Preliminary Construction and Application of DDE-database of Igneous Rocks

The 21st century is the era of big data, and the new scientific research paradigm and knowledge discovery driven by data and models has become a new trend in scientific field. In this paper, we introduce the DDE-database of igneous rocks constructed under the framework of Deep-time Digital Earth (DDE), an international big science program. The database is built based on the knowledge system of petrology with the idea of 'data+mapping+research', and includes a backend service (Cloud), a website (Web) and a scientific research work platform (Desktop). The main data come from published literatures, our team's data, laboratory analyzed data and the interconnection of international databases, which cover important orogenic belts, cratons and part of the oceans (IODP data) on the earth. In addition, 22 thematic databases of regional and special fields have been set up. The data are also available on the website and the research platform. The data type of this database include rock types, occurrence, spatial information, geological background, geochronology, geochemistry, (Sr-Nd-Hf-Pb-O) isotopes and non-traditional isotopes. Compared with the most widely used databases in the world, this database has such advantages as follows: (1) the design concept is based on 'data-mapping-research', with a platform for mapping and research; (2) more thematic databases are constructed, which attracts more expert participates and creates an advantage in some regions and fields (e.g., Central Asia Orogenic Belt, emerging isotopes, etc.); (3) most primarily data sets are enriched with geochronological, as well as longitude and latitude, seamlessly integrated with geographic map polygons; (4) the researchers can adjust their database structures in time according to new developments and demands, without writing new codes; (5) the powerful DDE platform can provide favorable suppuration for the interconnection and cooperation with international relevant databases. Based on the core data (geochronology, isotopes, etc.) of the DDE-database, research progress has been made in study of major geoscientific issues, such as the complex process of continental assemblage, crustal growth, and the compositional architecture and evolution of the deep Earth.