地学前缘 ›› 2021, Vol. 28 ›› Issue (3): 338-354.DOI: 10.13745/j.esf.sf.2021.1.25
卢宜冠1(), 涂家润1, 孙凯1, 覃鹏2, 王华青3, 何胜飞1, 张航1, 龚鹏辉1, 郭硕1, 方科2, 和文言4,*(
)
收稿日期:
2021-01-05
修回日期:
2021-03-03
出版日期:
2021-05-20
发布日期:
2021-05-23
通信作者:
和文言
作者简介:
卢宜冠(1990—),男,博士,高级工程师,主要从事矿产勘查与矿床学研究工作。E-mail: luyiguan@mail.cgs.gov.cn
基金资助:
LU Yiguan1(), TU Jiarun1, SUN Kai1, QIN Peng2, WANG Huaqing3, HE Shengfei1, ZHANG Hang1, GONG Penghui1, GUO Shuo1, FANG Ke2, HE Wenyan4,*(
)
Received:
2021-01-05
Revised:
2021-03-03
Online:
2021-05-20
Published:
2021-05-23
Contact:
HE Wenyan
摘要:
谦比希铜钴矿床是中非赞比亚成矿带重要的超大型铜钴矿床之一,由主矿体、西矿体和东南矿体3部分组成,赋矿层位主要为下罗安亚群敏多拉组和基特韦组,岩性包括泥质板岩、泥质石英岩、板岩、石英砂岩等。现有资料对于矿床中钴的赋存状态和含钴矿物成因的研究较为薄弱,这也直接制约了对钴矿的成因认识及今后找矿方向。本次研究聚焦谦比希矿床中的富钴矿物,对该类矿物进行电子探针、微区X射线荧光光谱分析和S同位素研究,通过查明谦比希矿床中钴的赋存状态及成因机制,为今后区域上钴资源的找矿勘查提供理论依据。分析结果表明谦比希矿床中钴以独立矿物和类质同象形式存在,其中独立矿物主要为硫铜钴矿和硫钴矿。在热液黄铁矿(Py2)和磁黄铁矿中,钴含量最高分别可达4.9%和1.5%,Co与Fe含量成反比关系且Co富集区域较为均匀地分布在硫化物中,说明Co取代Fe以类质同象方式赋存于黄铁矿和磁黄铁矿中。此外,谦比希矿床热液期黄铁矿-磁黄铁矿的Co-Ni范围不同于夕卡岩型及其他几种成矿类型的黄铁矿和磁黄铁矿,结合前人对热液矿化期流体包裹体的H-O同位素研究,暗示富钴的成矿流体可能并非岩浆热液流体,而是中-高温的变质热液流体。西矿体斑铜矿和东南矿体磁黄铁矿δ34S值分别为6‰~6.9‰和7.2‰~12.6‰,表明热化学硫酸盐还原作用是谦比希矿床还原性硫形成的主要机制,硫化物在经历了变质作用后δ34S值具有均一化。综合本文和前人已有研究,我们认为钴的主成矿期与卢菲利安造山作用密切相关,造山期中-高温变质热液使得钴、铜等金属元素再富集。NE-SW向挤压形成的褶皱枢纽及特定走向断层的交汇处等构造发育部位可以作为钴矿体的有利找矿地段,而热液脉中的黄铁矿-磁黄铁矿组合可作为区域上寻找钴矿体的矿物标志。
中图分类号:
卢宜冠, 涂家润, 孙凯, 覃鹏, 王华青, 何胜飞, 张航, 龚鹏辉, 郭硕, 方科, 和文言. 中非赞比亚成矿带谦比希铜钴矿床钴的赋存状态与成矿规律[J]. 地学前缘, 2021, 28(3): 338-354.
LU Yiguan, TU Jiarun, SUN Kai, QIN Peng, WANG Huaqing, HE Shengfei, ZHANG Hang, GONG Penghui, GUO Shuo, FANG Ke, HE Wenyan. Cobalt occurrence and ore-forming process in the Chambishi deposit in the Zambian Copperbelt, Central Africa[J]. Earth Science Frontiers, 2021, 28(3): 338-354.
图2 赞比亚成矿带地层柱状图及典型矿床赋矿层位示意图(据文献[15,17]修改)
Fig.2 Schematic lithostratigraphic column of the Zambian Copperbelt, showing the features of typical deposit layers. Modified after [15,17].
