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Petrogenesis of skarn in Shizhuyuan W-polymetallic deposit, southern Hunan,China:Constraints from petrology,mineralogy and geochemistry

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Transactions of Nonferrous Metals Society of China 2016年第6期26卷 1676-1687页

作者：成永生中南大学有色金属成矿预测与地质环境监测教育部重点实验室长沙410083 中南大学地球科学与信息物理学院长沙410083 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550002

Skarn is the main altered rock type and is of great importance to mineralization and ore-prospecting in the Shizhuyuan area of Hunan province, China. Its features of petrography, mineralogy and geochemistry were studied systematically. The results show that the skarn mainly consists of garnet skarn, secondary wollastonite-garnet skarn, tremolite-clinozoisite skarn, and few wolframine garnet skarn, idocrase-garnet skarn and wollastonite skarn with granoblastic texture, granular sheet crystalloblastic texture, and massive structure, disseminated structure, mesh-vein structure, comb structure, and banded structure. And, it is mainly composed of garnet, fluorite, chlorite, hornblende, epidote, tremolite, plagioclase, biotite, muscovite, plagioclase, quartz, idocrase, and calcite and so on. The chemical components mainly include SiO2, Al2O3, Fe2O3, MgO and CaO, and the trace elements and REEs consist of Li, Be, V, Co, Zn, Ga, Rb, Sr, Y, Ce, Nd, Pb and Bi, etc. And, the obvious fractionation exists between LREE and HREE, and it shows typical features of Nanling ore-forming granite for W？Sn polymetallic deposit. Skarn is derived from the sedimentary rock, such as limestone, mudstone, argillaceous rock, and few pelitic strips. It is affected by both Shetianqiao formation strata and Qianlishan granite during the diagenesis, indicating a strong reduction environment. The occurrence of skarn, whose mutation site is favorable to the mineralization enrichment, is closely related to the mineralization and prospecting.

关键词： skarn petrogenesis geochemistry Shizhuyuan W-polymetallic deposit southern Hunan

Fluid inclusion and mineralization of Dafulou tin deposit in Dachang metal district, Guangxi, south China

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Transactions of Nonferrous Metals Society of China 2013年第9期23卷 2726-2735页

作者：成永生中南大学有色金属成矿预测教育部重点实验室长沙410083 中南大学地球科学与信息物理学院长沙410083 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550002

Based on the study of the petrology, mineralogy, structural geology and fluid inclusion of the Dafulou ore deposit in the Dachang ore field, the ore deposit geology and ore-forming fluids were analyzed. It shows that there are five main hydrothermal alteration types in the Dafulou ore district, namely the silicification, carbonate, sericite, pyrite and pyrrhotite. The mineralization types are composed of the stratiform type, interlayer type and stockwork type. The ore textures present as metasomatic texture, euhedral-subhedral granular texture and solid solution texture. The ore structure consists of massive structure, dissemination structure, fine veined structure, stockwork structure and brecciated structure. Four ore types are recognized, namely the disseminated ore, dense massive ore, veinlet ore and brecciated ore. Six types of fluid inclusions are determined, i.e. the single-phase gaseous fluid inclusions, single-phase salt solution fluid inclusions, two-phase vapour-rich fluid inclusions, two-phase liquid-rich fluid inclusions, three-phase CO2-rich fluid inclusions and solid（s）-bearing fluid inclusions, all of which form in three dominant temperature scopes, 120-150, 230-270, 350-460 °C. But, the majority of them form in the high temperature environment （350-460 °C）. The tectonism plays an important role in the mineralization, which usually controls the scale, occurrence and shape of the Sn orebody. There are four types of hydrothermal fluid systems, H2O-NaCl-CaCl2, H2O-CaCl2, H2O-NaCl-MgCl2 and H2O-MgCl2. Similar to the other ore deposits in the Dachang ore field, there also exists the multiple source of ore-forming fluids. Overall, the Dafulou ore deposit should be the result of the crust-mantle interaction.

