By Lisa A. Morgan
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Extra info for Hydrothermal Processes Above the Yellowstone Magma Chamber: Large Hydrothermal Systems and Large Hydrothermal Explosions (Geological Society of America Special Paper)
6 km from the Turbid Lake crater rim. Mary Bay Hydrothermal Explosion Crater The Mary Bay hydrothermal explosion crater has formed a large embayment in the northern basin of Yellowstone Lake (Fig. 8A). 8 km (Table 1) making it the largest documented feature of this type in the world (Browne and Lawless, 2001). The central part of the crater shows clearly in the bathymetric image of the lake floor in Mary Bay (Fig. 7). The Mary Bay hydrothermal explosion crater extends subaerially northeast from the northern basin of Yellowstone Lake, where steep (~30° slope), 30–40-m-high cliffs expose explosion breccia in the upper part of the crater wall northeast of Yellowstone Lake (Fig.
Flanks of the large hydrothermal explosion craters show no constructive rim of ejected material, unlike their subaerial equivalents, which probably results from explosion into a different medium. Flanks of the large craters are outward sloping and are mantled with younger lacustrine sediment. Hydrothermal breccia deposits exposed in wave-cut bluffs along the northern shore of Yellowstone Lake between Storm Point and Mary Bay provide evidence concerning the recent hydrothermal history of the northern lake area.
2003, 2007a; Morgan and Shanks, 2005). The northern rim of Elliot’s Crater rises ~40 m above the flat-bottomed main crater floor whereas the southern crater rim is ~30 m above the crater floor. The elevation of the northern crater rim relative to the southern rim (Fig. 12A) may reflect (1) location of the crater on the edge of a rhyolitic lava flow (Morgan and Shanks, 2005), (2) sediment accumulation due to near-shore depositional processes, and/or (3) doming associated with hydrothermal inflation, as documented by Johnson et al.