胶东栖霞金矿集区早白垩世花岗岩形成时代及地质意义
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摘要
栖霞金矿集区位于胶东半岛中部,是胶东金矿集中区的重要组成部分,其成因是否与花岗岩有关存在不同的认识。栖霞金矿集区花岗岩体LA-ICP-MS锆石U-Pb年龄分析结果表明,其年龄为122～118 Ma,与金矿成矿年龄基本一致,暗示金矿与花岗岩可能存在成因联系。花岗岩SiO_2含量为65%～70%, Na_2O/K_2O=0.96～1.27,多数样品大于1.0; Na_2O+K_2O值为7.48%～8.06%,铝指数A/CNK=0.90～1.0,属于高钾钙碱性准铝质Ⅰ型花岗岩;这些花岗岩以高Sr(Sr>600μg/g)、低Y和Yb(Y<13μg/g, Yb<1.1μg/g)、相对亏损高场强元素(如Nb、Ta、Zr和Hf)及轻重稀土元素分馏强烈((La/Yb)N=32.86～53.24)为特征,与胶东地区郭家岭花岗闪长岩地球化学特征十分类似,均属于高钾钙碱性埃达克质岩石,可能是在华北克拉通破坏背景下,拆沉下地壳的镁铁质岩石部分熔融形成的。
The Qixia gold concentration area located in the central part of the Jiaodong Peninsula is an important part of the Jiaodong gold province. The relationship between the gold mineralization and the granite magmatism in the region is still controversy. LA-ICP-MS zircon U-Pb dating of the granites in the Qixia area yield ages of 122 to 118 Ma. The ages of the granites are consistent with that of the gold mineralization, which suggests a genetic relationship between the gold mineralization and granites. The granites in the Qixia area have SiO_2 contents of 65% to 70%, Na_2O+K_2O contents of 7.48% to 8.06%, Na_2O/K_2O ratios of 0.96 to 1.27(mostly higher than 1.0), aluminum index(A/CNK) of 0.9 to 1.0, therefore, the granites belong to high potassium calc-alkaline metaluminous I type granite. The granites are characterized by enrichment in Sr(Sr>600 μg/g), depletion in Y(Y<13 μg/g), Yb(Yb<1.1 μg/g) and high field strength elements(HSFE) such as Nb, Ta, Zr and Hf, and strong rare earth element fractionation(LaN/YbN=32.86 to 53.24). These geochemical features and the Guojialing granodiorites in Jiaodong alike belong to high-K calc-alkaline adakite. It can be inferred that the granites in the Qixia area are possibly partial melts of the delaminated lower crustal mafic rocks under the tectonic regime of the destruction of the North China Craton.
The Qixia gold concentration area located in the central part of the Jiaodong Peninsula is an important part of the Jiaodong gold province. The relationship between the gold mineralization and the granite magmatism in the region is still controversy. LA-ICP-MS zircon U-Pb dating of the granites in the Qixia area yield ages of 122 to 118 Ma. The ages of the granites are consistent with that of the gold mineralization, which suggests a genetic relationship between the gold mineralization and granites. The granites in the Qixia area have SiO_2 contents of 65% to 70%, Na_2O+K_2O contents of 7.48% to 8.06%, Na_2O/K_2O ratios of 0.96 to 1.27(mostly higher than 1.0), aluminum index(A/CNK) of 0.9 to 1.0, therefore, the granites belong to high potassium calc-alkaline metaluminous I type granite. The granites are characterized by enrichment in Sr(Sr>600 μg/g), depletion in Y(Y<13 μg/g), Yb(Yb<1.1 μg/g) and high field strength elements(HSFE) such as Nb, Ta, Zr and Hf, and strong rare earth element fractionation(LaN/YbN=32.86 to 53.24). These geochemical features and the Guojialing granodiorites in Jiaodong alike belong to high-K calc-alkaline adakite. It can be inferred that the granites in the Qixia area are possibly partial melts of the delaminated lower crustal mafic rocks under the tectonic regime of the destruction of the North China Craton.
