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1.
大宝山多金属矿田矿床类型及成矿作用探讨 总被引：3，自引：0，他引：3
问题的提出大宝山是一个大型的多金属矿田,成矿地质条件复杂,具有多种成因的矿床类型,早在国内享有盛名.六十年代,许多人将大宝山矿床归属于碳酸盐岩中沿层交代的高中温热液交代矿床,花岗闪长斑岩是形成母岩.后来,有人提出次英安斑岩是成矿母岩.近年来又有“层控矿床”、“沉积成矿热液叠加的复生矿床”“海底火山沉积-断裂凹陷型黄铁矿型铜矿”、“海底火山喷发沉积-热液叠加改造复生矿床”“火山成因块状硫化物矿床”、“地台型火山成矿作用的火山喷发异地沉积改造矿床”种种说法.随着矿床的开发,地质勘探工作的深入,许多新的地质事实表明,大宝山是一个复成矿床.本文试从多源成矿和不同的成矿作用来阐述矿床类型,进而对成矿作用过程进行探讨. 相似文献
2.
江西冷水坑矿田具有浅部斑岩型矿体与深部层状矿体的复杂组合。深部的层状矿体曾被长期认为是受构造破碎带控制的"层控叠改型矿体",与斑岩型矿体同期形成。本文从矿床的基本地质特征入手,论述和分析了层状银铅锌矿体所具有的火山碎屑建造及成矿特点,认为矿床具有三期成矿特点,层状矿体属火山机构控制的以火山集块-角砾岩层为赋矿岩石的火山喷发-沉积成岩矿体。提出了该矿床火山构造-岩浆喷发成矿系统的主要成矿要素和成矿模式,斑岩岩浆就位及其流体活动,在产生大规模斑岩型矿化的同时,对早期的火山沉积碳酸盐层进行叠加改造而形成了与斑岩具有成因联系的层控铅锌银矿床。 相似文献
3.
吉林延边地区中生代火山岩金铜成矿系列及区域成矿模式 总被引：1，自引：0，他引：1
延边地区为我国东部滨太平洋的一个重要金、铜 - (多金属 )矿化集中区。成矿带在时、空和物质组成上主要受控于中生代火山 -岩浆侵入作用 ,形成多种金、铜矿床类型组合的成矿带。在分析成矿带内不同矿床成因类型的基础上 ,建立了该成矿带的成矿系列 ,即斑岩铜钼、火山热液金银、次火山热液金银铅锌成矿系列。将成矿系列控矿条件和火山 -岩浆侵入作用相结合 ,探讨成矿系列的构造环境和成矿模式 相似文献
4.
该文以老君山锡多金属成矿区为研究对象,根据与成矿相关的地质作用的组合特征（加里东期火山喷流沉积成矿作
用、印支期区域变质作用和燕山期花岗岩叠加改造成矿作用）,厘定了三大成矿系列。通过不同成矿系列矿床的稀土元素地
球化学对比研究,发现各成矿系列矿床的稀土元素配分模式具有明显区别如下：Ⅰ. 加里东期海底火山喷流沉积-印支期变
质成矿系列,分布于老君山花岗岩体的北东部外围,其稀土元素配分模式与海相火山喷流沉积岩(岛弧拉斑玄武岩)类似;
Ⅱ. 加里东期海底火山喷流沉积-印支期变质-燕山期花岗岩热液叠加改造成矿系列,分布于老君山花岗岩接触带附近,具
海底火山喷流沉积岩和花岗岩并存的稀土元素配分模式;Ⅲ. 燕山期花岗岩热液成矿系列,位于老君山花岗岩体及接触带,
其稀土元素配分模式与地壳重熔型花岗岩一致。 相似文献
用、印支期区域变质作用和燕山期花岗岩叠加改造成矿作用）,厘定了三大成矿系列。通过不同成矿系列矿床的稀土元素地
球化学对比研究,发现各成矿系列矿床的稀土元素配分模式具有明显区别如下：Ⅰ. 加里东期海底火山喷流沉积-印支期变
质成矿系列,分布于老君山花岗岩体的北东部外围,其稀土元素配分模式与海相火山喷流沉积岩(岛弧拉斑玄武岩)类似;
Ⅱ. 加里东期海底火山喷流沉积-印支期变质-燕山期花岗岩热液叠加改造成矿系列,分布于老君山花岗岩接触带附近,具
海底火山喷流沉积岩和花岗岩并存的稀土元素配分模式;Ⅲ. 燕山期花岗岩热液成矿系列,位于老君山花岗岩体及接触带,
其稀土元素配分模式与地壳重熔型花岗岩一致。 相似文献
5.
