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  • 1
    Book
    Book
    From Maars to Scoria Cones : the enigma of monogenetic volcanic fields ; [the Third International Maar Conference (3IMC) in Malargüe, Argentina, in April 2009 ... a conference held in Morelia, Mexico in late September - early October 2009 on the occasion of the 250th anniversary of the Jorullo scoria cone eruption (see also Jorullo 250th Anniversary Workshop - Monogenetic Volcanism in the Trans-Mexican Volcanic Belt and elsewhere: a Multidisciplinary International Volcanological Congress to Commemorate the 250th Anniversary of Volcán Jorullo's Birth in Michoacán, México] (2011)
    Amsterdam [u.a.] : Elsevier
    Details Availability
    Keywords: Konferenzschrift
    Type of Medium: Book
    Pages: 411 S. , Ill., graph. Darst., Kt.
    Series Statement: Journal of volcanology and geothermal research 201.2011,1/4
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Morphology and emplacement of an unusual debris-avalanche deposit at Jocotitlán volcano, Central Mexico (1992)
    Springer
    Bulletin of volcanology 54 (1992), S. 573-589 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A pre-historic collapse of the northeastern flank of Jocotitlán Volcano (3950 m), located in the central part of the Trans Mexican Volcanic Belt, produced a debris-avalanche deposit characterized by surficial hummocks of exceptional size and conical shape. The avalanche covered an area of 80 km2, had an apparent coefficient of friction (H/L)_of 0.11, a maximum runout distance of 12 km, and an estimated volume of 2.8 km3. The most remarkable features of the Jocotitlán debris avalanche deposit are: the several steep (29–32°) conical proximal hummocks (up to 165 m high), large tansverse ridges (up to 205 m high and 2.7 km long) situated at the base of the volcano, and the steep 15–50 m thick terminal scarp. Proximal conical hummocks and parallel ridges that can be visually fitted back to their pre-collapse position on the mountain resulted from a sliding mode of emplacement. Steep primary slopes developed as a result of the accumulation of coarse angular clasts at the angle of repose around core clasts that are decameters in size. Distal hummocks are commonly smaller, less conical, and clustered with more diffuse outlines. Field evidence indicates that the leading distal edge of the avalanche spilled around certain topographic barriers and that the distal moving mass had a yield strength prior to stopping. In the NE sector, the avalanche was suddenly confined by topographically higher lacustrine and volcaniclastic deposits which as a result were intensely thrust-faulted, folded, and impacted by large clasts that separated from the avalanche front. Post-emplacement loading also induced normal faulting of these soft, locally water-rich sediments. The regional tectonic pattern, N-NE direction of flank failure, and the presence of a major normal fault which intersects the volcano and is parallel to the orientation of the Acambay graben located 10 km to the N suggest a genetic relationship between the extensional tectonic stress regime and triggering of catastrophic slope failure. The presence of a 3-m-thick sequence of pumice and obsidian-rich pyroclastic surge and fall tephra directly overlying the debris-avalanche deposit indicates that magma must have been present within the edifice just prior to the catastrophic flank failure. The breached crater left by the avalanche has mostly been filled by dacitic domes and lava flows. The youngest pryroclastic surge deposits on the upper flanks of the volcano have an historical C14 age of 680±80 yearsBp (Ad 1270±80). Thus Jocotitlán volcano, formerly believed to be extinct, should be considered potentially active. Because of its close proximity to Mexico-City (60 km), the most populous city in the world, reactivation could engender severe hazards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00569941
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Volcanology The giant Popocatépetl stirs (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 227-227 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ...On 30 June, Popocatépetl showered ash over Mexico City, about 72km away, in its largest eruption since 1927. This comes after a few years of increasing activity, which could conceivably be the precursor of a huge eruption. Popocatépetl, a 5,452-metre-high volcano, is in one of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388227a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Metal-residence sites in lavas and tuffs from Volcán Popocatépetl, Mexico: implications for metal mobility in the environment (1998)
