秦岭光石沟花岗伟晶岩脉地球化学特征及其成因
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摘要
北秦岭光石沟地区含矿伟晶岩的成因问题,对于认识该区域铀成矿规律具有重要的指示作用。过去人们根据铀矿体的产出地质特征和与灰池子岩体的空间展布关系,普遍认为赋矿的花岗伟晶岩脉源自于灰池子岩体残余岩浆的分异作用。随着研究方法和测试技术的日渐成熟,专家学者们发现该区的花岗伟晶岩脉地球化学特征脱离了灰池子岩体的演化序列,暗示其物质来源另有途径。因此,笔者将区内的花岗伟晶岩脉以铀含量为标准分为含矿和非含矿两类,分别与秦岭群片麻岩和灰池子岩体进行对比分析研究,结果清晰表明,非含矿岩脉为灰池子岩体残余岩浆分异结晶所产生,而含矿岩脉则倾向于秦岭群片麻岩的部分重熔成因。这说明该地区伟晶岩脉具有多成因性,表现出复杂的多源特征。
Origin of the ore-bearing pegmatites in the Guangshigou area of the North Qinling orogeny is important to the instruction of the regional uranium mineralization. In the past, it was generally believed that the granitic pegmatite dikes were derived from the residual magma differentiation of the Huichizi pluton.With the growing maturity of testing techniques, more and more research result have revealed that the geochemical characteristics of the granitic pegmatite dikes in this area were separated from the evolutionary sequence of the Huichizi pluton which suggest that the source of the granitic granodiorite may be from the other rocks.The granite pegmatite dikes in the area can be divided into two categories: ore-bearing and non-ore-bearing according to the uranium content. By comparing with the gneiss of Qinling group and Huichizi pluton respectively, the non-ore-bearing dikes were found clearly be produced by the residual magma crystallization of the Huichizi puton, while the ore-bearing dikes tend to be the products of partially remelting of Qinling group, which means that the pegmatite dikes in the area were multi-genetic and of multi-source.
Origin of the ore-bearing pegmatites in the Guangshigou area of the North Qinling orogeny is important to the instruction of the regional uranium mineralization. In the past, it was generally believed that the granitic pegmatite dikes were derived from the residual magma differentiation of the Huichizi pluton.With the growing maturity of testing techniques, more and more research result have revealed that the geochemical characteristics of the granitic pegmatite dikes in this area were separated from the evolutionary sequence of the Huichizi pluton which suggest that the source of the granitic granodiorite may be from the other rocks.The granite pegmatite dikes in the area can be divided into two categories: ore-bearing and non-ore-bearing according to the uranium content. By comparing with the gneiss of Qinling group and Huichizi pluton respectively, the non-ore-bearing dikes were found clearly be produced by the residual magma crystallization of the Huichizi puton, while the ore-bearing dikes tend to be the products of partially remelting of Qinling group, which means that the pegmatite dikes in the area were multi-genetic and of multi-source.
引文
[1]彭大明.秦岭铀资源研究[J].铀矿地质,1999,15(3):22-33.
[2]万吉,高立宝,王莲香.商丹三角区花岗伟晶岩型成矿环境研究及远景评价[J].铀矿地质,1992,8(5):257-263.
[3]孙远强,范洪海,何德宝,等.丹凤矿田伟晶岩型铀矿找矿潜力评价[J].铀矿地质,2012,28(4):222-226.
[4]左文乾,沙亚洲,陈冰,等.丹凤地区光石沟铀矿床大毛沟岩株锆石U-Pb同位素定年及其地质意义[J].铀矿地质,2010,26(4):222-227.
[5]陕西省核工业地质局224大队.灰池子岩体东南部岩体脉体特征及找矿预测研究[R].西安:陕西省核工业地质局,2014,1-21.
[6]朱焕巧,李卫红,惠争卜,等.陕西丹凤三角地区花岗伟晶岩铀-稀有元素矿化特征及成矿作用分析[J].西北地质,2015,48(1):172-178.
