CentAm & IBM Geochem Database version 1.02

The CentAm & IBM Geochem Database version 1.02 consists of high-quality geochemical data collected over the last two decades from the magmatic arcs of the two NSF MARGINS Subduction Factory focus sites: 1) the Central America (CentAm) arc system, including Costa Rica, Nicaragua, El Salvador, and Guatemala; 2) and the Izu-Bonin-Mariana (IBM) arc system, extending from Japan to Guam. The CentAm and IBM arc systems were chosen for this project because they represent two end members of subduction factories. CentAm has a high sediment input and a young, hot, dry subducting slab. The IBM system has a low sediment input and an old, cold, wet subducting slab. This data was filtered and compiled to explore the magma characteristics of the respective arcs and to interpret their magmagenetic conditions such as sediment input, fluid-flux, and mantle and altered oceanic crustal components. To create the database, volcanic geochemical data for whole rock samples was downloaded from the EarthChem data portal (www.earthchem.org) (managed by the Lamont-Doherty Earth Observatory of Columbia University). Four datasets are included in separate worksheets within the Excel® workbook, which include separate major and trace element datasets for CentAm and IBM. Each dataset contains metadata for each sample and major and trace element, isotope, and calculated normative mineral compositions. The workbook also contains an explanation of methods and a list of data references. Supplemental documents include a detailed explanation of the datasets and filter processes and an EndNote® library text file.

《中美洲与IBM地球化学数据库》版本1.02汇集了在过去二十年间，从美国国家科学基金会MARGINS俯冲工厂重点研究区域的两大地幔弧系——中美洲弧系（包括哥斯达黎加、尼加拉瓜、萨尔瓦多和危地马拉）以及伊豆-小笠原-马里亚纳弧系（从日本至关岛）——所收集的高质量地球化学数据。该数据库选取中美洲与IBM弧系，因其分别代表了俯冲工厂的两个极端类型。其中，中美洲弧系具有较高的沉积物输入和年轻、热、干燥的俯冲板块；IBM弧系则具有较低的沉积物输入和古老、冷、湿润的俯冲板块。该数据经筛选与汇编，旨在探究各自弧系的岩浆特征及其岩浆地质条件，如沉积物输入、流体通量、地幔以及改造过的洋壳成分。数据库的构建通过从地球化学数据门户（www.earthchem.org，由哥伦比亚大学拉蒙特-道奇地球观测站管理）下载火山地球化学数据完成。Excel®工作簿中包含四个独立的数据集工作表，分别针对中美洲与IBM弧系的主要和微量元素进行详细记录。每个数据集均包含样本及主要和微量元素、同位素和计算出的规范矿物组成的相关元数据。工作簿还附有方法说明和数据参考文献列表。补充文件包括对数据集和筛选过程的详细解释以及EndNote®图书馆文本文件。