The Colombian geochronological database (CGD)

Geochronological databases are powerful tools for characterizing the crustal evolution and the age spectra of a region and allow comparison with other areas at a regional scale. In this contribution, we present the Colombian Geochronological Database (CGD), which contains a curated compilation of ca. 67,406 individual published U-Th-Pb, K-Ar, Ar-Ar, Rb-Sr, Sm-Nd, Lu-Hf, Fission-track, U-Th-He, and Re-Os mineral and whole rock ages that are reported in the published literature. Each date includes geographic coordinates, geological setting, petrologic and chemical information extracted from the respective publications. The structure of the database provides a powerful interface for constructing queries and allows searching and extracting information on geographic domains, provinces, stratigraphic units, isotopic systems, date interpretations, references, etc. This information establishes a framework for regional and global geological interpretations with geochronological, stratigraphic, structural and palaeogeographic implications. With the present effort we present to the geoscience community a clear insight, from a regional perspective, to the geology and tectonics of Colombia since Precambrian times. The comparison of all (detrital and magmatic) single zircon U-Pb dates from the Colombian (Gondwana sourced) geochronological database with the Global and North American (Laurentia sourced) databases provides a temporal constraint on the evolution of the South American continent. U-Pb zircon ages in Colombia define 13 peak clusters centred at 1767, 1530, 1325, 1178, 1007, 605,540, 468, 271, 237, 182, 76 and 10 Ma but of those, only few have a good correlation in all three databases: 1007 (Grenvillian/Orinoquian/Putumayo Orogeny), 605 (Braziliano/Pan-African Orogeny), 468 (Famatinian/Taconic Orogeny), and 182 Ma (Break-up of Pangea) zircon peaks. This correlation suggests that some tectonic events in Colombia are global and might represent crustal production and preservation while the other peaks might just represent local arc magmatic events.地质年代学数据库是刻画区域地壳演化与年龄谱的有力工具，可支持区域尺度下与其他区域开展对比。本文报道了哥伦比亚地质年代学数据库（Colombian Geochronological Database, CGD），该库整理收录了约67406条已发表的单矿物与全岩测年数据，涵盖U-Th-Pb、K-Ar、Ar-Ar、Rb-Sr、Sm-Nd、Lu-Hf、裂变径迹、U-Th-He以及Re-Os等多种同位素体系。每条年代数据均包含从对应文献中提取的地理坐标、地质背景、岩石学与地球化学信息。该数据库构建了功能强大的查询接口，可实现针对地理区域、构造单元、地层单元、同位素体系、年代解释、参考文献等维度的检索与信息提取，可为区域乃至全球的地质解释提供框架，兼具年代学、地层学、构造学与古地理学研究价值。本工作从区域视角出发，为地学界呈现了哥伦比亚自前寒武纪以来的地质与构造演化全貌。将该数据库（源自冈瓦纳大陆）中所有碎屑与岩浆成因的单锆石U-Pb年代数据，与全球及北美（源自劳伦大陆）数据库进行对比，可为南美大陆的演化提供时间约束。哥伦比亚的锆石U-Pb年龄可划分为13个峰值簇，中心年龄分别为1767、1530、1325、1178、1007、605、540、468、271、237、182、76与10 Ma；其中仅4个峰值在三个数据库中均具有良好相关性：1007 Ma（对应格林威尔/奥里诺科/普图马约造山运动）、605 Ma（对应巴西利亚/泛非造山运动）、468 Ma（对应法马蒂纳/塔科尼克造山运动）以及182 Ma（对应泛大陆裂解）的锆石峰值。该相关性表明，哥伦比亚的部分构造事件具有全球性，可能代表了全球范围的地壳形成与保存过程，而其余峰值则可能仅代表区域性的弧岩浆事件。