Timing and Chemistry of Fluid-Flow Events in the Lawn Hill Platform, Northern Australia

Chemical and mineralogical characterisation of illite–smectite: Implications for episodic tectonism and associated fluid flow, central Australia

“…A similar variability of IC values with depth was seen in the Mt Isa Basin, Australia, and was attributed to factors in addition to temperature (Uysal et al, 2004;Golding et al, 2006). Other factors affecting illitisation, and resultant illite crystallinity, include potassium availability (Pearce et al, 1991), time (Hillier and Clayton, 1989) and water/rock ratio (Uysal et al, 2000a;Uysal et al, 2004).…”

“…During the migration of tectonically-driven fluids along permeable fracture networks, fluid-rock interaction results in the precipitation of authigenic phases, including illite. Due to its composition, illite can be used for a number of geochronological and geochemical techniques (Clauer et al, 1993;Zwingmann et al, 1999;Uysal et al, 2000c;Uysal et al, 2006;Verdel et al, 2012;Middleton et al, 2014). High magnification microscopy of illite may reveal paragenetic and morphological data pertinent to constraining fluid-rock interaction history (Reuter and Dallmeyer, 1987;Yau et al, 1987;Wilson et al, 2014).…”

Illite occurrences related to volcanic-hosted hydrothermal mineralization in the Biga Peninsula, NW Turkey: Implications for the age and origin of fluids

“…In many cases, however, the fluid system is not so simple and the analyses from mixed fluid populations cannot be easily deciphered. An alternative, or addition, to the use of fluid inclusions is to determine the D and 18 O of clay/phyllosilicate minerals, which form as hydrothermal alteration products (e.g., Bechtel and Hoernes, 1990;Uysal et al, 2001;Golding et al, 2006;Middleton et al, 2014Middleton et al, , 2015. These can be more reliable and directly links the fluid to an effect, i.e., alteration and production of new mineral phases.…”

Integrating 40Ar–39Ar, 87Rb–87Sr and 147Sm–143Nd geochronology of authigenic illite to evaluate tectonic reactivation in an intraplate setting, central Australia

“…Therefore, it may not be possible to use these minerals to constrain the timing of regional tectonomagmatic activity (Cassata and Renne, 2013). In such cases, illitic clay minerals can offer a more robust alternative (Uysal et al, 2001;Golding et al, 2006;Uysal et al, 2006).…”

“…Moreover, if multiple generations of illite are identified, geochronology can determine episodic fluid flow and, therefore, reconstruct thermal and fluid flow histories associated with tectonic evolution of a sedimentary basin. Previously such work utilised Rb-Sr dating or a combination of RbSr and K-Ar (Ohr et al, 1991;Uysal et al, 2001;Uysal et al, 2004;Golding et al, 2006;Uysal et al, 2011). Dating by the Sm-Nd method was also integrated into these works, with varying success, due to its resistance to isotopic resetting compared to the Sr-or Ar-systems and allowed dating of multiple periods of hydrothermal fluid flow (Stille and Clauer, 1986;Ohr et al, 1991;Bros et al, 1992;Schaltegger et al, 1994;Toulkeridis et al, 1998).…”