(PDF) High resolution quartz OSL and K-feldspar …
Geoscience. Loess. Article PDF Available. High resolution quartz OSL and K-feldspar post-IR IRSL dating of loess in the central Shandong Mountains (eastern China) May 2020. Geochronometria....
Late Quaternary lake evolution in the Gaxun Nur basin, …
Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China. ... Quartz optically stimulated luminescence and K-feldspar post-infrared infrared stimulated luminescence methods were used to date these shoreline features. The reliability of ...
Review of the Post-IR IRSL Dating Protocols of K-Feldspar
The post-IR IRSL (pIRIR) signal of K-feldspar stimulated at a higher temperature after a prior low-temperature IR stimulation has significantly lower fading rate. Different dating protocols have been proposed with the pIRIR signals and successful dating applications have been made. In this study, we review the development of various pIRIR ...
Cenozoic reorganization of fluvial systems in eastern China
Eocene to lower Oligocene sandstones in Taiwan are characterized by radiogenic K-feldspar grains (206Pb/204Pb>18.4), indicating that the eastern Cathaysia Block served as the dominant sediment ...
Quartz and K-feldspar luminescence dating of
Quartz and K-feldspar luminescence dating of sedimentation in the North Bohai coastal area (NE China) since the late pleistocene - ScienceDirect. Journal of …
Ice-volume-forced erosion of the Chinese Loess …
Here we develop a fully independent age model for the Jingbian section over the last ~250 ka using a combination of the quartz …
A comprehensive dataset of luminescence chronologies and …
In this study, we present a dataset that includes 1785 quartz optically stimulated luminescence ages and 1038 K-feldspar post-infrared infrared stimulated …
Quartz and K-feldspar optical dating chronology of eolian …
A 120 m drill core from the Ulan Buh Desert, China has a desert-lake-desert sequence.. Quartz OSL and K-feldspar IRSL dating methods were applied to core samples. • A sand desert landscape formed in the region by at least ~ 232 ka and after ~ 87 ka. A deep paleolake was present from sometime before ~ 155 ka until ~ 90 ka. Both …
Quartz and K-feldspar luminescence dating of a Marine …
Shoreline features at Juyanze, Gobi Desert, China are ~ 33 m above modern levels. K-feldspar pIRIR dating and quartz OSL dating were applied to shoreline features. • Three lacustrine sequences, separated by unconformities, span ~ 125–76 ka. A 33 m deep MIS 5 lake filled Juyanze and possibly the whole Ejina Basin.. The lake …
Geology and Geochemistry of K‐feldspar Veins in …
Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037 China. Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing, 210024 China. Search for more papers by this author. ... K-feldspar veins are genetically correlated with lamprophyres, whereas …
Late crystallization of K-feldspar and the paradox of …
K-feldspar crystals >5 cm in greatest dimension are common in calc-alkaline granites and granodiorites worldwide. Such megacrysts are generally interpreted as having grown to large sizes early in a magma's crystallization history while they were largely molten, owing to field relations such as megacryst alignment and megacryst-rich clusters …
Late Quaternary lake evolution in the Gaxun Nur basin, …
The recent development of post-IR IRSL (pIRIR) methods applied to K-rich feldspar isolates a slower or completely non-faded IRSL signal capable of dating sediments up to 250-300 ka owing to the ...
Frontiers | K-feldspar pIRIR150 dating of the Late …
4 Marine and Polar Research Center, China University of Geosciences, Beijing, China; K-feldspar luminescence dating has been widely applied to constrain the timing of Quaternary sedimentation in different environments. However, the measurements are time-consuming. Meanwhile, anomalous fading and partial bleaching are the two …
In Situ Trace Elements in Quartz and K-Feldspar from …
Pegmatite Altaidrare-elementdeposit, Xinjiang,China KH45(only K-feldspar) 220 Kfs(5–15mm), Qz(3–8mm), Ab(0.2–3mm), Mu Or 93 7 450–530 12,13 ...
Single-grain K-feldspar luminescence dating of the late …
Single-grain K-feldspar luminescence dating of the late Quaternary rapid decline in the largest Lake over the Tibetan Plateau. Author links open overlay panel Hao Long a c, ... stands as the largest closed-basin lake in China. It has a surface elevation of 3198 m above sea level (a.s.l.), and covers an area of approximately 4300 km 2 (Fig. 1 a).
