Figure 3
From: Large-scale sill emplacement in Brazil as a trigger for the end-Triassic crisis
Modeled thermal effects of sills emplaced in Amazonas Basin sedimentary rocks at 1100 °C in intervals of 10,000 years, based on data from borehole ATZ, OAST and MAST. The temperature and vintrinite reflectance values (%Ro) increase, whereas the total inorganic carbon (TOC) content decreases toward each sill. Present day TOC and %Ro values (grey dots) generally follow the modeled values. Organic CO2 is generated in all aureoles, whereas generation of inorganic CO2 is restricted to aureoles within carbonate-bearing lithologies (upper Paleozoic series). For borehole ATZ, all sills are emplaced in the upper Paleozoic section, whereas for boreholes OAST and MAST, sills are emplaced in both upper and lower Paleozoic sedimentary rocks.
