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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The age of the Neapolitan Yellow Tuff caldera-forming eruption (Campi Flegrei caldera - Italy) assessed by ~(40)Ar/~(39)Ar dating method
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The age of the Neapolitan Yellow Tuff caldera-forming eruption (Campi Flegrei caldera - Italy) assessed by ~(40)Ar/~(39)Ar dating method

机译：〜（40）Ar /〜（39）Ar测年法评估那不勒斯黄凝灰岩火山口形成爆发的年龄（Campi Flegrei火山口-意大利）

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The Neapolitan Yellow Tuff (NYT) is the product of the largest known trachytic phreatoplinian eruption. It covered an area larger than 1000 km~2 with an estimated volume of about 40 km~3 of erupted magma. During the course of the eruption a caldera collapsed within the previously formed Campanian Ignimbrite caldera. The resulting nested structure strongly influenced the following volcanic activity in the Campi Flegrei caldera. As previous dating of the NYT does not converge toward a unique result, a new set of ~(40)Ar/~(39)Ar age determinations has been carried out to better constrain the age of the eruption. Two variants of the ~(40)Ar/~(39)Ar dating method were applied to determine the age of the NYT eruption: (1) single-crystal total fusion (SCTF), on an individual phenocryst of feldspar, and (2) laser incremental heating (LIH), on bulk aliquots of feldspar phenocrysts. The results of the SCTF analyses show that the overall sample weighted mean age, derived from the conventional age calculation, is 15.6 +- 0.8 ka. A weighted mean of the isochron age is 15.3 +- 1.2 ka (2σ), and has been assumed as the best indicator of age to be derived from the SCTF analyses. The LIH analyses results show that plateau ages vary from 15.4 +- 0.5 to 14.5 +- 0.5 ka. The overall weighted mean age of the isochron results is 14.9 +- 0.4 ka (2σ). This result has been assumed as the reference age for the NYT eruption, and agrees with the SCTF age. The new age obtained for the NYT deposits is of great relevance for the understanding of the evolution and the present state of the Campi Flegrei caldera and collocates the NYT in a crucial stratigraphical position to date the climatic oscillations that occurred between the Late Glacial and the Holocene.
机译：那不勒斯黄凝灰岩（NYT）是已知的最大的曲张性血小板生成素爆发的产物。它覆盖了一个大于1000 km〜2的区域，估计有大约40 km〜3的喷出岩浆。在喷发过程中，破火山口在先前形成的Campanian Ignimbrite破火山口内塌陷。最终的嵌套结构强烈影响了Campi Flegrei破火山口的随后火山活动。由于以前对NYT的约会不能收敛到一个独特的结果，因此已经进行了一组新的〜（40）Ar /〜（39）Ar年龄测定，以更好地限制喷发的年龄。 〜（40）Ar /〜（39）Ar测年方法的两个变体被用于确定NYT喷发的年龄：（1）在长石的一个单独的长晶石上的单晶全融合（SCTF），和（2） ）激光增量加热（LIH），对长石隐晶的大部分等分试样。 SCTF分析的结果表明，从常规年龄计算得出的总样本加权平均年龄为15.6±0.8 ka。等时年龄的加权平均值为15.3±1.2 ka（2σ），并被认为是从SCTF分析得出的最佳年龄指标。 LIH分析结果表明，高原年龄从15.4±0.5到14.5±0.5 ka不等。等时线结果的总加权平均年龄为14.9±0.4 ka（2σ）。该结果已假定为NYT爆发的参考年龄，并且与SCTF年龄一致。 NYT沉积物获得的新年龄对于了解Campi Flegrei破火山口的演化和当前状态具有重要意义，并且使NYT处于重要的地层位置，以追溯到晚冰川期和全新世之间发生的气候振荡。 。

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