RU_CAGeochem v.2, a database and sample repository for Central American volcanic rocks at Rutgers University

Abstract: We present version 2 of a database for Central American volcanic rocks and related components. The Rutgers University Central American Geochemical data (RU_CAGeochem) includes the active volcanoes related to the Cocos-Caribbean convergent plate boundary that extends from Guatemala to Costa Rica in Central America. The RU prefix signifies that the data and/or samples are primarily from the long-term Central American research project started at Dartmouth College in 1970 and continued at Rutgers University between 1974 to the present. The database is decidedly uneven because of the impressive improvement of analytical techniques during the period of sample and data production. Further complications arise because most of the sampling and analysis were part of the educational process for many different undergraduate and graduate students using different types of instruments. This note presents, as a reasonably coherent whole, geochemical data and metadata for about 1325 samples collected by at least 40 students and colleagues. Many new Sr, Nd and Pb isotopic ratios are included here but most of the new data are metadata that provide greatly improved descriptions of the locations and status of the samples as well as estimates of data quality.

Version 2 includes updated, more precise geocoordinates, and additional descriptive metadata: Lcode, Unit, and Relative position that allow definition of units (Lcode, Unit) and stratigraphic position.

Other Description: Carr, M. J., Feigenson, M. D., Bolge, L. L., Walker, J. A. and Gazel, E. (2014), RU_CAGeochem, a database and sample repository for Central American volcanic rocks at Rutgers University. Geoscience Data Journal.

摘要：本研究介绍中美洲火山岩及相关组分数据库的第二版。鲁特格斯大学中美洲地球化学数据集（RU_CAGeochem）涵盖了与科科斯-加勒比汇聚板块边界相关的活火山，该边界从中美洲的危地马拉延伸至哥斯达黎加。RU前缀表明，本数据集的数据及/或样品主要源自1970年始于达特茅斯学院、1974年起由鲁特格斯大学延续至今的长期中美洲研究项目。鉴于样品与数据采集期间分析技术实现了显著进步，本数据库存在显著的不均衡性。此外，多数采样与分析工作均为数十名使用不同类型仪器的本科及研究生的教学实践内容，进一步加剧了数据集的复杂性。本数据集以相对连贯的整体形式，呈现了至少40名学生及合作者采集的约1325件样品的地球化学数据与元数据。本版新增了大量Sr、Nd、Pb同位素比值数据，其中多数新增内容为元数据，可大幅优化样品位置、状态的描述，并实现数据质量评估。

第二版新增了更新且精度更高的地理坐标，以及Lcode、Unit、Relative position三类描述性元数据，可用于定义样品单元（Lcode、Unit）与地层位置。

其他说明：Carr, M. J.、Feigenson, M. D.、Bolge, L. L.、Walker, J. A. 及Gazel, E.（2014），《RU_CAGeochem：鲁特格斯大学中美洲火山岩数据库与样品库》，《地球科学数据期刊》（Geoscience Data Journal）。