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291.
Late Pleistocene regression of two large pluvial lakes—Lake Bonneville and Lake Lahontan—caused considerable lithospheric
rebound in the Basin-and-Range Province, USA. Here, we use finite-element models to show how lake growth and regression affect
the temporal and spatial slip evolution on faults near the former lakes. Our results show that fluctuations in the volume
of Lake Bonneville caused along-strike slip variations on the Wasatch normal fault, with a pronounced slip rate increase on
its northern and central parts during lake regression. The response of normal and strike-slip faults near the ring-shaped
Lake Lahontan depends on their location within the rebound area. Faults located in the centre of rebound show a slip rate
increase during lake regression, whereas strike-slip faults at the periphery decelerate. All slip rate variations are caused
by differential stress changes owing to changing lake levels, regardless of the individual fault response. 相似文献
292.
Robert Marschik Tobias Bauer Ana-Sophie Hensler Nikos Skarpelis Stefan Hölzl 《Resource Geology》2010,60(4):335-347
The Pb-Zn-Ba(-Ag-Au) mineralization in the Triades and Galana mine areas is hosted in 2.5–1.4 Ma pyroclastic rocks, and structurally controlled mostly by NE-SW or N-S trending brittle faults. Proximal pervasive silica and distal pervasive sericite-illite alteration are the two main alteration types present at the surface. The distribution of mineralization-alteration in the district suggests at least two hydrothermal events or that hydrothermal activity lasted longer at Galana. The Sr isotope signature of sphalerite and barite (87Sr/86Sr = 0.709162 to 0.710214) and calculated oxygen isotope composition of a fluid in equilibrium with barite and associated quartz at temperatures of around 230°C are suggestive of a seawater hydrothermal system and fluid/rock interaction. Lead isotope ratios of galena and sphalerite (206Pb/204Pb from 18.8384 to 18.8711; 207Pb/204Pb from 15.6695 to 15.6976; 208Pb/204Pb from 38.9158 to 39.0161) are similar to those of South Aegean Arc volcanic and Aegean Miocene plutonic rocks, and compatible with Pb derived from an igneous source. Galena and sphalerite from Triades-Galana have δ34SVCDT values ranging from +1 to +3.6‰, whereas barite sulfate shows δ34SVCDT values from +22.8 to +24.4‰. The sulfur isotope signatures of these minerals are explained by seawater sulfate reduction processes. The new analytical data are consistent with a seawater-dominated hydrothermal system and interaction of the hydrothermal fluid with the country rocks, which are the source of the ore metals. 相似文献