江西冷水坑火山-侵入杂岩LA-ICP-MS锆石U-Pb年龄及地质意义 总被引：3，自引：0，他引：3
江西冷水坑矿田是武夷山地区重要的银铅锌矿集中区之一,以斑岩型矿床和火山沉积-热液改造型矿床为特色,前人对冷水坑矿床的成岩成矿作用、控矿构造、成矿模式等开展了大量的研究,但对不同地质体与成矿的先后关系、岩浆活动期次与成矿作用的关系研究相对薄弱。本文对打鼓顶组火山岩和含矿花岗斑岩进行了激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)锆石U-Pb年代学研究,结果表明打鼓顶组底板、顶板晶屑凝灰岩形成时代分别为161.3±1.3 Ma、160.75±0.96 Ma,含矿花岗斑岩形成时代为168.09±0.80 Ma,结合以往研究资料,将冷水坑矿田火山-侵入岩岩浆活动划分为3个期次:第Ⅰ期火山-侵入岩浆活动形成于164~170 Ma;第Ⅱ期火山-侵入岩浆活动发生于157~161 Ma,为火山沉积-热液改造型矿床和斑岩型矿体的主要成矿时代,岩浆活动和成矿时代基本一致;第Ⅲ期火山-侵入岩浆活动时限为140~146 Ma。也暗示华南冷水坑等地晚侏罗世火山岩形成于华南中生代构造体制转换的关键时期,为华南晚中生代构造背景的研究提供了重要地质依据。 相似文献
6.
博格达弧后盆地大面积分布火山碎屑岩及正常沉积碎屑岩,具有寻找浅成低温热液脉型及火山热液型矿床的找矿潜力。哈尔里克古生代复合岛弧带岩浆活动频繁,构造作用复杂,呈多期叠加现象,具有寻找斑岩型成矿系统及韧性剪切带型矿产的找矿潜力。大南湖岛弧带形成于早古生代,主要为奥陶—志留系火山-沉积岩系,发育一套具有VMS型、浅成低温热液型以及斑岩型矿床的成矿系统,具有形成铜金多金属矿产的巨大潜力。综合分析认为,博格达-哈尔里克构造带地质作用复杂,岩浆活动多期叠加,成矿地质条件有利,具有巨大的铜、金成矿潜力。 相似文献
7.
福建紫金山矿田火成岩系列与浅成低温热液—斑岩铜金银成矿系统 总被引：11，自引：1，他引：10
紫金山矿田内, 自地表往深部, 发育早白垩世中酸性火山岩、次火山英安斑岩、浅成相花岗闪长斑岩、中深成相花岗闪长岩, 构成中酸性火山-侵入岩系列。围绕着紫金山火山机构发育强烈的蚀变矿化, 形成高硫型浅成低温热液铜金矿、低硫型浅成低温热液银金矿和斑岩型铜(钼)矿床。矿田内各类铜金银矿床存在着密切的时空及物源联系, 它们在时间、空间上连续演化, 都是同源含矿中酸性岩浆在同一成矿背景之下于不同演化阶段的产物。含矿热液的物化性质及时空迁移决定了它们在不同地质部位产出不同的矿床类型, 构成与中酸性次火山-斑岩有关的浅成低温-斑岩铜金银矿成矿系统。 相似文献
8.
9.
宋文霞 《沉积与特提斯地质》2002,22(3):95-99
拨茅山—牛头山铜矿床的的赋矿岩石为中生代的火成岩系。侵入岩一潜火山岩一火山岩构成完整的侵入—喷发系列。该矿床可分为火山气液—沉积铜矿床和斑岩型铜矿床两种类型。在成矿前期，陆相火山岩在湖底发生火山喷气、火山热泉以及火山热水沉积。潜火山岩的侵入，伴有长期热液循环活动，在张性断裂为主的赋矿空间生成与斑岩有关的各类型矿床。 相似文献
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11.
13.
