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Reassessment of the eruptive chronology of El Metate shield volcano (central-western Mexico) based on a comprehensive rock-magnetic, paleomagnetic and multi-approach paleointensity survey
Quaternary Geochronology ( IF 2.7 ) Pub Date : 2019-10-04 , DOI: 10.1016/j.quageo.2019.101031
Nayeli Pérez-Rodríguez , Juan Morales , Marie-Noëlle Guilbaud , Avto Goguitchaichvili , Rubén Cejudo-Ruiz , María del Sol Hernández-Bernal

We study seven out of the thirteen lava flows associated to El Metate shield volcano using paleomagnetic, absolute intensity and rock-magnetic experiments. Characteristic paleomagnetic directions were successfully determined from most of the flows. A combined mean direction of D = 346.4° and I = 32.1° (N = 34, R = 33.73, k = 121.74, α95 = 2.2) was obtained for the early flows (Flow 1 − Flow 3). Flow 6a (a flow from the late emplacement stage) yielded a statistically distinguishable mean paleomagnetic direction of D = 359.2° and I = 29.6° (N = 9, R = 8.97, k = 294.6, α95 = 3.0).

Furthermore, the significant between-flow variation of absolute paleointensity values obtained using two different methodologies, which resembles the trend followed by that of the global model SHA. DIF 14k intensity curve for the period 1000 AD 1600 AD, disagrees with previous hypothesis supporting a short emplacement period between 50 and 100 years for the whole sequence. Additionally, paleodirectional and paleointensity dating of the studied flows allowed to refine the eruptive chronology indicating that early flows were produced over a short time period, whereas at least two of the later flows were erupted 200 years later; the activity ending just prior to the arrival of the Spaniards in ∼1520. Under these circumstances, and in light of the presented high quality paleomagnetic and paleointensity data, the assumed monogenetic nature of El Metate volcano seems to be questionable.



中文翻译:

基于全面的岩磁,古磁和多途径古强度调查,重新评估埃尔梅塔特盾构火山(墨西哥中西部)的喷发年表

We study seven out of the thirteen lava flows associated to El Metate shield volcano using paleomagnetic, absolute intensity and rock-magnetic experiments. Characteristic paleomagnetic directions were successfully determined from most of the flows. A combined mean direction of D = 346.4° and I = 32.1° (N = 34, R = 33.73, k = 121.74, α95 = 2.2) was obtained for the early flows (Flow 1 − Flow 3). Flow 6a (a flow from the late emplacement stage) yielded a statistically distinguishable mean paleomagnetic direction of D = 359.2° and I = 29.6° (N = 9, R = 8.97, k = 294.6, α95 = 3.0).

此外,使用两种不同的方法获得的绝对古强度值的显着流间变化,类似于趋势,随后是全局模型SHA的趋势。DIF 14k强度曲线在1000 AD 1600 AD期间与先前的假设不一致,该假设支持整个序列在50到100年之间的短安置期。此外,对研究流的古方向和古强度测年可以完善喷发年代,表明早期流是在短时间内产生的,而至少两个后期流是在200年后喷发的。活动在西班牙人到1520年左右之前结束。在这种情况下,并根据提出的高质量古磁和古强度数据,

更新日期:2019-10-04
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