In September 1975 the South Australian Department of Mines accepted a proposal from Amdel Ltd to purchase and set up some microthermometry apparatus, in order to commence fluid inclusion studies of selected rock types and minerals in South...
In September 1975 the South Australian Department of Mines accepted a proposal from Amdel Ltd to purchase and set up some microthermometry apparatus, in order to commence fluid inclusion studies of selected rock types and minerals in South Australia. The aim of the new project is to apply fluid inclusion study techniques in detail to a number of petrogenetic problems which exist in the State, by obtaining evidence of local ore and mineral-forming physical and chemical conditions. When considered in conjunction with other geological evidence such as field relations of rocks, their petrology and mineralogy, etc, it may then be possible to establish the following: (i) The genetic relationship of igneous intrusions to related hydrothermal veins (i.e. by measuring progressive changes in mineral formation temperature and nascent fluid salinity towards the intrusion); (ii) Progressive changes of temperature and composition during mineralisation; (iii) Thermal gradients in ore veins; (iv) The likely genesis and classification of individual ore deposits (e.g. porphyry coppers, Mississippi Valley-type Pb-Zn deposits); (v) The effects of metamorphism and the cause of facies changes; (vi) The nature of mineralisation as being of hydrothermal or supergene origin; (vii) The origin or source of minerals in sedimentary rocks; and (viii) The physical conditions necessary for the formation of fracture porosity (e.g. in petroleum reservoir rocks).
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