西秦岭降扎地区寒武、志留系中的金、铀矿床,是我国相当重要的碳硅泥岩型矿床。根据金矿床中岩石和矿石异常铅模式年龄、氩-氩同位素年龄和钾-氩同位素年龄等,获得了一批有益的年代学信息。金矿床的各种同位素年龄数据主要有2组:(1)242-186Ma;(2)137-47Ma.结合区域地质发展史、成矿热液脉与岩脉的穿切关系以及矿床产出的其它宏观特征等,确定金矿床的成矿时代为137-47Ma,与区域铀矿床形成的主要时代(117-55Ma)相比,二者成矿时间大体相同。 相似文献
14.
I. V. Chernyshev A. V. Chugaev N. S. Bortnikov G. N. Gamyanin A. V. Prokopiev 《Geology of Ore Deposits》2018,60(5):398-417
The paper considers the results of high-precision Pb–Pb isotopic analysis of 120 galena samples from 27 Au and Ag deposits of the South Verkhoyansk Synclinorium (SVS) including large Nezhdaninsky deposit (628.8 t Au). The Pb isotopic composition is analyzed on a MC-ICP-MS NEPTUNE mass-spectrometer from solutions with an error of no more than ±0.02% (2σ). Four types of deposits are studied: (i) stratified vein gold–quartz deposits (type 1) hosted in metamorphosed Upper Carboniferous–Lower Permian terrigenous rocks and formed during accretion of the Okhotsk Block to the North Asian Craton synchronously with dislocation metamorphism and related granitic magmatism; (ii) vein gold–quartz (Nezhdaninsky type) deposits also hosted in Lower Permian metasedimentary rocks; (iii) Au–Bi deposits localized at the contact zones of the Late Cretaceous granitic plutons; and (iv) Sn–Ag polymetallic deposits related to granitic and subvolcanic rocks of the Okhotsk Zone of the SVS. The deposits of types 2, 3, and 4 are postaccretionary. The general range of 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios is 18.1516–18.5903 (2.4%), 15.5175–15.6155 (0.63%), and 38.3010–39.0481 (2.0%), respectively. In 206Pb/204Pb–207Pb/204Pb and 206Pb/204Pb–208Pb/204Pb diagrams, the data points of Pb isotopic compositions of all deposits occupy restricted, partly overlapping areas along a general elongated trend. The various SVS Au–Ag deposits can be classified according to the Pb isotopic composition in accordance with all three Pb ratios. Deposits of the same type show distinct Pb isotopic compositions that strongly exceed the scale of analytical error (±0.02%). The differences in Pb isotopic composition within specific deposits are low and subordinate and have little effect on variations in the Pb isotopic composition of the SVS deposits. The μ2 values (Stacey–Kramers model), which characterize the 238U/204Pb ratios of ore lead sources of the SVS deposits, widely vary from 9.7 to 9.38. The ω2 values (232Th/204Pb) are 39.82–36.61, whereas the Th/U ratios are 4.04–3.86. The content of all three radiogenic Pb isotopes and μ2 values of feldspars from SVS intrusive rocks are strongly distinct from those of galena of stratified gold–quartz and vein gold–quartz deposits and are identical to Pb of galena from Au–Bi and Sn–Ag polymetallic deposits, indicating a mostly magmatic origin for the Pb of these deposits. Detailed isotopic study of the Nezhdaninsky deposit shows different Pb isotopic composition of two consecutive mineral assemblages (gold–sulfide and Ag polymetallic): ~0.30, ~0.07, and ~0.22% for 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios, respectively. These differences are interpreted as a result of involvement of at least two metal sources during the evolution of an ore-forming system: (i) host Lower Permian terrigenous rocks and (ii) a magmatic source similar in Pb isotopic composition to that of Sn–Ag polymetallic deposits. The Pb isotopic composition and μ2 and Th/U values show that lead of stratified gold–quartz deposits combines isotopic tracers of lower and upper crustal sources (Upper Carboniferous–Lower Permian terrigenous rocks), lead of which was mobilized by ore-bearing fluids. The high 208Pb/206Pb ratios and Th/U evolutionary parameter are common to all Pb isotopic composition of all studied Au–Ag deposits and SVS Cretaceous intrusive rocks and indicate that Pb sources were depleted in U relative to Th. Taking into account the structure of the region and conceptions on its evolution, we can suggest that the magma source was related to lower crustal subducted rocks of the Archean (~2.6 Ga) North Asian Craton and the Okhotsk terrane. 相似文献
15.