关键词： fluid inclusion mineralization Sn-polymetallic deposit Dafulou Dachang

Geological features and S isotope composition of tin deposit in Dachang ore district in Guangxi

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Transactions of Nonferrous Metals Society of China 2014年第9期24卷 2938-2945页

The geological investigation of the Dachang ore field was carried out in detail, and the geological characteristics of the deposits, consisting of the Tongkeng and Dafulou deposits, were observed and researched systematically. It suggests that the mineralization types of Changpo ore are composed of cracking vein, thin vein, bedded vein and thin vein-net vein disseminated types. The cracking vein ore is usually lens-shaped in the vertical direction. The thin vein ore is always characterized by a stable trend and tendency. The bedded ore always occurs along the strata in the way of filling and metasomatism in the fracture system. In terms of Bali-longtoushan ore, it is characterized by complicated mineral components and a variety of minerals. More generally, ore textures consist of the anhedral-subhedral shapes and thin particle, and secondary with the interstitial texture, solid solution separation texture, dissolution texture, corona texture, and crushing texture, yet ore structures include the massive, veinlet, disseminated, banded, miarolitic, biological residual and brecciated structure. In addition, the sulfur isotopes of the metal sulfide were analyzed. The results show that the δ34S values of Tongkeng ore range from-0.30% to 1.38% with more dispersed characteristics, yet in terms of Dafulou ore, the δ34S values are from-0.15% to 0.22% which are characterized by more focused. This indicates that the sulfur isotope composition has large difference between the different deposits. The sulfur isotope values of the Dafulou ore are concentrated relatively, yet are dispersed for the Tongkeng ore. Likewise, there are also divergences of sulfur isotopes for the different minerals. The sulfur isotope values of pyrrhotine are dispersed, yet are homogeneous for pyrite. In short, the divergence of the sulfur isotope is reflected in both the different deposits and minerals, all of these may account for the difference of sulfur sources.

关键词： deposit geology sulfur isotope sulfur sources Dachang tin deposit

Ore-forming material of Dachang tin deposit in Guangxi, China:Lead isotope evidence

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Transactions of Nonferrous Metals Society of China 2014年第11期24卷 3652-3659页

作者：成永生彭程中南大学有色金属成矿预测教育部重点实验室长沙410083 中南大学地球科学与信息物理学院长沙410083 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550002

For revealing the ore sources of the Dachang tin?polymetallic ore deposit, the lead isotopes were analyzed systematically by using the single minerals of sulphides, including pyrite, pyrrhotite, sphalerite, and galena. Then, the mineral sources and their characteristics were discussed based on the classical lead isotope discriminating model. The results show that the lead isotope ratios of206Pb/204Pb,207Pb/204Pb, and208Pb/204Pb range from 17.478 to 18.638, 15.440 to 15.858, and 37.556 to 39.501, respectively. According to Zartman lead model, the ore lead contains the upper crust composition; however, the granite does not provide all ore leads, and other material sources exist. Obviously, the ore deposit belongs to the result of the combined effect of crust?mantle. The source rocks are characterized by a certain degree of similarity with the island arc material. Moreover, its distant origin in the upper and lower crusts may be related to the subduction island arc material or oceanic crust. The mantle-derived material may have a certain status in the source region. Meanwhile, based on the lead isotope three-dimensional topology projection vectors, the ore leads are concentrated in zoneA, which indicates the characteristics of Yangtze lead isotope province and a possible genetic relationship with Yangtze block.

