矿区内晚古生代地层、燕山期岩浆岩及矿体的空间分布,即基底周潭群逆冲推覆到晚古生界地层上,燕山早期黑云母花岗岩-花岗闪长岩、石英斑岩、花岗斑岩等沿逆冲推覆断面侵入,矿体呈层状产在矽卡岩化石炭系叶家湾组中。矿体围岩主要是石榴石矽卡岩、千枚状页岩及矽卡岩化大理岩。本文从矽卡岩分带、矿石组构等方面来刻画永平铜矿成矿精细过程。永平铜矿矿区的探采工程揭示,以火烧岗岩体为中心向外,蚀变矿物组合、石榴石颜色及矽卡岩的含矿性等表现出明显的分带规律,即从岩体到围岩有:石榴石→透辉石→硅灰石矽卡岩矿物分带;红色→棕色→绿色的石榴石颜色分带;矽卡岩含矿性先增加后降低,其中矿体主要在(红)棕色石榴石矽卡岩呈条带状或网脉状产出。矽卡岩型和变质砂页岩型矿石的矿石矿物组成均与硫化物-石英大脉(～10m)中矿石矿物组成相同或相似,均为黄铁矿-白钨矿-(方铅矿)-闪锌矿-黄铜矿,且生成顺序一致,说明矿区内不同类型的矿石是同一成矿热液体系在不同围岩类型及控矿构造中的产物。永平铜矿成矿过程可划分为石榴石、(磁)赤铁矿阶段、白钨矿阶段、铁铜硫化物阶段、铅锌硫化物阶段和碳酸盐阶段等六个阶段,其中石榴石阶段形成矽卡岩分带,在该阶段晚期形成磁黄铁矿-铁闪石-(黄铜矿)-石英块状矿石;(磁)赤铁矿阶段发育磁铁矿、赤铁矿;白钨矿阶段形成白钨矿及少量黑钨矿;铁铜硫化物阶段是铜硫矿主要矿化阶段,形成块状及脉状黄铜矿矿石;铅锌硫化物阶段是成矿晚期阶段;碳酸盐阶段代表原生成矿过程结束。 相似文献
5.
The skarn‐type tungsten deposit of the Date‐Nagai mine is genetically related to the granodiorite batholith of the Iidateyama body. Skarn is developed along the contact between pelitic hornfels and marble that remains as a small roof pendant body directly above the granodiorite batholith. Zonal arrangement of minerals is observed in skarn. The zonation consists of wollastonite, garnet, garnet‐epidote, and vesuvianite‐garnet zones, from marble to hornfels. Sheelite is included in garnet, garnet‐epidote, and vesuvianite‐garnet zones. The oxygen isotope values of skarn minerals were obtained as δ18O = 4.2–7.7‰ for garnet, 5.9–6.9‰ for vesuvianite, ?0.3–3.4‰ for scheelite, 6.0–10.9‰ for quartz, and 8.2‰ for muscovite. The temperature of skarn‐formation was calculated from oxygen isotopic values of scheelite‐quartz pairs to be 288°C. Calculated oxygen isotope values of fluid responsible for skarn minerals were 6.1–9.5‰ for garnet, 1.2–4.8‰ for scheelite, ?1.3‐3.6‰ for quartz, and 4.5‰ for muscovite. Garnet precipitated from the fluids of different δ18O values from scheelite, quartz, and muscovite. These δ18O values suggest that the origin of fluid responsible for garnet was magmatic water, while evidence for the presence of a meteoric component in the fluids responsible for middle to later stages minerals was confirmed. 相似文献
6.
湖南东坡矿田金船塘、红旗岭锡多金属矿床Rb-Sr、Sm-Nd同位素年代学研究 总被引：5，自引：0，他引：5
与千里山岩体有密切时空联系的东坡矿田是我国主要钨锡多金属矿产资源基地之一。在前人对千里山复式岩体成岩时代和金船塘与千里山岩体第一期似斑状花岗岩侵入活动有关的成矿作用研究的基础上,笔者选择金船塘及红旗岭矿床含矿石英脉中的石英和金船塘矿床矽卡岩矿石中的单矿物,进行石英流体包裹体Rb-Sr和矽卡岩矿物(包括符山石和石榴石)Sm-Nd同位素年代学研究,得出金船塘及红旗岭矿床石英流体包裹体Rb-Sr等时线年龄分别为133.4±5.9 Ma(MSWD=1.3)和143.1±8.7 Ma(MSWD=47),金船塘矿床矽卡岩矿物Sm-Nd等时线年龄为141±11 Ma(MSWD=0.27)。同位素年代学研究表明金船塘矿床至少存在164 Ma±、133~141 Ma两期成矿作用,在测定误差范围内,它们分别与千里山岩体第一期似斑状花岗岩(152 Ma)和第二期等粒黑云母花岗岩(136~137Ma)的侵入活动有关,而红旗岭矿床的成矿作用与千里山岩体第二期岩浆侵入活动有关。 相似文献
7.
