Laacher See revisited: High-spatial-resolution zircon dating indicates rapid formation of a zoned magma chamber

Schmitt, Axel K.

doi:10.1130/g22533a.1

Cited by 10 publications

(18 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This age overlaps within uncertainty with the U-Th isochron age for zircons from early erupted Laacher See differentiated phonolite and late-crystallized zircons in vesicles of carbonate-free syenite ejecta clasts (17.1±1.3 ka; Schmitt, 2006). Laacher See (Germany) erupted a suite of crystal-rich xenolithic clasts that range from carbonate-free intermediate (dominantly syenitic) compositions to carbonatites (sövites).…”

Section: Zircon U-th Ages From Laacher See Indicate Coeval Crystallizsupporting

confidence: 59%

Goldschmidt Abstracts 2007- S

Шилобреева¹,

Martínez

2007

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Section: Zircon U-th Ages From Laacher See Indicate Coeval Crystallizsupporting

confidence: 59%

Goldschmidt Abstracts 2007- S

Шилобреева¹,

Martínez

2007

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…DR1 in the GSA Data Repository 1 ) from two leucocratic xenoliths erupted as blocks from a Pleistocene cinder cone located on the northwestern portion of Mauna Kea's summit (described by Fodor, 2001), and ten leucocratic xenoliths from several Holocene basalt lavas and tephra cones located along the summit of Hualalai. Analyses followed the protocols and conditions described by Reid et al (1997) and Schmitt (2006). To assess the nature of the melts from which the zircons grew, we analyzed zircon-hosted glass and mineral inclusions (Fig.…”

Section: Methods and Samplesmentioning

confidence: 99%

Plutonic xenoliths reveal the timing of magma evolution at Hualalai and Mauna Kea, Hawaii

Shamberger

Hammer

2007

Geol

View full text Add to dashboard Cite

Hawaiian volcanoes evolve through stages that have been delimited by the compositions of their erupted lavas. New in situ 238 U-230 Th and U-Pb dating of single zircons from leucocratic plutonic xenoliths erupted at Mauna Kea and Hualalai volcanoes, Hawaii, reveals that important episodes of magmatic evolution are not necessarily refl ected in the stratigraphy or compositions of erupted lavas. Zircons from Mauna Kea diorites form a heterogeneous population with apparently bimodal ages of ca. 125 ka and ca. 65 ka, suggesting fractionation, intrusion, and crystal recycling about the time of transition of postshield volcanism from basaltic to hawaiitic compositions. Hualalai syenogabbros and diorites record extreme fractionation and generation of alkalic magma at 41 ± 9 ka and 261 ± 28 ka, indicating that alkalic magma was generated ~130,000 yr before the shield to postshield transition inferred from lava stratigraphy, and that coeval evolution of chemically distinct magma reservoirs at shallow and deep levels may have characterized the shield stage. These episodes at Hualalai did not cause eruption of evolved lavas, indicating that extreme differentiation in Hawaiian volcanoes is not necessarily followed by eruption of highly evolved magma.

show abstract

“…Together with U‐Th data delimiting the initial 230 Th/ 232 Th of their host magma [ Condomines , ], Puy de Dome zircon yield an isochron age of 10.1 ± 2.1 ka (n = 9, 95% confidence), which is indistinguishable from the thermal ionization mass spectrometry U‐Th age of 12.1 ± 1.0 ka reported for bulk zircon separate [ Condomines , ], and a SIMS age of 14.8 ± 2.4 [ Schmitt et al ., ]. Laacher See zircon yields an isochron age of 17.2 ± 3.1 ka (n = 14, 95% confidence), which is indistinguishable from the SIMS isochron age of 17.1 ± 2.6 ka reported by Schmitt [].…”

Section: Geochronologic Techniquesmentioning

confidence: 99%

EpisodicHolocene eruption of theSaltonButtes rhyolites,California, from paleomagnetic,U‐Th, andAr/Ar dating

Wright

Vazquez

Champion

et al. 2015

Geochem Geophys Geosyst

View full text Add to dashboard Cite

In the Salton Trough, CA, five rhyolite domes form the Salton Buttes: Mullet Island, Obsidian Butte, Rock Hill, North and South Red Hill, from oldest to youngest. Results presented here include 40Ar/39Ar anorthoclase ages, 238U‐230Th zircon crystallization ages, and comparison of remanent paleomagnetic directions with the secular variation curve, which indicate that all domes are Holocene. 238U‐230Th zircon crystallization ages are more precise than but within uncertainty of 40Ar/39Ar anorthoclase ages, suggesting that zircon crystallization proceeded until shortly before eruption in all cases except one. Remanent paleomagnetic directions require three eruption periods: (1) Mullet Island, (2) Obsidian Butte, and (3) Rock Hill, North Red Hill, and South Red Hill. Borehole cuttings logs document up to two shallow tephra layers. North and South Red Hills likely erupted within 100 years of each other, with a combined 238U‐230Th zircon isochron age of: 2.83 ± 0.60 ka (2 sigma); paleomagnetic evidence suggests this age predates eruption by hundreds of years (1800 cal BP). Rock Hill erupted closely in time to these eruptions. The Obsidian Butte 238U‐230Th isochron age (2.86 ± 0.96 ka) is nearly identical to the combined Red Hill age, but its Virtual Geomagnetic Pole position suggests a slightly older age. The age of aphyric Mullet Island dome is the least well constrained: zircon crystals are resorbed and the paleomagnetic direction is most distinct; possible Mullet Island ages include ca. 2300, 5900, 6900, and 7700 cal BP. Our results constrain the duration of Salton Buttes volcanism to between ca. 5900 and 500 years.

show abstract

Laacher See revisited: High-spatial-resolution zircon dating indicates rapid formation of a zoned magma chamber

Cited by 10 publications

References 24 publications

Goldschmidt Abstracts 2007- S

Goldschmidt Abstracts 2007- S

Plutonic xenoliths reveal the timing of magma evolution at Hualalai and Mauna Kea, Hawaii

EpisodicHolocene eruption of theSaltonButtes rhyolites,California, from paleomagnetic,U‐Th, andAr/Ar dating

Contact Info

Product

Resources

About