Abstract
In the Long Flat district of northeastern New South Wales, elongate lenses composed largely of quartz and kaolinite have been produced by the alteration of Palaeozoic volcaniclastic sedimentary rocks and silicic dykes. Alteration was brought about by heated acid waters, probably at temperatures of about 200°C, that circulated along fractures in otherwise impervious rocks, and the lenses are considered to delineate discharge channels of a hydrothermal circulation system associated with a cooling granite pluton. High water: rock ratios are indicated. SiO2 was added during alteration and CaO, Na2O, MgO and Sr, Cu, Zn and Pb were removed. Some of the metals mobilized may have formed mineralized veins of the type found in the surrounding region.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
