共查询到20条相似文献，搜索用时 312 毫秒
1.
云英岩主要是由白云母、石英、黄玉、电气石、萤石以及锡石、黑钨矿等矿物组成的浅色蚀变岩石。本文只讨论主要由白云母、石英、黄玉、锂电气石和萤石所组成的云英岩的蚀变类型、蚀变带序、蚀变带和成岩格子。 相似文献
2.
内蒙古敖脑达坝斑岩型铜银锡多金属矿床围岩蚀变特征研究 总被引：1，自引：0，他引：1
在给出明确的命名原则基础上，将矿床的蚀变围岩划分为五类：黄玉石英交代岩、绿泥石石英交代岩、绢云母石英交代岩、电气石绿泥石化花岗斑岩、钾长石化花岗斑岩。在平面上岩体中心部位为黄玉石英蚀变带，其两侧为绿泥石石英蚀变带；在剖面上由上向下依次出现绿泥石石英蚀变带→黄玉石英蚀变带→绢英岩化带→钾化带→（电气石）绿泥石化带。从蚀变岩石地球化学角度阐述了铜银锡各自不同的成矿部位。 相似文献
3.
界牌岭锡矿床蚀变矿化分带及其成因探讨 总被引：2，自引：0，他引：2
湖南界牌岭锡矿床蚀变矿化可分为条纹状云母萤石岩化—铍矿化带,细脉状云母萤石化—铅锌矿化带、黄玉—萤石—云英岩化—锡铜锌多金属矿化带和弱—无蚀变矿化带.不同蚀变矿化带物质组分迁移规律有不同的特点.其成矿物质主要来源于花岗斑岩,该矿床是与陆壳重熔型花岗岩类斑岩体有成因联系的斑岩型锡矿床. 相似文献
4.
大义山岩体内云英岩化电气石化的找矿意义 总被引：1，自引：0，他引：1
大义山复式岩体内发育的云英岩脉和电英岩脉,锡矿化较强。而鳞云母黄玉云英岩、电气石云英岩、白云母云英岩、电英岩、蚀变细粒花岗岩、云英岩－似伟晶岩,亦与锡多金属矿密切有关。显而易见,云英岩化和电气石化是大义山岩体内锡矿的最佳找矿标志。 相似文献
5.
侵入奥陶纪下部硬砂岩和页岩的‘S’型巴里汤黑云母花岗岩体在接近其原始顶板位置出露地表。该岩体从富黑云母的边缘至酸性的核部呈内部分带现象。影响很大一部分岩体的弱弥漫型热液蚀变由三种有明显区别的类型组成:早期绿磐岩化(绿泥石-绢云母±斜黝帘石、榍石)集中于北西-南东走向的、当时尚有余温的岩体核部上方,而其后的中性泥质蚀变(高岭石、伊利石-电气石)发育于顶板接触带附近,这是由于捕获和凝聚酸性挥发分造成的。石英-电气石脉及与其有关的云英岩边(花岗岩中的石英-白云母-金红石,变质沉积岩中的石英-白云母-电气石)仅见于绿磐岩的中央斜黝帘石-榍石部分,并且明显地晚于后者生成。它们含有少量的白钨矿和很少的黑钨矿、锡石、辉钼矿和黄铜矿。在黑云母蚀变过程中,丰富的钛相矿物可能在原地捕获岩浆的锡和钨,这阻碍了有效的淋滤和矿石的富集。 相似文献
6.
《华南地质与矿产》2017,(3)
湖南崇阳坪地区寨溪山钨矿床属于中型石英脉型白钨矿床。矿区内围岩蚀变作用强烈,蚀变分带明显,依据蚀变岩岩相学及岩石化学测试结果,并结合钻孔编录资料,将矿区围岩蚀变划分为3种类型的蚀变带:(1)电气石化→钾长石化→云英岩化→花岗岩;(2)电气石化→硅化→云英岩化→钾长石化边→花岗岩;(3)硅化花岗岩→花岗岩。钨矿化主要赋存在钾长石化、电气石化、云英岩化蚀变花岗岩中。蚀变带物质组分迁移结果表明,在蚀变过程中,主量元素除Ti O2、Mn O、Mg O外,其他元素迁移量发生了明显的改变,尤其是Si O2、Al2O3、K2O、B等元素富集或亏损明显,W在钾长石化、电气石化蚀变花岗岩中富集明显。 相似文献
7.