8.
安徽贵池铜山矽卡岩型铜矿床蚀变矿化分带特征及其成因 总被引：6，自引：1，他引：5
铜山矽卡岩型铜矿床产于长江中下游铁铜成矿带中的安庆—贵池矿集区。研究区矽卡岩化与矿化发生于碳酸盐岩地层与花岗闪长斑岩间的接触带中,蚀变及矿化具有水平与垂向分带特征。水平方向上,靠近岩体的矽卡岩中石榴子石含量较高,远离岩体的矽卡岩中透辉石含量较高;靠近大理岩带发育钙铁辉石矽卡岩,远离大理岩带的灰岩硅化较强。垂向上,从上到下依次为角岩带、钙质矽卡岩带和镁质矽卡岩带。矿物成分研究表明,靠近岩体处氧化性较强,石榴子石的钙铁榴石端员含量高;铜多富集于含石英脉的岩体、距岩体略远的矽卡岩、角岩或大理岩中,而锌多富集于硅化灰岩及远离岩体的矽卡岩中。研究表明,该矿床中蚀变矿化经历了进变期和退变期,包括接触热变质阶段、进化交代阶段和早退化蚀变阶段、晚退化蚀变阶段。其中,大规模的黄铜矿化主要发生于早退化蚀变阶段,且在岩浆演化晚期进一步富集于斑岩石英脉中。 相似文献
9.
Shao-Cong Chen Jin-Jie Yu Min-Feng Bi Bernd Lehmann 《Chemie der Erde / Geochemistry》2022,82(1):125856
It remains poorly constrained whether remobilization of Sn from granites and prograde skarns plays an essential role in forming economic (skarn-type) tin mineralization. Using both electron probe microanalysis and laser ablation–inductively coupled plasma–mass spectrometry methods, in-situ Sn contents, as well as major elements, were analyzed for numerous silicates and magnetite from fresh granite, altered granite, and skarn at the large Furong Sn deposit (530,000 t Sn @ 0.8% Sn) in the Nanling Range, South China. Hornblende and biotite in fresh granite are the main Sn-bearing phases (Sn = 44–321 ppm), while plagioclase and K-feldspar are poor in Sn (< 5 ppm). In altered granite, tin is hosted mainly by hydrothermal muscovite (299–583 ppm) replacing plagioclase, but rarely by chlorite (mostly <10 ppm) replacing hornblende and biotite. In contrast, most silicates (garnet, diopside, vesuvianite, pargasite and epidote) and magnetite from tin skarn are Sn-rich (47–44,241 ppm), except for Sn-poor phlogopite and scapolite (< 10 ppm). In particular, garnet, pargasite, and epidote reach tin concentrations in the percent range. Tin generally enters the stannous silicates and magnetite through substitutions for octahedral Alvi and Fe3+. Comparisons of Sn contents between magmatic and hydrothermal minerals in granite, prograde and retrograde minerals related to tin skarn indicate that remobilization of Sn from granite and prograde skarn is not a pre-requisite to form tin mineralization. 相似文献
10.
