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Record 13 of 610
Mapping the distribution of vesicular textures on silicic lavas using the Thermal Infrared Multispectral Scanner
Author and Affiliation:
Ondrusek, Jaime(NASA, Washington, DC, United States)
Christensen, Philip R.(NASA, Washington, DC, United States)
Fink, Jonathan H.(Arizona State Univ., Tempe, United States)
Abstract: To investigate the effect of vesicularity on TIMS (Thermal Infrared Multispectral Scanner) imagery independent of chemical variations, we studied a large rhyolitic flow of uniform composition but textural heterogeneity. The imagery was recalibrated so that the digital number values for a lake in the scene matched a calculated ideal spectrum for water. TIMS spectra for the lava show useful differences in coarsely and finely vesicular pumice data, particularly in TIMS bands 3 and 4. Images generated by ratioing these bands accurately map out those areas known from field studies to be coarsely vesicular pumice. These texture-related emissivity variations are probably due to the larger vesicles being relatively deeper and separated by smaller septa leaving less smooth glass available to give the characteristic emission of the lava. In studies of inaccessible lava flows (as on Mars) areas of coarsely vesicular pumice must be identified and avoided before chemical variations can be interpreted. Remotely determined distributions of vesicular and glassy textures can also be related to the volatile contents and potential hazards associated with the emplacement of silicic lava flows on Earth.
Publication Date: Sep 10, 1993
Document ID:
19940033381
(Acquired Dec 28, 1995)
Accession Number: 94A10036
Subject Category: GEOPHYSICS
Document Type: Journal Article
Publication Information: Journal of Geophysical Research (ISSN 0148-0227); 98; B9; p. 15,903-15,908.
Publisher Information: United States
Contract/Grant/Task Num: NSF EAR-90-18216; NAGW-529
Financial Sponsor: NASA; United States
Organization Source: NASA; Washington, DC, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CHEMICAL COMPOSITION; INFRARED IMAGERY; LAVA; SILICATES; TEXTURES; PUMICE; REMOTE SENSING; THEMATIC MAPPING
Imprint And Other Notes: Journal of Geophysical Research vol. 98, no. B9 p. 15,903-15,908. Sept. 10, 1993
Availability Source: Other Sources
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