Major element glass data of marine tephras from sediment core M141/1_1236-1

A total of 44 gravity cores were collected in the Azores region in 2017, during the R/V Meteor cruise M141/1. Based on their length, content in tephra layers, and spatial distribution around São Miguel, 22 cores have been carefully selected as the most representative to gain insights on the volcanic history and the depositional marine environment around the islands of the eastern group of the archipelago. In total, 454 samples from 350 ash- or pumice/scoria/lapilli- bearing horizons were examined. Here we present the major element glass data of the Pleistocene to Holocene marine tephra record around the eastern islands of the Azores. Marine lapilli samples were cleaned in an ultrasonic bath and then crushed. All ash samples and the previously crushed lapilli samples were wet-sieved into different grain size fractions. The 125-63 microns fraction was embedded with epoxy in pre-drilled acrylic mounts and polished for geochemical micro-analyses. Major and minor element compositions of glass shards were conducted using a JEOL JXA 8200 wavelength dispersive EMP at GEOMAR Helmholtz-Centre for Ocean Research, Kiel, Germany. […]

2017年，在R/V Meteor号科考船M141/1航次期间，于亚速尔群岛区域共采集44个重力岩心。为深入了解该群岛东部岛屿群的火山历史及周边海洋沉积环境，基于岩心长度、火山灰层含量及圣米格尔岛周边空间分布特征，精心筛选出22个最具代表性的岩心。研究共分析了350个含火山灰或浮石/火山渣/火山砾层位中的454个样本。本文呈现的是亚速尔群岛东部岛屿周边更新世至全新世海洋火山灰记录的主量元素玻璃数据。海洋火山砾样本经超声波浴清洗后粉碎；所有火山灰样本及已粉碎的火山砾样本通过湿筛分为不同粒度级分。125-63微米级分用环氧树脂嵌入预钻孔丙烯酸底座并抛光，以用于地球化学微分析。玻璃碎屑的主量及微量元素组成分析在德国基尔GEOMAR亥姆霍兹海洋研究中心完成，采用JEOL JXA 8200波长色散电子探针（Electron Microprobe, EMP）。