闽中梅仙峰岩铅锌矿床地球化学特征及其古构造环境

张达; 吴淦国; 狄永军; 余心起; 彭润民; 黄火剑

闽中梅仙峰岩铅锌矿床地球化学特征及其古构造环境

张达^{1, 2,},
吴淦国^{1, 2},
狄永军¹,
余心起¹,
彭润民^{1, 2},
黄火剑¹

1.
中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083
2.
中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室, 北京 100083

基金项目:

国家自然科学基金项目 40372050

地质调查项目"武夷山成矿带铜多金属成矿规律研究" 1212010533105

"武夷山成矿带中生代推覆构造与铜多金属找矿方向研究" 1212010813064

详细信息

作者简介:
张达(1967-), 男, 教授, 研究生, 主要从事构造地质学及区域成矿规律研究。E-mail:zhangda@cugb.edu.cn

中图分类号: P578.2, P588.3
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出版历程
- 收稿日期: 2008-12-26
- 刊出日期: 2009-03-01

GEOCHEMISTRY AND PALEO-TECTONIC ENVIRONMENT OF FENGYAN Pb-Zn ORE DEPOSIT IN MEIXIAN, CENTRAL FUJIAN PROVINCE

ZHANG Da^{1, 2
,},
WU Gan-guo^{1, 2},
DI Yong-jun¹,
YU Xin-qi¹,
PENG Run-min^{1, 2},
HUANG Huo-jian¹

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Key Laboratory of Lithospheric Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences, Beijing 100083, China

摘要

摘要: 尤溪梅仙峰岩铅锌银矿床位于政和-德化前寒武纪变质分布区的南端, 处于北东向丽水-海丰断裂东侧闽东火山断拗带的次级寿宁-华安基底隆起带内。峰岩矿床的含矿岩系主要为上元古界马面山群东岩组(Pt₃dy)。铅锌银矿体具层控特点。岩石学及地球化学研究表明赋矿地层东岩组为以绿片岩为主的一套古火山沉积建造。绿片岩的原岩为玄武岩类, 变粒岩主要为英安岩及流纹岩。玄武岩浆的形成可能和板块俯冲相关。矿床地球化学研究表明矿床存在多次成矿作用和多种硫源。铅同位素组成与演化表明从幔源至造山带和上地壳不同的铅源均有混入, 演化趋势较明显, 并显示多次地质事件叠加特点。金属硫化物的稀土分布型式都表现为一定程度的右倾斜, 轻重稀土分异显著。微量元素相对于MORB均有不同程度的亏损和富集。高场强元素(HFSE:Nb、Ta、Zr、Hf)表现为明显的负异常, 具较强烈的亏损; 而Pb、Rb和Ba等元素相对富集。东岩组变质火山岩也表现为明显的高场强元素的亏损及低场强元素的富集, 显示出典型和俯冲有关的岛弧岩浆的特征, 表明矿床与东岩组火山岩都形成于俯冲背景下的岛弧环境。
- 峰岩铅锌矿床 /
- 地球化学 /
- 古岛弧 /
- 东岩组 /
- 闽中
Abstract: Pb-Zn-Ag ore deposit in Meixian, Youxi County is located at the south of the Zhenghe-Dehua pre-Cambrian metamorphic area, and geologically situated at Shouning-Hua' an sub-basement uplift zone in Eastern Fujian volcanic depression belt, east of the NE-striking Lishui-Haifeng fault. The ore-bearing beds of Fengyan ore deposit is mainly the Upper Proterozoic Dongyan Fomation of Mamianshan Group (Pt₃dy). The Pb-Zn-Ag ore bodies are of strata bound type. Petrology and geochemistry studies show that the ore-bearing Dongyan Formation is a paleo-volcanic sedimentary formation dominated by greenshists. The formation of the basaltic magma may be related to the slab subduction.The original rocks of the greenshists are basaltic rocks, and granulites are mainly dacite and rhyolite. Geochemical study of ore deposit reveals that the ore deposit is characterized by multiple ore-forming processes and various kinds of sulfur sources. The composition and evolution of Pb isotopes show that different Pb sources from mantle to orogenic belt and upper crust are intermingled.The evolvement is of clear trend and demonstrates a superposition of multiple geological events. The REE pattern of metal sulfides shows a down-to-right slope with remarkable differentiation between LREE and HREE.Compared to MORB, the different trace elements are depleted and enriched to different degrees. High field strength elements (HFSE:Nb, Ta, Zr, Hf)show distinct negative anomaly and are strongly depleted while Pb, Rb and Ba are relatively enriched. Metavolcanics in the Dongyan Formation, with the same trend of HFSE depletion and the enrichment of LFSE, displays typical features of arc-magma related to subduction and indicates that the ore deposit and the Dongyan vocanics were formed under the arc environment with subduction background.
- Fengyan Pb-Zn ore deposit /
- geochemistry /
- paleo-arc /
- Dongyan Formation /
- central Fujian

