Fluid regimes during late stages of a continental collision: Physical, chemical, and stable isotope measurements of fluid inclusions in fissure quartz from a geotraverse through the Central Alps, Switzerland

Zn-Pb Ores of Mississippi Valley Type in the Lycksele-Storuman District, Northern Sweden: A Possible Rift-Related Cambrian Mineralisation Event

“…Two gas-filled inclusions showed critical homogenisation at −31.0 °C and −79.4 °C respectively. The temperatures are all above the critical temperature (−82.1 °C) of pure methane and suggest that the hydrocarbon inclusions ( Figure 13) are composed of a mixture of variable proportions of methane and >1 mole% higher-molecular-weight hydrocarbons [22]. Raman analysis (Figure 14) confirms the presence of methane with a band at 2.911 cm [23] and aromatic hydrocarbon compounds at 3.072 [24], and possibly also the weaker band at 3.210 cm …”

Genesis of alpinotype fissure minerals from Thasos Island, Northern Greece - Mineralogy, mineral chemistry and crystallizing environment.

“…CO 2 -bearing fluid must have prevailed during crystallization of Tessin-habit quartz in Thasos island and this should have taken place in the transition from a compressional to an extensional tectonic regime, as is the case in the central Alps (Heijboer, 2006;Heijboer et al, 2003). Late incursion of meteoric and/or seawater at depth may have caused the crystallization of the prismatic-habit quartz scepters at lower temperatures from NaCl-and KCl-bearing hydrothermal fluids (as suggested by Mullis et al, 1994). Thasos Island (and Dassoto area of Drama) is to our knowledge a unique case among the Alpine fissure occurrences in Europe, where two types of quartz crystals (with both prismatic and Tessin-habit) coexist in the same fissure.…”

“…Previous work on alpinotype fissure vein mineralization suggest that their formation started after the peak metamorphic conditions and is mainly related to retrograde evolution from fluid circulation during the final stages of continental collision (Mullis et al, 1994). In Thasos Island, the formation of alpinotype fissures is closely related to the exhumation of the Southern Rhodope Metamorphic Core Complex during the Oligocene-Miocene (Brun and Sokoutis, 2007).…”

“…This temperarute range also fits very well to crystallization temperatures from Tessin-habit quartz from the Kavala, intrusion-related Bi-Te-Au deposit (Fornadel et al, 2011). It has been suggested by Stalder and Touray (1970), Mullis (1975) and Mullis et al (1994Mullis et al ( , 2001) that Tessin-habit quartz in the Alps can only be formed under high fCO 2 values of the hyodrothermal solutions. This is in accordance with available data from Dassoto and Kavala, where CO 2 bearing fluid inclusions occur in the Tessin-habit crystals (Melfos and Voudouris, 2006;Melfos et al, 2008;Fornadel et al, 2011).…”

Sulphur isotope geochemistry of black shale-hosted antimony mineralization, Arnsberg, northern Rhenish Massif, Germany: implications for late-stage fluid flow during the Variscan orogeny

“…By applying geochemical, isotopic and fluid inclusion studies to these mineralizations, the fluid chemistry and the scale of fluid movements during orogenic processes can be reconstructed (e.g. Cox et al 1986;Gray et al 1991;Mullis et al 1994;Pettke et al 1999;Bierlein & Crowe 2000;Partington & Williams 2000;Barker et al 2000;Oliver & Bons 2001). These datasets can, in turn, be used to substantially improve integrated dynamic models, accounting for changes of fluid flow and mass transfer rates during orogenic cycles.…”