摘要
内蒙古东部草原地区成矿地质条件优越,但由于普遍遭受风成砂覆盖,常规地球化学勘查方法受到较大限制。为优选出更有效的地球化学勘查方法,选择内蒙古东部洛恪顿铅锌矿作为试验研究区,开展了土壤热磁组分和土壤细颗粒测量2种方法对比研究。结果表明,在90 m覆盖深度的见矿区,2种方法均能圈出指示元素异常,热磁组分测量具有异常强度高、连续性好的优势,细粒级测量具有便捷与相对经济的优势。对于盖层厚度在200 m的见矿区,细粒级测量元素异常较弱,与矿体吻合程度相对较低,热磁组分测量则能够圈出分带明显,与矿体吻合较好的元素异常。因此在覆盖厚度较大的地区,土壤热磁组分测量方法更具优势。
Due to the common coverage of aeolian sand,the effect of conventional geochemical exploration methods is limited in eastern Inner Mongolia,which leads to the inefficiency of concealed ore exploration in spite of superior metallogenic geological condition there.In order to select most effective geochemical exploration methods suitable for eastern Inner Mongolia,the authors studied the effectiveness and practicability of thermal magnetic components and fine-grain survey in the Luokedun lead-zinc deposit. The results are as follows： At orebody location covered by the depth of 90 m,two methods all can delineate the anomalies clearly. Thermal magnetic component survey has the advantages of stronger intensity and better continuity,whereas fine-grained soil survey has the convenient and relatively economical advantages. For the overlying thickness of over 200 m,the anomaly of thermal magnetic component survey is more obvious relative to the anomaly detected by fine-grained soil survey,and the anomaly is fairly consistent with the known orebody. Therefore,it is better to choose the method of thermal magnetic component survey to explore concealed ore deposits whose buried depth is over 90 m in eastern Inner Mongolia.
作者
唐世新
李建军
马生明
TANG Shi-Xin;LI Jian-Jun;MA Sheng-Ming(Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China;Key Laboratory for Geochemical Exploration Technology,MLR, Langfang 065000, China;Geological Surveying and Mapping Institute of Hebei Province, Langfang 065000, China)
出处
《物探与化探》
CAS
CSCD
北大核心
2018年第3期499-505,共7页
Geophysical and Geochemical Exploration
基金
中国地质科学院基本科研业务费专项资助项目(YYWF201731)
中国地质科学院地球物理地球化学勘查研究所基本科研业务费专项资金项目(AS2014J10)
中国地质调查局地质调查项目(DD20160040)
国家科技支撑计划项目(2014BAB05B00)
关键词
内蒙古东部
运积物覆盖
热磁组分
土壤细粒级
方法优选
eastern Inner Mongolia
transported overburden
thermal magnetic component
fine-grained soil
method optimization
