Loading...
Please wait, while we are loading the content...
Similar Documents
Hyperspectral and Field Mapping of an Archaean Komatiite Unit in the Pilbara Craton, Western Australia: Applications for Crism Mission
| Content Provider | Semantic Scholar |
|---|---|
| Author | Brown, Adrian. J. Walter, Malcolm R. Cudahy, Thomas |
| Copyright Year | 2004 |
| Abstract | Introduction: Recent VNIR-SWIR airborne hyperspectral investigations of the Early Archaean East Pilbara Granite-Greenstone Terrane have mapped hydrothermal alteration minerals in a predominantly mafic volcanic terrane. The investigation has identified a previously unrecognized aqueously altered komatiite flow. Results of this project are of direct relevance to the forthcoming hyperspectral investigation of the Martian surface by the CRISM instrument, scheduled to launch on MRO in 2005. Pilbara investigations: In October 2002 a VNIRSWIR airborne hyperspectral study was commenced by the CSIRO and the Australian Centre for Astrobiology with the goal of mapping hydrothermal alteration patterns throughout a 600 km area of the Pilbara termed the North Pole Dome (NPD). The NPD is largely constituted by volcanic rocks of the 3.5 Ga Warrawoona Group with some minor, but important volcaniclastic interbedded sediments. These sediments have been reported to hold evidence of the Earth's earliest biota [1,2] although this has recently been the subject of much debate in the Astrobiological community [3]. The HyMap instrument [4] was used to collect the airborne hyperspectral dataset. 14 swathes of various lengths and 2km in width were obtained during mid morning on 22 Oct 02. The instrument was flown at approximately 2.5km (8200ft) AMSL. Spectral coverage spanned 450-2500 nanometers in 126 contiguous bands. Across-track pixel spatial resolution was approximately 5m. This high spatial resolution gives excellent definition of the abundant outcrop of well exposed Archaean rocks. Mapping of individual hydrothermal fluid conduits at the NPD has been possible at this resolution. CRISM Mission: The first primary mission of the CRISM instrument is to “find new targets of interest: aqueous deposits and crustal composition” [5]. During this part of the mission, CRISM will operate in a hyperspectral, high spatial resolution mode. In addition to this mode of operation, CRISM has a multispectral, lower spatial resolution mode for less intense mapping, and has an Emission Phase Function (EPF) mode to map surface and atmospheric variations to provide information on aerosols, H2O, CO and ices. Comparisons between the HyMap instrument and CRISM are listed in Table 1. The HyMap dataset most closely approximates the hyperspectral mode of CRISM. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.lpi.usra.edu/meetings/lpsc2004/pdf/1420.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