图5 谦比希铜钴矿矿石手标本照片 a—西矿体矿石中浸染状斑铜矿、黄铜矿;b—东南矿体同沉积期矿石中星点状黄铜矿和黄铁矿(Py1);c—东南矿体矿石中团块状黄铜矿和自形磁黄铁矿;d—东南矿体矿石中发育磁黄铁矿-热液黄铁矿(Py2)-黄铜矿-石英-方解石脉。Ccp—黄铜矿;Bn—斑铜矿;Py—黄铁矿;Po—磁黄铁矿;Qz—石英;Cal—方解石。
Fig.5 Photos of Cu-Co ore specimen from the Chambishi deposit
图6 谦比希铜钴矿矿石镜下照片 a—西矿体斑铜矿中的黄铜矿细脉呈九十度夹角;b—西矿体中黄铜矿交代斑铜矿;c—西矿体斑铜矿中自形硫铜钴矿;d—西矿体中它形硫铜钴矿交代斑铜矿;e—东南矿体中同沉积期浸染状黄铜矿;f—东南矿体同沉积期星点状黄铜矿与黄铁矿(Py1);g—东南矿体热液脉中共生的磁黄铁矿、黄铜矿和黄铁矿(Py2);h—东南矿体自形硫钴矿与磁黄铁矿、黄铜矿共生;i—东南矿体硫化物热液脉中硫铜钴矿以自形-半自形分布在磁黄铁矿的边部。Ccp—黄铜矿;Bn—斑铜矿;Car—硫铜钴矿;Py—黄铁矿;Po—磁黄铁矿;Lnt—硫钴矿;Qz—石英;Ser—绢云母;Cal—方解石。
Fig.6 Microphotographs of Cu-Co ores from the Chambishi deposit
编号 | 矿体名称 | 矿石构造 | 矿物名称 | wB/% | ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
As | Se | Au | Mo | S | Ag | Sn | Sb | Te | Mn | Fe | Co | Ni | Cu | Zn | Total | |||||||||||||||||||
QBXDN-1-2-4 | 谦比希东南 | 层状/脉状 | 黄铜矿 | 0.292 | - | - | 0.317 | 33.557 | 0.002 | - | 0.009 | - | - | 30.44 | 0.044 | 0.007 | 34.324 | - | 98.992 | |||||||||||||||
QBXDN-1-2-6 | 谦比希东南 | 层状/脉状 | 黄铜矿 | 0.315 | - | - | 0.294 | 33.73 | - | - | 0.004 | - | - | 30.405 | 0.036 | - | 34.576 | 0.026 | 99.386 | |||||||||||||||
QBXDN-4-1-2 | 谦比希东南 | 团块状 | 黄铜矿 | 0.243 | 0.009 | 0.02 | 0.296 | 32.893 | 0.003 | - | 0.01 | 0.004 | - | 29.193 | 0.044 | - | 32.557 | 0.166 | 95.438 | |||||||||||||||
QBXDN-4-1-4 | 谦比希东南 | 团块状 | 黄铜矿 | 0.323 | 0.007 | 0.003 | 0.34 | 34.787 | - | 0.001 | 0.002 | 0.029 | 0.001 | 30.841 | 0.045 | 0.009 | 33.788 | 0.127 | 100.303 | |||||||||||||||
QBXDN-5-3-9 | 谦比希东南 | 脉状 | 黄铜矿 | 0.304 | 0.011 | 0.06 | 0.301 | 35.2 | 0.005 | - | 0.005 | - | - | 30.038 | 0.029 | - | 32.643 | 0.04 | 98.636 | |||||||||||||||
QBXDN-18-1-0 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.277 | - | - | 0.355 | 34.876 | 0.008 | - | - | 0.003 | - | 30.241 | 0.035 | 0.016 | 33.98 | 0.047 | 99.838 | |||||||||||||||
QBXDN-18-2-3 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.298 | - | 0.029 | 0.363 | 35.546 | - | - | - | 0.01 | - | 30.628 | 0.022 | - | 34.602 | 0.037 | 101.535 | |||||||||||||||
QBXDN-18-2-6 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.284 | - | - | 0.373 | 35.46 | - | - | - | - | 0.001 | 30.58 | 0.031 | - | 34.646 | 0.101 | 101.476 | |||||||||||||||
QBXDN-19-1-1 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.311 | 0.018 | - | 0.276 | 33.726 | - | - | 0.001 | - | 0.01 | 30.198 | 0.061 | 0.001 | 32.871 | 0.09 | 97.563 | |||||||||||||||
QBXDN-19-2-5 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.311 | - | - | 0.308 | 33.458 | 0.016 | - | 0.004 | - | - | 30.243 | 0.054 | 0.014 | 33.498 | 0.055 | 97.961 | |||||||||||||||
QBXX-3-2-4 | 谦比希西 | 团块状 | 黄铜矿 | 0.26 | - | 0.039 | 0.306 | 34.204 | - | 0.009 | 0.012 | 0.011 | - | 29.725 | 0.027 | - | 34.06 | 0.027 | 98.68 | |||||||||||||||
QBXX-3-2-4B | 谦比希西 | 团块状 | 黄铜矿 | 0.335 | - | 0.018 | 0.419 | 34.777 | 0.002 | - | - | 0.015 | - | 29.977 | 0.022 | - | 34.496 | 0.031 | 100.092 | |||||||||||||||
QBXX-3-2-6 | 谦比希西 | 团块状 | 黄铜矿 | 0.261 | - | - | 0.34 | 34.24 | 0.006 | - | 0.002 | 0.006 | 0.011 | 29.278 | 0.008 | - | 33.151 | - | 97.303 | |||||||||||||||
QBXX-8-1-2 | 谦比希西 | 团块状 | 黄铜矿 | 0.334 | 0.014 | 0.023 | 0.285 | 35.156 | - | - | - | - | - | 29.752 | 0.024 | - | 33.586 | 0.01 | 99.184 | |||||||||||||||
QBXX-8-2-5 | 谦比希西 | 团块状 | 黄铜矿 | 0.299 | - | 0.014 | 0.395 | 35.035 | - | - | - | 0.009 | - | 30.106 | - | - | 33.513 | 0.05 | 99.421 | |||||||||||||||
