郭家埠地区位于招平断裂中段，该地区围岩蚀变发育，蚀变分带明显。选取切穿该区蚀变带的1012剖面，分析其围岩蚀变特征，自断裂中心向两侧蚀变岩依次为：黄铁绢英岩、绢英岩和钾化花岗岩，蚀变强度依次减弱。蚀变岩地球化学分析显示：随着蚀变的增强， Si、K、Fe增加， Na减少，说明蚀变是一种硅化、钾化、而去Na的过程；稀土元素总量整体呈降低的趋势。钾化花岗岩轻重稀土元素分异程度较强，轻稀土相对富集，而绢英岩重稀土富集；Rb、Ba含量总体随着矿化强度的增强而增加，高场强元素含量在钾化蚀变阶段和黄铁绢英岩化阶段减少，在绢英岩化阶段增加。通过探讨蚀变岩与找矿的关系，认为黄铁矿化、绢云母化、钾长石化等蚀变是找矿的直接标志。郭家埠地区蚀变岩带规模大，蚀变强，钻孔资料表明深部蚀变岩Au含量已达边界品位，加之周边地区成矿条件较好，初步推测郭家埠地区成矿前景良好。
GuoJiabu District is located in the middle of Zhao-Ping fracture,where wall rock alteration develops well and the alteration zone is obvious.In this paper,Section 1012 cutting through the alteration zone is selected to an-alyze the rock alteration characteristics.From the center of the fracture to the two sides,the altered rock belt follows:pyrite sericite quartzite,sericite quartzite and K-feldspathized granite and the intensity of the alteration decreases in turn.The geochemical analysis of the altered rocks indicates that with the intensity of the alteration strengthening,Si, K,Fe increase and Na reduces,showing it is a Si,K alteration process while Na is removed;∑REE increases.The dif-ferentiation degree of heavy and light REE is stronger in K-feldspathized granite,light REE relatively enriched,and sericite quartzite enriching the heavy REE;with the mineralization intensity strengthening,the contents of Rb,Ba ele-ment rise.The content of the high field strength elements decreases in the K-feldspathized granite phase and pyrite ser-icite quartzite alteration phase and increases in the sericite quartzite phase.After studying the relationship between al-tered rock band and prospecting,it is found that pyritization,sericitization,silicification are direct signals of the pros-pecting.From the large scale,strongly altered rocks of Guojiabu District,the drilling data show that the content of Au reaches the cut-off grade and the good mineralization conditions in surrounding areas,it is speculated there are good metallogenic prospects in Guojiabu District.
参考文献
| [1] | 徐述平 .招平断裂带金矿勘查模型与成矿预测[D].中国地质大学(北京),2009. |
| [2] | 徐述平,邓军,高帮飞,杨立强,江少卿.胶东山后金矿床地质体微量元素特征及找矿意义[J].地质与勘探,2008(05):23-29. |
| [3] | 徐九华,谢玉玲,刘建明,朱和平,贾长顺.玲珑-焦家式金矿床流体包裹体的稀土和微量元素特征[J].岩石学报,2005(05):1389-1394. |
| [4] | 王建国,刘洪臣,邓军,张静,刘秉光,钱进.胶东谢家沟金矿稀土元素特征及其成矿意义[J].地质学报,2009(10):1497-1504. |
| [5] | 辛洪波,王建国,曲晓明,邓光,韦延光.胶东谢家沟金矿岩石地球化学及流体包裹体研究[J].地质与勘探,2007(05):61-67. |
| [6] | 胡宝群,高海东,申玉科,郭涛,吕古贤,武际春.玲珑金矿大开头矿区金的赋存特征及其成因意义[J].东华理工大学学报（自然科学版）,2013(04):357-363. |
| [7] | 高海东,胡宝群,吕古贤,武际春,郭涛,王志华,王乃伟,李元志.玲珑金矿大开头矿区47号脉微量元素特征[J].地质力学学报,2013(01):53-62. |
| [8] | 申玉科 .胶西北金矿集中区构造-蚀变网络研究[D].中国地质大学(北京),2006. |
| [9] | 郭涛 .胶西北金矿区域成矿系统及其构造-流体-矿化研究[D].中国地质大学(北京),2005. |
| [10] | 张文钊,徐述平.招平断裂带成矿特征与找矿靶区[J].黄金科学技术,2006(02):1-10. |
| [11] | 王超凡,吕古贤,郭涛,申玉科,周国发,刘维民,徐增田,刘正.玲珑金矿田破头青断裂带稀土和矿化元素特征分析[J].吉林地质,2010(01):99-104. |
| [12] | 李金祥 .胶东西北部招平断裂带构造特征与成矿[D].中国地质大学(北京),2005. |
| [13] | 吕古贤;武际春;崔书学.胶东玲珑金矿田地质[M].北京:科学出版社,2005:341-375. |
| [14] | 吕承训 .胶东金矿区域构造蚀变岩带地质特征与流体成矿规律研究[D].北京:中国地质大学(北京),2012. |
| [15] | 丁式江 .绿岩带型金矿综合地质异常研究---以胶东焦家金矿为例[D].北京:中国地质大学(北京),1998. |
| [16] | 张可清,杨勇.蚀变岩质量平衡计算方法介绍[J].地质科技情报,2002(03):104-107. |
| [17] | 林博磊,李碧乐.胶东玲珑花岗岩的地球化学、U-Pb年代学、Lu-Hf同位素及地质意义[J].成都理工大学学报（自然科学版）,2013(02):147-160. |
| [18] | 周国发 .玲珑金矿田构造蚀变岩带及找矿预测研究[D].中国地质大学(北京),2009. |
| [19] | 王超凡 .胶东玲珑-焦家式金矿热液蚀变交代作用的实验研究[D].北京:中国地质科学院,2010. |
| [20] | 杨敏之;李治平 .胶东东部金青顶金矿床围岩蚀变岩带的地球化学,形成机理及找矿方向的研究[J].地质找矿论丛,1989,4(02):1-17. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%