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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Emplacement temperature resolution and age determination of Cerro Colorado tuff ring by paleomagnetic analysis, El Pinacate Volcanic Field, Sonora, Mexico
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Emplacement temperature resolution and age determination of Cerro Colorado tuff ring by paleomagnetic analysis, El Pinacate Volcanic Field, Sonora, Mexico

机译：墨西哥塞诺拉El Pinacate火山场古磁分析的塞罗科罗拉多凝灰岩环的温度分辨率和年龄​​确定

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摘要

The lithic in the Cerro Colorado tephra deposits is dominated by clasts from shallow country rocks for a diatreme not well mixed, or, by a combination of material that reflects the relative proportions of country rock in a wellmixed diatreme. The clasts in a tephra ring bed might be ideal to use the paleomagnetic study to determine the emplacement temperature. We report emplacement temperature ranges of pyroclastic lithic fragments from the Cerro Colorado Tuff Ring in the El Pinacate Volcanic Field, Sonora, northwestern Mexico. Paleomagnetic analyses, particularly the thermoremanent magnetization procedure was carried out in 38 small cores, drilled from the 10 to 30 cm in size lithic fragments. It estimates the emplacement temperature ranges of the juvenile basaltic cauliflower bombs and not-juvenile diverse blocks produced in the phreatomagmatic eruption. Titanomagnetite and titanohematite are the main magnetic carriers, along with titanomaghemite. The 22 emplacement temperatures determined in this study are grouped in three temperature ranges, low (310-370 degrees C), medium (400-460 degrees C) and high (500 degrees C). The low and medium temperature samples show two or more components, while the high temperature samples have, in general, only one component. This wide range of emplacement temperature could be related to the composite thermal history of the pyroclastic material incorporated in the water saturated pyroclastic flow deposit. The comparison of the mean direction of the secondary magnetization component with the secular variation curve of the global model SHA.DIF.14, suggests an age of 3915 +/- 59 yr. BP. (C) 2018 Elsevier B.V. All rights reserved.
机译：塞罗科罗拉多特非拉火山岩中的石块主要由来自浅层乡村岩石的碎屑（对于混合得不好的话）占主导地位，或者由反映混合后的乡村岩石中相对比例的乡村岩石的材料组成。特非拉环形床中的碎屑可能是使用古磁研究确定位置温度的理想选择。我们报告了墨西哥西北部索诺拉州El Pinacate火山场中Cerro Colorado Tuff环的火山碎屑岩碎屑的进位温度范围。在38个小岩心中进行了古磁分析，特别是热剩余磁化过程，这些小岩心从10到30 cm大小的岩屑中钻出。它估计了在玄岩岩浆喷发过程中产生的幼稚玄武岩花椰菜炸弹和非幼稚的各种生物的定位温度范围。钛磁铁矿和钛赤铁矿以及钛磁赤铁矿是主要的磁性载体。在这项研究中确定的22个进位温度分为三个温度范围，低（310-370摄氏度），中（400-460摄氏度）和高（> 500摄氏度）。低温和中温样品显示两种或多种成分，而高温样品通常仅包含一种成分。如此宽的位置温度可能与掺入水饱和热碎屑流沉积物中的热碎屑材料的复合热历史有关。次级磁化分量的平均方向与整体模型SHA.DIF.14的长期变化曲线的比较表明年龄为3915 +/- 59岁。 BP。 （C）2018 Elsevier B.V.保留所有权利。

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