浆液过渡态流体在矽卡岩型钨矿成矿过程中的作用——以湖南柿竹园钨锡多金属矿为例 总被引：9，自引：2，他引：7
湖南杮竹园是世界著名的大型矽卡岩型锡钨多金属矿床,产于千里山碱长花岗岩岩体南部接触带。矽卡岩中广泛发育网脉状碱交代脉和少量花岗岩脉、云英岩脉等各类脉体。碱交代脉主体由钾长石、萤石、少量石英、磁铁矿、黑钨矿、白钨矿及花岗岩构成,以往被统称为"云英岩脉"。其中早阶段碱交代脉中央发育花岗岩,边部为钾长石-萤石-黑钨矿,脉体两侧发育石榴子石透辉石矽卡岩化,对应矽卡岩阶段。晚阶段碱交代脉主要成分为钾长石、萤石,脉体及两侧出现大量阳起石、绿帘石、磁铁矿、白钨矿及辉钼矿、辉铋矿、自然铋等,对应退变质氧化物阶段。空间上,碱交代脉分布于矽卡岩和矽卡岩化大理岩中,不进入岩体。自花岗岩体→岩脉→碱交代脉→矽卡岩,Ca O、Ti O2、成矿元素W、Bi、Mo、Cu、Pb、Zn以及Sr、Ba等元素含量增高,显示出成矿元素向热液中富集,且岩浆和矽卡岩受到碳酸盐岩围岩的影响。碱交代脉的组构显示出其形成于富含成矿物质和挥发份流体的岩浆,其中广泛发育熔融包裹体和熔流包裹体,显示其浆液过渡态流体的成因性质。从岩浆晚期分异演化→热液阶段是连续演化的过程,块状云英岩和矽卡岩阶段,岩浆并未完全固结,成矿作用自岩浆固结之前已经开始。总结了杮竹园矿床成矿模型:碱长花岗岩岩浆演化晚期分异出的高度富含挥发份的熔浆,在岩体顶部聚集,部分形成似伟晶岩(壳)和块状云英岩以及条带状硅灰石符山石矽卡岩。进一步聚集以及矽卡岩化产生大量CO2引起大规模隐爆,富含挥发份的岩浆或浆液过渡态流体沿隐爆形成的碎裂裂隙进入碳酸盐岩围岩,与碳酸盐岩不断发生反应,在脉体边部形成钾长石化以及大范围的石榴子石透辉石矽卡岩化。至退变质氧化物阶段,随着岩浆冷凝和温度、压力的降低,地下水大范围参与,成矿流体逐渐转变为热液性质,形成大量阳起石、磁铁矿、白钨矿及钼、铋硫化物。硫化物阶段,大量的大气降水参与成矿,温度、盐度进一步降低,在矽卡岩及其外侧的碳酸盐岩中形成铅锌硫化物矿石。 相似文献
11.
白石砬子白钨矿床产于下古生界青龙村群大理岩与华力西晚期黑云母斜长花岗岩接触带内;矿体呈脉状、扁豆体产出,受北东向断裂构造和接触带构造控制明显;赋矿岩石以石榴石矽卡岩为主,矿石中金属矿物以白钨矿为主,其次为黄铜矿、磁黄铁矿、黄铁矿等,非金属矿物有钙铝石榴石、钙铁辉石、透辉石、绿帘石、方解石、石英。矿床特征及与国内典型矿床对比分析表明,白石砬子矿床的成因类型属接触交代型白钨矿矿床。青龙村群大理岩、海西华力西晚期花岗岩体、北东向断裂和接触带构造对该矿床形成具有重要控制作用,矿区及外围具有较大的成矿潜力和找矿远景。 相似文献
12.
湘南柿竹园矽卡岩型-云英岩型钨多金属矿田是中国最重要的钨多金属矿产资源基地之一。前人对该矿田的矽卡岩型成矿开展了系统的研究,而对矿田内云英岩型钨矿化研究薄弱,制约了矿田内成矿理论的认识和矿产勘查部署。通过野外调查,文章系统总结了矿田内云英岩型矿化样式、空间分布、矿化特征和控矿因素。研究显示柿竹园矿田内云英岩型矿体包含4种矿化样式：第一期斑状黑云母花岗岩中云英岩型矿体、石英斑岩中云英岩型矿体、第二期黑云母花岗岩中云英岩型矿体和矽卡岩-网脉状云英岩复合型矿体。这4种样式的云英岩型钨多金属矿体是柿竹园矿田内不同阶段的花岗岩成矿的产物。白钨矿化学成分显示矽卡岩型矿化的白钨矿低Mo,而云英岩型矿化白钨矿富Mo,指示云英岩矿化较矽卡岩矿化具有更氧化的环境。柿竹园矿田矿化格局显示云英岩型矿化受矿田和矿床尺度的花岗岩体侵位前锋控制,矿田尺度表现为岩体由北东深部向南西浅部侵位,千里山岩体南部为岩体侵位的前锋,岩体南部发育较大规模的云英岩矿体;矿床尺度上,云英岩体的定位受控于花岗岩岩突的控制。此外,矿田菱形格状构造对岩突产出位置具有重要的控制作用,也具有重要勘查指示意义。结合矿田控矿构造格局、不同期次岩浆岩对云英岩的控制及地球化学异常特征,笔者提出了大吉岭、柿竹园深部和柴山深部3处云英岩型钨多金属矿找矿预测靶区。 相似文献
13.