Zircon U–Pb, Molybdenite Re–Os and K-feldspar …
Zircon U–Pb, Molybdenite Re–Os and K-feldspar 40Ar/39Ar ... Tibet, China Xiangping Zhu, Guangming Li, Huaan Chen, Dongfang Ma and Hanxiao Huang Chengdu Institute of Geology and Mineral Resources, Chengdu, China Abstract The Bolong porphyry Cu–Au deposit is a newly discovered deposit in the central Tibetan Plateau, and is
Fluid-enhanced grain-size reduction of K-feldspar from a …
For a comprehensive understanding of the mechanisms of grain-size reduction of K-feldspar in the middle crust, granitic mylonites from the Shuiyu shear …
Review on K-Feldspar Mineral Processing for Extracting …
Potassium feldspar (K-feldspar), as a type of insoluble potassium resource, is abundant in China, with reserves of over 10 billion tons . K-feldspar is …
Testing the upper limit of luminescence dating based on …
In this study, the MAR and SAR SGCs were established using K-feldspar extracted from different locations in the Nihewan Basin, northern China. We show that different shapes in the MAR and SAR SGCs at high temperatures can be attributed to the different amounts of residual signal in the MAR and SAR SGCs.
Quartz and K-feldspar luminescence dating of a Marine
Request PDF | Quartz and K-feldspar luminescence dating of a Marine Isotope Stage 5 megalake in the Juyanze Basin, central Gobi Desert, China | The Juyanze Basin, in the central Gobi Desert of ...
Microscopic analyses of weathered granite in ion-adsorption …
Results of X-ray diffraction (XRD) measurements indicated that weathered granite, collected from an ion-adsorption ore in Dingnan County, Jiangxi Province, China, is mainly composed of quartz, K ...
Origin of K-feldspar megacrysts in rhyolites from the …
Silicic rocks occur in the uppermost units of the longest volcanic succession (~ 5000 m thick) in the Binchuan area of the Permian Emeishan flood basalt province of SW China.They are predominantly rhyolites and to a lesser extent trachytes, both containing potassium feldspar megacrysts as the dominant phenocryst phase up to approximately …
Fluid-enhanced grain-size reduction of K-feldspar from a …
The MCC, tectonically located at the northern part of the eastern North China Craton (Zhu et al., 2015), comprises three structural units (Fig. 1a): (1) an upper plate of undeformed or weakly deformed Archean high-grade metamorphic basement, ... Fig. 12 show the chemical compositions of feldspar grains and calculated temperatures. K …
Systematic review of feldspar beneficiation and its comprehensive
Take for example a typical feldspar deposit in Altay, NW China, where feldspar, including sodic plagioclase and K-feldspar, is the main mineral in pegmatites and coexists with quartz, muscovite, garnet, and tourmaline (Tang et al., 2013, Zhou et al., 2013). Download : Download high-res image (137KB) Download : Download full-size …
(PDF) High resolution quartz OSL and K-feldspar …
The measured K-feldspar pIRIR 290 D e showed no dependency on the first IR stimulation temperature between 50°C and 260°C. The K-feldspar pIRIR 290 ages are consistent with the …
Zircon U–Pb, Molybdenite Re–Os and K‐feldspar 40Ar/39Ar …
Zircon U–Pb, Molybdenite Re–Os and K-feldspar 40 Ar/ 39 Ar Dating of the Bolong Porphyry Cu–Au Deposit, Tibet, China. Xiangping Zhu, Corresponding Author. Xiangping Zhu. Chengdu Institute of Geology and Mineral Resources, Chengdu, China ... The K-feldspar sample (ZK18707-485) used for 40 Ar/ 39 Ar dating was picked from an …
Zircon U–Pb and K-feldspar megacryst Rb–Sr isotopic ages …
K-feldspar restricted to the groundmass is characteristic for the first intrusive pulse, whereas K-feldspar megacrysts are restricted to the second magma pulse. Download : Download full-size image; Fig. 9. ... The strike of the Triassic Mian-Lue suture zone between the Yangtze block and the North China block (e.g., Chavagnac et al., ...
K-feldspar composition as an exploration tool for pegmatite …
The trace elements in K-feldspar are very useful geochemical indicators to assess not only the differentiation degree but also the potential for rare-metal mineralization in pegmatite. The most key trace elements in K-feldspar are Li, Rb, Cs, Sr, Ba, and P (as P 2 O 5). Gordiyenko (1971) proposed that feldspars with high concentration of Li, Rb ...
Testing the upper limit of luminescence dating based on standardised
In this study, the MAR and SAR SGCs were established using K-feldspar extracted from different locations in the Nihewan Basin, northern China. We show that different shapes in the MAR and SAR SGCs at high temperatures can be attributed to the different amounts of residual signal in the MAR and SAR SGCs.
Single-grain K-feldspar pIRIR dating of the Shalongka …
The post-IR IRSL protocol with single K-feldspar grains was applied to three samples taken from a fluvial sedimentary sequence at the archaeological site of the Dali Man, Shaanxi Province, China ...