引文
范宏瑞,冯凯,李兴辉,胡芳芳,杨奎锋.2016.胶东?朝鲜半岛中生代金成矿作用.岩石学报,32(10):3225-3238.
高山,金振民.1997.拆沉作用及壳?幔演化动力学意义.地质科技情报,16(1):1-9.
高山,张本仁,金振民.1999.秦岭?大别造山带下地壳拆沉作用.中国科学(D辑),29(6):532-541.
高山,章军锋,许文良,刘勇胜.2009.拆沉作用与华北克拉通破坏.科学通报,54(14):1962-1973.
耿瑞,孙丰月,丁正江,胡伟华.2012.山东栖霞地区与金矿有关的煌斑岩地球化学特征及成因探讨.地质与资源,21(2):229-233.
郭敬辉,陈福坤,张晓曼,Siebel W,翟明国.2005.苏鲁超高压带北部中生代岩浆侵入活动与同碰撞?碰撞后构造过程:锆石U-Pb年代学.岩石学报,21(4):1281-1301.
季海章,赵懿英,卢冰,陈殿照.1992.胶东地区煌斑岩与金矿关系初探.地质与勘探,28(2):15-18.
廖明伟,陈玉菡,谢军民.2014.山东省栖霞市笏山西陡崖金矿地质特征及深部找矿远景.山东国土资源,30(4):21-26.
刘燊.2004.山东地区中生代岩浆作用与地壳拉张--兼论煌斑岩与金成矿的关系.贵阳:中国科学院地球化学研究所博士学位论文.
罗镇宽,关康,苗来成.2001.胶东玲珑金矿田煌斑岩脉与成矿关系的讨论.黄金地质,7(4):15-21.
王世进,王来明,万渝生,张成基,宋志勇,王金光.2009.鲁东地区侵入岩形成时代和期次划分--锆石SHRIMP U-Pb年龄的证据.山东国土资源,25(12):8-20.
王新红.2014.山东省栖霞市小灵山金矿床地球化学特征与控矿因素研究.南昌:东华理工大学硕士学位论文.
许方.2007.山东省栖霞市山城金矿后夼金矿区地质特征及找矿方向.山东国土资源,23(11):6-10.
许方.2008.山东省栖霞台前金矿床地质特征及找矿方向.地质找矿论丛,23(2):140-143.
阎方,姜平田.2003.山东栖霞庄子金矿床地质特征.地质找矿论丛,18(2):118-121.
杨进辉,朱美妃,刘伟,翟明国.2003.胶东地区郭家岭花岗闪长岩的地球化学特征及成因.岩石学报,19(4):692-700.
余普贤,徐怀峰,曹铁生,胡伟华.2008.山东栖霞金矿的空间分布及其矿化特征.山东国土资源,24(3):31-34.
张国刚.2008.山东栖霞区域地质特征及找矿标志和方向.黄金科学技术,16(4):54-57.
张旗,许继峰,王焰,肖龙,刘红涛,王元龙.2004.埃达克岩的多样性.地质通报,23(9?10):959-965.
赵明传,段留安,宋耕海,王先林.2016.山东栖霞金山金矿床地质特征及找矿预测.黄金科学技术,24(2):67-75.
朱日祥,范宏瑞,李建威,孟庆任,李胜荣,曾庆栋.2015.克拉通破坏型金矿床.中国科学:地球科学,45(8):1153-1168.
Botcharnikov R E,Linnen R L,Wilke M,Holtz F,Jugo P Jand Berndt J.2011.High gold concentrations in sulphidebearing magma under oxidizing conditions.Nature Geoscience,4(2):112-115.
Defant M J and Drummond M S.1990.Derivation of some modern arc magmas by melting of young subduction lithosphere.Nature,347(6294):662-665.
Defant M J and Drummond M S.1993.Mount St.Helens:Potential example of the partial melting of the subducted lithosphere in a volcanic arc.Geology,21(6):547-550.
Drummond M S and Defant M J.1990.A model for trondhjemite-tonalite-dacite genesis and crustal growth via slab melting:Archean to modern comparisons.Journal Geophysical Research,95(B13):21503-21521.
