Article
Nuclear Science & Technology
Monika Devi, Naveen Chauhan, Haresh Rajapara, Sachin Joshi, A. K. Singhvi
Summary: This study explores the athermal fading rates in K-feldspar grains from sediments of different ages and provenances. The researchers tested various combinations of stimulation and emission spectral regions to find the optimal combination that minimizes athermal fading. They found that using sequential double stimulation resulted in lower fading rates, with the post violet-IR stimulation showing the lowest fading rate.
RADIATION MEASUREMENTS
(2022)
Article
Geography, Physical
Ting Cheng, Dongju Zhang, Hui Zhao, Shengli Yang, Bo Li
Summary: The high-temperature pIRIR signals of feldspar are widely used for dating, but their slow bleachability and high residual dose limit their application. This study found significant variation in the bleachability of pIRIR signals among different K-feldspar grains from the same sample, which may introduce additional scatter in D-e values. The authors propose a method for quickly testing the bleachability of individual grains and suggest selecting easy-to-bleach grains for efficient dating of young samples.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Geography, Physical
Yixuan Wang, Guoqiang Li, Xiaoyan Wang, Zhongfeng Yan, Caixin Qin, Jilei Yang, He Yang, Yanqing Deng, Long Pan, Chunzhu Chen, Wenwei Zhao, Guangliang Hou
Summary: The increased frequency of flooding on the Tibetan Plateau as a result of global warming has affected human settlements in the river valleys. This study investigated the relationship between human settlement, climate change, and flooding using various dating methods. The results show that flooding events increased during certain periods, coinciding with the occurrence of cultural layers and a moist and warm climate. The findings highlight the significance of flooding in shaping human settlement on the northeastern Tibetan Plateau.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Nuclear Science & Technology
S. Riedesel, A. M. T. Bell, G. A. T. Duller, A. A. Finch, M. Jain, G. E. King, N. J. Pearce, H. M. Roberts
Summary: This paper investigates the relationships between chemistry, structural state and the scale of exsolution with thermoluminescence (TL) emission spectra and infrared stimulated luminescence (IRSL) fading rates in feldspars. The study shows that fading rates are influenced by the Al-Si order in feldspars, with ordered end-member Na and K-feldspars exhibiting lower fading rates. Perthites, as exsolved members, demonstrate greater fading than disordered end-members.
RADIATION MEASUREMENTS
(2021)
Article
Geosciences, Multidisciplinary
Yan Li, Sumiko Tsukamoto, Michael Klinge, Daniela Sauer, Manfred Frechen
Summary: K-feldspar luminescence dating is widely used to determine the timing of Quaternary sedimentation in various environments. However, the process is time-consuming and can lead to dating uncertainties due to anomalous fading and partial bleaching. A study in Mongolia used sand-size K-feldspar grains to establish a luminescence chronology using the post-infrared (IR) infrared stimulated luminescence protocol. Standardized dose-response curves were constructed to improve measurement efficiency. The study found consistent ages using the sDRCs and individual DRC, indicating their applicability for luminescence dating.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Baojun Zhou, Junlai Liu, Xiaoyu Chen, Chunru Hou
Summary: This study investigates the mechanisms of grain-size reduction of K-feldspar during shearing in the middle crust using granitic mylonites from the Shuiyu shear zone. The results show that grain-size reduction is achieved through fluid-assisted subgrain rotation recrystallization, with hydrolytic weakening enhancing the dislocation motions to form subgrains.
Article
Nuclear Science & Technology
Junjie Zhang, Sumiko Tsukamoto
Summary: The post-infrared infrared stimulated luminescence signal (pIRIR) in K-feldspar has less athermal fading and is widely used for dating Quaternary deposits. A multiple aliquot regenerative dose (MAR) protocol using low-temperature thermoluminescence (TL) signal is presented in this study. The D0 value in the MAR protocol is increased to 850-1300 Gy, which has the potential to date samples beyond 600 ka.