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图 1 闽中地区地质构造略图

Figure 1. Geological and structural sketch map of central Fujian Province

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图 2 尤溪峰岩铅锌银矿区地质略图(据闽西队资料修改)

1-上侏罗统南园组; 2-下侏罗统梨山组; 3-新元古界东岩组1-3段; 4-新元古界大岭组; 5-花岗斑岩; 6-背斜及向斜; 7-矿体; 8-断层及编号; 9-角度不整合

Figure 2. Geological sketch map of the Fengyan Pb-Zn-Ag deposit in Youxi County

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图 3 尤溪梅仙峰岩铅锌银矿区47线地质剖面(据闽西队资料修编)

J₃n-上侏罗统南园组; J₁l-下侏罗统梨山组; Pt₃dy³, Pt₃dy², Pt₃dy¹-新元古界东岩组第三、二、一段; Pt₃dl-新元古界大岭组; γ π-花岗斑岩; Ⅲ₁, Ⅲ₂, Ⅰ₁, Ⅰ₂, Ⅰ₃, Ⅰ₄-铅锌银矿体及编号

Figure 3. No. 47 geological profile of the Fengyan Pb-Zn-Ag deposit in Youxi County

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图 4 闽中地区东岩组不同类型变质岩类SiO₂-(Na₂O +K₂O)图解(图式据Le Maitre et al, 1989)

Figure 4. SiO₂-(Na₂O+K₂O)diagram of various metamorphic rocks in the Dongyang Formation of central Fujian (After Le Maitre et al, 1989)

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图 5 马面山群东岩组三角图解(图式据Pearce和Cann^[9])

A区-岛弧拉斑玄武岩; B区-MORB、岛弧拉斑玄武岩和钙碱性玄武岩; C区-钙碱性玄武岩; D区-板内玄武岩

Figure 5. Ternary discrimination diagram of Dongyan Formation from Mamianshan Group

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图 6 闽中东岩组绿片岩稀土配分模式图

Figure 6. Rare earth element abundances normalized to chondritic meteorite values against atomic number for greeschist of Dongyan Group

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图 7 闽中地区东岩组绿片岩微量元素标准化蛛网图(图式据Pearce J A^[10])

Figure 7. Normalized diagram of trace element concentrations for schist of Dongyan Group in central Fujian Province

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图 8 梅仙峰岩矿区硫同位素分布频率

Figure 8. Diagram of S isotope distribution of Fengyan deposit

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图 9 梅仙峰岩及丁家山铅锌矿区铅同位素组成(图式据Doe和Zartman^[11])

a-地幔演化线; b-造山带; c-上部地壳演化线; SK-两阶段演化线

Figure 9. Diagram of Pb stable isotope composition of Fengy an and Dingjiashan deposits

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图 10 闽中梅仙峰岩铅锌矿矿石中单矿物稀土配分模式图

Figure 10. Rare earth element abundances normalized to chondritic meteorite values against atomic number for minerals in Fengyan deposit

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图 11 闽中尤溪梅仙峰岩矿石金属矿物微量元素标准化蛛网图(图式据Pearce J A^[10])

Figure 11. Normalized diagram of trace element concentrations for schist of metal minerals from Fengyan deposit

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表 1 闽中东岩组变质火山岩化学成分

Table 1. Chemical compositions of the Dongyan metamorphic volcanic rocks in central Fujian Province

表 2 闽中东岩组变质火山岩稀土元素分析数据

Table 2. REE data of the Dongyan metamorphic volcanic rocks in central Fujian Province

表 3 闽中尤溪梅仙一带铅、硫同位素组成

Table 3. Pb and S stable isotopic compositions of Meixian deposit in Youxi County, central Fujian Province

表 4 闽中尤溪梅仙峰岩矿床矿石中金属矿物微量及稀土化学元素测试结果

Table 4. Trace element and REE data of the Fengyan deposit in Youxi County, central Fujian Province

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