攀枝花大田铀矿床年代学特征及其意义
|
摘要
文章以康滇地轴典型热液型铀矿——大田铀矿床为研究对象,开展了围岩、构造蚀变带脉岩中的锆石和矿石晶质铀矿U-Pb法定年,以及年代学特征研究,获得如下认识:1)大田地区混合岩的原岩形成于晚元古代早期之前(>900Ma);2)混合岩化作用发生于840~900Ma;3)铀矿区F3碱性构造蚀变岩带形成于混合岩化晚期(820~840Ma);4)大田铀矿床的成矿年龄为777Ma左右。因此笔者认为,康滇地轴的形成与发展、包括铀在内的成矿作用,是与罗迪尼亚大陆的形成及裂解演化所导致的构造岩浆作用密切相关。大田地区的构造演化对铀成矿具有重要的意义。
The chronology characteristics of Kangdian typical hydrothermal uranium ore(Datian uranium deposits)were studied by dating the U-Pb age of zircon and uraninite in the surrounding rock,dike in structure belt.Through careful dating,recognition was conclude in the follows:1)the original rock of migmatite in Datian area was formed before middle-late proterozoic(earlier than 900Ma);2)the migmatization was formed in 840~900Ma;3)the alkaline alteration belt(F3tectonic belt)in Datian uranium ore area was formed in the late migmatization which was formed in the age of 820~840 Ma;4)Datian uranium mineralization epoch is about 777 Ma.Formation,development of Kangdian geo-axis and uranium mineralization has close relationship with the formation and evolution of Rodinia continental and tectonic magmatic thermal event caused by its cracking.The tectonic evolution of Datian region has important significance on uranium mineralization.
The chronology characteristics of Kangdian typical hydrothermal uranium ore(Datian uranium deposits)were studied by dating the U-Pb age of zircon and uraninite in the surrounding rock,dike in structure belt.Through careful dating,recognition was conclude in the follows:1)the original rock of migmatite in Datian area was formed before middle-late proterozoic(earlier than 900Ma);2)the migmatization was formed in 840~900Ma;3)the alkaline alteration belt(F3tectonic belt)in Datian uranium ore area was formed in the late migmatization which was formed in the age of 820~840 Ma;4)Datian uranium mineralization epoch is about 777 Ma.Formation,development of Kangdian geo-axis and uranium mineralization has close relationship with the formation and evolution of Rodinia continental and tectonic magmatic thermal event caused by its cracking.The tectonic evolution of Datian region has important significance on uranium mineralization.
引文
[1]郭葆墀,钱法荣,等.康滇地轴中南段铀成矿条件分析及远景预测[R].北京:核工业北京地质研究院,1995:l-57.
[2]李巨初,王红军,薛钧月,等.康滇地轴中南段铀矿找矿方向研究[R].成都理工大学,2009.
[3]张成江,陈友良,李巨初,等.康滇地轴巨粒晶质铀矿的发现及其地质意义[J].地质通报,2015,12:2219-2226.
[4]胥德恩.康滇地轴地壳演化与铀成矿作用探讨[J].铀矿地质,1992,8(6):348-354.
[5]李复汉,覃嘉铭,申玉连,等.康滇地区的前震旦系[M].重庆:重庆出版社,1988,20-22,94-100.
[6]李志红,罗照华,陈岳龙,等.康定变质侵入岩的年代学及岩石地球化学特征[J].地球学报,2005,26(B09):87-89.
[7]马玉孝,刘家铎,等.攀枝花地质[M].成都:四川科学技术出版社,2001:178-308.
[8]杜利林,耿元生,杨崇辉,等.扬子地台西缘康定群的再认识——来自地球化学和年代学证据[J].地质学报,2007,81(11):1562-1577.
[9]王红军.攀枝花大田和牟定戌街元古代岩浆岩体地球化学特征及其与铀矿化的关系[D].成都理工大学,2009.
