Given the high eruption recurrence in the Michoacán-Guanajuato volcanic field (MGVF) in central Mexico, the birth of a new monogenetic volcano can be expected in the future. It is important, therefore, to reconstruct the past eruptions of its many different volcanoes, including estimates of lava flow emplacement times and their rheological properties. These studies define the range of possible future eruptive scenarios and are necessary to evaluate potential risk. The Rancho Seco monogenetic volcano, located in the central part of the MGVF (19°37′03”N, 101°28′21”W), was radiocarbon-dated at ~27,845 years BP. Its eruption initiated with a violent-Strombolian phase that produced a scoria cone and was followed by the effusion of at least seven associated andesitic lava flows, reflecting drastic changes in the eruptive dynamics. Effusive activity probably involved decreases in the magma ascent and discharge rates linked to efficient degassing in an open system. Lava chemical composition suggest an origin of partial melting of a subduction-modified hydrated heterogenous mantle wedge and textural and mineralogical analysis indicates significant crystal fractionation and minor assimilation of granodioritic basement rocks. High-resolution LiDAR imagery was used to estimate lava flow viscosities and emplacement times by following a morphology-based methodology. Results indicate that lava flow viscosities ranged from 10⁵ to 10⁹ Pa·s and emplacement durations between 32 and 465 days for the flow units considered (F5 and F6). The entire eruption may have lasted from 2 to 6 years with a mean effusion rate of 4 to 15 m³/s. Our results are also pertinent to archaeologists studying the architectural remains of Angamuco, a large urban pre-Hispanic site built on Rancho Seco's lava flows.

鉴于墨西哥中部米却肯州-瓜纳华托州火山场（MGVF）的喷发高发，预计将来会出现新的单系火山。因此，重要的是重建其许多不同火山的过去喷发，包括对熔岩流进位时间及其流变特性的估计。这些研究确定了未来可能发生的爆发情况的范围，对于评估潜在风险是必要的。位于MGVF（19°37′03” N，101°28′21” W）中部的兰乔塞科（Rancho Seco）单基因火山在约BP 27845年被放射性碳定年。它的喷发始于强烈的Strombolian相，产生了火山灰锥，随后至少喷出了七种相关的安第斯山脉熔岩流，反映了喷发动力的剧烈变化。喷射活动可能涉及岩浆上升的减少和与开放系统中有效脱气有关的排放速率。熔岩的化学成分表明，俯冲作用修饰的水合非均质地幔楔发生部分熔融的起源，并且组织学和矿物学分析表明，花岗二叠纪基底岩石具有明显的晶体分馏和较小的同化作用。通过遵循基于形态学的方法，高分辨率LiDAR图像用于估算熔岩流粘度和沉积时间。结果表明，熔岩流的粘度范围为10 熔岩的化学成分表明，俯冲作用修饰的水合非均质地幔楔发生部分熔融的起源，并且组织学和矿物学分析表明，花岗二叠纪基底岩石具有明显的晶体分馏和较小的同化作用。通过遵循基于形态学的方法，高分辨率LiDAR图像用于估算熔岩流粘度和沉积时间。结果表明，熔岩流的粘度范围为10 熔岩的化学成分表明，俯冲作用修饰的水合非均质地幔楔发生部分熔融的起源，并且组织学和矿物学分析表明，花岗二叠纪基底岩石具有明显的晶体分馏和较小的同化作用。通过遵循基于形态学的方法，高分辨率LiDAR图像用于估算熔岩流粘度和沉积时间。结果表明，熔岩流的粘度范围为10 对于所考虑的流量单位（F5和F6）为⁵至10 ⁹ Pa·s，放置时间为32至465天。整个喷发可能持续了2至6年，平均积液速率为4至15 m ³ / s。我们的结果也与考古学家研究Angamuco的建筑遗迹有关，Angamuco是在Rancho Seco的熔岩流上建造的大型西班牙前城市遗址。