{"help": "https://data.gov.au/data/en/api/3/action/help_show?name=package_show", "success": true, "result": {"archived": false, "author_email": null, "contact_point": "clientservices@ga.gov.au", "creator_user_id": "c2fbbe4a-4ba0-4945-808b-67454605a4cf", "duplicate_score": 2, "geospatial_topic": [], "id": "a2e1621d-7740-458d-82f8-a0115a4b40fb", "isopen": false, "language": "eng", "license_id": "notspecified", "license_title": "notspecified", "maintainer": null, "maintainer_email": null, "metadata_created": "2025-10-17T04:18:05.109709", "metadata_modified": "2025-11-19T08:35:59.886324", "name": "spatial-variations-in-lead-isotopes-tasman-element-eastern-australia", "notes": "Lead isotope data from ore deposits and mineral occurrences in the Tasman Element of eastern Australia have been used to construct isotopic maps of this region. These maps exhibit systematic patterns in parameters derived from isotope ratios. The parameters include \u03bc (238U/204Pb), as calculated using the Cumming and Richards (1975) lead evolution model, and the difference between true age of mineralisation and the Cumming and Richards lead isotope model age of mineralisation (\u0394t).\nVariations in \u03bc coincide with boundaries at the orogen, subprovince and zone scales. The boundary between the Lachlan and New England orogens is accompanied by a decrease in \u03bc, and within the Lachlan Orogen, the Central Subprovince is characterised by \u03bc that is significantly higher than in the adjacent Eastern and Western subprovinces. Within the Eastern Subprovince, the Cu-Au-rich Macquarie Arc is characterised by significantly lower \u03bc relative to adjacent rocks.\nThe Macquarie Arc is also characterised by very high \u0394t (generally above 200 Myr). Other regions characterised by very high \u0394t include western Tasmania, the southeastern New England Orogen, and the Hodgkinson Province in northern Queensland. These anomalies are within a broad pattern of decreasing \u0394t from east to west, with Paleozoic deposits within or adjacent to Proterozoic crust characterised by \u0394t values of 50 Myr or below.\nThe patterns in \u0394t are interpreted to reflect the presence of the two major tectonic components involved in the Paleozoic Tasman margin in Australia (cf., M\u00fcnker, 2000): subducting proto-Pacific crust (\u0394t >150 Myr), and Proterozoic Australia crust (\u0394t < 50 Myr) on the over-riding plate. Proterozoic Australia crustal sources are interpreted to dominate the western parts of the Tasman Element and Proterozoic crust further to the west, whereas Pacific crustal sources are inferred to characterise western Tasmania and much of the eastern part of the Tasman Element. Contrasts in \u0394t between the Cambrian Mount Read Volcanics in western Tasmania and similar aged rocks in western Victoria and New South Wales make direct tectonic correlation between these rocks problematic.", "num_resources": 3, "num_tags": 5, "organization": {"id": "91f054ec-d0c3-4d42-a89a-5daa2c7a6818", "name": "geoscience-australia-data", "title": "Geoscience Australia Data", "type": "organization", "description": "Harvester for Geoscience Australia Data", "image_url": "", "created": "2025-06-23T12:29:08.024111", "is_organization": true, "approval_status": "approved", "state": "active"}, "original_harvest_source": {"site_url": "https://ecat.ga.gov.au", "href": "https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/spatial-variations-in-lead-isotopes-tasman-element-eastern-australia", "title": "Geoscience Australia"}, "owner_org": "91f054ec-d0c3-4d42-a89a-5daa2c7a6818", "private": false, "promotion_level": "0", "spatial": "{\"type\": \"Polygon\", \"coordinates\": [[[138.8671982288361, -45.08902799019728], [156.4453232288361, -45.08902799019728], [156.4453232288361, -9.102086144989329], [138.8671982288361, -9.102086144989329], [138.8671982288361, -45.08902799019728]]]}", "spatial_coverage": "{\"type\": \"Polygon\", \"coordinates\": [[[138.8671982288361, -45.08902799019728], [156.4453232288361, -45.08902799019728], [156.4453232288361, -9.102086144989329], [138.8671982288361, -9.102086144989329], [138.8671982288361, -45.08902799019728]]]}", "state": "active", "temporal_coverage_from": "2025-11-14 