    Springer
    Environmental geology 33 (1998), S. 197-208 
    Details
    ISSN: 1432-0495
    Keywords: Key words Metals ; Sulfides ; Vapor-phase crystallization ; Cu ; Arc volcano ; Volcanic emissions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Volcan Popocatépetl is a Quaternary stratovolcano located 60 km southeast of Mexico City. The summit crater is the site of recent ash eruptions, excess degassing, and dacite dome growth. The modern cone comprises mainly pyroclastic flow deposits, airfall tephras, debris flows, and reworked deposits of andesitic composition; it is flanked by more mafic monogenetic vents. In least-degassed fallout tuffs and mafic scoria, transition metals are concentrated in phases formed before eruption, during eruption, and after eruption. Preeruptive minerals occur in both lavas and tephra, and include oxides and sulfides in glass and phenocrysts. The magmatic oxides consist of magnetite, ilmenite, and chromite; the sulfides consist of both (Fe,Ni)1-xS (MSS) and Cu–Fe sulfide (ISS). Syn- and posteruptive phases occur in vesicles in both lavas and tephra, and on surfaces of ash and along fractures. The mineral assemblages in lavas include Cu–Fe sulfide and Fe–Ti oxide in vesicles, and Fe sulfide and Cu–Fe sulfide in segregation vesicles. Assemblages in vesicles in scoria include Fe–Ti oxide and rare Fe–Cu–Sn sulfide. Vesicle fillings of Fe–Ti oxide, Ni-rich chromite, Fe sulfide, Cu sulfide, and barite are common to two pumice samples. The most coarse-grained of the vesicle fillings are Cu–Fe sulfide and Cu sulfide, which are as large as 50 μ in diameter. The youngest Plinian pumice also contains Zn(Fe) sulfide, as well as rare Ag–Cu sulfide, Ag–Fe sulfide, Ag bromide, Ag chloride, and Au–Cu telluride. The assemblage is similar to those typically observed in high-sulfidation epithermal mineralization. The fine-grained nature and abundance of syn- and/or posteruptive phases in porous rocks makes metals susceptible to mobilization by percolating fluids. The abundance of metal compounds in vesicles indicates that volatile exsolution prior to and/or during eruption played an important role in releasing metals to the atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050238
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  • 5
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    The significance on volcanic ash for the surface ocean iron budget and phytoplankton growth (2008)
    In:  [Talk] In: International Association of Volcanology and Chemistry of the Earths Interior (IAVCEI) Meeting, 17.08.-22.08, Reykjavik, Iceland .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 6
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    Radiocarbon ages of Holocene Pelado, Guespalapa, and Chichinautzin scoria cones, south of Mexico-City: implications for archaeology and futrue hazards (2004)
    Springer
    In:  Bulletin of Volcanology, 66 . pp. 203-225.
    Details
    Publication Date: 2018-09-03
    Description: Pelado, Guespalapa, and Chichinautzin monogenetic scoria cones located within the Sierra del Chichinautzin Volcanic Field (SCVF) at the southern margin of Mexico City were dated by the radiocarbon method at 10,000, 2,800–4,700, and 1,835 years b.p., respectively. Most previous research in this area was concentrated on Xitle scoria cone, whose lavas destroyed and buried the pre-Hispanic town of Cuicuilco around 1,665±35 years b.p. The new dates indicate that the recurrence interval for monogenetic eruptions in the central part of the SCVF and close to the vicinity of Mexico City is 〈2,500 years. If the entire SCVF is considered, the recurrence interval is 〈1,700 years. Based on fieldwork and Landsat imagery interpretation a geologic map was produced, morphometric parameters characterizing the cones and lava flows determined, and the areal extent and volumes of erupted products estimated. The longest lava flow was produced by Guespalapa and reached 24 km from its source; total areas covered by lava flows from each eruption range between 54 (Chichinautzin) and 80 km2 (Pelado); and total erupted volumes range between 1 and 2 km3/cone. An average eruption rate for the entire SCVF was estimated at 0.6 km3/1,000 years. These findings are of importance for archaeological as well as volcanic hazards studies in this heavily populated region.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00445-003-0304-z
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Surface ocean iron fertilization: the role of subduction zone and hotspot volcanic ash and fluxes into the Pacific Ocean (2011)
    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 25 . GB4001.
