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Abundant geochemical and petrological data are available for the 1980–1986 and 2004–2006 eruptive periods and some of the units of the most recent Spirit Lake stage at Mount St. Helens. However, with the exception of bulk rock data, few geochemical data are available for the earlier eruptive units, including the Ape Canyon, Cougar, and Swift Creek stages. Here, the early magmatic history of Mount...
Hot springs can occur in amagmatic settings, but the mechanisms of heating are often obscure. We have investigated the origin of the Truth or Consequences, New Mexico low‐temperature (approximately 41°C) hot springs in the southern Rio Grande Rift. We tested two hypotheses that could account for this amagmatic geothermal anomaly: lateral forced convection in a gently dipping carbonate aquifer and...
The origin of large‐scale ancient dolomite is one of the most hotly debated topics in sedimentology. The Loushanguan group of the upper 3rd‐Furongian Cambrian series on the south‐eastern margin of the Sichuan Basin consists of numerous dolomites, and the origins of these dolomites have never been reported previously although they are probably good hydrocarbon reservoirs. Based on a systematic analysis...
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