关键词： lead isotope ore source ore genesis Dachang tin-polymetallic deposit Guangxi

Geochemistry of intrusive rock in Dachang tin-polymetallic ore field, Guangxi, China: Implications for petrogenesis and geodynamics

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Transactions of Nonferrous Metals Society of China 2015年第1期25卷 284-292页

The major element, trace element and rare earth element（REE） of the intrusion rock from the Dachang ore field in Guangxi, China, were analyzed. The results show that the phenocryst（about 15%） and matrix（about 85%） mainly consist of quartz, K-feldspar and plagioclase. The rock is composed of low content of Si and high content of Al2O3, low contents of Ca, Fe2O3, Na, TiO2, etc. The intrusion rock has the medium alkali content, attributing to K-rich type rock; and contains medium to low REE contents, of which light rare earth elements（LREEs） and heavy rare earth elements（HREEs） are highly fractionated, showing a weak negative Ce anomaly and a negative Eu anomaly. These rocks are enriched in LREE, and the large ion lithophytes elements（LILE） are rich in Rb, Sr, and U; the high-field-strength elements（Nb, Th, etc） are relatively depleted. The REE chondrite-normalized patterns are consistent with the overall, roughly indicating their similar characteristics, sources and evolution. The intrusion rock mainly formed during the collisional and within-plate periods.

关键词： geochemistry petrogenesis tectonic setting magma evolution Dachang ore field Guangxi

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九万大山地区断裂构造分形特征及其地质意义

中国地质 2010年第1期37卷 127-133页

作者：成永生中南大学信息物理工程学院湖南长沙410083 广西华锡集团股份有限公司广西柳州545006 中南大学资源与安全工程学院湖南长沙410083

本文借助于陆地卫星多波段卫星遥感影像,对九万大山区断裂构造进行了综合解译,结合区域地质背景,基于分形几何学的理论基础,对遥感解译断裂构造进行了定量化研究。结果显示,九万大山区断裂构造的分维值较高,显示断裂带结构复杂、构造活... 详细信息

本文借助于陆地卫星多波段卫星遥感影像,对九万大山区断裂构造进行了综合解译,结合区域地质背景,基于分形几何学的理论基础,对遥感解译断裂构造进行了定量化研究。结果显示,九万大山区断裂构造的分维值较高,显示断裂带结构复杂、构造活动强烈;元宝山子区断裂构造分维值明显偏低,其中北东向断裂构造的分维值大于北西向断裂构造的分维值,说明区内以北东向断裂构造为主,属主导性断裂构造,这恰好与区域构造特征相吻合。

关键词：分形断裂地质解译遥感九万大山

广西大厂矿田泥盆系地层地球化学及其成矿指示

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中国有色金属学报 2013年第9期23卷 2649-2658页

作者：成永生黄惠明中南大学有色金属成矿预测教育部重点实验室长沙410083 中南大学地球科学与信息物理学院长沙410083 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550002 广西二一五地质队有限公司柳州545006

利用岩石地球化学的理论与方法，对大厂矿田的主要赋矿地层泥盆系中、上统开展了主量元素地球化学、稀土元素地球化学以及微量元素地球化学的分析与研究，对泥盆系地层与大厂矿田矿床与矿产的关系进行了探讨，阐述了泥盆系的有利成矿条... 详细信息

利用岩石地球化学的理论与方法，对大厂矿田的主要赋矿地层泥盆系中、上统开展了主量元素地球化学、稀土元素地球化学以及微量元素地球化学的分析与研究，对泥盆系地层与大厂矿田矿床与矿产的关系进行了探讨，阐述了泥盆系的有利成矿条件及其对矿床的关键控制作用。结果表明，泥盆系地层主量元素成分为SiO2、CaO、Al203、Fe2O3、MgO、Na2O以及K2O等，以SiO2和CaO为主体，其中，纳标组地层CaO含量最高，其余各组地层SiO2含量均表现为不同程度的偏高，这与大厂矿区泥盆系地层的岩性特征以及岩石组合密切相关。利用A1203-SiO2岩石热水成因模式显示，泥盆系形成过程中沉积环境多变，岩石物源具有多来源的特点，也从一定程度上导致了泥盆系地层多样化的岩性特点以及复杂的岩石建造。泥盆系ЕREE含量变化于（2．9～318．77）×10咱之间，其中，纳标组地层表现出轻、重稀土元素亏损，罗富组地层则表现为轻、重稀土元素富集。泥盆系地层的微量元素组成主要包括Ba、Rb、Sr、Th、U、La、Ce、Pr、Nd等。泥盆系不同组地层独特的岩石类型与岩性组合，是金属成矿元素发生富集的有利因素。

