scholarly journals Lead and strontium isotopes as tracers for Early Formative pottery exchange in ancient Mexico

2021 ◽  
Vol 126 ◽  
pp. 105307
Author(s):  
Virginie Renson ◽  
Hector Neff ◽  
Antonio Martínez-Cortizas ◽  
Jeffrey P. Blomster ◽  
David Cheetham ◽  
...  
1989 ◽  
Vol 20 (2) ◽  
pp. 85-96 ◽  
Author(s):  
Gunnar Jacks ◽  
Göran Åberg ◽  
P. Joseph Hamilton

Strontium isotopes in precipitation, soil and runoff water can be used to establish a ratio of wet plus dry deposited Sr to Sr released by weathering. This ratio is especially enhanced in areas with old acid Proterozoic rocks (0.6-2.5 Ga) and Archean rocks (>2.5 Ga). Since Sr and Ca behave in an analogous way in the coniferous forest ecosystem the results for Sr can be used for the determination of Ca. If the deposition of calcium can be calculated reasonably accurately the weathering rate can also be estimated. Five catchments have been investigated using this approach. Three of them seem to be close to a steady state, wherein the losses and gains of calcium to the system are equal. In the two southern-most catchments there seems to be an ongoing loss of exchangeable calcium. The loss by runoff occurs with sulphate being the dominant anion. Weathering rates of 1.5 to 4.8 kg Ca/ha year have been estimated.


2017 ◽  
Author(s):  
Stearns A. Morse ◽  
◽  
S.R. Hart ◽  
Michael J. Jercinovic ◽  
Michael A. Hamilton ◽  
...  
Keyword(s):  

1968 ◽  
Vol 210 (2) ◽  
pp. 216-222 ◽  
Author(s):  
K. Debertin ◽  
W. Hagedorn ◽  
E. Rössle

2021 ◽  
pp. 1-14
Author(s):  
Douglas J. Kennett ◽  
Barbara Voorhies ◽  
Josue Gomez

We revisit the age and typological character of “Pox Pottery” that was reported in the 1960s by Charles Brush who considered it to be uniquely early (~2440 BC). Investigating the same two sites in coastal Guerrero where Brush excavated, we recovered Early Formative ceramics, some with the “pox” attribute. Here, we report potsherd frequencies for these deposits at both sites according to regional ceramic typologies, as well as AMS 14C dates used to establish a Bayesian stratigraphic chronology for each site to better constrain the age of these Early Formative period deposits. We argue that “Pox Pottery” is not a ceramic type per se and that the “pox” attribute occurs in multiple Early Formative period ceramic types. The earliest pottery is similar to other Red-on-Buff ceramic traditions from the Central Mexican Highlands and west of the Isthmus of Tehuantepec. Our chronological work demonstrates that these ceramics date between 1820 and 1400 cal BC, consistent with other recent studies indicating an early age of Red-on-Buff ceramics and suggesting shared cultural traditions distinct from the contemporary Locona interaction sphere that emerged in parallel.


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