GEOCHEMISTRY AND GENESIS OF SHENGMIKENG LEAD-ZINC DEPOSIT IN NORTHERN WUYI, EASTERN CHINA
-
摘要: 生米坑铅锌矿床位于北武夷中生代火山岩带的黄岗山火山盆地内, 已知铅锌矿体呈脉状产于侏罗系上统鹅湖岭组流纹质熔结凝灰岩的断裂内, 或呈细脉——浸染状分布于钾质粗面斑岩内, 发育钾长石化、绿泥石化、硅化等蚀变。地球化学特征显示矿区火山——侵入岩属于贫钠富钾的S型花岗岩, 其w(SiO2)值为62.42%~78.02%、w(K2O +Na2O)值为7.66%~9.13%、w(K2O)/w(Na2O)比值为1.18~2.62、里特曼指数δ为1.67~3.78;矿区岩石LREE/HREE比值平均为10.94×10-6, 属于轻稀土富集型; Eu普遍亏损, 特别是熔结凝灰岩、黑云母花岗岩δEu＜0.31, 表明经历了显著的斜长石的分离结晶作用; 自早至晚主阶段岩浆活动稀土总量逐渐降低。从∑REE总量值、δEu值、地球化学参数及标准稀土元素配分模式图上看, 生米坑铅锌矿化蚀变岩与钾质粗面斑岩具有密切的成因联系。钾质粗面斑岩锆石(SHRIMP)年龄138.3±1.4 Ma, 表明矿床形成于燕山期白垩纪早期, 矿床成因类型属次火山热液型铅锌矿床。Abstract: The Shengmikeng vein-type lead-zinc deposit is located in Huanggangshan volcano-tectonic depression of the Mesozoic volcanic belt in Northern Wuyi.The ore featured by veinlets and disseminations is hosted both inside the fault zone in the upper Jurassic Ehuling ignimbrite and the potassic trachyte porphyry. Geochemical characteristics indicate S-type granites and volcanic rocks depleted in sodium and enriched in potassium, with 62.42%~78.02% w(SiO2), 7.66%~9.13% w(K2O+Na2O), 1.18~2.62 w(K2O)/w(Na2O), and Rittmann index δ of 1.67~3.78. They are enriched in LREE with an average LREE/HREE ratio of 10.94×10-6, and generally depleted Eu with an minimum δEu less than 0.31 especially in the ignimbrite and biotite granite, which have experienced a significant process of separation and crystallization of plagioclases. ΣREE at the main stage of the magmatic activity decreases with time. From the point of the ΣREE, δEu, geochemical parameters and standard REE distribution patterns, lead-zinc mineralization altered rocks in the Shengmikeng deposit have close genetic relationship with the potassic trachyte porphyry with SHRIMP zircon age of 138.3±1.4 Ma. It is suggested that the deposit was formed in the early Cretaceous period during Yanshanian and is of sub-volcanic hydrothermal type.