The Tongshan skarn-type copper deposit is located in the Anqing–Guichi ore cluster of the iron–copper metallogenic belt which occurs along the Middle–Lower Yangtze River Valley, China. In the study area, skarnization and mineralization took place along the contact zone between carbonates and granodiorite porphyries. The contact zone shows significant horizontal and vertical variations in alteration and mineralization. In the horizontal direction, the garnet content is high in the skarns near the intrusive body (proximal skarns), the diopside content is high farther from the intrusive body (distal skarns), and hedenbergite is concentrated in the skarns adjacent to the marble zone. Limestones located far from the marble zone experienced a strong silicification. In the vertical direction (from higher to lower levels), the rocks change from hornfels to calcareous skarn to magnesian skarn. Mineralogical studies show that the skarns near the intrusion are relatively oxidized, and the garnet in the skarns is relatively andradite rich. High concentrations of Cu are found in the porphyries with quartz veins, as well as in the calcic skarns, magnesian skarns, hornfelses, and marbles, which are located at distances of 13, 10, 43 and 25 m from the porphyries, respectively. High concentrations of Zn are found in silicified limestones and skarns located even farther from the porphyries. The present findings suggest that the Tongshan deposit was subjected to prograde alteration and mineralization, followed by retrogression. The alteration can be divided into a sequence of stages: contact metamorphism, prograde metasomatism, early retrogression, and late retrogression. The copper mineralization occurred mainly during the early retrogression, and the copper was further enriched in quartz veins within the porphyries during the late stages of magma evolution. 相似文献
14.
江西香炉山大型钨矿床位于长江中下游成矿带南侧新识别的钨矿带西段,为一矽卡岩型白钨矿床.矽卡岩矿体主要产于中寒武统杨柳岗组含炭质灰岩和香炉山花岗岩接触部位.香炉山花岗岩具有细粒至中粗粒结构,主要由石英、钾长石、斜长石和黑云母组成,副矿物以钛铁矿为主.香炉山花岗岩的SiO2含量为66.37％～67.76％,并具有较高的Na... 相似文献
15.
青海江里沟钨多金属矿床目前是青海境内规模最大的钨矿床,其规模达中-大型,大地构造位置属秦祁昆复合造山系秦岭造山带西段。本文从江里沟钨多金属矿床的成矿地质背景、矿区地质特征、矿体特征等方面入手,总结矿床控矿因素及矿化富集规律。矿体受岗察复式花岗岩体与围岩接触带控制,矿化围绕岩体具有明显的分带性,自岩体向外形成了斑岩型钼矿化-云英岩型钨矿-矽卡岩型钨铜钼矿-角岩型钨矿-脉状铅锌矿的矿化系列,以矽卡岩型为主要类型。其矿床成因为与晚三叠世江里沟复式花岗岩体晚阶段花岗斑岩和细粒花岗岩的侵入及岩浆后期热液有关的多位一体矿床,为下一步的找矿提供依据。 相似文献
16.
The Pemali tin deposit is located in a Triassic granite pluton the magmatic evolution of which is characterized by a decrease of compatible Ca, Mg, Ti, P and Zr in the sequence: medium- to coarse-grained biotite granite, megacrystic medium-grained biotite granite, two-mica granite/muscovite granite. The tin mineralization is confined to the two-mica granite and consists of disseminated cassiterite as well as greisen-bordered veins. The highly evolved muscovite granite is tin-barren and is distinguished from the two-mica granite by its low mica content and low loss-on-ignition values. The fluid inclusions in quartz and fluorite of the two-mica granite and of the greisen homogenize in the 115–410 °C temperature range; the salinities are in the range of 0.4–23 equiv wt% NaCl and the CO2 concentrations are < 2 mole%. 相似文献
17.