RADIATION MEASUREMENTS
(2022)
Article
Geochemistry & Geophysics
Yongmei Zhang, Xuexiang Gu, Brian Rusk, Wei Mao, Jialin Wang, Shaohua Zheng
Summary: The concentration difference of trace elements in quartz and K-feldspar from different types of felsic igneous rocks is closely related to the rock-forming process and P-T condition. The Ti concentration in quartz decreases while the Al, Li, and Ge concentrations increase from plutonic to pegmatitic rocks, indicating a higher degree of magmatic fractionation and lower crystallization temperature. In K-feldspar, certain elements show decreasing trends while others show increasing trends among different types of granitic rocks. The activation of Ti-impurity in both minerals leads to increased CL intensity, and there is a positive correlation between Ti concentrations in quartz and K-feldspar.
JOURNAL OF PETROLOGY
(2022)
Article
Engineering, Chemical
Yusheng Wu, Laishi Li, Xiaofu Liu, Yuzheng Wang, Mingchun Li
Summary: A novel hydrothermal alkaline process combined with ammonium hydrogen sulfate solution leaching process was developed to improve the comprehensive utilization value of K-feldspar. The hydrothermal temperature has a significant influence on the decomposition of K-feldspar, while the concentration of potassium hydroxide has little effect.
MINERALS ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Lai-shi LI, Jun-jie Tang, Yu-sheng Wu, Meng Yu
Summary: The effects of sucrose concentration on the decomposition rates of K-feldspar were investigated, and the influence mechanism of sucrose on the phase change of K-feldspar during hydrothermal decomposition was elucidated.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Geosciences, Multidisciplinary
Yuxin Fan, Zhenjun Li, Qingsong Cai, Guangliang Yang, Qingsong Zhang, Hui Zhao, Fahu Chen, Mehran Maghsoudi
Summary: Recent studies have shown high lake levels in western China during the late Quaternary, with intervals of higher lake levels during Marine Isotope Stage (MIS) 5e and MIS 3a-Last Glacial Maximum (LGM) in the Jilantai sub-depression. These high lake levels were likely a geomorphic response to dry climatic conditions rather than representative of humid climates in arid regions.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
David London
Summary: The K/Cs ratios of K-feldspars from granitic pegmatites are compared to models derived from the Rayleigh equation. The trends in elemental ratios conform to Rayleigh fractionation for the crystallization of feldspars and micas from a silicate melt. The addition of an aqueous solution to the Rayleigh model predicts high and increasing K/Cs ratios of K-feldspars that are not observed in natural rock suites.
AMERICAN MINERALOGIST
(2022)
Article
Geochemistry & Geophysics
Jiangyan Yuan, Hongwen Ma, Zheng Luo, Xi Ma, Qian Guo
Summary: The study focused on processing K-bearing rocks to make potassium accessible to agriculture, resulting in the successful production of two types of KAlSiO4. By comparing the crystal structures of the two types of KAlSiO4, the research highlighted the importance of effective utilization of aluminosilicate minerals in nature. Additionally, the study adopted a kinetics model to describe the dissolution behavior, revealing the higher dissolution reaction rate of K-feldspar mainly relies on the alkaline solution.
Article
Agriculture, Multidisciplinary
Xing Gao, Yong-xiang Li, Ming-tao Yang, Chun-hui Li, Yan-chun Song, Tian-yu Wang, Yu Li, Yun-su Shi
Summary: This study analyzed 50 maize hybrids released in China from 1964 to 2014 and found that the duration and rate of grain filling greatly influenced the 100-kernel weight. The growing degree days for the grain-filling period increased over the years, but the days from sowing to physiological maturity did not show significant changes. Grain-filling rate did not vary with the release years. Exotic hybrids had longer grain-filling duration and more stable characteristics compared to local hybrids. The results suggest that longer grain-filling duration, shorter days to silking, higher grain-filling rate, and stable characteristics can contribute to yield improvement of maize hybrids in the future.