关键词：大厂泥盆系地球化学控矿因素成矿作用

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广西大福楼锡多金属矿床成矿流体特征

中南大学学报（自然科学版） 2012年第10期43卷 3924-3930页

作者：成永生胡瑞忠中南大学地球科学与信息物理学院、有色金属成矿预测教育部重点实验室湖南长沙410083 中国科学院地球化学研究所矿床地球化学国家重点实验室贵州贵阳550002

通过流体包裹体岩相学和显微测温学等分析，研究大福楼矿床成矿流体的性质及其演化。研究结果表明：大福楼锡矿共发育6种类型的流体包裹体，即I型（单相气相包裹体）、Ⅱ型（单相盐水溶液包裹体）、Ⅲ型（两相富蒸汽包裹体）、Ⅳ型（两... 详细信息

通过流体包裹体岩相学和显微测温学等分析，研究大福楼矿床成矿流体的性质及其演化。研究结果表明：大福楼锡矿共发育6种类型的流体包裹体，即I型（单相气相包裹体）、Ⅱ型（单相盐水溶液包裹体）、Ⅲ型（两相富蒸汽包裹体）、Ⅳ型（两相富液体包裹体）、V型（含C02相包裹体）以及Ⅵ型（含NaCl子矿物包裹体）。流体包裹体的均一温度为120～430℃，主要的成矿温度为120～145℃和380～430℃。流体包裹体盐度变化不大，介于17．00％～22．00％之间，属于高盐度流体，具有岩浆热液的标志；流体密度为0．158～1．105g／cm。，压力为12．0～65．0MPa，属于中高压力的成矿流体。大福楼锡多金属矿床的成矿流体与大厂矿田其他矿床具有很好的一致性，表明其可能相似的来源与演化。

关键词：大福楼锡多金属矿床成矿流体包裹体广西

广西大福楼矿床铅同位素组成及其对矿床成因的约束(英文)

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中国有色金属学会会刊：英文版 2013年第6期23卷 1766-1773页

作者：成永生胡瑞忠中南大学有色金属成矿预测教育部重点实验室长沙410083 中南大学地球科学与信息物理学院长沙410083 中国科学院地球化学研究所矿床地球化学国家重点实验室贵阳550002

利用大福楼矿床新开采坑道的矿石样品进行铅同位素分析,探讨了矿床的成矿物质来源及其构造背景。结果表明,206Pb/204Pb、207Pb/204Pb以及208Pb/204Pb分别位于17.478～18.431、15.440～15.717以及37.556～38.839,Φ值位于0.592～0.638,... 详细信息

利用大福楼矿床新开采坑道的矿石样品进行铅同位素分析,探讨了矿床的成矿物质来源及其构造背景。结果表明,206Pb/204Pb、207Pb/204Pb以及208Pb/204Pb分别位于17.478～18.431、15.440～15.717以及37.556～38.839,Φ值位于0.592～0.638,μ值为9.26～9.69,Th/U取值范围为3.74～3.97。比较大厂矿田不同矿带的铅同位素组成的结果表明,西矿带的铅源可能更加单一,中矿带的铅同位素值相对最大,而东矿带的铅同位素值则最小;大厂矿集区的铅源主要由上地壳铅、壳幔混合俯冲带铅以及造山带铅所组成。根据铅同位素构造判别图,矿石铅主要来自于地幔和地壳,尤其是上地壳以及岩浆活动在成矿作用过程中发挥了重要作用。然而,造山作用也提供了少量铅源,矿床应该属于壳幔联合作用的产物,更可能形成于造山带成矿环境中。

关键词：铅同位素矿源构造背景大福楼大厂矿田