 |
| Titel |
A geofingerprint of the parent material-soil-wine chain in a high quality terroir. A first approach on Piedirosso vineyards, Campi Flegrei, southern Italy |
| VerfasserIn |
Mariano Mercurio, Eleonora Grilli, Elio Coppola, Maurizio de Gennaro, Vincenzo Morra, Thomas Prohaska, Andrea Buondonno, Alessio Langella |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053270
|
|
|
|
|
|
| Zusammenfassung |
| KEYWORDS: geofingerprint, strontium isotope ratio, applied pedology, Piedirosso vineyard,
Campi Flegrei
This work encompasses the results of an interdisciplinary research involving geologists,
chemists and pedologists, aiming at identifying a ‘geofingerprint’ univocally linking the wine
to its origin, namely, the Piedirosso vineyards growing on Campi Flegrei volcanic area. Since
ancient times vineyards were cultivated in this volcanic field as a consequence of its favorable
climatic conditions and soil suitability, both contributing to the generation of a high quality
wine terroir. The potassic alkaline volcanism of Campi Flegrei was characterized by the
emplacement of a large amount of pyroclastic deposits and minor lava flows. Their genesis is
mainly due to two caldera forming processes linked to two high energy events: the
Campanian Ignimbrite eruption (CI) dated at about 39,000 ybp and the Neapolitan
Yellow Tuff (NYT) eruption (15,000 ybp). The investigated site evolved on eruptive
products following the NYT eruption and ascribed to the so-called Third Phlegraean
Period (8,000-500 ybp). The focal point of this research was the identification of the
soil-vineyard-must chain by correlating elements distribution and isotopic ratios
from geological parent material to ending wine must. To this aim, a representative
soil/Piedirosso vineyard system was identified and characterized including soil
profile horizons. Samples from each soil horizon as well as from vine branches,
leaves, grapes and must were collected and analyzed. All samples were analyzed by
MC-ICP-MS to determine their 87Sr/86Sr isotopic composition, by ICP-QMS to measure
Li, Be, B, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, As, Se, Rb, Sr, Mo, Ag, Cd, Ba, Tl, Pb,
Bi, U and REE, and by XRD for the qualitative evaluation of the mineral phases
occurring in soil samples. The soil profile exhibits an Ap-Bw-BC-CB-C horizonation.
The color varies from dark brown in Ap to very dusky red in C. Rock fragments
(Ø>2mm) represent 10-15% of total volume. The texture is generally sandy loam. Water
pH value ranges from weakly acid (5.2-5.8) in surface horizons to neutral (7.2)
in depth along soil profile. For all horizons the phosphate retention, the Cation
Exchange Capacity and the content of allophanic materials are very low, while the bulk
density is high. The profile is classified as Vitrandic Haploxerepts (USDA-NRCS,
2010). By Land Suitability analysis, soil belongs to S1 class highly suitable for
vineyards.
Our study clearly shows that any interpretation of the elements distribution from both
geological and pedological standpoints was not possible so far, whereas the use of a
petrogenetic tracer such as 87Sr/86Sr isotopic composition provided encouraging responses.
In fact, the values of such ratio within the entire chain studied vary from 0.7076 to 0.7084,
thus falling in the typical range for volcanites of Campi Flegrei (0.7065-0.7086). These
results currently represent the unique study focusing on a geotracer, such as the 87Sr/86Sr
isotopic ratio, useful to identify the Campanian wine-producing chains from soil to ending
product. |
|
|
|
|
|
|