8.
重熔斑岩型锡多金属矿床具有明显的蚀变、矿化分带性,由含矿岩体向外(或从深部到地表)蚀变分带依次为:碱性长石化带→黑鳞云母云英岩化带→黄玉云英岩化带→绢英岩化带→硅化带→似青盘岩化带;矿化分带为:钨(锡、钼、铜)→锡(钼、铋、锌)→钼(锡、铅、锌)→铅、锌(银、锡)。前两个矿化带与黄玉云英岩化带关系十分密切,钼矿化带与绢英岩化带和硅化带有关,铅—锌矿化带主要产于硅化带与似青盘岩化带叠加部位。 相似文献
9.
10.
斑岩型钼矿床围岩蚀变分带特征,是重要的找矿标志。在前人研究的基础上,总结了黑龙江省大兴安岭岔路口钼多金属矿床的围岩蚀变分带特征。围绕主成矿岩体——含斑细粒花岗岩和花岗斑岩体由内向外划分为4个蚀变带:(石英-)钾长石化带(Q-Kf)、石英-绢云母-水白云母化带(Q-S-H)、泥化带(伊利石-水白云母-黏土-弱硅化带)(Q-I-H)、青磐岩化带(C-E-Cc)。探讨了蚀变与矿化的关系。强硅化与早期交代的石英-钾长石化带叠加部位,赋存高品位钼矿体;中期交代的石英-绢云母化带叠加石英-钾长石化带部位,赋存层状钼矿体;强硅化叠加晚期交代的青磐岩化带-泥化带部位,赋存独立脉状铅锌矿脉(化)。正确划分蚀变带对区域上寻找斑岩型钼(铜)矿床具有参考价值。 相似文献
11.
Abstract. Vein type tungsten mineralization at Degana is genetically and spatially associated with the Degana Granite. The deposit is characterized by pervasive wall rock alteration around the mineralized quartz veins. Laterally three different alteration zones, greisen, silicification and potassic zones, are marked based on the field features, mineral assemblages and geo-chemical characteristics. In the present paper, systematic mineralogical and chemical variation in these alteration zones is reported. Thick mono-mineralic (zinnwaldite) selvages around the veins characterize the deposit. Plagioclase and alkali feldspar are low in the greisen zones while K-feldspar shows more increase than plagioclase in the potassic zone. Quartz is uniformly high in all the alteration zones, but it shows an anomalous value in the silicification zone. Al2 O3 concentration shows initial depletion in greisen zone with gradual increase away from the contact. MgO and FeO are higher in greisen zone than silicification and potassic zones. The potassic zone is characterized by the depletion of Na2 O and higher value of K2 O.
The common presence of topaz and fluorite as both primary and secondary minerals and fluorine-bearing micas suggest fluorine partitioning in substantial amount between granitic melt and coexisting aqueous fluid phase and higher HF activity during the evolution of hydrothermal fluid. The mutual relationship of the fluorine minerals (topaz and fluorite) in the different alteration zones suggests an increase in the Ca2+ activity and decrease of H+ activity during the fluid evolution from greisenization towards alkali-metasomatised granite and the fluid is assumed to change from low to high activity ratio of Ca2+ /H+. 相似文献
The common presence of topaz and fluorite as both primary and secondary minerals and fluorine-bearing micas suggest fluorine partitioning in substantial amount between granitic melt and coexisting aqueous fluid phase and higher HF activity during the evolution of hydrothermal fluid. The mutual relationship of the fluorine minerals (topaz and fluorite) in the different alteration zones suggests an increase in the Ca
12.