QBXX-8-3-7 | 谦比希西 | 团块状 | 黄铜矿 | 0.267 | - | 0.066 | 0.335 | 34.523 | 0.002 | - | - | 0.005 | 0.009 | 29.598 | 0.009 | - | 33.156 | 0.019 | 97.989 | |||||||||||||||
QBXX-10-2-6 | 谦比希西 | 团块状 | 黄铜矿 | 0.257 | 0.031 | 0.014 | 0.304 | 34.551 | 0.025 | - | 0.011 | - | 0.001 | 30.144 | 0.03 | - | 33.371 | 0.066 | 98.805 | |||||||||||||||
QBXX-10-3-7 | 谦比希西 | 团块状 | 黄铜矿 | 0.269 | 0.009 | - | 0.382 | 34.661 | - | - | - | - | 0.005 | 30.367 | 0.061 | - | 33.459 | 0.129 | 99.342 | |||||||||||||||
QBXX-3-1-2 | 谦比希西 | 团块状 | 斑铜矿 | 0.119 | 0.015 | - | 0.303 | 26.291 | 0.049 | - | 0.009 | 0.025 | - | 10.797 | - | - | 62.422 | 0.056 | 100.086 | |||||||||||||||
QBXX-3-2-3 | 谦比希西 | 团块状 | 斑铜矿 | 0.12 | - | - | 0.246 | 25.78 | 0.044 | 0.002 | 0.002 | - | - | 10.944 | 0.012 | - | 62.687 | 0.013 | 99.85 | |||||||||||||||
QBXX-3-2-5 | 谦比希西 | 团块状 | 斑铜矿 | 0.122 | - | 0.005 | 0.253 | 25.775 | 0.043 | - | 0.015 | - | 0.027 | 10.801 | 0.014 | - | 60.795 | 0.035 | 97.885 | |||||||||||||||
QBXX-8-1-3 | 谦比希西 | 团块状 | 斑铜矿 | 0.168 | - | - | 0.257 | 26.693 | 0.029 | - | 0.01 | 0.005 | - | 11.249 | 0.254 | - | 60.313 | 0.024 | 99.002 | |||||||||||||||
QBXX-8-2-4 | 谦比希西 | 团块状 | 斑铜矿 | 0.178 | - | - | 0.234 | 26.446 | 0.032 | - | 0.007 | - | 0.02 | 11.411 | 0.031 | - | 59.897 | 0.022 | 98.278 | |||||||||||||||
QBXX-8-3-6 | 谦比希西 | 团块状 | 斑铜矿 | 0.165 | - | - | 0.286 | 25.481 | 0.025 | - | - | 0.011 | - | 10.693 | 0.008 | - | 57.595 | 0.115 | 94.379 | |||||||||||||||
QBXX-10-1-2 | 谦比希西 | 团块状 | 斑铜矿 | 0.152 | 0.03 | - | 0.23 | 25.707 | 0.058 | 0.009 | 0.014 | 0.004 | - | 11.233 | 0.021 | - | 62.189 | 0.096 | 99.743 | |||||||||||||||
QBXX-10-2-5 | 谦比希西 | 团块状 | 斑铜矿 | 0.124 | - | 0.003 | 0.227 | 25.587 | 0.032 | - | 0.006 | 0.009 | 0.012 | 10.316 | - | - | 61.024 | 0.057 | 97.397 | |||||||||||||||
QBXX-10-3-8 | 谦比希西 | 团块状 | 斑铜矿 | 0.146 | - | 0.019 | 0.205 | 26.222 | 0.03 | - | 0.025 | - | 0.017 | 11.035 | 0.002 | - | 60.584 | 0.057 | 98.342 | |||||||||||||||
QBXDN-1-2-3 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.608 | - | - | 0.342 | 38.29 | 0.016 | 0.003 | - | 0.01 | - | 59.256 | 0.294 | - | - | 0.017 | 98.836 | |||||||||||||||
QBXDN-1-2-5 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.565 | 0.005 | 0.009 | 0.417 | 37.486 | - | - | 0.001 | 0.005 | 0.001 | 59.944 | 0.383 | - | 0.037 | - | 98.853 | |||||||||||||||
编号 | 矿体名称 | 矿石构造 | 矿物名称 | wB/% | ||||||||||||||||||||||||||||||
As | Se | Au | Mo | S | Ag | Sn | Sb | Te | Mn | Fe | Co | Ni | Cu | Zn | Total | |||||||||||||||||||
QBXDN-1-3-15 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.592 | - | - | 0.354 | 37.755 | - | - | - | 0.026 | - | 59.217 | 1.515 | 0.129 | 0.079 | 0.031 | 99.698 | |||||||||||||||
QBXDN-1-3-7 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.505 | - | 0.015 | 0.382 | 37.563 | - | - | 0.003 | 0.008 | - | 59.857 | 0.469 | 0.013 | - | 0.079 | 98.894 | |||||||||||||||
QBXDN-4-1-3 | 谦比希东南 | 团块状 | 磁黄铁矿 | 0.556 | 0.021 | 0.038 | 0.353 | 38.394 | - | - | 0.017 | 0.009 | - | 60.258 | 0.163 | - | - | 0.014 | 99.823 | |||||||||||||||
QBXDN-4-1-6 | 谦比希东南 | 团块状 | 磁黄铁矿 | 0.472 | 0.028 | - | 0.333 | 38.567 | 0.034 | - | 0.001 | 0.006 | - | 60.833 | 0.238 | 0.027 | - | - | 100.539 | |||||||||||||||
QBXDN-5-2-4 | 谦比希东南 | 脉状 | 磁黄铁矿 | 0.47 | 0 | - | 0.319 | 39.616 | - | - | - | 0.007 | - | 58.268 | 1.25 | 0.063 | 0.035 | 0.025 | 100.053 | |||||||||||||||
