REMOTE DETERMINATION OF EXPOSURE DEGREE AND IRON CONCENTRATION OF LUNAR SOILS USING VIS-NIR SPECTROSCOPIC METHODS

被引:139
作者
FISCHER, EM
PIETERS, CM
机构
[1] Department of Geological Sciences, Brown University, Providence, RI 02912
关键词
D O I
10.1006/icar.1994.1158
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
On the Moon, space weathering processes such as micrometeorite bombardment alter the optical properties of lunar soils. As a consequence, lunar soil optical properties are a function not only of composition, but of degree of exposure on the lunar surface as well. In order to accurately assess the compositional properties of the lunar surface using remotely acquired visible and near-infrared spectroscopic data, it is thus necessary either (1) to compare optical properties only of soils characterized by similar degrees of exposure or (2) to otherwise normalize or remove the optical effects due to exposure. Laboratory spectroscopic data for lunar soils are used to develop and test remote spectroscopic methods for determining degree of exposure and for distinguishing between the optical effects due to exposure and those due to composition. A method employing a ratio between reflectances within and outside of the 1 mu m Fe2+ crystal field absorption band was developed for remotely identifying highland soils that have reached a steady-state maturity. The relative optical properties of these soils are a function solely of composition and as such can be directly compared. Spectroscopic techniques for accurate quantitative determination of iron content for lunar highland soils are investigated as well. It is shown that approximations of the 1 mu m Fe2+ absorption band depth using few to several channel. multispectral data or spectroscopic data of inadequate spectral range cannot be used with confidence for compositional analysis. However, band depth measurements derived from continuum-removed high spectral resolution data can be used to calculate the weight percent FeO and relative proportion of iron-bearing silicates in mature lunar highland and mare/highland mixture soils. A preliminary effort to calibrate telescopic band depth to laboratory soil measurements is described. (C) 1994 Academic Press, Inc.
引用
收藏
页码:475 / 488
页数:14
相关论文
共 55 条
[1]   VISIBLE AND NEAR-INFRARED DIFFUSE REFLECTANCE SPECTRA OF PYROXENES AS APPLIED TO REMOTE-SENSING OF SOLID OBJECTS IN SOLAR-SYSTEM [J].
ADAMS, JB .
JOURNAL OF GEOPHYSICAL RESEARCH, 1974, 79 (32) :4829-4836
[2]  
ADAMS JB, 1978, MARE CRISIUM VIEW LU, V24, P81
[3]  
BASU A, 1981, 12TH P LUN PLAN SCI, P433
[4]  
BASU A, 1979, P LUNAR PLANET SCI C, P1413
[5]  
BASU A, 1977, 8TH P LUN SCI C, P3617
[6]   LUNAR DARK-HALOED IMPACT CRATERS - ORIGIN AND IMPLICATIONS FOR EARLY MARE VOLCANISM [J].
BELL, JF ;
HAWKE, BR .
JOURNAL OF GEOPHYSICAL RESEARCH, 1984, 89 (NB8) :6899-6910
[7]   GALILEO ENCOUNTER WITH 951 GASPRA - 1ST PICTURES OF AN ASTEROID [J].
BELTON, MJS ;
VEVERKA, J ;
THOMAS, P ;
HELFENSTEIN, P ;
SIMONELLI, D ;
CHAPMAN, C ;
DAVIES, ME ;
GREELEY, R ;
GREENBERG, R ;
HEAD, J ;
MURCHIE, S ;
KLAASEN, K ;
JOHNSON, TV ;
MCEWEN, A ;
MORRISON, D ;
NEUKUM, G ;
FANALE, F ;
ANGER, C ;
CARR, M ;
PILCHER, C .
SCIENCE, 1992, 257 (5077) :1647-1652
[8]  
BORG J, 1980, P C ANCIENT SUN, P431
[9]  
Burns R.G., 1993, REMOTE GEOCHEMICAL A, P3
[10]  
Carrier W. D., 1991, LUNAR SOURCEBOOK, P530, DOI DOI 10.1006/ICAR.1999.6165