    Details
    Publication Date: 2019-09-23
    Description: Surface ocean iron (Fe) fertilization can affect the marine primary productivity (MPP), thereby impacting on CO2 exchanges at the atmosphere-ocean interface and eventually on climate. Mineral (aeolian or desert) dust is known to be a major atmospheric source for the surface ocean biogeochemical iron cycle, but the significance of volcanic ash is poorly constrained. We present the results of geochemical experiments aimed at determining the rapid release of Fe upon contact of pristine volcanic ash with seawater, mimicking their dry deposition into the surface ocean. Our data show that volcanic ash from both subduction zone and hot spot volcanoes (n = 44 samples) rapidly mobilized significant amounts of soluble Fe into seawater (35–340 nmol/g ash), with a suggested global mean of 200 ± 50 nmol Fe/g ash. These values are comparable to the range for desert dust in experiments at seawater pH (10–125 nmol Fe/g dust) presented in the literature (Guieu et al., 1996; Spokes et al., 1996). Combining our new Fe release data with the calculated ash flux from a selected major eruption into the ocean as a case study demonstrates that single volcanic eruptions have the potential to significantly increase the surface ocean Fe concentration within an ash fallout area. We also constrain the long-term (millennial-scale) airborne volcanic ash and mineral dust Fe flux into the Pacific Ocean by merging the Fe release data with geological flux estimates. These show that the input of volcanic ash into the Pacific Ocean (128–221 × 1015 g/ka) is within the same order of magnitude as the mineral dust input (39–519 × 1015 g/ka) (Mahowald et al., 2005). From the similarity in both Fe release and particle flux follows that the flux of soluble Fe related to the dry deposition of volcanic ash (3–75 × 109 mol/ka) is comparable to that of mineral dust (1–65 × 109 mol/ka). Our study therefore suggests that airborne volcanic ash is an important but hitherto underestimated atmospheric source for the Pacific surface ocean biogeochemical iron cycle.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2009GB003761
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  • 8
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    Geochemistry, Sr-Nd isotope composition, and tectonic setting of Holocene Pelado, Guespalapa, and Chichinautzin scoria cones, south of Mexico-City (2004)
    Elsevier
    In:  Journal of Volcanology and Geothermal Research, 130 . pp. 197-226.
    Details
    Publication Date: 2017-08-18
    Description: Holocene Pelado, Guespalapa and Chichinautzin monogenetic scoria cones and associated lava flows located within the Sierra del Chichinautzin Volcanic Field (SCVF) at the southern margin of Mexico City were mapped and sampled for mineralogical and chemical analyses. With the exception of Parı́cutin volcano in western Mexico, few scoria cones in the Trans-Mexican Volcanic Belt have ever been sampled in greater detail. Chemical analyses of rocks indicate that mafic products (e.g. Guespalapa and Chichinautzin) from individual volcanoes in the Sierra del Chichinautzin are characterized by substantial chemical variability, whereas high-silica andesite volcanoes (e.g. Pelado) are very uniform in composition. These findings have important bearings for regional tephrochronology. As a whole, rock compositions form a continuous coherent calc–alkaline suite, explicable by polybaric fractional crystallization±assimilation associated with successive stagnation at different depths along the ascent path. Trace element and Sr–Nd isotope analyses point toward a 〈1-km-scale heterogeneous (enriched/depleted) mantle wedge underneath the SCVF. The recently proposed plume-origin for these rocks is not in accord with our data. Instead, magma origin is discussed in relation to the tectonically complex subduction process of the oceanic Cocos Plate underneath the continental North American Plate.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0377-0273(03)00289-0