Sedex型矿床成矿系统 总被引：53，自引：0，他引：53
系统总结了Ｓｅｄｅｘ型矿床产出的构造背景、地质环境、矿床地质地球化学特征、矿化流体来源及成矿模式等问题。结合某些最新研究成果,对该类型矿床的Ｐｂ、Ｓｉ、Ｂ同位素地球化学进行了综合研究,并以加拿大科迪勒拉地区页岩容矿的Ｚｎ Ｐｂ矿床、中国大厂锡多金属矿床及澳大利亚布罗肯希尔Ｐｂ Ｚｎ Ａｇ矿床为例,深入讨论了Ｐｂ、Ｓｉ、Ｂ的来源及其对矿床成因的指示意义。对产于不同地质环境下现代海底热液成矿系统的研究证明,有沉积物覆盖和无沉积物覆盖海底成矿热流体的化学组成及Ｐｂ、Ｓｒ、Ｂ稳定同位素地球化学明显不同。前者富含与陆壳物质有关的金属组合及ＮＨ４,并富含放射成因Ｐｂ和Ｓｒ的组分,后者富含与洋壳玄武岩有关的金属组合,但特别贫ＮＨ４。这种不同与古代Ｓｅｄｅｘ型和塞浦路斯型矿床之间化学组成的差别十分相似,它意味着前者成矿物质主要来源于下伏陆壳岩石,并为其富含Ｂ,Ｂａ,Ａｇ,Ａｓ,Ｓｂ,Ｗ,Ｓｎ,Ｈｇ,Ｍｎ等元素提供了合理的解释。在此基础上,笔者指出,在特定地球化学背景下,上述那些元素也能形成独立的Ｓｅｄｅｘ型矿床,同时强调了注意寻找这种新型矿床的重要性 相似文献
16.
FU Zhongyang XU Xiaochun HE Jun FAN Ziliang XIE Qiaoqin DU Jianguo CHEN Fang 《《地质学报》英文版》2019,93(1):88-110
The Tongling ore district is one of the most economically important ore areas in the Middle–Lower Yangtze River Metallogenic Belt, eastern China. It contains hundreds of polymetallic copper–gold deposits and occurrences. Those deposits are mainly clustered(from west to east) within the Tongguanshan, Shizishan, Xinqiao, Fenghuangshan, and Shatanjiao orefields. Until recently, the majority of these deposits were thought to be skarn-or porphyry–skarn-type deposits; however there have been recent discoveries of numerous vein-type Au, Ag, and Pb-Zn deposits that do not fall into either of these categories. This indicates that there is some uncertainty over this classification. Here, we present the results of several systematic geological studies of representative deposits in the Tongling ore district. From investigation of the ore-controlling structures, lithology of the host rock, mineral assemblages, and the characteristics of the mineralization and alteration within these deposits, three genetic types of deposits(skarn-, porphyry-, and vein-type deposits) have been identified. The spatial and temporal relationships between the orebodies and Yanshanian intrusions combined with the sources of the ore-forming fluids and metals, as well as the geodynamic setting of this ore district, indicate that all three deposit types are genetically related each other and constitute a magmatic–hydrothermal system. This study outlines a model that relates the polymetallic copper–gold porphyry-, skarn-, and vein-type deposits within the Tongling ore district. This model provides a theoretical basis to guide exploration for deep-seated and concealed porphyry-type Cu(–Mo, –Au) deposits as well as shallow vein-type Au, Ag, and Pb–Zn deposits in this area and elsewhere. 相似文献
17.
沉积（火山）岩中铅锌矿化与金矿化的关系——兼论我国铅锌矿化集中区的金矿勘查 总被引：1，自引：0，他引：1
近年来,我国在铅锌矿区或外围发现了越来越多不同类型的金矿床,铅锌矿化与金矿化之间的相互关系及其勘查指示意义已引起了广泛的关注。沉积（火山）岩中的铅锌矿化基本可分三种类型,不同类型的铅锌矿化有不同的成矿环境,而金的成矿地质事件是在特定地区与特定的热—构造事件相互耦合的。研究发现,只有在经历了后期强烈的热—构造事件的Sedex型或VMS型铅锌矿区才具备形成金矿化的条件,是金矿勘查的有利地区;MVT型和后期缺乏热—构造事件的Sedex型或VMS型铅锌矿区不具备形成金矿化的条件,是金矿勘查的不利地区。 相似文献
18.
