收稿日期: 2014-04-26
修回日期: 2014-06-10
网络出版日期: 2014-12-24
Geochemical Study of Tanjianshan Group Metavolcanic Rocks in Shengligou Area and its Relationship with Gold Mineralization
Received date: 2014-04-26
Revised date: 2014-06-10
Online published: 2014-12-24
胜利沟地区位于赛什腾山构造—岩浆岩带南西侧,区内主要出露有上奥陶统滩间山群变质火山岩。地球化学研究表明,火山岩为超基性—基性—中性系列,主要为准铝—低铝质岩类。碱度指数ALK(Na2O+K2O)为2.70%~10.73%。岩石分异指数(DI)普遍较低,稀土总量变化大,ΣREE为25.35×10-6~446.11×10-6,δEu为0.72~1.08,呈弱负铕异常至正异常,显示出火山弧玄武岩或过渡型洋脊玄武岩的特点。火山岩总体上显示偏钠质特点。在区域上偏钠质火山熔岩及其对应的火山碎屑岩为金矿最好的赋矿层位,显示了本区火山岩地层巨大的成矿潜力。
王伟 , 刘文毅 , 何美香 . 青海胜利沟地区滩间山群变质火山岩地球化学特征及其与成矿关系研究[J]. 黄金科学技术, 2014 , 22(4) : 39 -44 . DOI: 10.11872/j.issn.1005-2518.2014.04.039
Shengligou area in Qinghai Province is located in the southwest side of the tectonics and magmatic rocks belt of Saishiteng Mountain region.Moreover,it is found that the ordovician beach on the mountains metamorphic volcanic rocks appear in the region.Overall,the geochemical features show that volcanic rocks belong to the type of ultrabasic-basic-neutral series,and mainly with quasi aluminum-low aluminum rock. Alkalinity index ALK(Na2O+K2O) is approximately 2.70% ~10.73%.Rock differentiation index (DI)displays low value on the whole,but total rare earth change with the ΣREE 25.35×10-6~446.11×10-6,which presents the characteristics of volcanic arc basalt or transitional ridge basalt.Additionally,the volcanic rocks in the study area overall displays partial sodium qualitative characteristics.Partial sodic volcanic lava in the area and its corresponding volcanic clastic rock are best gold ore bearing strata,which indicates that the huge mineralization potential of volcano rock strata in the region.
[1] 魏刚锋.滩间山金矿田韧性剪切带和金矿[J].黄金科学技术,1996,4(1):12-16.
[2] 邱家骧,林景仟.岩石化学[M].北京:地质出版社,1991.
[3] Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,.37(3/4): 215-224.
[4] Rittmann A.火成岩的稳定矿物组合计算方法[M]. 金秉慧,译.北京:地质出版社,1979.
[5] 王中刚,于学元,赵振华,等.稀土元素地球化学[M].北京:科学出版社,1989.
[6] Herrmann A G.Yttrium and lanthanides [M]//Wedepohl K H.Handbook of Geochemistry.VolⅡ.Berlin:Springer,1970:57-71.
[7] 刘昌实,朱金初,沈渭洲,等.华南陆壳改造系列花岗岩类型划分和成岩物质来源[J].地质学报,1990,64(1):43-52.
[8] 王莉娟,彭志刚,祝新友,等.青海省锡铁山Sedex型铅锌矿床成矿床成矿流体来源及演化:流体包裹体及同位素地球化学证据[J].岩石学报,2009,25(11):3007-3015.
[9] 傅星.青海绿梁山地区金矿床地质特征及成矿条件浅析[J].黄金科学技术,2010,18(4):54-57.
[10] 徐克勤,胡受奚,孙明志,等.华南两个成因系列花岗岩及其成矿特征[J].矿床地质,1982,(2):1-14.
[11] 胡祥昭.银岩含锡花岗斑岩的岩石学特征及成因探讨[J].地球化学,1989,(3):251-259.
[12] Irvine T N ,Baragar W R A.A guide to the chemical classification of the common volcanic rocks[J].Canadian Journal of Earth Sciences,1971,8(5):532-548.
/
〈 | 〉 |