[10]戴杰敏,朱西养.寄希望于康滇地轴——康滇地轴铀矿远景评价研讨会报道[J].铀矿地质,1992,8(3):130-155.
[11]姚建,李巨初,周君,等.攀枝花市大田505地区混合岩成因及其与铀矿化关系初探[A]//全国铀矿大基地建设学术研讨会论文集(上).核工业北京地质研究院,2012:590-598.
[12]李莎莎.四川攀枝花505地区混合岩地球化学特征及其与铀成矿关系[D].成都理工大学,2011.
[13]李巨初、王剑峰、周蓉生,等.康滇地轴中南段铀(金、铜)成矿条件研究[R].成都理工大学,1994.
[14]姚建.攀枝花市大田地区混合岩成因研究[D].成都理工大学,2014.
[15]胥德恩,陈友良,张应全,等.康定杂岩时代及成因探讨[J].地质评论,41(2):101-111.
[16]Hoffman P F.Did the breakup of Laurentia turn Gondwana inside out[J].Science,1991,252:1 409-1 412.
[17]陆松年,李怀坤,陈志宏,等.新元古时期中国古大陆与罗迪尼亚超大陆的关系[J].地学前缘,2004,11(2):515-523.
[18]王江海.元古宙罗迪尼亚泛大陆的重建研究[J].地学前缘,1998,5(4):235-243.
[2]李巨初,王红军,薛钧月,等.康滇地轴中南段铀矿找矿方向研究[R].成都理工大学,2009.
[3]张成江,陈友良,李巨初,等.康滇地轴巨粒晶质铀矿的发现及其地质意义[J].地质通报,2015,12:2219-2226.
[4]胥德恩.康滇地轴地壳演化与铀成矿作用探讨[J].铀矿地质,1992,8(6):348-354.
[5]李复汉,覃嘉铭,申玉连,等.康滇地区的前震旦系[M].重庆:重庆出版社,1988,20-22,94-100.
[6]李志红,罗照华,陈岳龙,等.康定变质侵入岩的年代学及岩石地球化学特征[J].地球学报,2005,26(B09):87-89.
[7]马玉孝,刘家铎,等.攀枝花地质[M].成都:四川科学技术出版社,2001:178-308.
[8]杜利林,耿元生,杨崇辉,等.扬子地台西缘康定群的再认识——来自地球化学和年代学证据[J].地质学报,2007,81(11):1562-1577.
[9]王红军.攀枝花大田和牟定戌街元古代岩浆岩体地球化学特征及其与铀矿化的关系[D].成都理工大学,2009.
[10]戴杰敏,朱西养.寄希望于康滇地轴——康滇地轴铀矿远景评价研讨会报道[J].铀矿地质,1992,8(3):130-155.
[11]姚建,李巨初,周君,等.攀枝花市大田505地区混合岩成因及其与铀矿化关系初探[A]//全国铀矿大基地建设学术研讨会论文集(上).核工业北京地质研究院,2012:590-598.
[12]李莎莎.四川攀枝花505地区混合岩地球化学特征及其与铀成矿关系[D].成都理工大学,2011.
[13]李巨初、王剑峰、周蓉生,等.康滇地轴中南段铀(金、铜)成矿条件研究[R].成都理工大学,1994.
[14]姚建.攀枝花市大田地区混合岩成因研究[D].成都理工大学,2014.
[15]胥德恩,陈友良,张应全,等.康定杂岩时代及成因探讨[J].地质评论,41(2):101-111.
[16]Hoffman P F.Did the breakup of Laurentia turn Gondwana inside out[J].Science,1991,252:1 409-1 412.
[17]陆松年,李怀坤,陈志宏,等.新元古时期中国古大陆与罗迪尼亚超大陆的关系[J].地学前缘,2004,11(2):515-523.
[18]王江海.元古宙罗迪尼亚泛大陆的重建研究[J].地学前缘,1998,5(4):235-243.