Chronometry and formation pathways of gypsum using Electron Spin Resonance and Fourier Transform Infrared Spectroscopy

Nagar, Y.C.; Sastry, M. D.; Bhushan, Brij; Kumar, Amit; Mishra, K.P.; Shastri, Aparna; Deo, M. N.; Kocurek, Gary; Magee, John; Wadhawan, S. K.; Juyal, Navin; Pandian, M. S.; Shukla, A. D.; Singhvi, A. K.

doi:10.1016/j.quageo.2010.05.001

Cited by 24 publications

(9 citation statements)

References 26 publications

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“…Using ESR, Mathew et al (2004) established reactivation of KHF at ~70 ka based on model ESR ages of gypsum precipitation along the fault plane from Satpura Dungar in the Katrol Hill Range (KHR). This is recalculated as ~56 ka using improved alpha efficiency values (Nagar et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Optical Dating of Sediments in Khari River Basin and Slip Rate Along Katrol Hill Fault (KHF), Kachchh, India

et al. 2010

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Abstract:In the central region of Mainland Kachchh, Western India, the Katrol Hill Fault (KHF) is one of the major E-W trending faults. An understanding of the episodes of reactivation during the past has a bearing on the future seismicity in the region. These reactivations are manifested by offset of elevation of fluvial sediments and scarp-derived colluvium in the Khari River basin, SE of Bharasar (23º11'36.5"N, 69º35'22.6"E). Stratigraphic offsets of the sediments at this site suggest three episodes of reactivation of the KHF during the late Quaternary. Optical dating of samples from sediment strata and top layer of scarp-derived colluvium using Natural Sensitivity Corrected -Single Aliquot Regenerative (NCF-SAR) protocol suggested that these events occurred during the past ~30 ka, with the most recent historic episode around 3.0 ka. Given that a part of the slip recorded in the form of sediments offset, was lost due to erosion after faulting, a lower bound to the time averaged slip rate of the segment of KHF, is inferred to be > 0.23 mm/a during the past 30 ka.

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Section: Introductionmentioning

confidence: 99%

Optical Dating of Sediments in Khari River Basin and Slip Rate Along Katrol Hill Fault (KHF), Kachchh, India

et al. 2010

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“…This is also dependent on the residual aluminosilicate framework, which determines the chemical degradation of polymerized gel and their mechanical strength. The assignments of all IR peaks and shoulders are based on the references 26–29 …”

Section: Resultsmentioning

confidence: 99%

Sulfuric acid resistance of alkali/slag activated silico‐manganese fume‐based mortars

Nasir

Johari

Maslehuddin

et al. 2020

Structural Concrete

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The resistance of alkaline‐activated silico‐manganese fume (SMF) and blast furnace slag (BSF)‐based mortar, prepared by varying BFS and NaOHaq composition, during 20 weeks of exposure to 5% sulfuric acid (H2SO4aq) of initial pH = 0.24 and pure water (controlled) was studied. The deterioration was monitored by visual, alkalinity, mass, compressive strength and microstructural tests. The set of specimens synthesized included: (a) BFS‐free high alkaline, (b) SMF‐BFS blended high alkaline, and (c) SMF‐BFS blended mild alkaline system. Their residual strengths after 20 weeks of acid exposure were 20.1, 18.6, and 16%, respectively. BFS‐free specimens exhibited high resistance to acid attack due to the dearth of Ca in SMF. BFS‐admixed mild alkali system resulted formation of more gypsum and dealumination attributed to incomplete dissolution of Ca grains leading to severe spalling. BFS‐admixed high alkaline system underwent moderate resistance due to dense microstructure formed by additional C‐S‐H, K‐A‐S‐H, and C‐Mn‐H gel which enhanced retention of the polymerized framework.

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“…Ikeya et al, 1997;Nagar et al, 2010;Mahan and Kay, 2012). Here, we have used the average U, Th and K contents of six gypsum samples from South Australia (U = 0.12 ± 0.03 ppm, Th = 0.17 ± 0.04 ppm, K = 0.63 ± 0.12%) as reported by Nagar et al (2010) to calculate the gamma dose rate of gypsum layers in our core.…”

Section: S22 Correction For Gamma Dose Rate Heterogeneitymentioning

confidence: 99%

Extending the record of lacustrine phases beyond the last interglacial for Lake Eyre in central Australia using luminescence dating

Cohen

Arnold

2017

Quaternary Science Reviews

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We show with multiple luminescence dating techniques that the sedimentary record for Lake Eyre, Australia's largest lake, extends beyond 200 thousand years (ka) to Marine Isotope Stage (MIS) 7. Transgressive clayey sand and finely laminated clays overlying the Miocene Etadunna Formation in Lake Eyre North document the deep-lake phases of central South Australia in the past. Until now, unresolved chronology has hampered our ability to interpret these sedimentary records, which are important for understanding the timing of the wettest phase of central Australia's late Quaternary climate. In this study, we apply quartz optically stimulated luminescence (OSL) dating, thermally-transferred OSL (TT-OSL) dating and K-feldspar post infrared infrared stimulated luminescence (pIRIR) dating to lake-floor sediments near Williams Point in Madigan Gulf to provide new age constraint for the lacustrine sediments of Lake Eyre. Methodological studies on quartz and K-feldspar demonstrate that these luminescence dating procedures are suitable for the Lake Eyre lacustrine samples and produce consistent replicate ages. A Bayesian model applied to the new dating results provides a chronological model of lacustrine deposition and shows that the transgressive clayey sand were deposited 221 ± 19 ka to 201 ± 10 ka and that the deep-water sediments were laid down in early MIS 6 (191 ± 9 ka to 181 ± 9 ka). We also find evidence for a potential depositional hiatus in mid MIS 6 and the likely formation of a palaeo-playa later in MIS 6 from 158 ± 11 ka to 143 ± 15 ka. In contrast, the MIS 5 sediments are characterised by oscillating deep-and shallow-water lacustrine units deposited 130 ± 16 ka to 113 ± 20 ka. This study is the first of its kind to provide evidence for a wet desert interior in Australia beyond the last glacial cycle using comprehensive numerical dating. Our results show that past deep-lake episodes of central South Australia, which were previously thought to represent peak interglacial conditions, are actually associated with both warm interglacial and cold glacial periods, with all the wettest episodes generally coinciding with the intervening periods between the glacial and interglacial maximums. We assume from these results that orbital forcing is not a first order control for the long-term dynamics of the Lake Eyre basin and the Indo-Australian monsoon. The high lake-level events of Lake Eyre are well correlated with millennial-scale cooling events and stadials of the North Atlantic, and coincide with weakened episodes/events for the East Asia summer monsoon. This may imply an important role for the northern high latitudes in influencing the Indo-Australian monsoon, which may be associated with a southward migration of the Intertropical Convergence Zone (ITCZ) during cooling periods in the North Atlantic.

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Chronometry and formation pathways of gypsum using Electron Spin Resonance and Fourier Transform Infrared Spectroscopy

Cited by 24 publications

References 26 publications

Optical Dating of Sediments in Khari River Basin and Slip Rate Along Katrol Hill Fault (KHF), Kachchh, India

Optical Dating of Sediments in Khari River Basin and Slip Rate Along Katrol Hill Fault (KHF), Kachchh, India

Sulfuric acid resistance of alkali/slag activated silico‐manganese fume‐based mortars

Extending the record of lacustrine phases beyond the last interglacial for Lake Eyre in central Australia using luminescence dating

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