摘要
为了解秘鲁国铁矿分布规律,对秘鲁22.5万km2的航磁资料进行了化极、延拓、求导等各种处理工作,通过分析已知铁矿的航磁异常,结合秘鲁区域地质构造以及秘鲁各地质年代地层及岩性特征,归纳得出与不同铁矿类型有关的磁异常类型。它们主要有:陆相火山喷溢型的铁矿异常;受断裂构造控制的与第三纪早、中期的火山喷发物质有关的磁异常区;第三纪早、中期的火山喷发物质掩盖区的磁异常;分布于海岸带内的正磁异常带;位于闪长岩体的岩浆期后热液脉状铁矿异常;矽卡岩型铁矿异常。这对认识安第斯山大地构造以及圈定有利的铁矿成矿靶区有一定的意义。
Peru is rich in iron ore resources. Aeromagnetic is an important approach for iron deposit prospecting directly or indirectly. In order to understand distribution of iron bodies by using aeromagnetic information, various data process approaches such as reduction to the pole, continuation and derivative have been carried out for the 2 250 000 km2 aeromagnetic raw data. Combined with regional geological structure and geological strata and lithology of Peru, various magnetic anomalies concerned with iron ore types are selected. The anomalies include： anomalies induced by continental facies eruption; the magnetic anomalies which are controlled by faults and concerned with the volcanic eruptions in early and middle Tertiary;the anomalies induced by the early and middle Tertiary volcanic eruptions covered areas;the positive magnetic anomalies belt induced by the coast rock band;anomalies induced by post-magmatic hydro- thermal iron ore vein located in diorite rock ; skarn iron ore anomalies.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第5期604-609,共6页
Geophysical and Geochemical Exploration
关键词
秘鲁
安第斯山
区域地质
航磁异常
铁矿类型
Peru
Andes
regional geology
aeromagnetic anomalies
iron ore deposit
