| 赵国斌.内蒙盘陀山含钨花岗岩体地质地球化学
特征及成因讨论[J].地质与勘探,2011,47(5):828-836 |
| 内蒙盘陀山含钨花岗岩体地质地球化学
特征及成因讨论 |
| Geological and Geochemical Characteristics of the Pantuoshan Tungsten-BearingGranite Mass in Inner Mongolia and Its Genesis |
| 投稿时间：2010-10-18 修订日期：2011-03-06 |
| DOI： |
| 中文关键词: 盘陀山花岗岩 成矿特征 地球化学特征 成因机制 内蒙北山 |
| 英文关键词: Pantuoshan granite,metallogenic features,geological and geochemical characteristics,genetic mechanism,Beishan Mountains,Inner Mongolia |
| 基金项目:国家专项“北山成矿带找矿重大疑难问题研究冶项目(1212010531602)、内蒙古自治区“内蒙古额济纳旗国庆钨矿普查冶项目
(05-6-KC3)和国家专项“北山-祁连成矿带勘查部署与选区研究冶项目(1212011085083)资助 |
|
| 摘要点击次数: 2498 |
| 全文下载次数: 1626 |
| 中文摘要: |
| [摘要]盘陀山花岗岩体位于内蒙北山盘陀山—古硐井近东西向挤压隆起带西段,为一复式岩体,由花岗闪长岩和钾长花岗岩两种岩石单元构成,其中晚期侵入的钾长花岗岩与近年新发现的国庆钨矿床有关。前人测得成矿岩体的锆石U-Pb 同位素年龄为383.3±1.8 Ma,时代为泥盆纪。成矿岩体岩石的Rittman 指数为1.86~2.28,A/ CNK 平均值为1.12,属过铝质高钾钙碱性花岗岩。岩石的LaN/YbN值为1.90~7.63,δEu 值为0.09 ~ 0.63,Nb/ Ta 值为1.07 ~ 10.77,Rb/ Sr 值为0.41 ~ 5.34,说明岩浆来源于地壳,具有明显的重熔型花岗岩特征。作者研究认为,在早古生代该区属白玉山—方山口—鹰嘴红山被动陆缘带,到泥盆纪本区进入板块碰撞造山阶段,动力转化为热量,前寒武纪古陆壳发生部分重熔,生成了含钨花岗岩浆。岩体的成矿作用主要有两个阶段:第一阶段,岩浆上侵后,挥发份携带部分成矿元素向顶边部运移,并在岩体内接触带聚集,形成了顶边部接触带型钨矿体群;第二阶段,随着岩体由边部向内部结晶,残余岩浆中挥发分及成矿元素逐步富集,最终在成矿岩体中部形成了石英细脉带型钨矿体群。 |
| 英文摘要: |
| Abstract:Located in the western Pantuoshan-Gudongjing compressional uplift zone,the Beishan Mountains in Inner Mongolia,the Pantuoshan granite body is a complex intrusion comprised of granodiorite and K-feldspar granite. The recently discovered Guoqing tungsten deposit is associated with the late intrusive K-feldspar granite. Previous studies suggest that the zircon U-Pb age is 383. 3±1. 8 Ma,and it was formed in the Devonian. The Rittman index of the granite related to the mineralization is 1. 86~2. 28,and the average A / CNK is 1. 12,indicating it belongs to high-K peraluminous and calc-alk line series granite. These rocks have LaN/YbN,Nb/Ta,δEu and Rb/ Sr as 1.90~7.63,0.09~0. 63,1.07 ~10.77 and 0.41~5.34,respectively,interpreted to reflect its derivation from crust re-melting. We consider that this area belonged to the Baiyushan-Fangshankou Yingzuihongshan passive continental margin zone in the early Paleozoic. In the Devonian,this region was in the plate collision orogenic stage,and power was converted into heat,whichresulted in the partially re-melted pre-Cambrian ancient continental crust,and the later tungsten-bearing granitic magma.The mineralization of Pantuoshan granite bodies can be divided into two periods. In the first period,the volatile component which carried some ore-forming elements moved to the top edge of magma and accumulated in its inner contact zones,then the contact zone-type tungsten ore bodies were formed. In the second period,with the rock mass crystallizing from the magma edge to inside,the volatile and ore-forming elements in the residual magma became enriched gradually,and then formed quartz fine-disseminated type tungsten ore bodies in the middle of the metallogenic granite body. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