Hu F F,Fan H R,Jiang X H,Li X C,Yang K F and Mernagh T.2013.Fluid inclusions at different depths in the Sanshandao gold deposit,Jiaodong Peninsula,China.Geofluids,13(4):528-541.
Hu F F,Fan H R,Yang J H,Wan Y S,Liu D Y,Zhai M Gand Jin C W.2004.Mineralizing age of the Rushan lode gold deposit in the Jiaodong Peninsula:SHRIMP U-Pb dating on hydrothermal zircon.Chinese Science Bulletin,49(15):1629-1636.
Li J W,Bi S J,Selby D,Chen L,Vasconcelos P,Thiede D,Zhou M F,Zhao X F,Li Z K and Qiu H N.2012.Giant Mesozoic gold provinces related to the destruction of the North China Craton.Earth and Planetary Science Letters,349(4):26-37.
Li J W,Vasconcelos P M,Zhang J,Zhou M,Zhang X J and Yang F H.2003.40Ar/39Ar constraints on a temporal link between gold mineralization,magmatism,and continental margin transtension in the Jiaodong gold province,eastern China.Journal of Geology,111(6):741-751.
Li J W,Vasconcelos P M,Zhou M F,Zhao X F and Ma C Q.2006.Geochronology of the Pengjiakuang and Rushan gold deposits,eastern Jiaodong gold province,northeastern China:Implications for regional mineralization and geodynamic setting.Economic Geology,101(5):1023-1038.
Li Q L,Chen F K,Yang J H and Fan H R.2008.Single grain pyrite Rb-Sr dating of the Linglong gold deposit,eastern China.Ore Geology Reviews,34(3):263-270.
Li S R and Santosh M.2014.Metallogeny and craton destruction:records from the North China Craton.Ore Geology Reviews,56(1):376-414.
Li S R,Santosh M,Zhang H F,Luo J Y,Zhang J Q,Li C L,Song J Y and Zhang X B.2014.Metallogeny in response to lithospheric thinning and craton destruction:Geochemistry and U-Pb zircon chronology of the Yixingzhai gold deposit,central North China Craton.Ore Geology Reviews,56(1):457-471.
Middlemost E A.1994.Naming materials in the magma/igneous rock system.Earth-Science Reviews,37(3-4):215-224.
Morrison G W.1980.Characteristics and tectonic setting of the shoshonite rock association.Lithos,13(1):97-108.
Peacock S M,Rushmer T and Thompson A B.1994.Partial melting of subducting oceanic crust.Earth and Planetary Science Letters,121(1-2):227-244.
Prouteau G,Scaillet B,Pichavant M and Mauty R C.2001.Evidence for mantle metasomatism by hydrous silici melts derived from subducted oceanic crust.Nature,410(6825):197-200.
Qu X M,Hou Z Q and Li Y G.2004.Melt components derived from a subducted slab in late orogenic ore-bearing porphyries in the Gangdese copper belt,southern Tibetan plateau.Lithos,74(3):131-148.
Rapp R P,Watson E B and Miller C F.1991.Partial melting of amphibolite/eclogite and the origin of Archean trondhjemites and tonalites.Precambrian Research,51(1-4):1-25.
Sun S S and Mc Donough W F.1989.Chemical and isotopic systematic basalt:Implication for mantle composition and processes//Saunders A D and Norry M J.Magmatism in the Ocean Basins.Geological Society,Special Publication,42(1):313-345.
Wang L,Qiu Y,Mc Naughton N J,Groves D I,Luo Z K,Huang J Z,Miao L C and Liu Y K.1998.Constraints on crustal evolution and gold metallogeny in the Northeastern Jiaodong Peninsula,China,from SHRIMPU-Pb zircon studies of granitoids.Ore Geology Reviews,13(1-5):275-291.
Whalen J B,Currie K L and Chappell B W.1987.A-type granites:Geochemical characteristics,discrimination and petrogenesis.Contributions to Mineralogy and Petrology,95(4):407-419.
Zhang X O,Cawood P A,Wilde S A,Liu R,Song H,Li W and Snee L W.2003.Geology and timing of mineralization at the Cangshang gold deposit,north-western Jiaodong Peninsula,China.Mineralium Deposita,38(2):141-153.
