Tephra from Deep Sea Drilling Project Leg 66: Middle America Trench Transect (Southern Mexico)

Cadet, Jean Paul; Thisse, Y.; Pouclet, André; Bardintzeff, Jacques-Marie; Stephan, J.-F.

doi:10.2973/dsdp.proc.66.131.1982

Cited by 13 publications

(14 citation statements)

References 12 publications

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“…SiO 2 typological boundaries are defined by Pecerillo and Taylor (1976) and are slightly modified for Rd, as in Cadet et al, 1982. count times and a defocused beam. In agreement with several authors (cf., Cadet et al, 1981 and1982), we suggest that hydration explains the greatest part of the analytical deficit. Because the deficit is independent of sample age, the hydration must have occurred at the time of deposition.…”

Section: Chemical Composition Of Glass Shardsmentioning

confidence: 77%

“…Positive correlation of alkalis with SiO 2 is generally linked to magmatic differentiation in calc-alkaline trends; the scatter perpendicular to this direction, following a negative correlation, is larger than the sampling variation (glass heterogeneity) and analytical drift. This spread shows the existence of several magmatic trends with different alkalinity, as in Legs 66 and 67 (Cadet et al, 1981 and1982). Because potassium is classically the element used in the distinction of calc-alkaline lines, we separated the data into three groups-A, B, and C-on the SiO 2 /K 2 O diagram (Fig.…”

Section: Magmatic Characterizationmentioning

confidence: 99%

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Ash Layers from Deep Sea Drilling Project Leg 84: Middle America Trench Transect

Pouclet¹,

Cadet²,

Fujioka³

et al. 1985

Initial Reports of the Deep Sea Drilling Project

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Three Leg 84 sites provided a good record of explosive volcanism onshore (in Central America). Ash layers and many ashy pods are interbedded in Recent to Oligocene strata. Evidence of the main periods of activity was noted in Recent to upper Pleistocene, Pliocene-Pleistocene, lower Pliocene to upper Miocene, lower Miocene, and upper Oligocene. Noticeable traces of older volcanism were found in upper Eocene strata.The chemical analyses of glass shards show a dacitic to rhyolitic composition with a low to moderate calc-alkalinity. A preliminary distinction of samples in three geochemical groups according to their K 2 O/SiO 2 contents is done to test a magmatic evolution. Comparisons are made with Leg 67 and on-land data.

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Section: Chemical Composition Of Glass Shardsmentioning

confidence: 77%

Section: Magmatic Characterizationmentioning

confidence: 99%

Ash Layers from Deep Sea Drilling Project Leg 84: Middle America Trench Transect

Pouclet¹,

Cadet²,

Fujioka³

et al. 1985

Initial Reports of the Deep Sea Drilling Project

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“…Many scientists assume that the record of explosive volcanic activity on land can be read, with certain limitations, in the distribution of ash in deep-sea sediments (Donnelly, 1974;Kennett and Thunell, 1975;Ninkovich and Donn, 1976;Cadet and Fujioka, 1980;Cadet et al, 1981 andPouclet et al, 1985a and1985b).…”

Section: Explosive Volcanism Recordmentioning

confidence: 99%

“…Acidic glasses partly belong to the same series, but also to the shoshonitic series. A schematic separation giving three categories, lowpotassium (A), medium-potassium (B), and high-potassium (C) was determined, using volcanic ashes of Central America from Legs 66, 67, and 84 (Cadet et al, 1981(Cadet et al, , 1982Pouclet et al, 1985a). The glasses from Leg 112 are more alkalic and more potassic.…”

Section: Chemical Compositions Of Glassesmentioning

confidence: 99%

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Volcanic Ash from Leg 112 off Peru

Pouclet¹,

Cambray²,

Cadet³

et al. 1990

Proceedings of the Ocean Drilling Program

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A history of violence: magma incubation, timing and tephra distribution of the Los Chocoyos supereruption (Atitlán Caldera, Guatemala)

León

Schindlbeck-Belo

Kutterolf

et al. 2021

J Quaternary Science

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The climactic Los Chocoyos (LCY) eruption from Atitlán caldera (Guatemala) is a key chronostratigraphic marker for the Quaternary period given the extensive distribution of its deposits that reached both the Pacific and Atlantic Oceans. Despite LCY tephra being an important marker horizon, a radioisotopic age for this eruption has remained elusive. Using zircon (U-Th)/He geochronology, we present the first radioisotopically determined eruption age for the LCY of 75 ± 2 ka. Additionally, the youngest zircon crystallization 238 U-230 Th rim ages in their respective samples constrain eruption age maxima for two other tephra units that erupted from Atitlán caldera, W-Fall (130 +16 / −14 ka) and I-Fall eruptions (56 +8.2 / −7.7 ka), which under-and overlie LCY tephra, respectively. Moreover, rim and interior zircon dating and glass chemistry suggest that before eruption silicic magma was stored for >80 kyr, with magma accumulation peaking within ca. 35 kyr before the LCY eruption during which the system may have developed into a vertically zoned magma chamber. Based on an updated distribution of LCY pyroclastic deposits, a new conservatively estimated volume of~1220 ± 150 km 3 is obtained (volcanic explosivity index VEI > 8), which confirms the LCY eruption as the first-ever recognized supereruption in Central America.

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Tephra from Deep Sea Drilling Project Leg 66: Middle America Trench Transect (Southern Mexico)

Cited by 13 publications

References 12 publications

Ash Layers from Deep Sea Drilling Project Leg 84: Middle America Trench Transect

Ash Layers from Deep Sea Drilling Project Leg 84: Middle America Trench Transect

Volcanic Ash from Leg 112 off Peru

A history of violence: magma incubation, timing and tephra distribution of the Los Chocoyos supereruption (Atitlán Caldera, Guatemala)

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