JOURNAL OF INTEGRATIVE AGRICULTURE
(2023)
Article
Geochemistry & Geophysics
Jing Chen, Zhenmin Jin, Wenlong Liu, Yongfeng Wang, Junfeng Zhang
Summary: This study conducted experiments to investigate the rheology of relatively dry K-feldspar aggregates under high temperature and pressure conditions. The results showed that dry K-feldspar has stronger creep strength compared to wet quartz and plagioclase, potentially explaining the formation of feldspar porphyroclasts in crustal rocks. However, under lower crustal and deep continental subduction conditions, K-feldspar may also exhibit ductile deformation at high temperatures.
Article
Multidisciplinary Sciences
Kseniya A. Kolobova, Richard G. Roberts, Victor P. Chabai, Zenobia Jacobs, Maciej T. Krajcarz, Alena V. Shalagina, Andrey I. Krivoshapkin, Bo Li, Thorsten Uthmeier, Sergey V. Markin, Mike W. Morley, Kieran O'Gorman, Natalia A. Rudaya, Sahra Talamo, Bence Viola, Anatoly P. Derevianko
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Geosciences, Multidisciplinary
Mariana Sontag-gonzalez, Marine Frouin, Bo Li, Jean-Luc Schwenninger
Summary: The study found that violet stimulated luminescence (VSL) was successful in determining equivalent dose for relatively young samples but significantly underestimated in older samples with higher doses. Further development of measurement protocols is needed to date high-dose natural samples.
Article
Geography, Physical
Ariel Malinsky-Buller, Phil Glauberman, Keith Wilkinson, Bo Li, Ellery Frahm, Boris Gasparyan, Rhys Timms, Daniel S. Adler, Jennifer Sherriff
Summary: The findings from excavations at the Middle Palaeolithic site of Alapars-1 in central Armenia reveal changes in human occupation patterns from ephemeral to more persistent during the last interglacial and glacial periods. Sedimentological and chronological analyses show three phases of sedimentation and soil development, along with differential artifact discard patterns and source exploitation. This suggests variability in technological organization during the Middle Palaeolithic.
QUATERNARY RESEARCH
(2021)
Article
Geography, Physical
Kieran O'Gorman, Frank Brink, Dominique Tanner, Bo Li, Zenobia Jacobs
Summary: Potassium-rich feldspars are commonly used for optical dating, but their internal dose rates vary due to different K concentrations. Quantitative evaluation of minerals using energy dispersive spectroscopy (QEM-EDS) is an efficient and automated technique that can accurately determine K concentrations in feldspar grains, improving the accuracy of optical dating methods.
QUATERNARY GEOCHRONOLOGY
(2021)
Article
Multidisciplinary Sciences
Benjamin Vernot, Elena Zavala, Asier Gomez-Olivencia, Zenobia Jacobs, Viviane Slon, Fabrizio Mafessoni, Frederic Romagne, Alice Pearson, Martin Petr, Nohemi Sala, Adrian Pablos, Arantza Aranburu, Jose Maria Bermudez de Castro, Eudald Carbonell, Bo Li, Maciej T. Krajcarz, Andrey Krivoshapkin, Kseniya A. Kolobova, Maxim B. Kozlikin, Michael Shunkov, Anatoly P. Derevianko, Bence Viola, Steffi Grote, Elena Essel, David Lopez Herraez, Sarah Nagel, Birgit Nickel, Julia Richter, Anna Schmidt, Benjamin Peter, Janet Kelso, Richard G. Roberts, Juan-Luis Arsuaga, Matthias Meyer
Summary: This study demonstrates the importance of using nuclear DNA extracted from sediments for studying the population history of ancient hominins. Population replacement in northern Spain and radiation events in Neanderthal history during the Late Pleistocene were identified through analysis of cave deposits in western Europe and southern Siberia.