Petrological and geochemical evolution of the Kymi stock, a topaz granite cupola within the Wiborg rapakivi batholith, Finland 总被引：5，自引：0，他引：5
The 6×3 km Kymi monzogranite stock represents the apical part of an epizonal late-stage pluton that was emplaced within the 1.65 to 1.63 Ga Wiborg rapakivi batholith. The stock has a well-developed zonal structure, from the rim to the center: stockscheider pegmatite, equigranular topaz granite, porphyritic topaz granite. The contact between the two granites is usually gradational within a few centimeters, but local inclusions of the porphyritic granite in the equigranular granite indicate that the latter solidified later. Hydrothermal greisen and quartz veins, some of which contain genthelvite, beryl, wolframite, cassiterite, and sulfides, cut the granites of the stock and the surrounding country rocks. The equigranular granite contains 1 to 4 vol.% topaz, and its biotite is lithian siderophyllite; the porphyritic granite has 0 to 3 vol.% topaz, and the mica is siderophyllite. The equigranular granite is geochemically highly evolved with elevated Li, Rb, Ga, Ta, and F, and very low Ba, Sr, Ti, and Zr. The REE patterns show deep negative Eu anomalies and tetrad effects indicating extreme magmatic fractionation and aqueous fluid–rock interaction. The zonal structure of the stock is interpreted as a result of differentiation within the magma chamber. Internal convection in the crystallizing magma chamber and upward flow of residual melt as a boundary layer along sloping contacts resulted in accumulation of a layer of highly evolved, volatile-rich magma in the apical part of the chamber. Crystallization of this apical magma produced the stockscheider pegmatite and the equigranular granite; the underlying crystal mush solidified as the porphyritic granite. Much of the crystallization took place from volatile-saturated melt, and episodic voluminous degassing expelled fluids into opened fractures where they or their derivatives reacted with country rocks and caused alteration and mineralization. 相似文献
18.
通过详查评价，提高了对矿床地质特征的研究程度。在继续肯定矿床的成矿严格受张堰花浆长岩体与金群的接触带控制的同时，对矿床的主要赋矿地层即外接带金山群的分层，构造其各类岩性组成在矿过程中的作用进行了详尽的厘定。 相似文献
19.
位于江南造山带东部的江西朱溪钨矿,是近年发现的一个超大型钨矿床,其矿体主要由矽卡岩型白钨矿组成,产于
燕山期侵入岩与碳酸盐岩接触带的矽卡岩或矽卡岩化大理岩中。为了更好地认识朱溪钨矿的特征和成因,文章采集了花岗
岩和矽卡岩的钻孔样品,进行了岩石学、矿物学、岩石地球化学和同位素年代学的分析。研究表明,朱溪矿区的黑云母花
岗岩具有高硅、富碱、高分异的特征,属于钙碱性、过铝质花岗岩,微量元素中Rb,U,Ta等元素富集,Ba,Nb,Sr和Ti
等元素亏损。稀土元素总量偏低,轻稀土相对富集。矽卡岩矿物的电子探针成分结果表明,其中石榴子石主要为钙铝榴
石-钙铁榴石端元组分;单斜辉石以透辉石-钙铁辉石系列为主。与白钨矿密切共生的矽卡岩矿物中,萤石、符山石、磷灰
石和榍石等富氟的矿物大量出现,表明朱溪钨矿成矿流体为富氟体系,这有利于钨的运移和沉淀。白钨矿REE配分曲线及
Mo含量变化所反映的流体性质表明,朱溪钨矿在矽卡岩阶段,总的矿化环境则由氧化向还原环境变化。利用朱溪含矿矽卡
岩中榍石进行了原位LA-ICP-MS U-Pb定年,206Pb/238U加权平均年龄为153±2 Ma,结果显示朱溪钨矿的成矿时代为晚侏罗
世,属燕山期岩浆活动后的产物。 相似文献
20.
松山锡矿位于滇西临沧花岗岩基的西北侧。矿体主要赋存于临沧黑云母二长花岗岩与松山组绢云石英片岩接触带矽卡岩以及花岗岩和围岩的裂隙中。由于缺乏精确的成矿年代学数据,在一定程度上限制了对矿床成因的认识,并制约了进一步的找矿勘查工作。本文首次利用LA-SF-ICP-MS微区原位U-Pb同位素测年技术对松山锡矿床矽卡岩型和电气石石英脉型矿石中的锡石矿物开展了 U-Pb年代学研究获得2件锡石样品的~(207) Pb/~(206)Pb-~(238) U/~(206) Pb谐和年龄分别为76.6±1.5Ma和79.6±3.6Ma,说明松山锡矿锡的成矿作用主要发生在晚白垩世,与临沧花岗岩主体侵位时间(三叠纪)明显不同。结合地质特征和前人年代学研究成果本文认为该地区存在明显的晚白垩世锡的成矿事件,研究区下一步的找矿工作应围绕岩体与围岩接触带,以及岩体和围岩中的断裂展开。 相似文献