QBXDN-5-3-10 | 谦比希东南 | 脉状 | 磁黄铁矿 | 0.489 | 0 | 0.01 | 0.382 | 40.044 | 0.013 | - | - | - | - | 59.408 | 0.391 | 0.07 | - | 0.074 | 100.881 | |||||||||||||||
QBXDN-19-1-3 | 谦比希东南 | 浸染状 | 磁黄铁矿 | 0.622 | 0.009 | - | 0.347 | 37.664 | - | - | - | - | 0.016 | 59.594 | 0.221 | 0.026 | - | - | 98.499 | |||||||||||||||
QBXDN-19-2-4 | 谦比希东南 | 浸染状 | 磁黄铁矿 | 0.566 | 0.008 | - | 0.321 | 37.903 | 0.004 | - | - | 0.003 | 0.004 | 59.246 | 0.43 | 0.038 | 0.019 | - | 98.542 | |||||||||||||||
QBXDN-5-1-1 | 谦比希东南 | 脉状 | 黄铁矿 | 0.556 | 0.018 | - | 0.461 | 53.614 | - | - | 0.007 | 0.001 | - | 41.865 | 4.619 | - | 0.005 | - | 101.146 | |||||||||||||||
QBXDN-5-1-2 | 谦比希东南 | 脉状 | 黄铁矿 | 1.073 | 0.012 | - | 0.425 | 53.654 | 0.004 | 0.084 | 0.008 | - | 0.02 | 41.493 | 4.943 | - | - | 0.007 | 101.723 | |||||||||||||||
QBXDN-5-1-3 | 谦比希东南 | 脉状 | 黄铁矿 | 0.717 | - | 0.005 | 0.433 | 53.556 | - | - | - | - | - | 42.577 | 4.349 | - | 0.01 | - | 101.647 | |||||||||||||||
QBXDN-5-2-5 | 谦比希东南 | 脉状 | 黄铁矿 | 0.365 | 0.017 | 0.013 | 0.458 | 53.806 | 0.005 | - | - | 0.034 | - | 42.531 | 4.406 | 0.034 | 0.023 | - | 101.692 | |||||||||||||||
QBXDN-5-2-6 | 谦比希东南 | 脉状 | 黄铁矿 | 0.516 | - | - | 0.437 | 53.73 | - | - | - | 0.008 | - | 42.667 | 3.783 | 0.001 | 0.016 | 0.069 | 101.227 | |||||||||||||||
QBXDN-5-2-7 | 谦比希东南 | 脉状 | 黄铁矿 | 0.272 | - | - | 0.426 | 53.318 | 0.017 | - | - | 0.002 | - | 42.207 | 4.489 | - | - | - | 100.731 | |||||||||||||||
QBXDN-5-3-8 | 谦比希东南 | 脉状 | 黄铁矿 | 0.327 | - | 0.01 | 0.455 | 53.869 | 0.004 | - | - | - | - | 41.877 | 4.357 | 0.003 | 0.042 | 0.04 | 100.984 | |||||||||||||||
QBXDN-18-1-1 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.346 | - | - | 0.452 | 54.199 | 0.01 | - | - | 0.016 | 0.003 | 46.566 | 0.069 | - | 0.017 | 0.038 | 101.716 | |||||||||||||||
QBXDN-18-1-2 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.348 | 0.031 | 0.038 | 0.467 | 54.949 | 0.001 | - | - | 0.017 | - | 47.284 | 0.056 | 0.051 | 0.063 | 0.031 | 103.336 | |||||||||||||||
QBXDN-18-2-4 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.38 | - | - | 0.454 | 55.32 | - | - | 0.013 | - | - | 46.682 | 0.075 | 0.044 | 0.206 | 0.017 | 103.191 | |||||||||||||||
QBXDN-18-2-5 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.448 | 0.02 | - | 0.493 | 54.916 | 0.003 | - | - | - | 0.003 | 46.927 | 0.067 | - | 0.252 | 0.08 | 103.209 | |||||||||||||||
QBXDN-1-2-13 | 谦比希东南 | 层状/脉状 | 硫钴矿 | 0.039 | 0.009 | 0.01 | 0.278 | 32.133 | - | - | 0.003 | 0.009 | 0.023 | 4.967 | 59.923 | 3.532 | 0.012 | - | 100.938 | |||||||||||||||
QBXDN-1-2-14 | 谦比希东南 | 层状/脉状 | 硫钴矿 | 0.023 | - | - | 0.313 | 32.914 | - | 0.017 | 0.018 | - | 0.002 | 4.834 | 60.251 | 2.813 | 0.05 | - | 101.235 | |||||||||||||||
QBXDN-4-1-1 | 谦比希东南 | 团块状 | 硫钴矿 | 0.018 | 0.036 | - | 0.322 | 32.713 | - | 0.012 | 0.034 | - | - | 4.926 | 60.688 | 2.728 | 0.021 | - | 101.498 | |||||||||||||||
QBXDN-4-1-5 | 谦比希东南 | 团块状 | 硫钴矿 | 0.014 | 0.043 | - | 0.286 | 33.23 | 0.001 | - | - | - | 0.01 | 4.675 | 61.517 | 2.329 | - | - | 102.105 | |||||||||||||||
QBXDN-19-1-2 | 谦比希东南 | 浸染状 | 硫钴矿 | 0.064 | 0.032 | - | 0.269 | 31.96 | 0.008 | 0.006 | - | 0.003 | 0.002 | 7.696 | 57.328 | 0.491 | - | - | 97.859 | |||||||||||||||
QBXDN-19-2-6 | 谦比希东南 | 浸染状 | 硫钴矿 | 0.01 | 0.086 | - | 0.507 | 40.601 | - | 0.01 | 0.004 | - | - | 2.46 | 48.232 | 3.348 | 2.825 | - | 98.083 | |||||||||||||||