[7]冯张生,张夏涛,焦金荣,等.陕西省丹凤地区花岗伟晶岩型铀矿特征及找矿方向[J].西北地质,2013,46(2):159-166.
[8]沙亚洲,左文乾,张展适,等.陕西秦岭光石沟铀矿床含矿与非含矿伟晶岩差异性及其研究意义[J].东华理工大学学报(自然科学版),2011,34(3):215-223.
[9]陈佑纬,毕献武,胡瑞忠,等.陕南光石沟伟晶岩型铀矿床黑云母矿物化学研究及其对铀成矿的启示[J].矿物岩石,2013,33(4):17-28.
[10]冯明月,戎嘉树,孙志富,等.北秦岭伟晶岩铀矿[M].北京:原子能出版社,1996:121-126.
[11]曾令交,金景福.光石沟花岗伟晶岩的成岩物质来源和形成方式定量模拟[J].西北地质,1994,15(4):16-20.
[12]陈西京.论东秦岭某地花岗伟晶岩的分布规律[J].地球科学与环境学报,1982,1(10):16-25.
[13]张维吉,王庆全,胡熊高,等.东秦岭地质走廊研究[M].西安:陕西科技出版社,1996.
[14]张宗清,张国伟,刘敦一.秦岭造山带蛇绿岩、花岗岩和碎屑沉积岩同位素年代学和地球化学[M].北京:地质出版社,2006.
[15]张寿广,万渝生,刘国惠,等.北秦岭宽坪群变质地质[M].北京:科学技术出版社,1991:121-126.
[16]Wang Tao,Wang Xiaxia,Li Wuping.Evaluation of multiple emplacement mechanisms:the Huichizi granite pluton,Qinling orogenic belt,central China[J].Journal of Structural Geology,2000,22:505-518.
[17]Taylor S R and Mc Clennan S.The continental crust:composition and evolution[J].Blackwell scientific publications,1985,54,209-230,372.
[18]王涛,王晓霞,田伟,等.北秦岭古生代花岗岩组合、岩浆时空演变及其对造山作用的启示[J].中国科学D辑:地球科学,2009,39(7):949-971.
[19]谢红接.花岗伟晶岩型铀矿地球化学特征、成岩成矿机理研究[D].核工业北京地质研究院,1993.
[20]裴小利,时毓,刘希军,等.北秦岭地体秦岭岩群中斜长角闪岩的年代学特征[J].矿物学报,2015,S1:534-535.
[21]戎嘉树,冯明月,孙志富,等.北秦岭伟晶岩脉群区域分带及铀成矿[J].地学研究,1997,29-30.
[22]朱富社,杨安林,卞利.商南光石沟铀矿床花岗岩、伟晶岩同位素年龄及其地质内涵[J].地下水,2014,36(4):187-189.
[23]张国伟,张本仁,袁学诚.秦岭造山带与大陆动力学[M].北京:科学出版社,2001:1-855.
[24]Lothar R,Bradley H,Andrew C,et al.Tectonics of the Qinling(Central China):tectonostratigraphy,geochronology,and deformation history[J].Tectonophysics,2003,366(1):1-53.
[25]裴先治,王涛,丁仁平,等.东秦岭商丹带北侧新元古代埃达克质花岗岩及其地质意义[J].中国地质,2003,30(4):372-381.
[26]袁学诚,李善芳,华九如.秦岭陆内造山带岩石圈结构[J].中国地质,2008,35(1):1-15.
[27]李庆阳,蔡惠蓉,陈彦.地热场与深部铀矿的关系研究及应用[J].中国地质,2010,37(1):198-203.
[2]万吉,高立宝,王莲香.商丹三角区花岗伟晶岩型成矿环境研究及远景评价[J].铀矿地质,1992,8(5):257-263.
[3]孙远强,范洪海,何德宝,等.丹凤矿田伟晶岩型铀矿找矿潜力评价[J].铀矿地质,2012,28(4):222-226.
[4]左文乾,沙亚洲,陈冰,等.丹凤地区光石沟铀矿床大毛沟岩株锆石U-Pb同位素定年及其地质意义[J].铀矿地质,2010,26(4):222-227.
