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Fluorapatite from Cerro de Mercado, Durango, Mexico has been used in several important diffusion studies aimed at calibrating the closure temperature of the (U–Th)/He apatite thermochronometer and has become a de facto standard for (U–Th)/He laboratories. Nevertheless, replicate laser fusion analyses of small crystal fragments of the “Durango fluorapatite” typically yield a range of (U–Th)/He dates...
Mineral deposition in shallow submarine gasohydrothermal vents may be triggered by microbial activity according to isotopic data obtained for sulphides and carbonates. Submarine gasohydrothermal vents in Punta Mita, at the western coast of Mexico, discharge a mixture of water and gas (mainly nitrogen and methane) at a temperature of 85 °C. Algal mats cover the areas where thermal fluids are being...
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