Zircon U-Pb geochronology and trace element dataset from the Southern Rocky Mountain Volcanic Field, Colorado, USA

This contribution provides in-situ LA-ICP-MS U-Pb ages and trace element determinations of zircons from dacitic to rhyolitic lavas, ignimbrites and intrusions in the Southern Rocky Mountain Volcanic Field (SRMVF) in Colorado, USA. The data record a period of intense magmatic activity in the Oligocene-early Miocene (~37-22 Ma) which gave rise to some of the largest explosive ignimbrites in the geological record (e.g. the Fish Canyon Tuff). Age data are drift corrected, but not corrected for radiation dosage or Th disequilibrium, in order to allow users to apply their own algorithms. Xenocrysts (much older crystals up to 2 Ga from the Proterozoic basement) are included in this record.

本研究提供了美国科罗拉多州南落基山火山岩区（SRMVF）内英安质至流纹质熔岩、熔结凝灰岩及侵入岩中锆石的原位激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）铀-铅（U-Pb）年龄与微量元素测定数据。这些数据记录了渐新世-早中新世（约37-22 Ma）期间一段强烈的岩浆活动期，该时期形成了地质记录中规模最大的爆炸性熔结凝灰岩（如Fish Canyon凝灰岩）。年龄数据已进行漂移校正，但未针对辐射剂量或钍不平衡进行校正，以便用户应用各自的算法。本数据集包含捕虏晶（Xenocrysts），即来自元古代基底、年龄可达20亿年的古老晶体。