高山,金振民.1997.拆沉作用及壳?幔演化动力学意义.地质科技情报,16(1):1-9.
高山,张本仁,金振民.1999.秦岭?大别造山带下地壳拆沉作用.中国科学(D辑),29(6):532-541.
高山,章军锋,许文良,刘勇胜.2009.拆沉作用与华北克拉通破坏.科学通报,54(14):1962-1973.
耿瑞,孙丰月,丁正江,胡伟华.2012.山东栖霞地区与金矿有关的煌斑岩地球化学特征及成因探讨.地质与资源,21(2):229-233.
郭敬辉,陈福坤,张晓曼,Siebel W,翟明国.2005.苏鲁超高压带北部中生代岩浆侵入活动与同碰撞?碰撞后构造过程:锆石U-Pb年代学.岩石学报,21(4):1281-1301.
季海章,赵懿英,卢冰,陈殿照.1992.胶东地区煌斑岩与金矿关系初探.地质与勘探,28(2):15-18.
廖明伟,陈玉菡,谢军民.2014.山东省栖霞市笏山西陡崖金矿地质特征及深部找矿远景.山东国土资源,30(4):21-26.
刘燊.2004.山东地区中生代岩浆作用与地壳拉张--兼论煌斑岩与金成矿的关系.贵阳:中国科学院地球化学研究所博士学位论文.
罗镇宽,关康,苗来成.2001.胶东玲珑金矿田煌斑岩脉与成矿关系的讨论.黄金地质,7(4):15-21.
王世进,王来明,万渝生,张成基,宋志勇,王金光.2009.鲁东地区侵入岩形成时代和期次划分--锆石SHRIMP U-Pb年龄的证据.山东国土资源,25(12):8-20.
王新红.2014.山东省栖霞市小灵山金矿床地球化学特征与控矿因素研究.南昌:东华理工大学硕士学位论文.
许方.2007.山东省栖霞市山城金矿后夼金矿区地质特征及找矿方向.山东国土资源,23(11):6-10.
许方.2008.山东省栖霞台前金矿床地质特征及找矿方向.地质找矿论丛,23(2):140-143.
阎方,姜平田.2003.山东栖霞庄子金矿床地质特征.地质找矿论丛,18(2):118-121.
杨进辉,朱美妃,刘伟,翟明国.2003.胶东地区郭家岭花岗闪长岩的地球化学特征及成因.岩石学报,19(4):692-700.
余普贤,徐怀峰,曹铁生,胡伟华.2008.山东栖霞金矿的空间分布及其矿化特征.山东国土资源,24(3):31-34.
张国刚.2008.山东栖霞区域地质特征及找矿标志和方向.黄金科学技术,16(4):54-57.
张旗,许继峰,王焰,肖龙,刘红涛,王元龙.2004.埃达克岩的多样性.地质通报,23(9?10):959-965.
赵明传,段留安,宋耕海,王先林.2016.山东栖霞金山金矿床地质特征及找矿预测.黄金科学技术,24(2):67-75.
朱日祥,范宏瑞,李建威,孟庆任,李胜荣,曾庆栋.2015.克拉通破坏型金矿床.中国科学:地球科学,45(8):1153-1168.
Botcharnikov R E,Linnen R L,Wilke M,Holtz F,Jugo P Jand Berndt J.2011.High gold concentrations in sulphidebearing magma under oxidizing conditions.Nature Geoscience,4(2):112-115.
Defant M J and Drummond M S.1990.Derivation of some modern arc magmas by melting of young subduction lithosphere.Nature,347(6294):662-665.
Defant M J and Drummond M S.1993.Mount St.Helens:Potential example of the partial melting of the subducted lithosphere in a volcanic arc.Geology,21(6):547-550.
Drummond M S and Defant M J.1990.A model for trondhjemite-tonalite-dacite genesis and crustal growth via slab melting:Archean to modern comparisons.Journal Geophysical Research,95(B13):21503-21521.
Hu F F,Fan H R,Jiang X H,Li X C,Yang K F and Mernagh T.2013.Fluid inclusions at different depths in the Sanshandao gold deposit,Jiaodong Peninsula,China.Geofluids,13(4):528-541.