湖南骑田岭芙蓉锡多金属矿田锡的赋存状态及迁移形式 总被引：1，自引：0，他引：1
芙蓉矿田锡矿床按成因可分为构造蚀变带-矽卡岩复合型、构造蚀变带型、蚀变岩体型、矽卡岩型、脉状云英岩型等五种类型。各类型矿体中锡主要以锡石锡的形式出现,其分布率由92.17~97.77%,硫化锡、胶态锡、硅酸锡的分布率<8%。锡元素在钠长石化成矿作用阶段,很可能是以氧的络阴离子SnO33-、氢氧络阴离子〔Sn(OH)6〕2-的形式迁移;在云英岩化成矿作用阶段,主要以氟的络合物,如Na2SnF6,Na2〔Sn(OH、F)6,〕SnF4,K2SnF6等形式搬运;到了绿泥石化锡石硫化物阶段,锡又以硫化锡酸盐、硫化物(Na2SnS3,SnS2,SnS)和氯的络合物(Na2SnC l6)、氟的络合物等形式进行迁移和搬运。 相似文献
13.
《Chemie der Erde / Geochemistry》2021,81(4):125796
The Jiuyishan complex located at Hunan Province, Jiuyishan district, South China, is composed of five granitic plutons (Xuehuading, Jinjiling, Pangxiemu, Shaziling and Xishan). The Zhengchong Li-Rb-Cs deposit is a greisen-type deposit hosted by the Jinjiling granite, adjacent to the Pangxiemu granitic pluton. Based on textures, three types of greisen may be distinguished at Zhengchong: medium-grained massive greisen, feldspar-phyric greisen and quartz-phyric greisen. Detailed studies on field occurrence, petrographic observations, whole-rock and mineral geochemistry reveals that the Jinjiling granites represent the protoliths of the greisen mineralization and not the Pangxiemu granites. Metasomatic alteration of different phases of the Jinjiling granites formed at least three greisen types mentioned above. The medium-grained greisen and quartz-phyric greisen are totally altered, but the feldspar-phyric greisen are relatively less altered with residual feldspar phenocrysts. We also propose three main indications for ore deposit exploration in this area: future mineral exploration in the district should focus on the periphery of the Pangxiemu pluton, particularly along structures, where greisen alteration has been developed in places. 相似文献
14.
大东山锡矿田矿化类型复杂,其中矽卡岩型锡矿规模大,可分含锡矽卡岩型和硫化物矽卡岩型。岩体区有脉状和面状云英岩产出,前者多具锡矿化,后者具钨矿化。燕山第四期花岗岩是锡(钨)成矿母岩,含SiO274.96%~75.28%,K2O+Na2O7.37%~8.54%,K2O>Na2O,与南岭地区钨锡成矿岩体具有相似的岩石化学特征。锡矿成因类型可划分为接触交代型、侵入岩浆热液型和风化矿床。根据成矿地质条件,认为在接触带寻找硫化物矽卡岩、硫化物型锡矿有较大前景,而在岩体区具有寻找云英岩型钨矿的潜力。 相似文献
15.
藏北商旭造山型金矿床的发现及意义 总被引：4，自引：3，他引：1
西藏双湖县商旭金矿床位于班公湖-怒江缝合带中段。矿体赋存于中-下侏罗统木嘎岗日群浅变质复理石中,受北西西向断裂构造控制,呈透镜体状、脉状,或者似层状产出;矿石矿物以自然金为主,矿石类型为石英脉型和蚀变岩型,围岩蚀变特征明显。该矿床主要受地层及构造因素控制,矿区的构造、围岩蚀变、矿物、地球化学异常等可作为找矿标志。野外地质调查和矿床对比研究显示,商旭金矿床在矿物共生组合、蚀变类型、构造类型等方面,与典型的造山型金矿床相似,其成因类型属于造山型金矿床。商旭金矿床的发现为班公湖-怒江成矿带金等贵金属矿产的地质找矿工作开辟了新的方向。 相似文献
16.
