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Determination of Chlorine Contents in Geological Survey of Japan Reference Materials by Prompt Gamma Neutron Activation Analysis (2004)

Sano, Takashi ; Fukuoka, Takaaki ; Hasenaka, Toshiaki

Oxford, UK : Blackwell Publishing Ltd

Geostandards and geoanalytical research 28 (2004), S. 0

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ISSN: 1751-908X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: We determined chlorine contents in nine GSJ (Geological Survey of Japan) reference materials (JB-1, 1a, 2, 3; JA-1, 2, 3; JR-1, 2) by prompt gamma neutron activation analysis, employing the standard addition method. Pressed powder disks of each reference material were used for neutron irradiation and gammaray measurement, after known quantities (25-200 μl) of sodium chloride solution were added. The influence of the nearby sodium peak overlap was checked, and fluctuations in the chlorine count rate were corrected using silicon as an internal standard. The slopes of calibration lines for seven reference materials (JB-1, 2, 3; JA-1, 2, 3; JR-2) and SiO2 powders fall within 5% error, and their chlorine values were obtained from the intercepts. Chlorine contents in JB-1 a and JR-1 were also determined by using the calibration lines. Our chlorine values ranged from 26.1 to 934 μg g-1, which agrees well with the previously reported values.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1751-908X.2004.tb00762.x

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Chemical Characteristics of Obsidian from Archaeological Sites in Western Mexico and the Tequila Source Area: Implications for Regional and Pan-Regional Interaction Within the Northern Mesoamerican Periphery (1993)

Trombold, Charles D. ; Luhr, James F. ; Hasenaka, Toshiaki ; [et al.]

New York : Cambridge University Press

Ancient Mesoamerica 4 (1993), S. 255-270

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ISSN: 0956-5361

Source: Cambridge Journals Digital Archives

Topics: Archaeology

Notes: AbstractA total of 51 obsidian samples from archaeological sites in western Mexico (La Quemada, Totoate, Las Ventanas, Laguna San Marcos) and from the Tequila source area were analyzed chemically by direct-current plasma atomic emission spectrometry (DCP) and instrumental neutron activation analysis (INAA) in an effort to identify the sources of the archaeological obsidian by step-wise discriminant analysis of the data. Surprisingly, only 3 of the 39 archaeological samples (2 from Laguna San Marcos and 1 from Las Ventanas) could be correlated with a Volcán Tequila source (Teuchitlan). Four other groups of archaeological obsidian were recognized. The largest, Group Y, was found to be derived from the La Lobera source located near the Jalisco–Zacatecas border. This source accounted for 12% of La Quemada obsidian and a higher proportion for Las Ventanas and Totoate. Source locations for the remaining three groups could not be determined from the existing chemical data base. These results could indicate that a minimum of interaction took place between La Quemada and the Teuchitlan cultural tradition. It shows that one focus of La Quemada's trade endeavors was in the Río Bolaños/Tlaltenango valleys. This study also indicates that organized obsidian trade between the Mexican core and its outer periphery was probably not a factor between a.d. 400 and 800.