北淮阳东段张冲闪长玢岩地球化学特征、LA-ICP-MS锆石U-Pb年龄及其地质意义
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摘要
张冲闪长玢岩呈不规则状侵入佛子岭岩群诸佛庵岩组和毛坦厂组中。岩体具较高的SiO_2和Al_2O_3含量,为偏碱性、准铝质、高钾钙碱性系列岩石。富集大离子亲石元素(LILE)和轻稀土元素(LREE),亏损高场强元素(HFSE)、重稀土(HREE)和Y,无明显Eu异常,Sr正异常。通过LA-ICP-MS锆石U-Pb法确定张冲闪长玢岩年龄为129±3 Ma,表明该岩体侵位于早白垩世。通过对岩石主、微量元素特征研究,认为岩浆可能来源于底侵玄武岩,并受到地壳物质的混染。岩体形成于中生代构造体制转换期,可能属于北淮阳东段中生代第一旋回侵入岩。
The Zhangchong diorite porphyrite intruded into the Zhufo'an Formation and Maotanchang Formation of the Foziling Group. The diorite porphyries have high SiO_2 and Al_2O_3 contents, and belong to metaluminous, high K Calc-alkalic series. The rocks are enriched in large ion lithophile elements and depleted in high field strength elements, showing positive Sr anomalies and insignificant Eu anomalies. LA-ICP-MS U-Pb dating of zircon from the Zhangchong diorite porphyrite yields an age of 129±3 Ma. Regarding the major and trace element geochemistry of the rocks, we suggest that the magma was derived from underplated basalt with crustal contamination. The pluton belongs to the first phase of Mesozoic magmatism in the eastern North Huaiyang emplaced under a tectonic transition of compression to extension in Late Jurassic to Early Cretaceous.
The Zhangchong diorite porphyrite intruded into the Zhufo'an Formation and Maotanchang Formation of the Foziling Group. The diorite porphyries have high SiO_2 and Al_2O_3 contents, and belong to metaluminous, high K Calc-alkalic series. The rocks are enriched in large ion lithophile elements and depleted in high field strength elements, showing positive Sr anomalies and insignificant Eu anomalies. LA-ICP-MS U-Pb dating of zircon from the Zhangchong diorite porphyrite yields an age of 129±3 Ma. Regarding the major and trace element geochemistry of the rocks, we suggest that the magma was derived from underplated basalt with crustal contamination. The pluton belongs to the first phase of Mesozoic magmatism in the eastern North Huaiyang emplaced under a tectonic transition of compression to extension in Late Jurassic to Early Cretaceous.
引文
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杜建国,张鹏,姜俊峰.1996.安徽北淮阳地区构造岩相带的划分与对比.安徽地质,6(1):19-27.
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段留安,杨晓勇,刘晓明,孙卫东.2013.铜陵舒家店地区志留纪地层中金矿的发现及其意义.大地构造与成矿学,37(2):333-339.
黄国成,王登红,吴小勇.2012.浙江临安千亩田钨铍矿区花岗岩锆石LA-ICP-MS U-Pb年龄及对区域找矿的意义.大地构造与成矿学,36(3):392-398.
黄皓,薛怀民.2012.北淮阳早白垩世金刚台组火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义.岩石矿物学杂志,31(3):371-381.
黄皓.2012.北淮阳白垩纪火山岩的年代学和地球化学研究.北京:中国地质大学(北京)硕士学位论文:36-41.
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李毅,李诺,杨永飞,王玭,糜梅,张静,陈红瑾,陈衍景.2013.大别山北麓钼矿床地质特征和地球动力学背景.岩石学报,29(1):95-106.
陆三明,彭海辉,盛中烈.2002.北淮阳构造带东段铅锌矿找矿远景.安徽地质,12(2):114-119.
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潘国强,陆现彩,于航波.2001.北淮阳中生代adakite岩石地球化学特征及成因讨论.岩石学报,17(4):541-550.
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王登红,陈郑辉,黄国成,武国忠,陈芳.2012.华南“南钨北扩”、“东钨西扩”及其找矿方向探讨.大地构造与成矿学,36(3):322-329.
王根节,张怀东,项斌,王波华,郝越进.2010.北淮阳构造带东段中生代岩浆活动与多金属成矿作用.安徽地质,20(4):267-272.
王世伟,周涛发,袁峰,范裕,吕玉琢.2011.铜陵舒家店岩体的年代学和地球化学特征研究.地质学报,85(5):849-861.
王运,陈衍景,马宏卫,徐友灵.2009.河南省商城县汤家坪钼矿床地质和流体包裹体研究.岩石学报,25(2):468-480.
魏庆国,高昕宇,赵太平,陈伟,杨岳衡.2010.大别北麓汤家坪花岗斑岩锆石LA-ICPMS U-Pb定年和岩石地球化学特征及其对岩石成因的制约.岩石学报,26(5):1550-1562.
吴元保,郑永飞.2004.锆石成因矿物学研究及其对U-Pb年龄解释的制约.科学通报,49(16):1589-1604.
徐晓春,楼金伟,陆三明,谢巧勤,褚平利,尹滔.2009.安徽金寨银山钼-铅-锌多金属矿床Re-Os和有关岩浆岩40Ar-39Ar年龄测定.矿床地质,28(5):621-632.
徐志刚,陈毓川,王登红,陈郑辉,李厚明.2008.中国成矿区带划分方案.北京:地质出版社:133-135.
杨泽强.2007.河南商场县汤家坪钼矿辉钼矿铼-锇同位素年龄及地质意义.矿床地质,26(3):289-295.
杨祝良,沈加林,沈渭洲,陶奎元,谢芳贵.1999.北淮阳中生代火山-侵入岩同位素年代学研究.地质论评,45(增刊):674-680.
张超,马昌前,Francois HOLTZ.2012.含水大陆下地壳的部分熔融:大别山C型埃达克岩成因探讨.高校地质学报,18(1):41-51.
张红,孙卫东,杨晓勇,梁华英,王波华,王瑞龙,王玉贤.2011.大别造山带沙坪沟特大型斑岩钼矿床年代学及成矿机理研究.地质学报,85(12):2039-2059.
张怀东,史东方,郝越进,王波华.2010b.安徽省金寨县沙坪沟斑岩型钼矿成矿地质特征.安徽地质,20(2):104-108.
张怀东,王波华,郝越进,程松,项斌.2012.安徽沙坪沟斑岩型钼矿床地质特征及综合找矿信息.矿床地质,31(1):41-51.
张怀东,王根节,史东方.2010a.安徽省金寨县沙坪沟斑岩型钼矿床成矿条件及找矿方向初探.上海地质,31(增刊):203-205.
张鹏.1998.北淮阳地区中生代火山活动及其构造背景.安徽地质,8(3):10-15.
周涛发,范裕,袁峰,钟国雄.2012.长江中下游成矿带地质与矿产研究进展.岩石学报,28(10):3051-3066.
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