中国东部铀成矿带中酸性岩与全球A型花岗岩对比
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摘要
中国东部铀成矿带中酸性岩广泛发育,前人对中国东部和铀矿有关的中酸性岩进行了广泛的研究,取得了许多成果,推动了中酸性岩和铀矿找矿的进步。本文尝试应用大数据方法对比中国东部铀成矿带中酸性岩与全球A型花岗岩的地球化学特征,主要采用不同元素比值对来考察它们之间的区别,得出72个元素对,做出2556个图解,从中优选出12个图解,获得了比较好的效果。研究表明,中国东部铀成矿带中酸性岩与全球A型花岗岩具有大体一致的地球化学特征;在许多判别图中,中国东部铀成矿带中酸性岩位于全球A型花岗岩范围之内,且主要位于全球A型花岗岩的一侧,说明它们之间既有共性又有差异性。差异主要体现在中国东部铀成矿带中酸性岩更加亏损Co、Ni、Cu、Nb、Ta和富集P_2O_5、Sr、Sc、Pb的特征上。本文公布的判别图说明,落在中国东部铀成矿带中酸性岩范围之外的花岗岩是与铀矿无关的;落在中国东部铀成矿带中酸性岩范围内的可能与铀矿有关,也可能与铀矿无关;但是,与铀矿有关的花岗岩一定落在中国东部铀成矿带中酸性岩范围内。上述结论是初步的,需要在实践中进一步检验。
The intermediate-acid rocks associated with uranium mineralization are widely developed in Eastern China.Many researchers have extensively studied and reached great results, which promotes the progress on origin of intermediate-acid rocks and uranium prospecting. This paper compare such intermediate-acid rocks with global A-type granite by big data. By using element pairs to inspect the differences between them,we have got 72 element pairs and 2556 diagrams. 12 diagrams of them show good discrimination. Results show that intermediate-acid rocks associated with uranium mineralization in Eastern China have geochemical features similar as global A-type granite. In many discrimination plots,the intermediate-acid rocks in Eastern China fall into the field of the global A-type granite. In addition,they mainly concentrate in one part of the area of global A-type granite,suggesting that these two have slight differences. Compared with global A-type granites,the intermediate-acid rocks associated with uranium mineralization in Eastern China are depleted in Co,Ni,Cu,Nb and enriched in P2 O5,Sr,Sc,Pb. Although granite with compositions similar as intermediate-acid rocks associated with uranium mineralization in Eastern China might have not experience uranium mineralization,all granites plot out of the range of intermediate-acid rocks are not uranium mineralized. Such conclusions are preliminary and need to be further evaluated in practice.
The intermediate-acid rocks associated with uranium mineralization are widely developed in Eastern China.Many researchers have extensively studied and reached great results, which promotes the progress on origin of intermediate-acid rocks and uranium prospecting. This paper compare such intermediate-acid rocks with global A-type granite by big data. By using element pairs to inspect the differences between them,we have got 72 element pairs and 2556 diagrams. 12 diagrams of them show good discrimination. Results show that intermediate-acid rocks associated with uranium mineralization in Eastern China have geochemical features similar as global A-type granite. In many discrimination plots,the intermediate-acid rocks in Eastern China fall into the field of the global A-type granite. In addition,they mainly concentrate in one part of the area of global A-type granite,suggesting that these two have slight differences. Compared with global A-type granites,the intermediate-acid rocks associated with uranium mineralization in Eastern China are depleted in Co,Ni,Cu,Nb and enriched in P2 O5,Sr,Sc,Pb. Although granite with compositions similar as intermediate-acid rocks associated with uranium mineralization in Eastern China might have not experience uranium mineralization,all granites plot out of the range of intermediate-acid rocks are not uranium mineralized. Such conclusions are preliminary and need to be further evaluated in practice.
引文
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陈正乐,王永,周永贵,韩凤彬,王平安,宫红良,邵飞,唐湘生,徐金山.2013.江西相山火山-侵入杂岩体锆石SHRIMP定年及其地质意义.中国地质,40(1):217-231
邓平,任纪舜,凌洪飞,沈渭洲,孙立强,朱捌,谭正中.2012.诸广山南体印支期花岗岩的SHRIMP锆石U-Pb年龄及其构造意义.科学通报,57(14):1231-1241
丁辉,巫建华,祝洪涛,吴仁贵,余达淦.2016.大兴安岭南部红山子盆地花岗斑岩SHRIMP锆石U-Pb年龄、地球化学特征及其地质意义.东华理工大学学报(自然科学版),39(1):1-9
董晨阳,赵葵东,蒋少涌,陈卫锋,陈培荣,凌鸿飞,杨水源.2010.赣南白面石铀矿区花岗岩的锆石年代学、地球化学及成因研究.高校地质学报,16(2):149-160
黄国龙,曹豪杰,凌洪飞,沈渭洲,王小冬,伏顺成.2012.粤北油洞岩体SHRIMP锆石U-Pb年龄、地球化学特征及其成因研究.地质学报,86(4):577-586
黄国龙,刘鑫扬,孙立强,李钟枢,张世佳.2014.粤北长江岩体的锆石U-Pb定年、地球化学特征及其成因研究.地质学报,88(5):836-849
冀春雨,巫建华.2010.江西南部余田群长英质火山岩SHRIMP锆石U-Pb年龄及其地质意义.东华理工大学学报(自然科学版),33(2):131-138
孔兴功,陈培荣,章邦桐.2000.江西南部白面石-东坑盆地A型火山岩的确定及地质意义.地球化学,29(6):521-524
兰鸿锋,凌洪飞,孙立强,王凯兴,欧阳平宁,刘建伟,王洪作.2016.诸广山南体桃金洞花岗岩成因和铀成矿潜力探讨.高校地质学报,22(1):12-29
劳玉军,巫建华,徐勋胜.2016.粤北长塘盆地晚白垩世早期流纹岩的成因:地球化学和Sr-Nd-Pb-Hf-O同位素制约.岩矿测试,35(5):558-567
黎伟,祝洪涛,巫建华,吴仁贵,张海龙,赵博,王常东.2017.内蒙古红山子-广兴铀矿田控矿因素探讨和找矿靶区优选.东华理工大学学报(自然科学版),40(2):115-125
李学龙,龚海刚.2015.大数据系统综述.中国科学:信息科学,45(1):1-44
李妩巍,王敢,陈卫锋,赵葵东.2010.香草坪花岗岩体年代学和地球化学特征.铀矿地质,26(4):215-221,227
彭啟辉.2015.赤峰下马架-刘家营子流纹岩年代学与地球化学特征.硕士学位论文.南昌:东华理工大学
任海涛,吴俊奇,叶锡芳,凌洪飞,陈培荣.2013.江西富城岩体西部过铝质细粒花岗岩锆石U-Pb年龄和地球化学特征.高校地质学报,19(2):327-345
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