QBXDN-1-2-12 | 谦比希东南 | 层状/脉状 | 硫铜钴矿 | 0.096 | 0.028 | 0.028 | 0.272 | 30.611 | 0.008 | - | - | 0.019 | - | 8.58 | 45.879 | 2.243 | 8.742 | - | 96.506 | |||||||||||||||
QBXX-3-1-1 | 谦比希西 | 团块状 | 硫铜钴矿 | - | - | - | 0.358 | 41.828 | 0.02 | 0.01 | - | - | 0.017 | 0.154 | 44.336 | 0.833 | 12.949 | - | 100.505 | |||||||||||||||
QBXX-8-1-1 | 谦比希西 | 团块状 | 硫铜钴矿 | - | 0.014 | 0.024 | 0.331 | 42.286 | 0.004 | - | 0.034 | - | 0.008 | 0.15 | 44.085 | 1.552 | 12.388 | - | 100.876 | |||||||||||||||
QBXX-10-1-1 | 谦比希西 | 团块状 | 硫铜钴矿 | 0.015 | 0.028 | 0.012 | 0.36 | 39.73 | 0.017 | - | 0.025 | - | - | 1.233 | 37.021 | 2.469 | 18.378 | - | 99.288 | |||||||||||||||
QBXX-10-2-3 | 谦比希西 | 团块状 | 硫铜钴矿 | 0.003 | 0.023 | - | 0.329 | 41.656 | 0.003 | - | 0.025 | 0.021 | - | 0.173 | 43.378 | 2.155 | 13.117 | - | 100.883 | |||||||||||||||
QBXX-10-2-4 | 谦比希西 | 团块状 | 硫铜钴矿 | - | 0.007 | - | 0.337 | 41.895 | 0.001 | 0.001 | 0.003 | 0.011 | 0.006 | 0.065 | 43.571 | 2.3 | 12.611 | - | 100.808 |
表1 谦比希矿床硫化物电子探针分析数据
Table 1 Compositions of sulfide orebodies from the Chambishi deposit by EPMA analysis
编号 | 矿体名称 | 矿石构造 | 矿物名称 | wB/% | ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
As | Se | Au | Mo | S | Ag | Sn | Sb | Te | Mn | Fe | Co | Ni | Cu | Zn | Total | |||||||||||||||||||
QBXDN-1-2-4 | 谦比希东南 | 层状/脉状 | 黄铜矿 | 0.292 | - | - | 0.317 | 33.557 | 0.002 | - | 0.009 | - | - | 30.44 | 0.044 | 0.007 | 34.324 | - | 98.992 | |||||||||||||||
QBXDN-1-2-6 | 谦比希东南 | 层状/脉状 | 黄铜矿 | 0.315 | - | - | 0.294 | 33.73 | - | - | 0.004 | - | - | 30.405 | 0.036 | - | 34.576 | 0.026 | 99.386 | |||||||||||||||
QBXDN-4-1-2 | 谦比希东南 | 团块状 | 黄铜矿 | 0.243 | 0.009 | 0.02 | 0.296 | 32.893 | 0.003 | - | 0.01 | 0.004 | - | 29.193 | 0.044 | - | 32.557 | 0.166 | 95.438 | |||||||||||||||
QBXDN-4-1-4 | 谦比希东南 | 团块状 | 黄铜矿 | 0.323 | 0.007 | 0.003 | 0.34 | 34.787 | - | 0.001 | 0.002 | 0.029 | 0.001 | 30.841 | 0.045 | 0.009 | 33.788 | 0.127 | 100.303 | |||||||||||||||
QBXDN-5-3-9 | 谦比希东南 | 脉状 | 黄铜矿 | 0.304 | 0.011 | 0.06 | 0.301 | 35.2 | 0.005 | - | 0.005 | - | - | 30.038 | 0.029 | - | 32.643 | 0.04 | 98.636 | |||||||||||||||
QBXDN-18-1-0 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.277 | - | - | 0.355 | 34.876 | 0.008 | - | - | 0.003 | - | 30.241 | 0.035 | 0.016 | 33.98 | 0.047 | 99.838 | |||||||||||||||
QBXDN-18-2-3 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.298 | - | 0.029 | 0.363 | 35.546 | - | - | - | 0.01 | - | 30.628 | 0.022 | - | 34.602 | 0.037 | 101.535 | |||||||||||||||
QBXDN-18-2-6 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.284 | - | - | 0.373 | 35.46 | - | - | - | - | 0.001 | 30.58 | 0.031 | - | 34.646 | 0.101 | 101.476 | |||||||||||||||
QBXDN-19-1-1 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.311 | 0.018 | - | 0.276 | 33.726 | - | - | 0.001 | - | 0.01 | 30.198 | 0.061 | 0.001 | 32.871 | 0.09 | 97.563 | |||||||||||||||
QBXDN-19-2-5 | 谦比希东南 | 浸染状 | 黄铜矿 | 0.311 | - | - | 0.308 | 33.458 | 0.016 | - | 0.004 | - | - | 30.243 | 0.054 | 0.014 | 33.498 | 0.055 | 97.961 | |||||||||||||||
QBXX-3-2-4 | 谦比希西 | 团块状 | 黄铜矿 | 0.26 | - | 0.039 | 0.306 | 34.204 | - | 0.009 | 0.012 | 0.011 | - | 29.725 | 0.027 | - | 34.06 | 0.027 | 98.68 | |||||||||||||||
QBXX-3-2-4B | 谦比希西 | 团块状 | 黄铜矿 | 0.335 | - | 0.018 | 0.419 | 34.777 | 0.002 | - | - | 0.015 | - | 29.977 | 0.022 | - | 34.496 | 0.031 | 100.092 | |||||||||||||||
