José Luis Arce

Bio: José Luis Arce is an academic researcher from National Autonomous University of Mexico. The author has contributed to research in topics: Volcano & Pyroclastic rock. The author has an hindex of 21, co-authored 74 publications receiving 1393 citations. Previous affiliations of José Luis Arce include Universidad Michoacana de San Nicolás de Hidalgo.

The 10.5 ka Plinian eruption of Nevado de Toluca volcano, Mexico: Stratigraphy and hazard implications

Abstract: During the late Pleistocene, a large Plinian eruption from Nevado de Toluca volcano produced a complex sequence of pyroclastic deposits known as the Upper Toluca Pumice. This eruption began with a phreatomagmatic phase that emplaced a hot pyroclastic flow (F0) on the east and northern flanks of the volcano. Eruption decompressed the magmatic system, almost immediately allowing the formation of a 25-km-high Plinian column that was dispersed by winds predominantly 70° to the northeast (PC0). Next, three other Plinian columns were dispersed in a northeast to east direction, reaching heights of 39, 42, and 28 km, resulting in fall layers (PC1, PC2, and PC3), respectively. These Plinian phases were interrupted several times by phreatomagmatic and collapse events that emplaced pyroclastic flows (F1, F2, and F3) and surges (S1 and S2), mainly on the eastern and northern flanks of the volcano. The eruption ended with the extrusion of a crystal-rich dacitic dome at the vent. The juvenile components of the Upper Toluca Pumice sequence are white, gray, and banded pumice, and gray lithic clasts of dacitic composition (63%–66% SiO2) and minor accidental lithic fragments. The fall deposits (PC1 and PC2) covered a minimum area of 2000 km2 and constitute a total estimated volume of 14 km3 (∼6 km3 DRE [dense-rock equivalent]). The mass eruption rate ranged from 3 × 107 to 5 × 108 kg/s, and total mass was 1.26 × 1013 kg. Charcoal found within Upper Toluca Pumice yielded an age of 10,500 14C yr B.P. (12,800–12,100 14C calibrated yr B.P.), somewhat younger than the earlier reported age of ca. 11,600 14C yr B.P. This new age for the pumice falls within the Younger Dryas cooling event. The eruption emplaced 1.5 m of pebble-sized pumice in the City of Toluca region and ∼50 cm of medium to fine sand in the Mexico City region. Distal lahar deposits derived from the Upper Toluca Pumice event incorporated mammoth bones and other mammals in the basin of Mexico. A future event of this magnitude would disrupt the lives of 30 million people now living in these cities and their surroundings.

Geology of Nevado de Toluca Volcano and surrounding areas, central Mexico

Abstract: Nevado de Toluca is an andesitic-dacitic stratovolcano of Pliocene-Holocene age located in central Mexico. The volcano is built on a complex sequence of metamorphic and sedimentary formations of Jurassic-Cretaceous age, rhyolitic ignimbrites of late Eocene age, and massive andesitic lava flows of late Miocene. In the northwest corner of the map area, on top of this basement sequence, a complex andesitic-dacitic stratovolcano, San Antonio, and a series of andesitic-dacitic domes and cones of Pliocene‐ early Pleistocene age were also built. The first andesitic-dacitic emissions of Nevado de Toluca occurred 2.6 Ma and continued during late Pleistocene‐Holocene time contemporarily with basaltic to dacitic emissions of the Chichinautzin Volcanic Field in the eastern parts of the map area. Volcanism in the area has been controlled by the interplay of three fault systems active since late Miocene. These systems, from older to younger, are the Taxco-Queretaro Fault System (NNW‐SSE), the San Antonio Fault System (NE‐SW), and the Tenango Fault System (E‐W). Nevado de Toluca was built at the intersection of these three fault systems, which have influenced its volcanic history as evidenced by at least three sector collapses and several large explosive eruptions. The Pliocene to Holocene volcanism at Nevado de Toluca and the late Pleistocene‐Holocene activity at Chichinautzin Volcanic Field, together with the regional tectonic activity and recent seismic swarms, suggest that the Tenango Fault System represents an active segment within the Trans-Mexican Volcanic Belt. The potential reactivation of either this fault system or Nevado de Toluca Volcano would pose earthquake and/or volcanic hazards to more than 25 million inhabitants in the vicinity, including large cities such as Toluca and Mexico.

Interpretation Theory in Applied Geophysics Grant (McGraw-Hill, 140s.)

Abstract: Interpretation theory in applied geophysics: Grant, F S ... Interpretation theory in applied geophysics Unknown Binding – January 1, 1965 5.0 out of 5 stars 1 rating. See all formats and editions Hide other formats and editions. The Amazon Book Review Book recommendations, author interviews, editors' picks, and more. Read it now. Enter your mobile number or email address below and we'll send you a ...

Vertically extensive and unstable magmatic systems: A unified view of igneous processes

Abstract: Volcanoes are an expression of their underlying magmatic systems. Over the past three decades, the classical focus on upper crustal magma chambers has expanded to consider magmatic processes throughout the crust. A transcrustal perspective must balance slow (plate tectonic) rates of melt generation and segregation in the lower crust with new evidence for rapid melt accumulation in the upper crust before many volcanic eruptions. Reconciling these observations is engendering active debate about the physical state, spatial distribution, and longevity of melt in the crust. Here we review evidence for transcrustal magmatic systems and highlight physical processes that might affect the growth and stability of melt-rich layers, focusing particularly on conditions that cause them to destabilize, ascend, and accumulate in voluminous but ephemeral shallow magma chambers.

Petrologic Reconstruction of Magmatic System Variables and Processes

Abstract: Explosive volcanic eruptions constitute a major class of natural hazard with potentially profound economic and societal consequences. Although such eruptions cannot be prevented and only rarely may be anticipated with any degree of accuracy, better understanding of how explosive volcanoes work will lead to improved volcano monitoring and disaster mitigation. A major goal of modern volcanology is linking of surface-monitored signals from active volcanoes, such as seismicity, ground deformation and gas chemistry, to the subterranean processes that generate them. Because sub-volcanic systems cannot be accessed directly, most of what we know about these systems comes from studies of erupted products. Such studies shed light on what happens underground prior to and during eruptions, thereby providing an interpretative framework for post hoc evaluation of monitoring data. The aim of this review is to present some of the current petrological techniques that can be used for studying eruptive products and for constraining key magmatic variables such as pressure, temperature, and volatile content. We first review analytical techniques, paying particular attention to pitfalls and strategies for analyzing volcanic samples. We then examine commonly used geothermometry schemes, evaluating each by comparison with experimental data not used in the original geothermometer calibrations. As there are few mineral-based geobarometers applicable to magma storage regions, we review other methods used to determine pre-eruptive magma equilibration pressures. We then demonstrate how petrologically-constrained parameters can be compared to the contemporaneous monitoring record. These examples are drawn largely from Mount St. Helens volcano, for which there are abundant petrological and monitoring data. However, we emphasize that our approaches can be applied to any number of active volcanoes worldwide. Finally, we illustrate the application of these techniques to two different types of magmatic systems—large silicic magma chambers and small intermediate-composition magma storage regions—with particular focus on the combined evolution of melt …