河南省淅川县毛堂金矿区花岗斑岩锆石U-Pb年龄、Hf同位素特征及其地质意义
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摘要
毛堂金矿是位于河南省"毛堂—蒲塘铜金矿带"上的一个小型金矿,矿体主要产于老田岩体的Ⅲ号岩体中,成矿作用与隐爆角砾岩和花岗斑岩关系密切。通过对与成矿有关的隐爆角砾岩和花岗斑岩进行LA-ICP-MS锆石U-Pb同位素测年,获得其成岩年龄分别为143.0 Ma±1.2 Ma和141.4Ma±1.5Ma,代表矿床的形成时代;对花岗斑岩进行Hf同位素测试,其εHf(t)值分布范围为-3.4～4.2,平均为1.6,显示其源区为镁铁质新生地壳。毛堂金矿形成于早白垩世,受花岗斑岩、隐爆角砾岩及其构造-裂隙控制,矿床类型属于隐爆角砾岩型金矿。
Maotang gold deposit is a small gold deposit located in the copper-gold belt of Maotang-Putang,Henan province.The ore body mainly occurred in the No.3 rock mass of the Laotian intrusion.The mineralization is closely related to cryptoexplosive breccia and granite porphyry.The LA-ICP-MS zircon U-Pb isotopic dating of the cryptoexplosive breccia and granite porphyry reveals that their diagenetic ages are 143.0 Ma±1.2 Ma and 141.4 Ma±1.5 Ma,respectively,representing the age of the deposit formation;the Hf isotopic test of granite porphyry shows that the distribution range of the values is-3.4 to+4.2,with an average of 1.6.It shows that the magma source area is the newborn mafic crust.The Matang gold deposit was formed in the early Cretaceous,controlled by granite porphyry,cryptoexplosive breccia,structures and fractures at all levels,and belongs to the cryptoexplosion breccia type.
Maotang gold deposit is a small gold deposit located in the copper-gold belt of Maotang-Putang,Henan province.The ore body mainly occurred in the No.3 rock mass of the Laotian intrusion.The mineralization is closely related to cryptoexplosive breccia and granite porphyry.The LA-ICP-MS zircon U-Pb isotopic dating of the cryptoexplosive breccia and granite porphyry reveals that their diagenetic ages are 143.0 Ma±1.2 Ma and 141.4 Ma±1.5 Ma,respectively,representing the age of the deposit formation;the Hf isotopic test of granite porphyry shows that the distribution range of the values is-3.4 to+4.2,with an average of 1.6.It shows that the magma source area is the newborn mafic crust.The Matang gold deposit was formed in the early Cretaceous,controlled by granite porphyry,cryptoexplosive breccia,structures and fractures at all levels,and belongs to the cryptoexplosion breccia type.
引文
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[24]章增凤.隐爆角砾岩的特征及其形成机制[J].地质科技情报,1991(4):1-5.
[2]王书来,樊江.豫西隐爆角砾岩型金矿特征与形成条件[J].矿产勘查,1998(4):203-209.
[3]艾霞,王书来,刘克铭.河南毛堂、蒲塘金矿地质特征及成矿机制探讨[J].矿产勘查,1997(s1):32-38.
[4]冯建忠,王书来,艾霞,等.河南毛堂及蒲塘金矿成矿物理化学条件和流体演化[J].黄金地质,1997(1):17-22.
[5]邓宗立,焦守敬.毛堂金矿黄铁矿形态分析及深部找矿研究[J].成都理工大学学报:自然科学版,1990(3):29-37.
[6]河南省地矿局第四地质调查队.河南省淅川县毛堂矿区Ⅲ号岩体金矿详查报告[R].郑州:河南省地矿局第四地质调查队,1987.
[7]李怀坤,朱士兴,相振群,等.北京延庆高于庄组凝灰岩的锆石U-Pb定年研究及其对华北北部中元古界划分新方案的进一步约束[J].岩石学报,2010,26(7):2131-2140.
[8]耿建珍,李怀坤,张健,等.锆石Hf同位素组成的LA-MC-ICP-MS测定[J].地质通报,2011,30(10):1508-1513.
[9]李长民.锆石成因矿物学与锆石微区定年综述[J].地质调查与研究,2009,32(3):161-174.
[10]Patchett P J,Kouvo O,Hedge C E,Tatsumoto M.Evolution of continental crust and mantle heterogeneity:Evidence from Hf isotopes[J].Contributions to Mineralogy and Petrology,1981,78(3):279-297.
[11]Kinny P D,Maas R.Lu-Hf and Sm-Nd isotope systems in zircon[J].Reviews in Mineralogy and Geochemistry,2003,53(1):327-341.
[12]Knudsen T L,Griffin W L,Hartz E H,Andresen A,Jackson S E.In-situ hafnium and lead isotope analyses of detrital zircons from the Devonian sedimentary basin of NE Greenland:A record of repeated crustal reworking[J].Contributions to Mineralogy and Petrology,2001,141(1):83-94.
[13]吴福元,李献华,郑永飞,等.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,2007,23(2):185-220.
[14]Amelin Y,Lee D C,Halliday A N,Pidgeon R T.Nature of the earth’s earliest crust from hafnium isotopes in single detrial zircons[J].Nature,1999,399:252-255.
[15]Vervoort J D,Patchett P J,Gehrels G E,Nutman A P.Constraints on early Earth differentiation from hafnium andneodymium isotopes[J].Nature,1996,379:624-627.
[16]陈衍景,富士谷,胡受奚.论豫西金矿的成矿时代[J].有色金属矿产与勘查,1992,1(3):140-144.
[17]董国臣,窦录元,任龙,等.秦岭豫西南中生代浅成侵入体及其成矿能力:以浦塘金矿为例[C]∥中国地球科学联合学术年会,2014:2185-2188.
[18]张国伟,孟庆任,于在平,等.秦岭造山带的造山过程及其动力学特征[J].中国科学:地球科学,1996,26(3):193-200.
[19]夏林圻,夏祖春.南秦岭中-晚元古代火山岩性质与前寒武纪大陆裂解[J].中国科学:地球科学,1996(3):237-243.
[20]卢欣祥,于在平,冯有利,等.东秦岭深源浅成型花岗岩的成矿作用及地质构造背景[J].矿床地质,2002,21(2):168-178.
[21]曾威,常云真,司马献章,等.河南省崤山地区中河银多金属矿床花岗斑岩体形成时代及其地质意义[J].地质调查与研究,2017,40(2):81-88.
[22]毛景文,王志良.中国东部大规模成矿时限及其动力学背景的初步探讨[J].矿床地质,2000,19(4):403-405.
[23]张国伟,张宗清,董云鹏.秦岭造山带主要构造岩石地层单元的构造性质及其大地构造意义[J].岩石学报,1995,11(2):101-114.
[24]章增凤.隐爆角砾岩的特征及其形成机制[J].地质科技情报,1991(4):1-5.