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Dating of young (<1 Ma) tephras: Using U‐Pb (zircon) and (U‐Th[‐Sm])/He (zircon, apatite, magnetite) chronometers to unravel the eruption age of a tephra in the Woodlark Rift of Papua New Guinea
Terra Nova ( IF 2.4 ) Pub Date : 2020-04-16 , DOI: 10.1111/ter.12464
Jürgen E. Österle 1 , Daniel F. Stockli 2 , Diane Seward 1 , Timothy A. Little 1
Affiliation  

The dating of volcanic tephras forms a critical cornerstone of chronostratigraphy and is paramount for the resolution of the geological timescale. (U‐Th[‐Sm])/He dating is an emerging tool in Quaternary tephrochronology and ideally suited to date tephras <1 Ma. We present zircon, magnetite and apatite (U‐Th[‐Sm])/He combined with zircon U‐Pb data for a Pleistocene tephra in syn‐rift strata of the Woodlark Rift in Papua New Guinea. The results reveal a young He age mode (~0.5 to 0.8 Ma), consistent with an autocrystic zircon U‐Pb crystallisation age of 0.8 ± 0.1 Ma, as well as a broad range of older (U‐Th[‐Sm])/He (~1.6 to 10.2 Ma) and U‐Pb (~4.4 to 107 Ma) ages. These data demonstrate the potential of integrated U‐Pb and (U‐Th[‐Sm])/He multi‐method chronometry for dating the youngest coherent age mode, detecting contaminant grains and evaluating the isotopic systematics of these techniques.

中文翻译:

幼小(<1 Ma)特弗拉斯的约会:使用U‐Pb(锆石)和(U–Th [‐Sm])/ He(锆石,磷灰石,磁铁矿)天文钟来解开伍德拉克裂谷中特弗拉的喷发年龄。巴布亚新几内亚

火山特非拉斯的年代形成是年代地层学的重要基石,对于解析地质时标至关重要。(U‐Th [‐Sm])/他定年法是第四纪年代学中的一种新兴工具,非常适合于年龄小于1 Ma的日期色母。我们提供了锆石,磁铁矿和磷灰石(U‐Th [‐Sm])/ He以及锆石U‐Pb数据,用于巴布亚新几内亚Woodlark裂谷同裂谷地层中的更新世特非拉。结果显示年轻的He年龄模式(〜0.5至0.8 Ma),与锆石U-Pb的自晶结晶年龄0.8±0.1 Ma相一致,并且年龄范围较大(U-Th [-Sm])/他(〜1.6至10.2 Ma)和U-Pb(〜4.4至107 Ma)年龄。这些数据证明了集成的U-Pb和(U-Th [-Sm])/ He多方法计时码表可用于确定最年轻的相干年龄模式,
更新日期:2020-04-16
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