Fig. 8
From: Exposed soil and mineral map of the Australian continent revealing the land at its barest
Perspective view of a enhanced Barest Earth output showing variations in surface mineralogy. We used enhanced mineral mapping techniques to produce a thematic mineral map of the Australian continent using the Barest Earth mosaic, a subset of north central Western Australia is shown above (a). The second principal component of ratio bands NIR/RED and SWIR1/SWIR2 is used to highlight clays (red); the SWIR1/NIR ratio represents iron oxides (green) and the addition of BLUE and SWIR2 represents highly reflective materials, such as silica-rich bedrock or quartz sand. This is perspective draped over a digital elevation model of the region. Key features (b) include: (1) alluvial sands and clays, (2) colluvial sediments including iron gravels, sand and clay, (3) colluvial clays, (4) proterozoic mudstone and siltstone, (5) proterozoic dolerite and gabbro and (6) reworked lateritic colluvial gravels. Mineral enhanced 3-D perspective drape with clays in red; iron oxides in green and highly reflective materials like silica-rich bedrock or quartz sand in blue.