-
图 1 北武夷火山岩带之天华山———黄岗山火山盆地区域地质简图①
1.第四系; 2.白垩系; 3.上侏罗统; 4.中侏罗统—上三叠统; 5.上古生界; 6.下古生界; 7.前古生界; 8.燕山晚期侵入岩; 9.燕山早期第二阶段侵入岩; 10.燕山早期第一阶段侵入岩; 11.火山盆地; 12.背斜轴; 13.向斜轴; 14.压性、压扭性断裂; 15.张性、张扭性断裂; 16.帚状、旋转构造; 17.性质不明断裂; 18.流面构造产状; 19.片麻理构造产状; 20.银铅锌矿床; 21.铅锌矿床; 22.采样位置及编号
Figure 1. Geological sketch map of Tianhuashan-Huanggangshan volcanic basin in Northern Wuyi Volcanic Belt
图 2 北武夷地区生米坑铅锌矿床地质简图
1.侏罗系上统鹅湖岭组(J3e)流纹质熔结凝灰岩; 2.侏罗系下统水北组(J1s)砂页岩; 3.流纹斑岩; 4.钾质粗面斑岩; 5.喷发不整合地质界线侵入接触界线; 6.蚀变界线; 7.正断层及编号; 8.逆断层及编号; 9.实测矿体及编号; 10.绿泥石化、绿帘石化、方铅矿/闪锌矿; 11.钻孔/平硐及编号; 12.勘探线及编号
Figure 2. Geological sketch map of Shengmikeng Lead-Zinc Deposit in Northern Wuyi area
照片1 流纹质熔结凝灰岩具假流纹构造, 基质由玻璃质—隐晶质组成, 具假流纹构造, 绕晶屑而行
照片1. Rhyolitic ignimbrite, Pseudo-rhyolite structure, with matrix composed of vitreous-crytocrystalline metarial
照片2 钾质粗面斑岩具斑状结构, 斑晶为更—钠长石(Pl)、石英和暗色矿物, 基质具粗面结构, 钾长石微晶具定向性。正交偏光
照片2. Micrograph of potassic trachyte porphy ry, porphyritic structure.Phenocry sts are composed of oligoclase-albite quartz and dark mineral.Matrix is trachyte.Feldspar shows orientation
图 3 矿体纵向厚度品位变化曲线图
Figure 3. Tendency chart of longitudinal thickness and grade of ore bodies
图 4 矿体横向厚度品位变化曲线图
Figure 4. Tendency chart of lateral thickness and grade of ore bodies
照片3 生米坑铅锌矿床V5号铅锌矿体
a、b示钾化(Kfs)、绿泥石化(Chl)、碳酸盐化(Cal)蚀变; c示充填交代结构, 方铅矿(Gn)沿裂隙充填交代闪锌矿(Sp), 反射光(狄永军, 2008年); d示脉状铅锌矿体, 铅灰色、紫红色为铅锌矿, 白色为方解石脉, 灰绿色为强绿泥石化流纹质熔结凝灰岩。
照片3. V5 Lead-Zinc ore-body in Shengmikeng Lead-Zinc Deposit
图 5 生米坑铅锌矿床稀土配分模式图
Figure 5. REE distribution pattern of Ore in Shengmikeng Lead-Zinc Deposit
表 1 生米坑铅锌矿床方铅矿电子探针成分分析结果表(wB/%)
Table 1. Electron probe galena composition in Shengmikeng Lead-Zinc Deposit (wB/%)
表 2 生米坑铅锌矿床闪锌矿电子探针成分分析结果表(wB/%)
Table 2. Electron probe sphalerite composition in Shengmikeng Lead-Zinc Deposit (wB/%)
表 3 生米坑矿床岩石化学分析结果表(wB/%)
Table 3. Chemical analyses of rocks in Shengmikeng Lead-Zinc Deposit (wB/%)
表 4 生米坑铅锌矿床岩石微量元素含量及富集系数一览表(10-6)
Table 4. Trace element content (10-6) and enrichment factor in Shengmikeng Lead-Zinc Deposit
表 5 生米坑铅锌矿床岩石的稀土元素分析结果表(wB/10-6)
Table 5. REE contents of rocks in Shengmikeng Lead-Zinc Deposit (wB/10-6)
表 6 生米坑铅锌矿床岩石的稀土元素总量及配分分析结果(wB/10-6)
Table 6. Chemical analyses of ∑REE (wB/10-6)and REE distribution of rock in Shengmikeng Lead-Zinc Deposit
-
[1] 陈毓川.矿床的成矿系列[J].地学前缘, 1994, 1 (3 ~ 4):90 ~ 94. http://cdmd.cnki.com.cn/Article/CDMD-10674-2004102550.htmCHEN Y C.M etallogenic series of ore deposit[J].Earth Science Frontiers, 1994, 1 (3 ~ 4):90 ~ 94. http://cdmd.cnki.com.cn/Article/CDMD-10674-2004102550.htm [2] 吴淦国, 张达, 彭润民, 等.东南沿海成矿带矿床形成的时间演化规律研究[J].地学前缘, 2004, 11 (1):237 ~ 247. http://d.old.wanfangdata.com.cn/Periodical/dxqy200401021WuGan-guo, Zhang Da, Peng Runmin, et al.Study on the evolution regularity of mineralization ages in SouthChina[J], Earth Science Frontiers, 2004, 11 (1):237 ~ 247. http://d.old.wanfangdata.com.cn/Periodical/dxqy200401021 [3] 罗平, 王永庆, 祝平俊, 等. 