Hu F F,Fan H R,Yang J H,Wan Y S,Liu D Y,Zhai M Gand Jin C W.2004.Mineralizing age of the Rushan lode gold deposit in the Jiaodong Peninsula:SHRIMP U-Pb dating on hydrothermal zircon.Chinese Science Bulletin,49(15):1629-1636.
Li J W,Bi S J,Selby D,Chen L,Vasconcelos P,Thiede D,Zhou M F,Zhao X F,Li Z K and Qiu H N.2012.Giant Mesozoic gold provinces related to the destruction of the North China Craton.Earth and Planetary Science Letters,349(4):26-37.
Li J W,Vasconcelos P M,Zhang J,Zhou M,Zhang X J and Yang F H.2003.40Ar/39Ar constraints on a temporal link between gold mineralization,magmatism,and continental margin transtension in the Jiaodong gold province,eastern China.Journal of Geology,111(6):741-751.
Li J W,Vasconcelos P M,Zhou M F,Zhao X F and Ma C Q.2006.Geochronology of the Pengjiakuang and Rushan gold deposits,eastern Jiaodong gold province,northeastern China:Implications for regional mineralization and geodynamic setting.Economic Geology,101(5):1023-1038.
Li Q L,Chen F K,Yang J H and Fan H R.2008.Single grain pyrite Rb-Sr dating of the Linglong gold deposit,eastern China.Ore Geology Reviews,34(3):263-270.
Li S R and Santosh M.2014.Metallogeny and craton destruction:records from the North China Craton.Ore Geology Reviews,56(1):376-414.
Li S R,Santosh M,Zhang H F,Luo J Y,Zhang J Q,Li C L,Song J Y and Zhang X B.2014.Metallogeny in response to lithospheric thinning and craton destruction:Geochemistry and U-Pb zircon chronology of the Yixingzhai gold deposit,central North China Craton.Ore Geology Reviews,56(1):457-471.
Middlemost E A.1994.Naming materials in the magma/igneous rock system.Earth-Science Reviews,37(3-4):215-224.
Morrison G W.1980.Characteristics and tectonic setting of the shoshonite rock association.Lithos,13(1):97-108.
Peacock S M,Rushmer T and Thompson A B.1994.Partial melting of subducting oceanic crust.Earth and Planetary Science Letters,121(1-2):227-244.
Prouteau G,Scaillet B,Pichavant M and Mauty R C.2001.Evidence for mantle metasomatism by hydrous silici melts derived from subducted oceanic crust.Nature,410(6825):197-200.
Qu X M,Hou Z Q and Li Y G.2004.Melt components derived from a subducted slab in late orogenic ore-bearing porphyries in the Gangdese copper belt,southern Tibetan plateau.Lithos,74(3):131-148.
Rapp R P,Watson E B and Miller C F.1991.Partial melting of amphibolite/eclogite and the origin of Archean trondhjemites and tonalites.Precambrian Research,51(1-4):1-25.
Sun S S and Mc Donough W F.1989.Chemical and isotopic systematic basalt:Implication for mantle composition and processes//Saunders A D and Norry M J.Magmatism in the Ocean Basins.Geological Society,Special Publication,42(1):313-345.
Wang L,Qiu Y,Mc Naughton N J,Groves D I,Luo Z K,Huang J Z,Miao L C and Liu Y K.1998.Constraints on crustal evolution and gold metallogeny in the Northeastern Jiaodong Peninsula,China,from SHRIMPU-Pb zircon studies of granitoids.Ore Geology Reviews,13(1-5):275-291.
Whalen J B,Currie K L and Chappell B W.1987.A-type granites:Geochemical characteristics,discrimination and petrogenesis.Contributions to Mineralogy and Petrology,95(4):407-419.
Zhang X O,Cawood P A,Wilde S A,Liu R,Song H,Li W and Snee L W.2003.Geology and timing of mineralization at the Cangshang gold deposit,north-western Jiaodong Peninsula,China.Mineralium Deposita,38(2):141-153.