溧阳盆地东南缘永坞头地区自然重砂异常圈定及其物源区分析

Anomaly delineation and provenance analysis of natural heavy minerals in the Yongwutou area, southeast of the Liyang Basin

自然重砂测量是矿产勘查的重要手段之一,以往的自然重砂测量工作主要侧重于目标矿物量的研究,圈定的异常仅有矿物含量的意义,忽视了矿物迁移、富集规律,很大程度上影响了找矿效果。以溧阳永坞头地区为例,从重矿物剥蚀、迁移、富集规律出发,对自然重砂数据进行整理,重新圈定重砂异常,并利用重矿物组合特征、稳定系数及特征指数(ZTR)对异常源区进行判断。研究表明,圈定的2处锡石自然重砂异常源区分别为永坞头404.60高地—413.10高地一带以及387.60高地一带。

Survey of heavy minerals is an important method in mineral exploration. Previous survey of heavy minerals focused on absolute concentrations of main minerals and delineated anomalies only indicated their concentrations, which has frequently ignored the migration, enrichment of minerals and thus influenced prospecting effect. Taking the Yongwutou area of Liyang as an example, this work sorted the survey data of heavy minerals and re-delineated anomalies according to the denudation, migration, enrichment of heavy minerals. Based on the assemblage characteristics of heavy minerals, stability factor and ZTR, we discriminated the source area of heavy minerals. The result show that two delineated anomalies of tungsten originate respectively from highland 404.60-413.10 and highland 387.60 in the Yongwutou area.