北武夷篁碧矿田铜多金属成矿特征[C]. 陈毓川, 毛景文, 薛春纪. 第八届全国矿床会议论文集. 北京: 地质出版社, 2006. 5924 ~ 596.LUO Ping, Wang Yong-qin, Zhu Ping-jun, et al. Mineralization features of copper-polymetal field in Huangbi, Northern Wuyi area[C]. CHEN Yu Chuan, MAO Jing-wen, Xue chunji. The Proceeding of the 8th National Conference of Mineral Deposits, China. Beijing : Geological Publishing House, 2006, 5924 ~ 596. [4] 罗平, 吴淦国, 张达, 等."511"综合找矿方法在矿产勘查中的应用———以北武夷篁碧—梨子坑铅锌银铜成矿带为例[J].中国矿业, 2008, 17 (4):106 ~ 109.LUO Ping, Wu Gan-guo, Zhang Da, et al.The application of " 511" synthetic prospecting methods to mineral exploration———An example from Huangbi-Lizikeng lead-zinc-silver-copper metallogenic belt in northern Wuyi mountain area[J].China Mining Magazine, 2008, 17 (4):106 ~ 109. [5] 翟裕生. 中国重要金属矿产的地质环境及其勘查潜力. 第一届中国探矿者年会文集. 北京: 中国矿业联合会地质勘查协会编, 2004. 7 ~ 11.ZHAI Yu-sheng. China's important metallic mineral geological environment and its exploration Potential. The Collection of the first session of the Chinese Prospector Annual GeneralMeeting. Beijing : Geological Survey Institute of China Mining Association, 2004, 7 ~ 11. [6] 李四光.地质力学概论[M].北京:科学出版社, 1973.11 ~ 136.LI Si-guang.Introduction to geo mechanics[M].Beijing :Science Press, 1973.11 ~ 136. [7] 中国地质科学院地质力学研究所. 论构造体系[A]. 见: 国际交流地质学术论文集(一)区域构造、地质力学[C]. 北京: 地质出版社, 1978. 157 ~ 68.Institute of Geomechanics of Chinese Academy of Geoscience. On the tectonic system[A]. In : International Geological Symposium Ⅰ : Regional tectonics and geomechanics[C]. Beijing : Geological Publishing House, 1978, 157 ~ 68. [8] 刘迅.地质力学在矿田构造研究中的应用与进展[J].地质力学学报, 1996, 2 (1):25 ~ 33. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=19960104&journal_id=dzlxxbLIU Xun.Advance of application of geomechanics to the research of ore-field structures[J].Journal of Geomechanics, 1996, 2 (1):25 ~ 33. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=19960104&journal_id=dzlxxb [9] 刘铁庚, 张乾, 叶霖, 等.自然界中ZnS-CdS完全类质同象系列的发现和初步研究[J].中国地质, 2004, 31(1):40 ~ 45. http://d.old.wanfangdata.com.cn/Periodical/zgdizhi200401005Liu Tie-Geng, Zhang Gan, Ye Lin.et al.Discovery of the complete isomorphous series of ZnS-CdS in nature and its preliminary study[J].Geology inChina, 2004, 31(1):40 ~ 45. http://d.old.wanfangdata.com.cn/Periodical/zgdizhi200401005 [10] 黄振强.冷水坑银矿田成矿条件及矿床特征[J].贵金属地质, 1993, 2 (4):285 ~ 291. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=gjsd199304004&dbname=CJFD&dbcode=CJFQHuang Zhen-qiang.The Mineraelzation conditions and deposit characteristics of Lengshuikeng silver orefield in Jiangxi, China [J].Journal of Precious Metallic Geology, 1993, 2 (4):285 ~ 291. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=gjsd199304004&dbname=CJFD&dbcode=CJFQ [11] 邵飞, 陈晓明, 徐恒力, 等.江西省相山铀矿田成矿模式探讨[J].地质力学学报, 2008, 14 (1):66 ~ 73. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20080106&journal_id=dzlxxbSHAO Fei, CHEN Xiao-ming, XU Heng-li, et al.Metallogenic model of the Xiangshan uranium ore field, Jiangxi province[J]. Journal of Geomechanics, 2008, 14 (1):66 ~ 73. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20080106&journal_id=dzlxxb [12] 黄锡强, 陈正乐, 王平安, 等.江西相山铀矿田沙洲矿床流体包裹体研究[J].地质力学学报. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20080218&journal_id=dzlxxbHUANG Xi-quan, Chen Zheng-le, et al.Fluid inclusion study of the Shazhou uranim orefield in the Xiangshan deposit, Jiangxi [J].Journal of Geomechanics, 2008, 14 (2):177 ~ 185. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20080218&journal_id=dzlxxb [13] 徐贻赣, 许建祥, 刘孔隆.会昌县淘锡坝锡矿地质特征、成因初探及找矿意义[J].江西地质, 2001, 15 (2): 119 ~ 124. http://d.old.wanfangdata.com.cn/Periodical/jxdz200102008XU Yi-gan, XU Jian-xiang, LIU Kong-long.The TaoXiBa Tin deposit HuiChang, Jiangxi:itsgeological features, genesis and ore-searching significance[J].Jiang Xi Geology, 2001, 15 (2):119 ~ 124. http://d.old.wanfangdata.com.cn/Periodical/jxdz200102008 [14] 张家菁, 施光海, 童贵生, 等.浙江徐家墩鹅湖岭组含铜多金属矿火山岩的地球化学与年代学[J].地质学报, 2009, 83 (6):792 ~ 799. http://d.old.wanfangdata.com.cn/Periodical/dizhixb200906005Zhang Jia-jin, Shi Guang-hai, Tong Gui-sheng, et al.Geochemistry and geochronology of copple and polymetal-bearing volcanic rocks of the Erhuling formation in Xujiadun, Zhejiaang province[J].Acta Geologica Sinica, 2009, 83 (6):792 ~ 799. http://d.old.wanfangdata.com.cn/Periodical/dizhixb200906005 [15] 张家菁, 吴木森, 陈郑辉, 等.江西省上饶县金竹坪钼多金属矿床成矿年代学研究[J].岩矿测试, 2009, 28 (3):228 ~ 232. http://d.old.wanfangdata.com.cn/Periodical/ykcs200903007Zhang Jia-jin, Wu Mu-sen, Chen Zheng-hui, et al.Geochronologic study on the Jinzhuping molybdenum-polymetallic deposit fr om Shangrao of Jiangxi Province[J].Rock and Mineral Amalysis, 2009, 28 (3):228 ~ 232. http://d.old.wanfangdata.com.cn/Periodical/ykcs200903007 [16] Hopf S.Behavior of rare earth elements in geothermal systems of New Zealand[J].Journal of Geochemical Exploration, 1993, 47:333 ~ 357. doi: 10.1016/0375-6742(93)90075-W [17] Ban M.Rare-earth element mobility during hydrothermal and metamorphic fluid-rock interaction and the significance of the oxidation state of europium[J].Chemical Geology, 1991, 93:219 ~ 230. doi: 10.1016/0009-2541(91)90115-8 [18] 伍光英, 马铁球, 柏道远, 等.湖南宝山花岗闪长质隐爆角砾岩的岩石学、地球化学特征及锆石SHRIMP定年[J].现代地质, 2005, 19 (2):198 ~ 204. http://d.old.wanfangdata.com.cn/Periodical/xddz200502006WU Guang-ying, Ma Tie-qiu, Bo Dao-yuan, et al.Petrological and geochemical characteristics of granodioritic cryptoexplosion breccia and zircon SHRIMP dating in the Baoshan area, Hunan Province[J].Geoscience, 2005, 19 (2):198 ~ 204. http://d.old.wanfangdata.com.cn/Periodical/xddz200502006 [19] 闫海卿, 汤中立, 焦建刚, 等.