Environmental tracer data 2019

\n## **Abstract** \nThe database includes water quality and environmental tracer information for springs and nearby groundwater in the vicinity of Elsey National Park (near Mataranka in the Northern Territory) collected during a field campaign in October 2019. This information was used to identify the origin of groundwater at the springs, especially two regional flow paths of the Cambrian Limestone Aquifer, and the possibility of a contribution from deeper aquifer(s).\n\n\n## **Attribution** \nGeological and Bioregional Assessment Program\n\n\n## **History** \nSpring and groundwater samples were collected from the Mataranka Springs Complex between 16 - 20 October 2019. The locations of the springs and bores and the bore construction details can be found in Table S1. Note that bore RN034030 located in the Antrim Plateau Volcanics basalt was the only bore available in the area that had a screen located in a geological formation other than the CLA. The two largest springs (Rainbow Spring and Bitter Springs) flow at 0.3 – 0.8 m3 s–1 and generate short streams popular as tourist attractions before they cascade into the Roper River. Rainbow Springs has one cluster of vents over approximately a 10 m2 area generating the streamflow, whereas Bitter Springs appears to have many vents (>10) spread over a larger, densely vegetated area (~1000 m2) joining together to form a stream. Warloch Pond Spring is one of probably many vents discharging into Elsey Creek, whereas Fig Tree Spring discharges horizontally from a cavity in a tufa cliff along the riparian corridor of the Roper River. These smaller springs have not been gauged previously but are estimated to have a discharge