BACKGROUND With the continuous accumulation of data resources around the world, the application of data visualization has become more urgent, and the methods of data visualization have also shown diversified characteristics. Data visualization is a scientific and technical research on the visual representation of data, which studies how to display relatively obscure data visually in a real and accurate way, to vividly and intuitively express the information and rules contained in the data. Literature is an important carrier of knowledge dissemination, with systematic characteristics, continuity, a large quantity and fast update, and is an important source of information. The visualization research of literature is of great significance to the dissemination of knowledge. At present, the visualization research of document data is mostly combined with the bibliometric analysis method, which visualizes the relationship between documents in the form of a scientific knowledge map. The application of this technology and method has played an important role in mining the information and rules contained in document data, but it is slightly insufficient in the spatial attribute mining of document data, which requires in-depth research in this field.

OBJECTIVES To provide new solutions for expanding the application of literature data in the field of spatial visualization, thereby further enhancing the usable value of literature data.

METHODS GIS technology was used to carry out the research on the spatial visualization method of document data, excavate the common content features and spatial features of document data, and gather the structured document data of a certain volume of spatial feature information to lay the data foundation for the visualization research. At the same time, the combination point between GIS technology and document data was studied, and the strategy and technical route for information mining and spatial visualization of document data were formed. Taking the data of more than 140 Re-Os isotope dating documents published since 2015 to 2020 as an example, the application test of this technical method was carried out. A Re-Os isotope data visualization service system with a five-tier architecture including layers of support, data, service, application and user has been developed, to realize the spatial visualization application of Re-Os isotope dating document data results.

RESULTS The results show that: (1) The study area contains more than 140 ore producing areas that carried out Re-Os isotope dating research from 2015 to 2020, covering the eastern, central, and western regions of China. (2) There are 19 main minerals in the study area, mainly copper (29.0%), molybdenum (28.3%), tungsten (12.4%) and gold (11.0%). (3) There are 12 kinds of detection objects, and the proportion of molybdenite as the detection object is 80.7%, which indicates that molybdenite is still the preferred research object of the Re-Os isotope dating method, which is inseparable from the high Re/Os value of molybdenite. (4) The detection age falls in the lower age range of 0-200Ma, accounting for 62.1% of the ore-producing areas, which are mainly distributed in the northeast and southeast regions of China, indicating that the Re-Os isotope ages in the eastern region are concentrated in the Mesozoic era, which is consistent with the existence of large-scale Mesozoic mineralization events in the eastern region of China. The ore-producing area in the age range above 200Ma accounts for 37.9%, which is mainly distributed in the central and western regions of China, indicating that the Re-Os isotope ages in the central and western regions are concentrated before the Mesozoic era and have the characteristics of multiple mineralization.

CONCLUSIONS The research shows that the document data visualization technology and method proposed in this paper can be used to excavate the spatial characteristics of the document data, expand the application of the document data in the field of spatial visualization, and solve the problems of how to analyze and extract the common information of the document data, locate the spatial feature information, and realize the spatial visualization technology. In terms of revealing important target areas, key research minerals and main application technologies, it can provide spatial visualization information, and provide reference for finding the hot spots and difficulties of current metallogenic chronology research.