Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.48212

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 48, 195–202 (2008)

SPECTROSCOPIC AND ANCIENT GEOMAGNETIC FIELD INTENSITY STUDIES ON ARCHAEOLOGICAL POTTERY SAMPLES, INDIA
C. Manoharan^a, K. Veeramuthu^a, R. Venkatachalapathy^b, T. Radhakrishna^c, and R. Ilango^d
^aDepartment of Physics, Annamalai University, Annamalainagar – 608 002, India
E-mail: cmanoharan1@rediffmail.com
^bC. A. S. in Marine Biology, Annamalai University, Parangipettai – 608 502, India
^cCentre for Earth Science Studies, Akkulam, Trivandrum – 695 031, India
^dDepartment of Physics, RKM Vivekananda College, Mylapore, Chennai – 600 004, Tamil Nadu, India

Received 11 April 2008; revised 5 June 2008; accepted 9 June 2008

Spectroscopic and paleointensity studies have been performed on archaeological pottery samples from Mayiladumparai, Tamilnadu, India. The clay mineral type and its level of structural deformation due to firing were studied from their Fourier Transform Infrared (FTIR) Spectra. The maximum firing temperature attained during baking, firing conditions (open/reduced atmospheric) and iron mineral phase changes were well established. Intensive rock magnetic properties on these samples were carried out in order to select the samples for paleointensity measurements. The results showed that all the samples were magnetically enhanced having superparamagnetic grains with Curie temperature of magnetite (580 ^◦C) and yielded mean paleointensity value of 48.71±0.16 µT.

Keywords: archaeological artifacts, FTIR and paleointensity

PACS: 33.20.Ea, 91.25.Dx, 75.30.Cr

ARCHEOLOGINIŲ INDIJOS PUODŲ ŠUKIŲ SPEKTROSKOPIJA IR SENOVĖS GEOMAGNETINIO LAUKO STIPRIO TYRIMAS
C. Manoharan^a, K. Veeramuthu^a, R. Venkatachalapathy^b, T. Radhakrishna^c, R. Ilango^d
^aAnamalai universitetas, Annamalainagar, Indija
^bAnamalai universiteto Jūrų biologijos aukštesniųjų studijų centras, Parangipettai, Indija
^cGeomokslų studijų centras, Akkulam, Trivandrum, Indija
^dVivekananda koledžas, Mylapore, Chennai, Tamil Nadu, Indija

Atlikti archeologinių puodų šukių pavyzdžių (Mayiladumparai, Tamilnadu, Indija) spektroskopiniai ir senovės magnetinio lauko stiprio tyrimai. Apie molio mineralinį tipą ir sandaros pokyčius dėl degimo spręsta iš Furje transformuotų infraraudonųjų (FTIR) spektrų. Patikimai nustatyti maksimali degimo metu pasiekta temperatūra, degimo sąlygos (atmosferinės ar riboto sąlyčio su oru) ir geležies mineralinių fazių kitimai. Intensyviai tirtos šių pavyzdžių uolienų magnetinės savybės, siekiant atrinkti pavyzdžius senovės magnetinio lauko intensyvumo matavimams. Rezultatai parodė, kad visi pavyzdžiai buvo magnetiškai aktyvūs, su superparamagnetinėmis granulėmis, kurių Kiuri temperatūra (580 ^◦C) tokia, kaip magnetito. Iš to seka vidutinė 48,71±0,16 µT senovės magnetinio lauko stiprio vertė.

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