Australian Proterozoic Large Igneous Provinces GIS Dataset

The Australian Proterozoic Large Igneous Provinces GIS Dataset is designed for display at a nominal
1:5 000 000 scale, showing the time-space distribution of Proterozoic Large Igneous Provinces (LIPs) in Australia. Large Igneous Provinces are relatively rare magmatic events distinguished by exceptionally large volumes of mafic dominated magma emplaced over short geological periods of a few millions years or less. Five major LIPs have been recognised, or proposed, so far in Australia, beginning with the ~1780 Ma Hart LIP, followed by the ~1210 Ma Marnda Moorn LIP, the ~1070 Ma Warakurna LIP, the ~825 Ma Gairdner LIP, and the ~510 Ma Kalkarindji LIP. The early Cambrian Kalkarindji LIP is included in this Proterozoic compilation because of its size and importance. Only the youngest two of these LIPs (Gairdner and Kalkarindji) are established as comagmatic provinces based on both time correlation and geochemical equivalence. The other proposed LIPs (Hart, Marnda Moorn and Warakurna) are based on time equivalence alone. For further information on the five proposed Proterozoic LIPs refer to the guide to using the map of Australian Proterozoic Large Igneous Provinces (Geoscience Australia Record 2009/44).

Earlier released extracts include two pdf maps of Australian Proterozoic Large Igneous Provinces and an accompanying Geoscience Australia Record. This release presents the Australian Proterozoic Large Igneous Provinces as a GIS dataset and it should be used in conjunction with the Australian Mafic Ultramafic Magmatic Events GIS Dataset released by Geoscience Australia in 2014 (http://www.ga.gov.au/metadata-gateway/metadata/record/82166/). This file geodatabase that contains points, lines and polygons representing mafic and ultramafic rocks in Australia which have been placed in a magmatic event framework in time and space, primarily based on geochronological data. Together, these datasets provide comprehensive information on the evolution of mafic-ultramafic magmatism associated with the Australian continent, and will be of interest to explorers in the search of magmatic ore deposits of nickel, platinum-group elements, chromium, titanium, and vanadium.

澳大利亚元古代大火成岩省地理信息系统（Geographic Information System，以下简称GIS）数据集标称比例尺为1:500万，用于展示澳大利亚境内元古代大火成岩省（Large Igneous Provinces，以下简称LIPs）的时空分布特征。大火成岩省属于较为罕见的岩浆事件，其典型特征为在短短数百万年甚至更短的地质时限内，有巨量以镁铁质为主的岩浆侵位。

截至目前，澳大利亚境内已识别或提出存在5处主要的大火成岩省，依次为约1780 Ma的哈特大火成岩省、约1210 Ma的曼达穆恩大火成岩省、约1070 Ma的瓦拉库纳大火成岩省、约825 Ma的盖尔德纳大火成岩省，以及约510 Ma的卡尔卡林吉大火成岩省。考虑到其规模与重要性，早寒武世的卡尔卡林吉大火成岩省被纳入本次元古代数据集汇编。其中仅最年轻的两处大火成岩省（盖尔德纳与卡尔卡林吉）可通过时间相关性与地球化学等效性被确定为同岩浆省，其余已提出的大火成岩省（哈特、曼达穆恩及瓦拉库纳）仅基于时间等效性得出。如需了解这5处元古代大火成岩省的详细信息，请参阅《澳大利亚元古代大火成岩省地图使用指南》（澳大利亚地质科学局（Geoscience Australia）报告2009/44号）。

此前发布的衍生数据包括两份澳大利亚元古代大火成岩省PDF格式地图，以及配套的澳大利亚地质科学局报告。本次发布的数据集以地理信息系统格式呈现澳大利亚元古代大火成岩省相关数据，需与澳大利亚地质科学局2014年发布的《澳大利亚镁铁质-超镁铁质岩浆事件地理信息系统数据集》（http://www.ga.gov.au/metadata-gateway/metadata/record/82166/）配套使用。本文件地理数据库包含点、线、面要素，用于表征澳大利亚境内的镁铁质与超镁铁质岩石，这些岩石已基于年代学数据被纳入时空统一的岩浆事件框架中。

上述两类数据集可全面提供与澳大利亚大陆相关的镁铁质-超镁铁质岩浆作用演化信息，可为寻找镍、铂族元素、铬、钛及钒等岩浆型矿床的勘探人员提供重要参考。