FA94DD10A0810C44E040CD9B2144660AEnglishManager Geoscience Business SystemsDepartment of Mining and EnergyManager Geoscience Business Systems(08) 8999 5448(08) 8999 6824geoscience.spatial@nt.gov.au2021-10-22AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Northern Territory Geochronology Samarium-Neodymium (Sm-Nd) Isotopic Dataset1998-01-01This dataset comprises samarium-neodymium (Sm-Nd) isotopic ratios and model age determinations of whole rock and mineral samples from the Northern Territory. The data are sourced from the Northern Territory Geological Survey (NTGS) and collaborating researchers and laboratories. This dataset comprises sample metadata, analytical data and bibliographic references, isotopic ratios are measured using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-)methods. Initial epsilon Nd values for igneous rocks are corrected to the magmatic crystallisation age of the sample where known. In instances where absolute ages are not constrained but relative age relationships provide a constraint and inferred age is used. Corrections are only applied to sedimentary rocks where the sample has a unimodal age or the sequence contains a dated volcanic unit. The dataset is updated on an annual basis.Only open file data available. Copyright Northern Territory of Australia (Northern Territory Geological Survey) 2020. With the exception of the Northern Territory of Australia logo, other government and corporate logos and where otherwise noted, all material in this publication is provided under a Creative Commons Attribution 4.0 International licence (https://creativecommons.org/licenses/by/4.0/legalcode). You are free to re-use the work under the licence, on the condition that you attribute the Northern Territory of Australia (Northern Territory Geological Survey) and comply with the other licence terms. Disclaimer: While all care has been taken to ensure that information contained in this publication is true and correct at the time of publication, changes in circumstances after the time of publication may impact on the accuracy of its information. The Northern Territory of Australia gives no warranty or assurance, and makes no representation as to the accuracy of any information or advice contained in this publication, or that it is suitable for your intended use. You should not rely upon information in this publication for the purpose of making any serious business or investment decisions without obtaining independent and/or professional advice in relation to your particular situation. The Northern Territory of Australia disclaims any liability or responsibility or duty of care towards any person for loss or damage caused by any use of, or reliance on the information contained in this publication.English-28-11127.5139.51998-01-01datasetnot knownThe dataset coverage is complete for the Northern Territory and bordering regions up to 1 degree 30 minutes distal east and west and up to 1 degree distal to the south.0not knownA geoscientist visually inspected the finished dataset to make sure the attributes were accurate and the data were consistent spatially with the quality-controlled database it was derived from. Tests are also carried out on these data for data completeness, correct spatial representation, attribute accuracy, logical consistency and correctness. 0not knownNominal Scale: 1:100 000 The positional accuracy is variable but usually not better than 100m0not knownThe isotopic data comes from samples analysed by geochronologists from NTGS, Geoscience Australia, researchers or analytical laboratories operating in collaboration with NTGS. Data in the dataset has been checked against the original source.0This dataset is derived from published NTGS studies and data acquired during NTGS projects currently in progress. The data sources are recorded within the dataset. NTGS AND LEGACY DATA: Published data is continually updated.