Use of Landsat thematic mapper data to map complex metamorphic terranes in arid areas: Meatiq Dome, Egypt

Conference · Tue Jan 01 04:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6273595

Sultan, M; Arvidson, R; Sturchio, N; Guinness, E

Meatiq Dome, a metamorphic complex in the Precambrian basement of the Eastern Desert of Egypt, exhibits many of the essential features of Cordilleran metamorphic core complexes, and exposes many of the Arabian-Nubian Shield rock units. Landsat Thematic Mapper (TM) data was correlated with mineralogic, chemical, and laboratory spectral reflectance measurements for representative samples from ground truth areas. Results indicate: 1) ratio of reflectances at (1.55 to 1.75)/(2.08 to 2.35) um is sensitive to the hydroxyl group content of the rocks, 2) reflectances at 1.55-1.75 um are inversely related to rock opaque phase content, and 3) reflectances computed at 0.83 um that are lower than observed band 4 reflectance are indicative of Fe bearing rocks rich in amphibole and biotite. We applied a linear interpolation between reflectances at 0.63 to 0.69 um and 1.55 to 1.75 um to compute band 4 reflectances. Using the above findings, a new geologic map was generated that shows: 1) 11 rock units, 7 of which, were not included in the geologic maps drawn in absence of TM data, 2) refolded open folds having F1 axes trending NE-SW refolded along F2 axes trending NNW-SSE consistent with inferred directions of ophiolite transport to the northwest and regional broad open folding direction about NNW trending axes, 3) previously unidentified outcrops of massive amphibolite juxtaposed against quartzofeldspathic mylonite that may imply the presence of a previously unrecognized detachment surface and, 4) mode of emplacement of intrusive rocks.

• Research Organization: Washington Univ., St. Louis, MO (USA)
• OSTI ID: 6273595
• Report Number(s): CONF-8510489-
• Conference Information: Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580203* -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
AERIAL SURVEYING
AFRICA
DEVELOPING COUNTRIES
EGYPTIAN ARAB REPUBLIC
GEOLOGIC STRUCTURES
LANDSAT SATELLITES
MAPPING
METAMORPHIC ROCKS
MINERALOGY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
REMOTE SENSING
ROCKS
SATELLITES
SPECTRAL REFLECTANCE
USES