U–Th whole rock data and high spatial resolution U–Th disequilibrium and U–Pb zircon ages of Mt. Erciyes and Mt. Hasan Quaternary stratovolcanic complexes (Central Anatolia)

Friedrichs, Bjarne; Schmitt, Axel K.; McGee, Lucy; Turner, Simon

doi:10.1016/j.dib.2020.105113

Cited by 13 publications

(3 citation statements)

References 9 publications

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“…(2006, 2011) and Schmitt (2011) with the background correction described in Friedrichs et al . (2020). A ∼ 40 nA O ‐ primary beam was focussed through a 40 μm Kohler aperture onto the sample.…”

Section: Methodsmentioning

confidence: 99%

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SS14‐28: An Age Reference Material for Zircon U‐Th Disequilibrium Dating

Marsden

Danišík

Schmitt

et al. 2021

Geostandard Geoanalytic Res

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U‐Th disequilibrium dating uses the ratio of the intermediate 230Th daughter isotope to the 238U parent isotope to date zircon crystallisation for volcanic and plutonic rocks in Pleistocene–Holocene deposits. It is frequently used to constrain the duration and rate of magma recharge in volcanic systems. While ≲ 350 ka zircon is not in secular equilibrium in the 230Th system, the current U‐Th disequilibrium methodology uses reference materials that are > 350 ka. No reference material ≲ 350 ka has been available to validate the accuracy of the approach and ensure methods are repeatable across laboratories. This study presents zircon SS14‐28 from Jeju Island (South Korea) as a suitable reference material for U‐Th disequilibrium dating. Zircon SS14‐28 was analysed using two analytical approaches (SIMS and LA‐ICP‐MS) and four instruments: CAMECA IMS 1280, ASI SHRIMP II, sector field high‐resolution LA‐ICP‐MS and multi‐collector LA‐ICP‐MS, in four laboratories. These methods each individually result in isochrons gradients within uncertainty (2s) of each other (CAMECA: 0.532 ± 0.051 (MSWD = 0.64); SF‐HR‐LA‐ICP‐MS: 0.536 ± 0.054 (MSWD = 1.3); MC‐LA‐ICP‐MS: 0.533 ± 0.041 (MSWD = 0.67); SHRIMP II: 0.68 ± 0.22 (MSWD = 0.3)). The age proposed in this study is 82 ± 6 ka calculated from a combined isochron gradient of 0.529 ± 0.025 (MSWD = 0.87, n = 132).

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Section: Methodsmentioning

confidence: 99%

“…2019, Friedrichs et al . 2020, Popa et al . 2020), whereby the gradient of the isochron defines the age of crystallisation (Reid et al .…”

Section: U‐th Disequilibrium Theorymentioning

confidence: 99%

SS14‐28: An Age Reference Material for Zircon U‐Th Disequilibrium Dating

Marsden

Danišík

Schmitt

et al. 2021

Geostandard Geoanalytic Res

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“…Even though the model of Rybach is reliant on the point that there is a fixed proportion between the end products (daughter) used for the estimation of the Uranium and Thorium equivalents (Rybach 1976). However, these different daughter products have different movement properties whether as reducing or oxidizing conditions which implies that the end products possibly will be moved away from the rock over some period of time (Ivanovich and Harmon 1992;Angileri et al 2020) and this will result to disequilibrium which implies that there may perhaps be a greater or lesser Thorium or Uranium concentration than is specified by gamma-ray survey (Friedrichs et al 2020).…”

Section: Radioactive Disequilibrium Of Uraniummentioning

confidence: 99%

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

Alabi,

Sedara,

Ajah

et al. 2023

Preprint

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Many factors complicate the estimation of radiogenic heat production (RHP) which may lead to radionuclide concentrations which does not characterize the RHP being produced by rocks. One of this is the Uranium disequilibrium effect. We modified an existing model to minimize this effect. A revised data from gamma-ray spectrometry was used to compute the Beta and Alpha energies (Eβmax) of decay schemes, mass defect (EΔm)of radioelements, total absorbed energy (Eabs) per atom, numerical constants (Ai) and converted to the accepted RHP unit (µWm-3). The modified RHP model (A3) was evaluated and validated using error metrics and radiometric data from seven regions of Nigeria and India. The data was normalized to transform features to be on a similar scale to attain a normal distribution of the data. The modified model (A3) was compared with Birch’s (A1) and Rybach’s (A2) RHP models. All these processes were implemented in Python environment. The RHP constants is several percent higher (6.2% for U; 11.5% for Th) than the values of A1 and A2 RHP models except for Potassium which is higher (74.3%). The A3 RHP model gotten is: A(µWm-3) = ρ(0.103CU + 0.29CTh + 0.061CK). The contributing percentages of the radioelements were in the order of 40K > 238U > 232Th for the Southwest, Southeast and Northcentral regions of Nigeria while the order is 238U > 232Th > 40K for the Southsouth, Northeast and Northwest regions and in order 232Th > 238U > 40K for the Indian region. The A3 model returned a higher R2 value and lower SSE/RMSE/MAE values compared to A1 and A2 models. The R2 values ranged from 42–72% while RMSE ranged from 0.790–1.127. The A3 has the best performance in all metrics for all the regions. The coefficient of determination (R2) for the proportion of variance of the contribution of the radioelements placed K-40 as most dependent variable with a good correlation with the total RHP in the order of use of A1 < A2 < A3. In general A3 return the highest RHP values across all regions. The A3 RHP model gave a higher R2 value and lower RMSE, MAE, SSE values than A1 and A3 RHP models which is an indicator of best performance. The A3 RHP model performed well in all the regions in Nigeria and outside Nigeria. This shows that the A3 RHP model is not geological-formation dependent.

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Surface expressions of morphostructural features at Hasandağ stratovolcano on DEM datasets

et al. 2020

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Although the young pyroclastic cover tends to hide the structural features, derivatives of Digital Elevation Models (DEM) help reveal the morphological elements exposing the structure of the volcanoes. While the shaded relief maps improve the visuality of the DEM data, they are not the best derivatives to express the detailed morphological characteristics of the terrain. Advanced morphometric DEM derivatives, such as Red Relief Image Maps and Openness images, provide improved terrain legibility especially on volcanic landforms. Satellite-derived mid-resolution DEM and very-high-resolution aerial stereo-photogrammetric summit model of Hasandağ was used to investigate the structural features of the volcano. The mid-resolution topographic derivatives evidently mapped structural features which have had important role in the evolution of the volcano. Effect of fault systems on the development of the volcano, evident and probable topographic rims of collapse structures, avalanche and lava flow surface morphologies and characteristics revealed by the advanced derivatives of DEMs were evaluated. Summit of Greater Hasandağ volcano was modeled using Structure-from-Motion/Multiview stereophotogrammetry using acquired drone imagery; the model presents the summit geology in high-resolution and precision.

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U–Th whole rock data and high spatial resolution U–Th disequilibrium and U–Pb zircon ages of Mt. Erciyes and Mt. Hasan Quaternary stratovolcanic complexes (Central Anatolia)

Cited by 13 publications

References 9 publications

SS14‐28: An Age Reference Material for Zircon U‐Th Disequilibrium Dating

SS14‐28: An Age Reference Material for Zircon U‐Th Disequilibrium Dating

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

Surface expressions of morphostructural features at Hasandağ stratovolcano on DEM datasets

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