摘要
采用ETM+数据,利用主成分分析提取了研究区的铁染和羟基蚀变信息;利用ASTER数据提取了研究区的蛇纹石化、绿泥石化及高岭土等蚀变信息,并利用实测的橄榄岩及方辉橄榄岩光谱数据,与遥感图像特征进行光谱匹配,提取了研究区的橄榄岩与方辉橄榄岩信息;利用HIS高光谱数据提取了蛇纹石、绿泥石及其铬铁矿的相关信息。遥感蚀变信息提取结果显示:研究区的蚀变总体沿NW向展布,并且向研究区的东部外围进行延展。同时,采用ALOS数据提取了研究区的岩性及构造信息,发现蚀变主要赋存于橄榄岩与方辉橄榄岩中,这也是赋存铬铁矿的主要岩石特征。另外,在研究区的ES部存在线-环构造交错的区域,这为矿产的集中与分布提供了极为有利的场所。根据蚀变、构造、岩性等综合分析所得:构造集中的地段与橄榄岩、方辉橄榄岩中的强蚀变区域吻合,在线-环构造相交的部位及环形构造的内部,可进行野外的重点勘查,探寻找矿及探矿的突破口。
The ferric and hydroxy alterations information in the investigated area was extracted from ETM ＋ data by PCA. The alteration information of serpentinization, chloritization, kaolinizatin and so on in the investigated area was extracted from ASTER data. By matching the measured spectroscopic data of peridotite and saxonite with the remote sensing images, the information of peridotite and saxonite in the investigated area was extracted. The serpentine, chlorite and its chromite information was extrac- ted from HIS hyperspectral data. The extracted remote sensing alteration data revealed that the aherations in the investigated area present with the features of spreading in NW direction, and spreading to and over the eastern periphery, Meanwhile, the lithological characteristics and structure information extracted from ALOS data discovered that alterations mainly occur in peridotite and saxonite, and that is the major petrological characteristics for occurrence of chromite ore. There is a line - ring structures crossing area in the SE part of the investigated area, and it offers a quite favorable place for mineral concentration. According to the comprehensive analysis of the alterations, structures and li- thological characteristics, it was concluded that the structure con- centration zones coincide with the strong alteration areas in peri- dotite and saxonite, the line - ring structures crossing area, and the internal part of ring structures are the key exploration targets in the investigated area.
出处
《矿业研究与开发》
CAS
北大核心
2012年第6期43-47,共5页
Mining Research and Development
基金
数学地质四川省重点实验室开放基金项目(SCSXDZ2009009)
国土资源部西藏自治区矿产资源潜力评价项目(1212010813025)
关键词
罗布莎
铬铁矿
多源遥感信息
找矿靶区
Luobusha, Chromite deposit, Muhisource RemoteSensing information, Target area of prospecting
