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

DOI: 10.1016/J.GEXPLO.2017.11.015 Corpus ID: 134068471; K-feldspar composition as an exploration tool for pegmatite-type rare metal deposits in Altay, NW China @article{Tang2018KfeldsparCA, title={K-feldspar composition as an exploration tool for pegmatite-type rare metal deposits in Altay, NW China}, author={Yong Tang and Hong …

Request PDF | On Jan 1, 2014, Guoqiang Li and others published Quartz and K-feldspar optical dating chronology of eolian sand and lacustrine sequence from the southern Ulan Buh Desert, NW China ...

Request PDF | On Feb 1, 2024, Hao Long and others published Single-grain K-feldspar luminescence dating of the late Quaternary rapid decline in the largest Lake over the Tibetan Plateau | Find ...

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 …

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 ...

Cheng et al. (2017a) reported K-feldspar megacrysts in rhyolites from the Permian Emeishan large igneous province, southwest China. These K-feldspar megacrysts usually have the long axis length <1 ...

In this study, we present a dataset that includes 1785 quartz optically stimulated luminescence ages and 1038 K-feldspar post-infrared infrared stimulated …

Here we develop a fully independent age model for the Jingbian section over the last ~250 ka using a combination of the quartz …

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 ...

An increase in 16 O in the framework of K-feldspar was also observed with increasing reaction time: K-feldspar formed within 1 day from a NaF solution had 18 O/ 16 O ratios around 2, compared to 1 ...

In an effort to constrain the Pb isotope evolution of the Yilgarn Craton in Western Australia, we measured the 206 Pb/ 204 Pb, 207 Pb/ 204 Pb, and 208 Pb/ 204 Pb isotope ratios of K-feldspar from a transect of dated granite samples through this craton. We analyzed 16 samples, ten of which have igneous crystallization ages determined via …

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 …

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 ...

K-feldspar grains in sizes of 38–63 μm disappear completely in 30 min after etching in a 10% HF solution, while 63–90 μm grain sizes disappear in 40 min. ... However, the controlling mechanisms of stalagmite δ 18 O records in China have been widely debated in the past few years (Johnson and Ingram, 2004, ...

HIGH RESOLUTION QUARTZ OSL AND K-FELDSPAR post-IR IRSL DATING OF LOESS IN THE CENTRAL SHANDONG MOUNTAINS (EASTERN CHINA) …

In this study, the ages of sediments from the shorelines at altitudes of 1070–1050 m at the west and south bank of the present Jilantai sub-depression are measured using both blue-light stimulated OSL signals of single-aliquot quartz and pIR IRSL signals of single-grain K-feldspar at elevated temperature, because OSL dating …

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 ...

K-feldspar grains have significant internal radioactivity because of the existence of 40 K within the crystal structure; thus, the internal dose rate cannot be ignored. Here, we assume a K content of 12.5% ± 0.5% and a Rb concentration of 400 ± 100 ppm to calculate the internal dose rate of K-feldspar ( Huntley and Baril, 1997, Huntley and ...

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 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).

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....

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 …

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 …

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 ...

HIGH RESOLUTION QUARTZ OSL AND K-FELDSPAR post-IR IRSL DATING OF LOESS IN THE CENTRAL SHANDONG MOUNTAINS (EASTERN CHINA) QIUYUE ZHAO: 1, MIN DING: 1, SHUZHEN PENG: 1, LUO WANG: 2, WEI ZHANG: 1 ... humid region of eastern China. It is also sensitive records of East Asian monsoon changes for situating in a key …

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 …

K-feldspar composition as an exploration tool for pegmatite-type rare metal deposits in Altay, NW China | Semantic Scholar. DOI: 10.1016/J.GEXPLO.2017.11.015. …

The propensity of K-feldspar to incorporate Pb into its crystal structure while excluding U and Th allows it to record Pb isotopic compositions that are effectively time invariant (Patterson and Tatsumoto, 1964).Pb isotopic data measured from K-feldspar thus complement equivalent data garnered from ore deposits and age-corrected whole rock …

Request PDF | K-feldspar composition as an exploration tool for pegmatite-type rare metal deposits in Altay, NW China | Trace elements of potassium feldspar (Kfs) from pegmatite veins in the ...