河南熊耳山北部上观环形构造及其找矿意义

河南省西部的熊耳山地区是重要的金成矿集中区,区内环形--线性构造与成矿存在耦合关系。本研究中对最新高分SPOT--5图像和Aster的遥感地质解译发现,熊耳山北部上观周围区域存在多个环形构造,主要发育于太华群古老变质岩和熊耳群火山岩中,南部附近为中生代花山岩体。环形构造集中分布,大环套小环、线性和环形构造交切。影像蚀变信息提取研究发现,环形构造周围及其内部发育较好的铁染异常和羟基异常,具有良好的找矿前景。附近和周围已知的金矿床和金矿点零星分布,但其遥感图像与熊耳山其他类似环形构造发育地区相比,影像特征更为典型,且成矿条件似更为优越,有可能成为熊耳山地区又一个金银成矿集中区。

Circular structures of Shangguan in northern Xiong'er Mountain of Henan and its significance for prospecting

The region of Xiong''er Mountain in western Henan Province is important gold ore concentration area． Circular- linear structures are in coupling relationship with ore- forming process． Via conducting remote sensing geological interpretation of latest SPOT high- resolution remote sensing imagery and ASTEＲ imagery，new circular structures have been discovered around Shangguan in the northern Xiong''er Mountain． They mainly develop in ancient metamorphic rocks of Taihua Group and volcanic rocks of Xiong''er Group． Mesozoic Huashan granites dis- tribute around south of Shangguan． Multiple circular- structures are in concentrated distribution in this region． Mo- reover，large rings often trap small ones inside them． Circular and linear structures intersect each other． Study of alteration extraction from SPOT and ASTEＲ imagery shows that Abnormal iron- strain and hydroxyl are well devel- oped within and around region of circular structures，which suggests good prospecting foreground． Only a few gold deposits and gold occurrences are known around the studied region previously，while the interpretation of remote sensing imagery reveals wide distributions of suspected ore occurrences． Compared with other areas where circular structures develop in region of Xiong''er Mountain，the characteristics of imagery are more typical and more advanta- geous in metallogenic conditions． This area may become another ore concentration area of gold and silver in the re- gion of Xiong''er Mountain．