Hafnium, oxygen, neodymium, strontium, and lead isotopic constraints on magmatic evolution of the supereruptive southern Black Mountains volcanic center, Arizona, U.S.A.: A combined LASS zircon–whole-rock study

McDowell, Susanne M.; Fisher, Colleen; Frazier, William O.; Miller, Calvin F.; Miller, Jonathan S.; Economos, Rita C.

doi:10.2138/am-2016-5127

Cited by 11 publications

(2 citation statements)

References 71 publications

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“…The bulk-rock Hf isotopic composition of a single piece of pumice from the Hvítserkur ignimbrite was determined at the Radiogenic Isotope and Geochronology Laboratory (RIGL) at Washington State University (WSU, Pullman), using the RIGL-WSU Thermo Finnigan MC-ICP-MS and following methods described in detail by McDowell et al (2016). Analytical results were corrected for mass fractionation using 179 Hf/ 177 Hf = 0.7325 and normalized using Hf standard JMC-475 ( 176 Hf/ 177 Hf = 0.282160).…”

Section: Bulk-rock Hf Isotopesmentioning

confidence: 99%

Detrital zircon resolve longevity and evolution of silicic magmatism in extinct volcanic centers: A case study from the East Fjords of Iceland

et al. 2017

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Breiðuvík and Kaekjuskörð are two neighboring extinct eruptive centers in the East Fjords of Iceland. Together, they compose the second-largest volume of silicic rock in the country (after Torfajökull, an active volcanic system in southern Iceland). We use ages and compositions of detrital zircon collected from two rivers, the Stóraá and Krossá-Kaekjudalsá, to investigate the origins and longevity of silicic magmatism at Breiðuvík-Kaekjuskörð. Zircon populations from the two catchments have identical median U-Pb dates (12.9 Ma), O isotopes (δ 18 O Vienna standard mean ocean water = 3.1‰ versus 3.3‰), and Hf isotopes (ε Hf = 14.7). We interpret coherence of zircon elemental and isotopic compositions to indicate that a significant volume of relatively uniform silicic material was produced in close temporal and spatial proximity between 11.2 ± 0.7 Ma and 15.0 ± 0.9 Ma (all errors are 1σ), dominated by assimilation-fractional crystallization processes. To test the robustness of this longevity estimate, we applied Monte Carlo modeling to the Breiðuvík-Kaekjuskörð detrital zircon results and found the age span to be statistically resolvable at ≥2.8 m.y. While this lifespan is comparable to those of large mafic-silicic volcanic systems that have been described in other settings globally, it is the longest reported estimate for any Icelandic volcano, where typical longevity is thought to be ~0.5-1.5 m.y. The ≥2.8 m.y. lifespan we present for Breiðuvík-Kaekjuskörð is a conservative assessment, because the dates used in this study only represent the zircon-saturated period of magmatic activity. This study demonstrates that detrital zircon analysis of volcanigenic sediment provides an efficient and powerful tool that can illuminate histories of zircon-saturated magmatism at targeted volcanic centers and systems. This approach can be particularly valuable in dominantly mafic provinces where silicic material is subordinate (e.g., ocean islands, flood basalt provinces), where glaciation, erosion, or alteration has transformed the landscape, or in areas that are inaccessible (e.g., obscured by glacial ice). ., 2017, Detrital zircon resolve longevity and evolution of silicic magmatism in extinct volcanic centers: A case study from the

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Section: Bulk-rock Hf Isotopesmentioning

confidence: 99%

Detrital zircon resolve longevity and evolution of silicic magmatism in extinct volcanic centers: A case study from the East Fjords of Iceland

et al. 2017

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“…To assess the applicability of our model in alkaline igneous rocks, 26 samples from the Basin and Range from geochemical data (http://georoc.mpch-mainz.gwdg.de/georoc/, accessed on 29 August 2021, were selected [71][72][73][74][75][76][77][78][79][80][81] (Figure 14, Table 2). These data had SiO 2 ranging from 40.5 to 67.7 wt.% and M > 2, and all had the specified range of S20-2 and our model.…”

Section: Testing the Equationsmentioning

confidence: 99%

Estimating Magma Crystallization Temperatures Using High Field Strength Elements in Igneous Rocks

2022

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Indirect calculation of magma crystallization temperatures is an important subject for geologists to know the petrogenesis of igneous rocks. During magma evolution from generation to crystallization, several processes control the behavior of elements. In this research, we obtained two new methods for the thermometry of magma by using high field strength elements (HFSEs; Zr, Hf, Ce, Y, and Ti) abundances in igneous rocks. The first was T(K) = −15,993/(lnCZr + lnCHf −21.668), where CZr and CHf are the bulk-rock Zr and Hf contents in ppm, and T is the temperature in Kelvin. This equation was specially formulated to address metaluminous to peraluminous rocks with M < 2 [(Na + K + 2Ca)/(Al×Si)] (cation ratio) and SiO2 > 63 wt.%. The second was T(K) = −20,914/(ln(CHf + CY + CCe) + (ln(CZr/TiO2) − 31.153). CHf, CY, and CCe, and CZr are Hf, Y, Ce, and Zr contents (ppm) in the whole rocks. The second equation is more suitable for peralkaline to alkaline rocks with M > 2 and a wide range of SiO2. Both equations are applicable for temperatures from 750 °C to 1400 °C. These two equations are simple and robust thermometry methods and predict similar values in the range of TZr thermometry, which has previously been suggested for magma crystallization temperature.

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Zircon geochronology and O-Hf isotopes of Cappadocian ignimbrites: New insights into continental crustal architecture underneath the Central Anatolian Volcanic Province, Turkey

et al. 2021

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Hafnium, oxygen, neodymium, strontium, and lead isotopic constraints on magmatic evolution of the supereruptive southern Black Mountains volcanic center, Arizona, U.S.A.: A combined LASS zircon–whole-rock study

Cited by 11 publications

References 71 publications

Detrital zircon resolve longevity and evolution of silicic magmatism in extinct volcanic centers: A case study from the East Fjords of Iceland

Detrital zircon resolve longevity and evolution of silicic magmatism in extinct volcanic centers: A case study from the East Fjords of Iceland

Estimating Magma Crystallization Temperatures Using High Field Strength Elements in Igneous Rocks

Zircon geochronology and O-Hf isotopes of Cappadocian ignimbrites: New insights into continental crustal architecture underneath the Central Anatolian Volcanic Province, Turkey

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