四川甲基卡地区1∶5万水系沉积物地球化学特征及稀有金属找矿远景  

Prospecting Potential of Rare Metal and 1 ∶ 50 000 Stream Sediment Geochemical Characteristics in Jiajika Area in Sichuan Province

作　　者：徐云峰 王显锋[1,2] 胡朝云 秦宇龙[1,2] 周雪梅 

机构地区：[1]稀有稀土战略资源评价与利用四川省重点实验室,四川成都610081 [2]四川省地质调查院,四川成都610081

出　　处：《金属矿山》2018年第2期121-130,共10页Metal Mine

基　　金：四川扎坝-龙古地区矿产地质调查项目(编号:12120113049500);四川康定-道孚-雅江稀有金属整装勘查区矿产调查与找矿预测项目(编号:121201004000150017-93);四川康定瓦多-龙古地区1:5万区域地质调查项目(编号:DD20160074-02)

摘　　要：近10 a来,随着石油能源紧缺、环境污染日益严重,新能源汽车持续快速发展,使得锂电池材料需求不断增加。为寻求四川甲基卡地区锂辉石矿找矿突破,在该区开展了1∶5万水系沉积物测量工作。在对测试数据进行聚类分析及R型因子分析的基础上,对元素组合特征进行了研究。结果表明:研究区内测试的22种元素中,主成矿元素大致可以分为富集规律相似的Li-Be-Nb、Ag-Pb-Zn、Au-As-Cu 3组,其中Li、Be、Nb等稀有金属元素富集规律极为明显,且相关元素异常分布位置的叠合性较强。通过进行综合异常特征分析,确定了各元素的异常下限值,圈定了8个综合异常区(编号分别为AS-1~#、AS-2~#、AS-3~#、AS-4~#、AS-5~#、AS-6~#、AS-7~#、AS-8~#)。在对主要异常解译推断、成矿地质条件分析、矿产检查及工程验证的基础上,优选出惹一卡综合异常区和甲基卡综合异常区为找矿远景区。在1~#(惹一卡)找矿远景区新发现的R5含锂矿伟晶岩脉内Li_2O(334)预测资源量为11 776.5 t,达到中型级别;6~#(甲基卡)找矿远景区新发现的JN3含锂矿伟晶岩脉内Li_2O(334)预测资源量为50 790.3 t,伴生BeO(334)预测资源量达到2 770.38 t,Li、Be资源量均达到了中型级别。上述研究表明,通过在甲基卡地区开展1∶5万水系沉积物测量工作可为该区稀有金属找矿工作提供有价值的参考信息。With the oil shortage and environmental pollution are becoming increasingly serious,the rapid development of new energy vehicles makes the demand for lithium battery materials continue to increase over the past 10 years.1 ∶ 50 000 stream sediment survey method is adopted so as to seek the prospecting breakthrough of the spodumene ore in Jiajika Area in Sichuan Province.The test data is studied by cluster analysis and R-type factor analysis,and the element combination characteristics is discussed in detail.The study results show that among the 22 elements in the study area,the major ore-forming elements can be roughly divided into three groups,that is Li-Be-Nb,Ag-Pb-Zn and Au-As-Cu,the enrichment regularity of the rare metal elements of Li,Be and Nb is significant,and the overlapping features of the distribution area of the relative elements is also significant.Trough the analysis of the composite anomaly characteristics,the anomaly thresholds of the elements are determined,the 8 composite anomaly areas（named as AS-1#,AS-2#,AS-3#,AS-4#,AS-5#,AS-6#,AS-7#,AS-8#） are delineated respectively in the study area.The major anomalies are interpreated,the metallogenic geological conditions are discussed,the mineral inspection and engineering verification are conducted,the results show that Reyika and Jiajika composite anomaly are considered to be prospective areas.11 776.5 t resources reserves of lithium oxide are calculated in the R5 lithium ore pegmatite veins newly found in 1#（Reyika） prospective area,which reached to the medium deposit level; 50 790.3 t resource reserves of lithium oxide（334） and 2 770.38 t resource reserves of beryllium oxide（334） are calculated in the JN3 lithium ore pegmatite veins newly discovered in 6#（Jiajika） prospective area,which are both reached to the medium deposit level.The above study results further show that the 1 ∶ 50 000 stream sediment survey method can provide some reliable information for the prospecting work of rare metals in Jiajika Area.

关 键 词：稀有金属 水系沉积物测量 异常解译 找矿远景区 

分 类 号：P618.6[天文地球—矿床学]