A. J. Tullocb 《矿床地质》1986,5(3):27-36
The 'S' type Barrytown biotite granite pluton which intrades Lower Ordovician greywacke and shales is exposed noar jts original roof level. The pluton is intemally zoned from a biotite-rich margin to an acid core. Mild pervasive hydrothermal alteration which affects much of the pluton comprises 3distinct varietiest; early propylitic alteratiori (chlorite-sericite +clinozoisite, sphene) was concentrated above the NW-SE trending, residially warm pluton core, while later intermediate argillic alteration (kaolinite, illite-tourmaline) developed in the vicinity of roof contacts due to trapping and condensation of acid volatiles. Quartz-tourmaline veins and associated greisen selvedges (quartz-muscovite-rutile in granite, quartz-musccvite-tourmaline in metasediments) are restricted to, and apparently postdate, the central clinozoisite-sphene part of the propylitic zone, and contain minor scheelite and rare wolframite, cassiterite, molybdenite and chalcopyrite. Abundant secondary Ti-phases may have held magmatic Sn, W in situ during alteration of biotite, preventing effective leaching and potential ore concentration. 相似文献
17.
18.
19.
Endogreisen and exogreisen weakly mineralized with Bi, Sn, and Mo are associated with two of three granite porphyry (granite) cupolas hosted in Silurian metasedimentary rocks at True Hill, southwestern New Brunswick. The epizonal, weakly peraluminous and compositionally evolved True Hill granite is quartz and K-feldspar porphyritic; groundmass textures, such as granophyric patches, miarolitic cavities, and pegmatite pods, are indicative of rapid cooling and vapor saturation.The greisen mineralization in cupolas B and C is overprinted by various types of alteration, reflecting multi-stage devolatilization of the magma. The most intense topaz-bearing greisen is confined mainly to the apical parts of the granite. In places, fluorite is associated with silicification, sericitization, and chloritization, which is common to greisen-type alteration. The alteration types reflect the physical and chemical changes in the hydrothermal fluid that was derived principally by second boiling of the magma. Al-normalized, mass-balanced geochemical data supported by petrographic observations show that in the greisenized True Hill granite, Fe, Mn and Mg enrichment corresponds to chlorite and/or Fe-muscovite alteration and are coincident with leaching of Na and K and deposition of SiO2. Ca was remobilized in the greisen environment, but erratically deposited as fluorite. Minor P and LREE enrichment are reflected by the presence of monazite in the greisen. The HFSE are mobile to a minor degree, based on correlations with elements known to be hydrothermally mobile. The base metals correlate with S and other ore-forming elements. The distribution of many of the trace elements is related to alteration, including the leaching of alkalis, which leads to the stabilization of aluminosilicates, principally muscovite and topaz. The distribution of trace elements reflects their relative mobility during greisenization, with high-field-strength elements (Zr and Ti) the most immobile and the lithophile and chalcophile elements the most mobile. Breccias and greisen alteration in cupola C at True Hill are similar to those at the base of the W-Mo-Bi porphyry-greisen in the Fire Tower zone above the Mount Pleasant fine-grained granite. 相似文献
20.
黄县盆地古近系煤与油页岩共生组合类型及发育特征 总被引：1，自引：0，他引：1
黄县盆地是我国东部重要的煤与油页岩资源赋存区。采用沉积学、层序地层学及构造地质学等多种学科研究方法,对黄县盆地煤与油页岩组合类型进行研究,并在层序地层格架下分析不同组合类型的沉积环境演化,这对于该区煤与油页岩资源勘查具有重要意义。研究结果表明:(1)该区煤与油页岩组合类型有四种型式:油页岩/其它沉积/煤层共生组合(煤4-泥岩-油4组合)、煤层/油页岩共生组合(煤3和油3,煤1和油2)、油页岩/煤层/油页岩共生组合(油2-煤1-油1)和油页岩/煤层共生组合(油上1和煤上1)。(2)在黄县断陷盆地古近系地层沉积充填序列中识别出两类三个性质不同的层序界面(SB1、SB2、SB3),其中李家崖组可划分出2个三级层序,各层序具有四元结构特点,即由低水位体系域、湖扩张体系域和早期高水位体系域、晚期高水位体系域组成。(3)黄县盆地古近系煤与油页岩共生组合主要在层序的低位体系域与湖侵体系域中发育,特别是在湖侵体系域中煤与油页岩组合类型丰富,主要与湖侵体系域复杂的沉积环境演化有关。 相似文献