QBXX-3-2-6 | 谦比希西 | 团块状 | 黄铜矿 | 0.261 | - | - | 0.34 | 34.24 | 0.006 | - | 0.002 | 0.006 | 0.011 | 29.278 | 0.008 | - | 33.151 | - | 97.303 | |||||||||||||||
QBXX-8-1-2 | 谦比希西 | 团块状 | 黄铜矿 | 0.334 | 0.014 | 0.023 | 0.285 | 35.156 | - | - | - | - | - | 29.752 | 0.024 | - | 33.586 | 0.01 | 99.184 | |||||||||||||||
QBXX-8-2-5 | 谦比希西 | 团块状 | 黄铜矿 | 0.299 | - | 0.014 | 0.395 | 35.035 | - | - | - | 0.009 | - | 30.106 | - | - | 33.513 | 0.05 | 99.421 | |||||||||||||||
QBXX-8-3-7 | 谦比希西 | 团块状 | 黄铜矿 | 0.267 | - | 0.066 | 0.335 | 34.523 | 0.002 | - | - | 0.005 | 0.009 | 29.598 | 0.009 | - | 33.156 | 0.019 | 97.989 | |||||||||||||||
QBXX-10-2-6 | 谦比希西 | 团块状 | 黄铜矿 | 0.257 | 0.031 | 0.014 | 0.304 | 34.551 | 0.025 | - | 0.011 | - | 0.001 | 30.144 | 0.03 | - | 33.371 | 0.066 | 98.805 | |||||||||||||||
QBXX-10-3-7 | 谦比希西 | 团块状 | 黄铜矿 | 0.269 | 0.009 | - | 0.382 | 34.661 | - | - | - | - | 0.005 | 30.367 | 0.061 | - | 33.459 | 0.129 | 99.342 | |||||||||||||||
QBXX-3-1-2 | 谦比希西 | 团块状 | 斑铜矿 | 0.119 | 0.015 | - | 0.303 | 26.291 | 0.049 | - | 0.009 | 0.025 | - | 10.797 | - | - | 62.422 | 0.056 | 100.086 | |||||||||||||||
QBXX-3-2-3 | 谦比希西 | 团块状 | 斑铜矿 | 0.12 | - | - | 0.246 | 25.78 | 0.044 | 0.002 | 0.002 | - | - | 10.944 | 0.012 | - | 62.687 | 0.013 | 99.85 | |||||||||||||||
QBXX-3-2-5 | 谦比希西 | 团块状 | 斑铜矿 | 0.122 | - | 0.005 | 0.253 | 25.775 | 0.043 | - | 0.015 | - | 0.027 | 10.801 | 0.014 | - | 60.795 | 0.035 | 97.885 | |||||||||||||||
QBXX-8-1-3 | 谦比希西 | 团块状 | 斑铜矿 | 0.168 | - | - | 0.257 | 26.693 | 0.029 | - | 0.01 | 0.005 | - | 11.249 | 0.254 | - | 60.313 | 0.024 | 99.002 | |||||||||||||||
QBXX-8-2-4 | 谦比希西 | 团块状 | 斑铜矿 | 0.178 | - | - | 0.234 | 26.446 | 0.032 | - | 0.007 | - | 0.02 | 11.411 | 0.031 | - | 59.897 | 0.022 | 98.278 | |||||||||||||||
QBXX-8-3-6 | 谦比希西 | 团块状 | 斑铜矿 | 0.165 | - | - | 0.286 | 25.481 | 0.025 | - | - | 0.011 | - | 10.693 | 0.008 | - | 57.595 | 0.115 | 94.379 | |||||||||||||||
QBXX-10-1-2 | 谦比希西 | 团块状 | 斑铜矿 | 0.152 | 0.03 | - | 0.23 | 25.707 | 0.058 | 0.009 | 0.014 | 0.004 | - | 11.233 | 0.021 | - | 62.189 | 0.096 | 99.743 | |||||||||||||||
QBXX-10-2-5 | 谦比希西 | 团块状 | 斑铜矿 | 0.124 | - | 0.003 | 0.227 | 25.587 | 0.032 | - | 0.006 | 0.009 | 0.012 | 10.316 | - | - | 61.024 | 0.057 | 97.397 | |||||||||||||||
QBXX-10-3-8 | 谦比希西 | 团块状 | 斑铜矿 | 0.146 | - | 0.019 | 0.205 | 26.222 | 0.03 | - | 0.025 | - | 0.017 | 11.035 | 0.002 | - | 60.584 | 0.057 | 98.342 | |||||||||||||||
QBXDN-1-2-3 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.608 | - | - | 0.342 | 38.29 | 0.016 | 0.003 | - | 0.01 | - | 59.256 | 0.294 | - | - | 0.017 | 98.836 | |||||||||||||||
QBXDN-1-2-5 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.565 | 0.005 | 0.009 | 0.417 | 37.486 | - | - | 0.001 | 0.005 | 0.001 | 59.944 | 0.383 | - | 0.037 | - | 98.853 | |||||||||||||||
编号 | 矿体名称 | 矿石构造 | 矿物名称 | wB/% | ||||||||||||||||||||||||||||||
As | Se | Au | Mo | S | Ag | Sn | Sb | Te | Mn | Fe | Co | Ni | Cu | Zn | Total | |||||||||||||||||||
QBXDN-1-3-15 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.592 | - | - | 0.354 | 37.755 | - | - | - | 0.026 | - | 59.217 | 1.515 | 0.129 | 0.079 | 0.031 | 99.698 | |||||||||||||||
QBXDN-1-3-7 | 谦比希东南 | 层状/脉状 | 磁黄铁矿 | 0.505 | - | 0.015 | 0.382 | 37.563 | - | - | 0.003 | 0.008 | - | 59.857 | 0.469 | 0.013 | - | 0.079 | 98.894 | |||||||||||||||