[5]陕西省核工业地质局224大队.灰池子岩体东南部岩体脉体特征及找矿预测研究[R].西安:陕西省核工业地质局,2014,1-21.
[6]朱焕巧,李卫红,惠争卜,等.陕西丹凤三角地区花岗伟晶岩铀-稀有元素矿化特征及成矿作用分析[J].西北地质,2015,48(1):172-178.
[7]冯张生,张夏涛,焦金荣,等.陕西省丹凤地区花岗伟晶岩型铀矿特征及找矿方向[J].西北地质,2013,46(2):159-166.
[8]沙亚洲,左文乾,张展适,等.陕西秦岭光石沟铀矿床含矿与非含矿伟晶岩差异性及其研究意义[J].东华理工大学学报(自然科学版),2011,34(3):215-223.
[9]陈佑纬,毕献武,胡瑞忠,等.陕南光石沟伟晶岩型铀矿床黑云母矿物化学研究及其对铀成矿的启示[J].矿物岩石,2013,33(4):17-28.
[10]冯明月,戎嘉树,孙志富,等.北秦岭伟晶岩铀矿[M].北京:原子能出版社,1996:121-126.
[11]曾令交,金景福.光石沟花岗伟晶岩的成岩物质来源和形成方式定量模拟[J].西北地质,1994,15(4):16-20.
[12]陈西京.论东秦岭某地花岗伟晶岩的分布规律[J].地球科学与环境学报,1982,1(10):16-25.
[13]张维吉,王庆全,胡熊高,等.东秦岭地质走廊研究[M].西安:陕西科技出版社,1996.
[14]张宗清,张国伟,刘敦一.秦岭造山带蛇绿岩、花岗岩和碎屑沉积岩同位素年代学和地球化学[M].北京:地质出版社,2006.
[15]张寿广,万渝生,刘国惠,等.北秦岭宽坪群变质地质[M].北京:科学技术出版社,1991:121-126.
[16]Wang Tao,Wang Xiaxia,Li Wuping.Evaluation of multiple emplacement mechanisms:the Huichizi granite pluton,Qinling orogenic belt,central China[J].Journal of Structural Geology,2000,22:505-518.
[17]Taylor S R and Mc Clennan S.The continental crust:composition and evolution[J].Blackwell scientific publications,1985,54,209-230,372.
[18]王涛,王晓霞,田伟,等.北秦岭古生代花岗岩组合、岩浆时空演变及其对造山作用的启示[J].中国科学D辑:地球科学,2009,39(7):949-971.
[19]谢红接.花岗伟晶岩型铀矿地球化学特征、成岩成矿机理研究[D].核工业北京地质研究院,1993.
[20]裴小利,时毓,刘希军,等.北秦岭地体秦岭岩群中斜长角闪岩的年代学特征[J].矿物学报,2015,S1:534-535.
[21]戎嘉树,冯明月,孙志富,等.北秦岭伟晶岩脉群区域分带及铀成矿[J].地学研究,1997,29-30.
[22]朱富社,杨安林,卞利.商南光石沟铀矿床花岗岩、伟晶岩同位素年龄及其地质内涵[J].地下水,2014,36(4):187-189.
[23]张国伟,张本仁,袁学诚.秦岭造山带与大陆动力学[M].北京:科学出版社,2001:1-855.
[24]Lothar R,Bradley H,Andrew C,et al.Tectonics of the Qinling(Central China):tectonostratigraphy,geochronology,and deformation history[J].Tectonophysics,2003,366(1):1-53.
[25]裴先治,王涛,丁仁平,等.东秦岭商丹带北侧新元古代埃达克质花岗岩及其地质意义[J].中国地质,2003,30(4):372-381.
[26]袁学诚,李善芳,华九如.秦岭陆内造山带岩石圈结构[J].中国地质,2008,35(1):1-15.
[27]李庆阳,蔡惠蓉,陈彦.地热场与深部铀矿的关系研究及应用[J].中国地质,2010,37(1):198-203.