论华南喷流—沉积块状硫化物矿床 总被引：28，自引：1，他引：27
现代海底喷流－沉积硫化物矿床的发现极大地推动了海底热液成矿理论的发展,也大大地提高了对古代海底喷流块充化物矿术的研究水平。本文指出喷流－沉积是重要的成矿作用,提出喷流－沉积矿床是华南Ｃｕ、Ｐｂ、Ｚｎ、Ｓｎ、Ａｇ、Ａｕ等矿产资源的重要来源,形成了一批超大型矿床,并将华南许多曾被认为属夕卡岩矿床重新确认为喷流－沉积岩床。文章还论述了华南喷流－沉积块状硫化物矿床的特征、分类、时空分布及其成矿特点等问题,提出断裂拗陷带型喷流－沉积块状硫化物矿床是华南具有特色的类型,而陆相断陷盆地中喷流－沉积矿床值得进一步深入研究。 相似文献
19.
J. S. Stuckless J. A. Bunting I. T. Nkomo 《Australian Journal of Earth Sciences》2013,60(3-4):365-375
The Mount Boreas‐type granite and spatially associated syenitic granitoid of Western Australia yield Pb‐Pb ages of 2370 ± 100 Ma and 2760 ± 210 Ma, respectively. Th‐Pb ages, although less precise, are concordant with these ages, and therefore the apparent ages are interpreted to be the crystallisation ages for these two units. U‐Pb ages are variable and for the most part anomalously old, which suggests a Cainozoic uranium loss. However, this loss is generally small (< 3μg/g); therefore, neither granitoid in its fresh state provides a good source for nearby calcrete‐hosted uranium deposits. The possibility remains that the Mount Boreas‐type granite that has been completely weathered during the Tertiary could have been a source for the calcrete‐type uranium deposits in W.A. Although the Mount Boreas‐type granite is highly fractionated, it does not bear a strong geochemical imprint of a sedimentary precursor. This feature contrasts it with apparently fresh granitoids from other parts of the world that have lost large amounts of uranium (～ 20μg/g) and are associated with large roll‐type and other low temperature‐type uranium deposits. 相似文献
20.
John S. Stacey Bruce R. Doe Ralph J. Roberts Maryse H. Delevaux John W. Gramlich 《Contributions to Mineralogy and Petrology》1980,74(2):175-188
New lead isotope data are presented for some late Precambrian and early Paleozoic vein and massive sulfide deposits in the Arabian Shield. Using the Stacey Kramers (1975) model for lead isotope evolution, isochron model ages range between 720 m.y. and 420 m.y. Most of the massive sulfide deposits in the region formed before 680 m.y. ago, during evolution of the shield. Vein type mineralization of higher lead content occurred during the Pan African event about 550 m.y. ago and continued through the Najd period of extensive faulting in the shield that ended about 530 m.y. ago. Late post-tectonic metamorphism may have been responsible for vein deposits that have model ages less than 500 m.y. Alternatively some of these younger model ages may be too low due to the mineralizing fluids acquiring radiogenic lead from appreciably older local crustal rocks at the time of ore formation.The low207Pb/204Pb ratios found for the deposits in the main part of the shield and for those in north-eastern Egypt, indicate that the Arabian craton was formed in an oceanic crustal environment during the late Precambrian. Involvement of older, upper-crustal material in the formation of the ore deposits in this part of the shield is precluded by their low207Pb/204Pb and208Pb/204Pb characteristics.In the eastern part of the shield, east of longitude 44°20E towards the Al Amar-Idsas fault region, lead data are quite different. They exhibit a linear207Pb/204Pb-206Pb/204Pb relationship together with distinctly higher208Pb/204Pb characteristics. These data imply the existence of lower crustal rocks of early Proterozoic age that apparently have underthrust the shield rocks from the east. If most of the samples we have analyzed from this easterly region were mineralized 530 m.y. ago, then the age of the older continental rocks is 2,100±300 m.y. (2).The presence of upper crustal rocks, possibly also of early Proterozoic age, is indicated by galena data from Hailan in South Yemen and also from near Muscat in Oman. These data are the first to indicate such old continental material in these regions. 相似文献