QBXDN-4-1-3 | 谦比希东南 | 团块状 | 磁黄铁矿 | 0.556 | 0.021 | 0.038 | 0.353 | 38.394 | - | - | 0.017 | 0.009 | - | 60.258 | 0.163 | - | - | 0.014 | 99.823 | |||||||||||||||
QBXDN-4-1-6 | 谦比希东南 | 团块状 | 磁黄铁矿 | 0.472 | 0.028 | - | 0.333 | 38.567 | 0.034 | - | 0.001 | 0.006 | - | 60.833 | 0.238 | 0.027 | - | - | 100.539 | |||||||||||||||
QBXDN-5-2-4 | 谦比希东南 | 脉状 | 磁黄铁矿 | 0.47 | 0 | - | 0.319 | 39.616 | - | - | - | 0.007 | - | 58.268 | 1.25 | 0.063 | 0.035 | 0.025 | 100.053 | |||||||||||||||
QBXDN-5-3-10 | 谦比希东南 | 脉状 | 磁黄铁矿 | 0.489 | 0 | 0.01 | 0.382 | 40.044 | 0.013 | - | - | - | - | 59.408 | 0.391 | 0.07 | - | 0.074 | 100.881 | |||||||||||||||
QBXDN-19-1-3 | 谦比希东南 | 浸染状 | 磁黄铁矿 | 0.622 | 0.009 | - | 0.347 | 37.664 | - | - | - | - | 0.016 | 59.594 | 0.221 | 0.026 | - | - | 98.499 | |||||||||||||||
QBXDN-19-2-4 | 谦比希东南 | 浸染状 | 磁黄铁矿 | 0.566 | 0.008 | - | 0.321 | 37.903 | 0.004 | - | - | 0.003 | 0.004 | 59.246 | 0.43 | 0.038 | 0.019 | - | 98.542 | |||||||||||||||
QBXDN-5-1-1 | 谦比希东南 | 脉状 | 黄铁矿 | 0.556 | 0.018 | - | 0.461 | 53.614 | - | - | 0.007 | 0.001 | - | 41.865 | 4.619 | - | 0.005 | - | 101.146 | |||||||||||||||
QBXDN-5-1-2 | 谦比希东南 | 脉状 | 黄铁矿 | 1.073 | 0.012 | - | 0.425 | 53.654 | 0.004 | 0.084 | 0.008 | - | 0.02 | 41.493 | 4.943 | - | - | 0.007 | 101.723 | |||||||||||||||
QBXDN-5-1-3 | 谦比希东南 | 脉状 | 黄铁矿 | 0.717 | - | 0.005 | 0.433 | 53.556 | - | - | - | - | - | 42.577 | 4.349 | - | 0.01 | - | 101.647 | |||||||||||||||
QBXDN-5-2-5 | 谦比希东南 | 脉状 | 黄铁矿 | 0.365 | 0.017 | 0.013 | 0.458 | 53.806 | 0.005 | - | - | 0.034 | - | 42.531 | 4.406 | 0.034 | 0.023 | - | 101.692 | |||||||||||||||
QBXDN-5-2-6 | 谦比希东南 | 脉状 | 黄铁矿 | 0.516 | - | - | 0.437 | 53.73 | - | - | - | 0.008 | - | 42.667 | 3.783 | 0.001 | 0.016 | 0.069 | 101.227 | |||||||||||||||
QBXDN-5-2-7 | 谦比希东南 | 脉状 | 黄铁矿 | 0.272 | - | - | 0.426 | 53.318 | 0.017 | - | - | 0.002 | - | 42.207 | 4.489 | - | - | - | 100.731 | |||||||||||||||
QBXDN-5-3-8 | 谦比希东南 | 脉状 | 黄铁矿 | 0.327 | - | 0.01 | 0.455 | 53.869 | 0.004 | - | - | - | - | 41.877 | 4.357 | 0.003 | 0.042 | 0.04 | 100.984 | |||||||||||||||
QBXDN-18-1-1 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.346 | - | - | 0.452 | 54.199 | 0.01 | - | - | 0.016 | 0.003 | 46.566 | 0.069 | - | 0.017 | 0.038 | 101.716 | |||||||||||||||
QBXDN-18-1-2 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.348 | 0.031 | 0.038 | 0.467 | 54.949 | 0.001 | - | - | 0.017 | - | 47.284 | 0.056 | 0.051 | 0.063 | 0.031 | 103.336 | |||||||||||||||
QBXDN-18-2-4 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.38 | - | - | 0.454 | 55.32 | - | - | 0.013 | - | - | 46.682 | 0.075 | 0.044 | 0.206 | 0.017 | 103.191 | |||||||||||||||
QBXDN-18-2-5 | 谦比希东南 | 浸染状 | 黄铁矿 | 0.448 | 0.02 | - | 0.493 | 54.916 | 0.003 | - | - | - | 0.003 | 46.927 | 0.067 | - | 0.252 | 0.08 | 103.209 | |||||||||||||||
QBXDN-1-2-13 | 谦比希东南 | 层状/脉状 | 硫钴矿 | 0.039 | 0.009 | 0.01 | 0.278 | 32.133 | - | - | 0.003 | 0.009 | 0.023 | 4.967 | 59.923 | 3.532 | 0.012 | - | 100.938 | |||||||||||||||
QBXDN-1-2-14 | 谦比希东南 | 层状/脉状 | 硫钴矿 | 0.023 | - | - | 0.313 | 32.914 | - | 0.017 | 0.018 | - | 0.002 | 4.834 | 60.251 | 2.813 | 0.05 | - | 101.235 | |||||||||||||||
QBXDN-4-1-1 | 谦比希东南 | 团块状 | 硫钴矿 | 0.018 | 0.036 | - | 0.322 | 32.713 | - | 0.012 | 0.034 | - | - | 4.926 | 60.688 | 2.728 | 0.021 | - | 101.498 | |||||||||||||||