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Chemical determination of the Jorullo volcano in the Michoacán Guanajuato Volcanic Field (MGVF), Mexico (2017)
    PANGAEA
    In:  Supplement to: Rasoazanamparany, Christine; Widom, Elisabeth; Siebe, Claus; Guilbaud, M N; Spicuzza, Michael J; Valley, John W; Valdez, G; Salinas, S (2016): Temporal and compositional evolution of Jorullo volcano, Mexico: Implications for magmatic processes associated with a monogenetic eruption. Chemical Geology, 434, 62-80, https://doi.org/10.1016/j.chemgeo.2016.04.004
    Details
    Publication Date: 2023-01-13
    Description: The 1759-1774 eruption of the Jorullo volcano in the Michoacán Guanajuato Volcanic Field (MGVF), Mexico, produced lavas that range in composition from basalt to basaltic andesite. We have conducted new major and trace element and isotopic studies (whole rock Sr-Nd-Pb-Hf-Os, and O isotopes in olivine separates) of the Jorullo lavas and tephras spanning the duration and compositional range of the eruption, to further constrain the potential roles of mantle source heterogeneity, subduction-related metasomatism, and crustal assimilation in the petrogenesis of the Jorullo magmas. This study presents the first Hf, high precision Pb and comprehensive oxygen isotope measurements for Jorullo volcanic rocks. All samples have arc-like trace element patterns with enrichments in large ion lithophile elements (e.g. Ba, Rb, and Pb) and depletions in fluid immobile elements (e.g. Nb, Ta). In addition, the samples show variations in 87Sr/86Sr (0.7038-0.7040), 143Nd/144Nd (0.51280-0.51285), 176Hf/177Hf (0.28297-0.28300), 206Pb/204Pb (18.62-18.66), 207Pb/204Pb (15.57-15.59) and 208Pb/204Pb (38.34-38.43). Osmium isotope signatures are, with one exception, more radiogenic than the depleted and primitive mantle (187Os/188Os = 0.1231-0.1616). Oxygen isotope ratios of olivine phenocrysts (d18.OSMOW = 5.70-6.02 per mil) show limited variation, but are isotopically heavier than normal mantle olivine. The samples define two geochemical groups: high-MgO samples with higher 87Sr/86Sr, lower 143Nd/144Nd and 176Hf/177Hf, and a positive correlation of Sr and Pb isotopes; and low-MgO samples displaying lower 87Sr/86Sr but higher 143Nd/144Nd and 176Hf/177Hf than the former group, and a negative correlation of Sr and Pb isotopes. The high-MgO group comprises most of the early tephra and lavas, whereas the low-MgO group includes most of the late tephra and lavas. These compositional variations are inconsistent with shallow level contamination, but rather are interpreted to reflect mantle source heterogeneity. Trace element and isotopic signatures are consistent with North Mexican Extensional Province (NMEP) mantle metasomatised by subduction components composed of sediment- and oceanic crust-derived hydrous fluid. The temporal-compositional variations observed in Jorullo magmas are inferred to result from a combination of variable degrees of fractional crystallization of magmas produced by tapping a progressively less metasomatised mantle source that is vertically and/or laterally heterogeneous.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 10
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    (Appendix 2) Microprobe analysis of major and trace elements from the Jorullo volcano in the Michoacan Guanajuato Volcanic Field, Mexiko (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: -; Aluminium oxide; Calcium oxide; Chromium(III) oxide; Event label; Forsterite; Iron oxide, Fe2O3; Iron oxide, FeO; JOR-0609B; JOR-0721; JOR-0722; JOR-0733; JOR-0759; JOR-0760; JOR-0766; JOR-0766A; JOR-0766B; Magnesium oxide; Manganese oxide; Mexico; Microprobe; Nickel oxide; Sample comment; Sample ID; Silicon dioxide; Titanium dioxide; Total
    Type: Dataset
    Format: text/tab-separated-values, 2160 data points
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