梅田矿区岩浆热变煤中微量元素分布特征  

Distribution of minor and trace elements in magmatic hydrothermal metamorphic coal of Meitian Coal Mine, Hunan Province

作　　者：王运泉[1] 莫洁云[1] 任德贻[2] 

机构地区：[1]广州师范学院地理系,广州510400 [2]中国矿业大学北京研究生部,北京100083

出　　处：《地球化学》1999年第3期289-296,共8页Geochimica

基　　金：国家自然科学基金!(编号:49372124) ;广州市自然科学基金!( 编号:96J2)

摘　　要：梅田矿区主采煤层———龙谭组１２ 号煤层主要是受矿区北部骑田岭花岗岩侵入体影响的典型岩浆热液变质无烟煤，煤的变质指标如挥发分（Ｖｄａｆ）和镜质组反射率Ｒｏ（ｍａｘ）等与岩体有密切关系。本次研究按距离岩体由近而远采集了一系列煤样，运用中子活化（ＩＮＡＡ）和微区分析等测试手段研究了样品中近４０ 种微量元素的分布特征，结果表明：（１）Ａｓ、Ｃｄ 、Ｈｇ 、Ｐｂ、Ｓｅ 等对人体有毒元素在煤中的质量分数较地壳克拉克值高数倍至数十倍，灰基质量分数则高数十至数百倍；（２） 绝大多数元素的灰基质量分数较植物灰和粘土＋ 板岩样中的质量分数高；（３）Ｃｅ、Ｃｒ、Ｅｕ、Ｈｆ、Ｋ、Ｌａ、Ｌｕ 、Ｎａ、Ｎｄ 、Ｎｉ、Ｒｂ 、Ｓｃ、Ｔｈ 、Ｕ、Ｗ、Ｙｂ 等元素的质量分数随离岩体距离的增大而有逐渐降低的趋势，而Ｃｄ、Ｃｕ 、Ｈｇ、Ｐｂ、Ｓｂ、Ｓｅ 等元素则逐渐增高。微量元素的这种分布特征与岩浆热液作用的阶段性有密切关系。No.12 coal seam in Longtan Formation,main mineable one in Meitian coal mine is magmatic hydrothermal metamorphic anthracite mainly affected by Qitianling granite intrusive of north coal mine. Metamorphic indexes of coal, such as Vdaf and Ro(max) have close relation to the granite intrusive. Thirty nine elements in 10 coal samples taken from No.12 coal seam have been analyzed using INAA (instrumental neutron activation analysis) and microarea analysis. The results show that: (1) the contents of some toxic elements, such as As,Cd,Hg,Pb,Se, are several to ten times higher than the clarke, while at ash basis are ten to several hundred times higher; (2) the contents of most elements at ash basis are higher than those in plant ash or clay slate; (3) Ce,Cr,Eu,Hf,K,La,Lu,Na,Nd,Ni,Rb,Sc,Th,U,W,Yb decrease with increasing the distance from the instrusive,while Cd,Cu,Hg,Pb,Sb and Se increase. The distribution of elements in coal is related to the magmatic hydrothermalism.

关 键 词：煤 微量元素 分布特征 岩浆热液作用 煤矿床 

分 类 号：P618.110.5[天文地球—矿床学] P618.110.6[天文地球—地质学]