scholarly journals Single Aliquot Regeneration (SAR) Optically Stimulated Luminescence Dating Protocols Using Different Grain-Sizes of Quartz: Revisiting the Chronology of Mircea Vodă Loess-Paleosol Master Section (Romania)

2020 ◽  
Vol 3 (1) ◽  
pp. 19 ◽  
Author(s):  
Ștefana-M. Groza-Săcaciu ◽  
Cristian Panaiotu ◽  
Alida Timar-Gabor
Keyword(s):  
Dose Range ◽  
Test Dose ◽  
Optically Stimulated Luminescence ◽  
Luminescence Dating ◽  
High Dose ◽  
Response Curves ◽  
Fine Grain ◽  
Current State ◽  
Optically Stimulated Luminescence Dating ◽  
Fine Quartz

The loess-paleosol archive from Mircea Vodă (Romania) represents one of the most studied sections in Europe. We are applying here the current state of the art luminescence dating protocols for revisiting the chronology of this section. Analysis were performed on fine (4–11 µm) and coarse (63–90 µm) quartz extracts using the single aliquot regenerative (SAR) optically stimulated luminescence (OSL) dating protocol. Laboratory generated SAR dose response curves in the high dose range (5 kGy for fine quartz and 2 kGy for coarse quartz) were investigated by employing a test dose of either 17 or 170 Gy. The results confirm the previously reported different saturation characteristics of the two quartz fractions, with no evident dependency of the equivalent dose (De) on the size of the test dose. The OSL SAR ages are discussed and compared to the previously obtained results on quartz and feldspars. The previous reports regarding the chronological discrepancy between the two quartz fractions are confirmed. However, while previous investigations on other sites concluded that this discrepancy appears only above equivalent doses of about 100 Gy, here fine grain quartz ages underestimate coarse quartz ages starting with equivalent doses as low as around 50 Gy.

Optically stimulated luminescence dating using quartz

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Andrew Murray ◽  
Lee J. Arnold ◽  
Jan-Pieter Buylaert ◽  
Guillaume Guérin ◽  
Jintang Qin ◽  
...  
Keyword(s):  
Optically Stimulated Luminescence ◽  
Luminescence Dating ◽  
Optically Stimulated Luminescence Dating

scholarly journals Paleoseismological Findings at a New Trench Indicate the 1714 M8.1 Earthquake Ruptured the Main Frontal Thrust Over all the Bhutan Himalaya

2021 ◽  
Vol 9 ◽  
Author(s):  
Yuqiu Zhao ◽  
Djordje Grujic ◽  
Santanu Baruah ◽  
Dawchu Drukpa ◽  
Joanne Elkadi ◽  
...  
Keyword(s):  
River Sediments ◽  
Stress Transfer ◽  
Foreland Basin ◽  
Optically Stimulated Luminescence ◽  
Luminescence Dating ◽  
Surface Rupture ◽  
Himalayan Orogen ◽  
Seismic Slip ◽  
Optically Stimulated Luminescence Dating ◽  
The Himalaya

The 1714 Bhutan earthquake was one of the largest in the Himalaya in the last millennium. We show that the surface rupture caused by this earthquake extended further to the east than previously known, it was at least 175 km long, with slip exceeding 11 m at our study site. The age of the surface rupture was constrained by a combination of radiocarbon and traditional optically stimulated luminescence dating of affected river sediments. Computations using empirical scaling relationships, fitting historical observations and paleoseismic data, yielded a plausible magnitude of Mw 8.1 ± 0.4 and placed the hypocentre of the 1714 Bhutan earthquake on the flat segment of the Main Himalayan Thrust (MHT), the basal décollement of the Himalayan orogen. Calculations of Coulomb stress transfer indicate that great earthquakes along the leading part of the MHT would cause surface rupture. In contrast, distal earthquakes may not immediately trigger surface rupture, although they would increase the stresses in the leading part of the MHT, facilitating future surface-rupturing earthquakes. Frontal earthquakes would also transfer stress into the modern foreland basin facilitating southward propagation of the MHT as a blind basal décollement. In conclusion, studies of surface-rupturing events alone likely underestimate the seismic slip along the Himalayan megathrust.

scholarly journals Use of the Optically Stimulated Luminescence Dating and X-Ray Fluorescence Spectrometry Methods as Tools in Paleoseismology

2019 ◽  
Vol 22 ◽  
pp. 107
Author(s):  
L. M. Tsodoulos ◽  
K. Stamoulis ◽  
C. A. Papachristodoulou ◽  
K. G. Ioannides ◽  
S. Pavlides
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Optically Stimulated Luminescence ◽  
Osl Dating ◽  
Luminescence Dating ◽  
Alluvial Deposits ◽  
X Ray ◽  
Fault Block ◽  
Optically Stimulated Luminescence Dating ◽  
Dating Method

We have investigated the application of luminescence dating to sediment and pottery samples from a paleoseismological trench excavated in the Gyrtoni Fault, Tyrnavos Basin, Central Greece. The samples were dated following the optically stimulated luminescence (OSL) dating method, using the Riso TL/OSL DA-20 reader. The OSL ages were obtained from chemically purified quartz and a single-aliquot regenerative-dose (SAR) protocol was followed for the equivalent dose (De) determination. Additionally, samples were collected and analyzed with the method of X-ray Fluorescence (XRF) spectrometry, in order to assess their elemental composition. Radioisotope sources (109Cd and 241Am) were used for sample excitation, while X-ray spectra were acquired using a Si(Li) detector coupled with standard electronics. The XRF data were submitted to principal component analysis (PCA). This statistical handling aimed to distinguish from which part of the upthrown fault block scarp-derived colluvium and alluvial deposits, parts of the downthrown block were derived and thus estimate the displacement. The results indicated that both the OSL dating method and the XRF analysis combined with PCA can serve as useful tools for paleoseismological investigations.

Sign in / Sign up

Export Citation Format

Share Document