QBXDN-4-1-5 | 谦比希东南 | 团块状 | 硫钴矿 | 0.014 | 0.043 | - | 0.286 | 33.23 | 0.001 | - | - | - | 0.01 | 4.675 | 61.517 | 2.329 | - | - | 102.105 | |||||||||||||||
QBXDN-19-1-2 | 谦比希东南 | 浸染状 | 硫钴矿 | 0.064 | 0.032 | - | 0.269 | 31.96 | 0.008 | 0.006 | - | 0.003 | 0.002 | 7.696 | 57.328 | 0.491 | - | - | 97.859 | |||||||||||||||
QBXDN-19-2-6 | 谦比希东南 | 浸染状 | 硫钴矿 | 0.01 | 0.086 | - | 0.507 | 40.601 | - | 0.01 | 0.004 | - | - | 2.46 | 48.232 | 3.348 | 2.825 | - | 98.083 | |||||||||||||||
QBXDN-1-2-12 | 谦比希东南 | 层状/脉状 | 硫铜钴矿 | 0.096 | 0.028 | 0.028 | 0.272 | 30.611 | 0.008 | - | - | 0.019 | - | 8.58 | 45.879 | 2.243 | 8.742 | - | 96.506 | |||||||||||||||
QBXX-3-1-1 | 谦比希西 | 团块状 | 硫铜钴矿 | - | - | - | 0.358 | 41.828 | 0.02 | 0.01 | - | - | 0.017 | 0.154 | 44.336 | 0.833 | 12.949 | - | 100.505 | |||||||||||||||
QBXX-8-1-1 | 谦比希西 | 团块状 | 硫铜钴矿 | - | 0.014 | 0.024 | 0.331 | 42.286 | 0.004 | - | 0.034 | - | 0.008 | 0.15 | 44.085 | 1.552 | 12.388 | - | 100.876 | |||||||||||||||
QBXX-10-1-1 | 谦比希西 | 团块状 | 硫铜钴矿 | 0.015 | 0.028 | 0.012 | 0.36 | 39.73 | 0.017 | - | 0.025 | - | - | 1.233 | 37.021 | 2.469 | 18.378 | - | 99.288 | |||||||||||||||
QBXX-10-2-3 | 谦比希西 | 团块状 | 硫铜钴矿 | 0.003 | 0.023 | - | 0.329 | 41.656 | 0.003 | - | 0.025 | 0.021 | - | 0.173 | 43.378 | 2.155 | 13.117 | - | 100.883 | |||||||||||||||
QBXX-10-2-4 | 谦比希西 | 团块状 | 硫铜钴矿 | - | 0.007 | - | 0.337 | 41.895 | 0.001 | 0.001 | 0.003 | 0.011 | 0.006 | 0.065 | 43.571 | 2.3 | 12.611 | - | 100.808 |
矿体 | 样品号 | 矿石构造 | 矿物 | δ34SV-CDT/‰ |
---|---|---|---|---|
谦比希西 | QBXX-1 | 团块状 | 斑铜矿 | 6.9 |
谦比希西 | QBXX-3 | 团块状 | 斑铜矿 | 6.7 |
谦比希西 | QBXX-5 | 团块状 | 斑铜矿 | 6.0 |
谦比希西 | QBXX-7 | 团块状 | 斑铜矿 | 6.5 |
谦比希东南 | QBXDN-1 | 脉状 | 磁黄铁矿 | 8.0 |
谦比希东南 | QBXDN-5 | 脉状 | 磁黄铁矿 | 10.9 |
谦比希东南 | QBXDN-10 | 脉状 | 磁黄铁矿 | 12.6 |
谦比希东南 | QBXDN-12 | 脉状 | 磁黄铁矿 | 11.2 |
谦比希东南 | QBXDN-16 | 脉状 | 磁黄铁矿 | 7.2 |
表2 谦比希矿床硫化物S同位素分析数据
Table 2 Results of sulfur isotope analysis of sulfide minerals in the Chambishi deposit
矿体 | 样品号 | 矿石构造 | 矿物 | δ34SV-CDT/‰ |
---|---|---|---|---|
谦比希西 | QBXX-1 | 团块状 | 斑铜矿 | 6.9 |
谦比希西 | QBXX-3 | 团块状 | 斑铜矿 | 6.7 |
谦比希西 | QBXX-5 | 团块状 | 斑铜矿 | 6.0 |
谦比希西 | QBXX-7 | 团块状 | 斑铜矿 | 6.5 |
谦比希东南 | QBXDN-1 | 脉状 | 磁黄铁矿 | 8.0 |
谦比希东南 | QBXDN-5 | 脉状 | 磁黄铁矿 | 10.9 |
谦比希东南 | QBXDN-10 | 脉状 | 磁黄铁矿 | 12.6 |
谦比希东南 | QBXDN-12 | 脉状 | 磁黄铁矿 | 11.2 |
谦比希东南 | QBXDN-16 | 脉状 | 磁黄铁矿 | 7.2 |
图10 谦比希矿床全岩Co与S、Cu、Zn、Ni协变图(图中全岩数据来自文献[10])
Fig.10 Binary plots of Co vs S, Cu, Zn or Ni for whole rocks from the Chambishi deposit. Whole rock data after [10].
图11 谦比希东南矿体黄铁矿和磁黄铁矿Co-Ni协变图 图中沉积型黄铁矿数据来自文献[32],VMS型黄铁矿数据来自文献[26,33],夕卡岩型黄铁矿数据来自文献[34],岩浆型磁黄铁矿数据来自文献[35],夕卡岩型磁黄铁矿数据来自文献[27],赞比亚成矿带沉积型和热液黄铁矿数据来自未发表数据。
Fig.11 Binary plots of Co vs Ni for pyrites and pyrrhotites from the Chambishi Southeast orebody. Pyrite and pyrrhotite data mostly adapted from [26-27, 32-35].
图12 Fe-S系统和lgf(O2)-lgf(S2)矿物相图 hpo—六方磁黄铁矿;mpo—单斜磁黄铁矿;Py—黄铁矿;tr—陨硫铁;Bn—斑铜矿;Cc—辉铜矿;Ccp—黄铜矿;Cr—赤铜矿;Cu—铜单质;Fe—铁单质;Hem—赤铁矿;Mt—磁铁矿;Po—磁黄铁矿;Tn—黑铜矿。 a据参考文献[30],阴影区域表示谦比希磁黄铁矿的温度范围;b据参考文献[36],深色阴影区域和浅色阴影区域分别代表 谦比希东南矿体和谦比希西矿体的硫化物组合对应的lgf(O2)-lgf(S2)范围。
Fig.12 (a) Mineral phases in Fe-S system (adapted form [30]) and (b) lgf(O2)-lgf(S2) plot (adapted from [36]). Data relevant to the Chambishi deposit are represented by shaded areas.
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