Article
Multidisciplinary Sciences
Elena Zavala, Zenobia Jacobs, Benjamin Vernot, Michael Shunkov, Maxim B. Kozlikin, Anatoly P. Derevianko, Elena Essel, Cesare de Fillipo, Sarah Nagel, Julia Richter, Frederic Romagne, Anna Schmidt, Bo Li, Kieran O'Gorman, Viviane Slon, Janet Kelso, Svante Paabo, Richard G. Roberts, Matthias Meyer
Summary: Denisova Cave in southern Siberia is the type locality of the Denisovans, an archaic hominin group who were related to Neanderthals. The cave yielded hominin remains from different groups, indicating it was a contact zone between Neanderthals and Denisovans. The study reveals that Denisovans and Neanderthals repeatedly occupied the site, with modern human DNA appearing in the sediments at least 45,000 years ago.
Article
Geography, Physical
Mariana Sontag-Gonzalez, Bo Li, Kieran O'Gorman, Thomas Sutikna, Jatmiko, Zenobia Jacobs, Richard G. Roberts
Summary: The study presents an improved dating procedure for volcanic sediments at Liang Bua, allowing for more accurate estimation of their ages. By investigating the luminescence behavior of composite mineral grains, a standardized growth curve and a new measurement method were developed to effectively estimate the equivalent dose.
QUATERNARY GEOCHRONOLOGY
(2021)
Article
Geography, Physical
Kieran O'Gorman, Dominique Tanner, Mariana Sontag-Gonzalez, Bo Li, Frank Brink, Brian G. Jones, Anthony Dosseto, Jatmiko, Richard G. Roberts, Zenobia Jacobs
Summary: This study investigated the potassium-rich feldspar grains in sediment samples from Liang Bua in Indonesia and found that the assumption of potassium and rubidium concentrations for dose rate and age calculation may be incorrect. It is important to consider the internal dose rates of feldspar grains with complex mineralogies to ensure accurate age calculations, especially in volcanic regions like Island Southeast Asia.
QUATERNARY GEOCHRONOLOGY
(2021)
Article
Geography, Physical
Ting Cheng, Dongju Zhang, Geoff M. Smith, Olaf Joeris, Jian Wang, Shengli Yang, Huan Xia, Xuke Shen, Qiong Li, Xiaoshan Chen, Dongpeng Lin, Yuanyuan Han, Yishou Liu, Mingrui Qiang, Bo Li, Fahu Chen
Summary: The paleolithic archaeological record of the Tibetan Plateau is crucial for understanding human ecological and genetic adaptation to high altitudes. Recent research has shown Denisovans and modern humans occupied the region at different times, but aside from a few reliable sites, the spatial and temporal history of paleolithic human occupation on the plateau remains poorly understood.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Bo Li, Zenobia Jacobs, Richard G. Roberts
Summary: In this study, a Bayesian method is introduced to detect and account for outliers in single-grain optical dating, allowing for more accurate estimation of equivalent dose values for the target population. The Bayesian outlier model (BOM) is found to be effective in identifying outliers associated with undesirable luminescence properties or contaminant grains, thus improving the accuracy of final De and age determination.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Optics
George Kitis, Jun Peng, Bo Li, Vasilis Pagonis
Summary: This study introduces a new analytical expression to describe the dose response curves of sedimentary samples, which is equally successful as two existing equations. This research is important for the precise evaluation of equivalent beta dose in stimulated luminescence dating.
