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首页> 外文期刊>Quaternary geochronology >Dating late Holocene lava flows in Pico de Orizaba (Mexico) by means of in situ-produced cosmogenic Cl-36, lichenometry and dendrochronology
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Dating late Holocene lava flows in Pico de Orizaba (Mexico) by means of in situ-produced cosmogenic Cl-36, lichenometry and dendrochronology

机译：通过原位产生的宇宙中的CL-36，性状计量和树枝状学约会在Pico de Orzaba（墨西哥）在Pico de Orzaba（墨西哥）进行约会。

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The knowledge of the eruptive history of volcanic centers allows for improving the evaluation of the related risks and hazards in populated areas, but substantially depends on the ability of dating the lava flows. However, traditional methods such as U-Th/He, Ar-40-Ar-39, K-40-Ar-40 and radiocarbon dating are not always suitable. Therefore, an alternative approach based on the combination of in situ-produced Cl-36 based cosmic ray exposure dating, lichenometry and dendrochronology was tested on two lava flows (called Lava flow "A" and "B") from Pico de Orizaba (Mexico), previously attributed to 16th and 17th century eruptions, respectively. The presented results show that both lava flows are significantly older than their assumed 16th and 17th century ages. Regarding lava flow "A", the measured in situ-produced Cl-36 concentrations lead to a mean age of 3.03 +/- 0.70 ka, while dendrochronology and lichenometry yield minimum ages of 834 and 1130 years, respectively. Regarding lava flow "B", the measured in situ-produced Cl-36 concentrations lead to a mean age of 1.45 +/- 0.35 ka, whereas lichenometry gives a minimum age of similar to 1000 years. Overall, this demonstrates that the combination of in situ-produced Cl-36 based cosmic ray exposure dating, lichenometry and dendrochronology has a considerable potential for dating purposes on young deposits and landforms, in particular on lava flows at high elevation sites.
机译：对火山中心爆发史的了解允许改善人口稠密地区的相关风险和危害的评估，但基本上取决于约会熔岩流动的能力。然而，如U-TH / HE，AR-40-AR-39，K-40-AR-40和RadioCarbon约会的传统方法并不总是合适的。因此，在两个熔岩流（称为熔岩流“A”和“B”）上测试了基于原位产生的CL-36基础的宇宙射线暴露约会，结合测定法和树突状的组合的替代方法（称为熔岩流“和”B“）（墨西哥）以前分别归因于16世纪和17世纪的爆发。所展示的结果表明，熔岩流量都比假定的16世纪和17世纪年龄较大。关于熔岩流“a”，测量的原位产生的Cl-36浓度导致平均年龄为3.03 +/- 0.70 ka，而分支结构和性状计量分别产生834和1130岁。关于熔岩流“B”，原位产生的CL-36浓度的测量导致平均年龄为1.45 +/- 0.35ka，而性状计量给出最低年龄的年龄与1000岁。总的来说，这表明原位产生的CL-36基于宇宙射线暴露约会，性状测定法和树突汇的组合具有相当大的幼儿和地形上的约会目的潜力，特别是在高海拔地点的熔岩流动。

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