05:21:58.906+00", "title": "Spatial variations in lead isotopes, Tasman Element, eastern Australia", "type": "dataset", "unpublished": false, "url": null, "version": null, "extras": [{"key": "harvest_object_id", "value": "816cab6c-c97f-412a-9d02-60f62819fc1d"}, {"key": "harvest_source_id", "value": "00080910-39e7-408f-882c-e6e1eb6baadb"}, {"key": "harvest_source_title", "value": "Geoscience Australia"}], "resources": [{"cache_last_updated": null, "cache_url": null, "created": "2025-11-19T08:35:59.927201", "datastore_active": false, "datastore_contains_all_records_of_source_file": false, "description": "Download the Record (docx)", "format": "DOCX", "hash": "", "id": "342e74f2-3c89-46e2-b46b-d22bce5ec6f5", "last_modified": null, "metadata_modified": "2025-11-19T08:35:59.897356", "mimetype": "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "mimetype_inner": null, "name": "Download the Record (docx)", "package_id": "a2e1621d-7740-458d-82f8-a0115a4b40fb", "position": 0, "resource_locator_function": "", "resource_locator_protocol": "WWW:LINK-1.0-http--link", "resource_type": null, "size": null, "state": "active", "url": "https://d28rz98at9flks.cloudfront.net/110383/Rec2017_009.docx", "url_type": null, "zip_extract": false}, {"cache_last_updated": null, "cache_url": null, "created": "2025-11-19T08:35:59.927207", "datastore_active": false, "datastore_contains_all_records_of_source_file": false, "description": "Download the Record (pdf)", "format": "PDF", "hash": "", "id": "a167e322-5ca5-441e-992a-9ca202e825f2", "last_modified": null, "metadata_modified": "2025-11-19T08:35:59.897511", "mimetype": "application/pdf", "mimetype_inner": null, "name": "Download the Record (pdf)", "package_id": "a2e1621d-7740-458d-82f8-a0115a4b40fb", "position": 1, "resource_locator_function": "", "resource_locator_protocol": "WWW:LINK-1.0-http--link", "resource_type": null, "size": null, "state": "active", "url": "https://d28rz98at9flks.cloudfront.net/110383/Rec2017_009.pdf", "url_type": null, "zip_extract": false}, {"cache_last_updated": null, "cache_url": null, "created": "2025-11-19T08:35:59.927209", "datastore_active": false, "datastore_contains_all_records_of_source_file": false, "description": "Download Appendix B (xlsx)", "format": "XLSX", "hash": "", "id": "8f9322aa-d521-4ac8-a3a8-2dfc74ffac43", "last_modified": null, "metadata_modified": "2025-11-19T08:35:59.897616", "mimetype": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "mimetype_inner": null, "name": "Download Appendix B (xlsx)", "package_id": "a2e1621d-7740-458d-82f8-a0115a4b40fb", "position": 2, "resource_locator_function": "", "resource_locator_protocol": "WWW:LINK-1.0-http--link", "resource_type": null, "size": null, "state": "active", "url": "https://d28rz98at9flks.cloudfront.net/110383/Rec2017_009_Appendix_B.xlsx", "url_type": null, "zip_extract": false}], "tags": [{"display_name": "Earth Sciences", "id": "40d58e59-cdeb-4021-9e5a-aae60edebdf5", "name": "Earth Sciences", "state": "active", "vocabulary_id": null}, {"display_name": "Published_External", "id": "5178775c-8044-4b7f-881f-5428a4e2d925", "name": "Published_External", "state": "active", "vocabulary_id": null}, {"display_name": "lead isotopes", "id": "0760eb9a-da8f-457e-ad9f-634c9543991e", "name": "lead isotopes", "state": "active", "vocabulary_id": null}, {"display_name": "metallogeneis", "id": "4ba82279-3fb8-4f39-a228-d38eb4d741f4", "name": "metallogeneis", "state": "active", "vocabulary_id": null}, {"display_name": "tectonics", "id": "d61c3f66-59d0-4967-ad91-40821851942d", "name": "tectonics", "state": "active", "vocabulary_id": null}], "groups": [], "relationships_as_subject": [], "relationships_as_object": []}}