JOURNAL OF LUMINESCENCE
(2022)
Article
Geography, Physical
Xiao Fu, Anna A. Romanyukha, Bo Li, Nathan R. Jankowski, Terry J. Lachlan, Zenobia Jacobs, Stuart P. George, Anatoly B. Rosenfeld, Richard G. Roberts
Summary: Single-grain optical dating is widely used for estimating the ages of Quaternary sediments. Understanding the sources that affect the dispersion of equivalent dose estimates from individual grain measurements is crucial for accurate age determination. This study demonstrates the use of Timepix, a pixelated detector, to measure beta emissions and determine beta microdosimetry in natural sediment samples. The results show that the estimates of beta dose rate are heterogeneous, leading to overdispersion in the single-grain dose distributions.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Geography, Physical
Xue Rui, Bo Li, Baoyin Yuan, Jiafu Zhang
Summary: In the Yuxian sub-basin of the Nihewan Basin in North China, the discovery of over 27 new archaeological sites lacking age control has prompted investigation into the fluvial terrace sequence of the Huliu River. Dating using pIRIR on potassium feldspar revealed formation ages for three Huliu River terraces, providing insights into human occupation in the region.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Geography, Physical
Ting Cheng, Dongju Zhang, Hui Zhao, Shengli Yang, Bo Li
Summary: The high-temperature pIRIR signals of feldspar are widely used for dating, but their slow bleachability and high residual dose limit their application. This study found significant variation in the bleachability of pIRIR signals among different K-feldspar grains from the same sample, which may introduce additional scatter in D-e values. The authors propose a method for quickly testing the bleachability of individual grains and suggest selecting easy-to-bleach grains for efficient dating of young samples.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Humanities, Multidisciplinary
Lyn Wadley, Guilhem Mauran, Christine Sievers, Hennie van Deventer, Wim Biemond, Klaas Seanego, Bo Li, Zenobia Jacobs
Summary: Red Balloon Rock Shelter, located on the Waterberg Plateau in Limpopo Province, has revealed a large number of Iron Age ceramics and Middle Stone Age lithics. The shelter may have been used for rain-making purposes since the first Iron Age settlement in the area. Discoveries of ostrich eggshell beads, worked bone, and seeds suggest a vegetation similar to the current one, along with the possible use of red balloon seeds as beads.
SOUTHERN AFRICAN HUMANITIES
(2021)
Article
Geography, Physical
Monika Devi, Naveen Chauhan, Ashok K. Singhvi
Summary: Devi et al. (2022) suggested that post-violet infrared stimulated luminescence (pVIRSL) of K-feldspars has a near zero athermal fading rate. This study investigates the mechanism and suitability of the pVIRSL signal for dating applications. The results show that pVIRSL is a recuperated signal resulting from the eviction and recapture of charges in deep traps by violet stimulation and subsequent infrared stimulation. The pVIR-SAR protocol worked well for dating seven K-feldspar samples from various depositional environments.
QUATERNARY GEOCHRONOLOGY
(2024)
Article
Geography, Physical
Chloe Baldreki, Andrew Burnham, Martina Conti, Lucy Wheeler, Michael J. Simms, Lawrence Barham, Tom S. White, Kirsty Penkman
Summary: Aragonitic calcium carbonate mollusc shells with complex shell microstructures can be used for amino acid geochronologies in Africa. Different microstructural shell layers may have different protein compositions, requiring sampling strategies. The 3AL shell portion showed closer adherence to closed-system behavior and demonstrated the potential of fossil achatinids for building relative amino acid geochronologies across Africa.
QUATERNARY GEOCHRONOLOGY
(2024)
Article
Geography, Physical
Patrick Chiroiu, Alexandru L. Onaca, Adrien Favillier, Mircea Voiculescu, Christophe Corona, Petru Urdea, Markus Stoffel
Summary: Snow avalanches present a constant threat to mountainous regions worldwide, and understanding past avalanche events is crucial for managing and mitigating avalanche hazards and risks. In this study, dendrogeomorphic techniques were used to analyze 17 avalanche paths in a small region of the Fagaras Mountains. The analysis reconstructed 174 snow avalanche years across all paths and revealed widespread avalanche occurrence in the study area. The study emphasizes the importance of investigating multiple avalanche paths in a small, homogeneous area to gain a better understanding of snow avalanche activity at both path-scale and mountain range-scale.
QUATERNARY GEOCHRONOLOGY
(2024)