内蒙古野芨里镁质—超铁镁质岩体的岩石地球化学特征[J].现代地质, 2005, 19 (4):514 ~ 521. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=xddz200504006&dbname=CJFD&dbcode=CJFQYAN Hai-qinq, TANG Zhong-li, JIAO Jian-gang, et al.Petrological and geochemical characteristics of Yejili mafic-ultra mafic intrusion, Inner Mongolia[J].Geoscience, 2005, 19 (4):514 ~ 521. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=xddz200504006&dbname=CJFD&dbcode=CJFQ [20] 涂光炽.中国层控矿床(第一卷)[M].北京:科学出版社, 1984.13 ~ 69.TU Guang-chi, et al.Geochemistry of stratbound oredeposit in China (Vol.l)[M].Beijing :Science Press, 1984, 13 ~ 69. [21] 毛景文, 谢桂青, 李晓峰, 等.华南地区中生代大规模成矿作用与岩石圈多阶段伸展[J].地学前缘, 2004, 11 (1):46 ~ 55. http://d.old.wanfangdata.com.cn/Periodical/dxqy200401003MAO Jing-wen, XIE Gui-qing, LI Xiao-feng, et al.Mesozoic large scale mineralization and multiple lithospheric south China [J].Earth Science Frontiers, 2004, 11 (1):46 ~ 55. http://d.old.wanfangdata.com.cn/Periodical/dxqy200401003 [22] 邢光福, 杨祝良, 毛建仁, 等.东南大陆边缘早侏罗世火成岩特征及其构造意义[J].地质通报, 2002, 21 (7): 385 ~ 391. http://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD200207004.htmXING Guang-fu, Yang Zhu-liang, Mao Jian-ren, et al.Characteristics of Early Jurassic igneous rocks on the continental margin of southeastern China and their tectonic significance[J].Geological Bulletin of China, 2002, 21 (7):385 ~ 391. http://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD200207004.htm [23] 华仁民, 陈培荣, 张文兰, 等.华南中、新生代与花岗岩类有关的成矿系统[J].中国科学(D辑), 2003, 33 (4):336 ~ 343. http://d.old.wanfangdata.com.cn/Periodical/zgkx-cd200304006HUA Ren-min, Chen Pei-rong, Zhang Wen-lan, et al.The granitoid-related metallogenic system of the M esozoic and Cenozoic in South China[J].Science in China (Series D), 2003, 33 (4):336 ~ 343. http://d.old.wanfangdata.com.cn/Periodical/zgkx-cd200304006 [24] 杨宗良, 杨世坤, 王正常, 等.云南姚安老街子铅矿地质及银的赋存状[J].云南地质, 2007, 26 (1):106 ~ 111. http://d.old.wanfangdata.com.cn/Periodical/yndz200701015YANG Zong-liang, Yang Shi-kun, Wang Zheng-chang, et al.The geology of Laojiezi Pb deposit, and existence of Ag, Yaoan Yunnan[J].Yunnan Geology, 2007, 26 (1):106 ~ 111. http://d.old.wanfangdata.com.cn/Periodical/yndz200701015 [25] 邱检生, B. I. A. McInnes, 蒋少涌, 等. 江西会昌密坑山岩体的地球化学及其成因类型的新认识[J]. 地球化学, 2005, 34 (1): 21 ~ 32. http://d.old.wanfangdata.com.cn/Periodical/dqhx200501003QIU Jian-shen, B.I.A.McInnes, JIANG Shao-yong, et al.Geochemistry of the Mikengshan pluton in Huichang County, Jiangxi Province and new recognition about its genetic type[J].Geochimical, 2005, 34 (1):21 ~ 32. http://d.old.wanfangdata.com.cn/Periodical/dqhx200501003 -
下载:
计量
- 文章访问数: 187
- HTML全文浏览量: 82
- PDF下载量: 5
- 被引次数: 0
