9.3 South America — Argentina & Chile

South America — Argentina & Chile

Core Sommelier Competency: For the CMS Certified Examination, candidates must demonstrate complete fluency in the geographical, climatic, and varietal landscapes of South America's two viticultural giants: Argentina and Chile. Candidates must master the altitude dynamics and sub-regions of Mendoza (Luján de Cuyo vs. Uco Valley: Gualtallary, Paraje Altamira), the aromatic profile and genetics of Torrontés Riojano in Salta (Cafayate), the cooling mechanisms of the Humboldt Current in Chile, the 2011 East-West (Costa / Entre Cordilleras / Andes) classification, the historical rediscovery and ampelography of Carmenère, and iconic crus such as Puente Alto in Maipo and Apalta in Colchagua.

Separated by the majestic spine of the Andes Mountains, Argentina and Chile represent two distinct expressions of New World terroir. Argentina harnesses high-altitude, semi-arid Andean continental conditions on the eastern slopes, while Chile benefits from a protected, phylloxera-free Mediterranean-to-maritime corridor cooled by the Pacific Ocean on the western slopes.

1. Argentina: Viticultural Geography & Climate Dynamics

Argentina is the largest wine producer in South America and the fifth-largest globally. Viticulture is concentrated along a 1,500-mile western strip in the rain shadow of the Andes Mountains, stretching from Salta in the north ($24^\circ\text{S}$) to Chubut in Patagonia ($45^\circ\text{S}$).

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|                 ARGENTINA: FIVE PILLARS OF ANDEAN TERROIR                   |
|                                                                             |
|   [1. THE ANDES RAIN SHADOW & HIGH DESERT CLIMATE]                          |
|   - The Andes block Pacific moisture, creating an arid, semi-desert climate |
|     with annual rainfall of only 6 to 12 inches (150-300 mm). Low humidity  |
|     virtually eliminates fungal diseases, facilitating organic farming.     |
|                                                                             |
|   [2. HIGH-ALTITUDE VITICULTURE (800m TO 3,000m+)]                          |
|   - Solar Radiation: Extreme UV-B light at high altitudes stimulates vines  |
|     to produce thicker grape skins, packing wines with anthocyanins,        |
|     polyphenols, and deep purple pigment.                                   |
|   - Diurnal Temperature Swings: Scorching daytime sun is countered by       |
|     rapid night-time radiative cooling ($15°C to 20°C swings), preserving   |
|     crisp natural malic and tartaric acidity.                               |
|                                                                             |
|   [3. SNOWMELT IRRIGATION & RIVERS]                                         |
|   - Pure Andean snowmelt is channeled via historic canal networks           |
|     (acequias, pioneered by the indigenous Huarpe people) and modern drip. |
|                                                                             |
|   [4. THE ZONDA WIND HAZARD]                                                |
|   - A ferocious, hot, bone-dry Foehn wind that cascades down the eastern    |
|     Andes in spring/early summer. Can cause severe flower shatter (coulure) |
|     and desiccation.                                                        |
|                                                                             |
|   [5. CONVECTIVE SUMMER HAIL]                                               |
|   - Sudden summer thunderstorms unleash destructive hailstones. Growers     |
|     protect canopies using fine nylon mesh netting (mallas antigranizo).    |
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Argentine Wine Laws

Regulated by the Instituto Nacional de Vitivinicultura (INV):

• Indicación Geográfica (IG): Identifies wines from delimited geographic origins (e.g., Paraje Altamira, Gualtallary).
• Denominación de Origen Controlada (DOC): Traditional statutory appellations regulating yields, varieties, and aging (first established: Luján de Cuyo DOC in 1989 for Malbec, followed by San Rafael DOC).
• Labeling Rules: Minimum 85% of the stated variety, vintage, and geographic origin required.

2. Mendoza & Argentine Wine Regions

Mendoza Province (~70% of National Production)

Mendoza sits directly across the Andes from Santiago, Chile. Its alluvial soils consist of sandy loam over deep gravel, clay, and limestone layers deposited by the Mendoza and Tunuyán rivers.

+-----------------------------------------------------------------------------+
|                       MENDOZA VITICULTURAL DISTRICTS                        |
|                                                                             |
|   [1. PRIMERA ZONA (CENTRAL MENDOZA: 800m - 1,100m)]                        |
|   - Luján de Cuyo DOC: Historic Malbec cradle (Agrelo, Perdriel, Las        |
|     Compuertas, Vistalba). Alluvial clay loam; plush, velvety, dark plum,   |
|     violet, sweet tobacco, chocolate, ripe tannins.                         |
|   - Maipú: Warmer, lower altitude (Lunlunta, Barrancas); full-bodied reds,  |
|     Cabernet Sauvignon, Syrah, Old-Vine Malbec.                             |
|                                                                             |
|   [2. UCO VALLEY (VALLE DE UCO: 1,000m - 1,600m+)]                          |
|   - High-elevation Andean benchlands with intense UV light & cool nights:   |
|     * Tupungato (Gualtallary): 1,300-1,600m; caliche-coated gravels; linear,|
|       high-acid Malbec, Cabernet Franc, Chardonnay (Catena Zapata, Zuccardi)|
|     * Tunuyán (Vista Flores, Los Chacayes): Rocky alluvial fans; Syrah/Malbec|
|     * San Carlos (Paraje Altamira, La Consulta): Famous alluvial limestone- |
|       rich gravels; floral, mineral, chalky tannins, intense tension.       |
|                                                                             |
|   [3. SOUTHERN MENDOZA]                                                     |
|   - San Rafael DOC & General Alvear: Cooler southern plain; Chenin Blanc,   |
|     Malbec, Cabernet Sauvignon (Bodegas Bianchi).                           |
|                                                                             |
|   [4. NORTHERN & EASTERN MENDOZA]                                           |
|   - Lavalle, San Martín, Rivadavia: Low-elevation, high-volume irrigation   |
|     plains; historical home of pink Criolla Grande and Cereza.              |
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Other Argentine Wine Provinces

• Salta & The Calchaquí Valleys (Northern Region):
  • Located in the extreme northwest at latitudes $24^\circ\text{S}$–$26^\circ\text{S}$. Vineyards sit at the highest commercial altitudes on Earth (1,600m to over 3,111m at Bodega Colomé's Altura Máxima).
  • Cafayate: Epicenter of Torrontés Riojano (an indigenous natural cross of Criolla Chica [Mission/País] × Muscat of Alexandria). Delivers exuberant, perfumed aromatics of white jasmine, orange blossom, geranium, white peach, and lychee, accompanied by a surprisingly crisp, bone-dry, refreshing palate.
  • Salta Malbec and Tannat are deeply inky, full-bodied, and densely structured with black fruit and graphite.
• San Juan & La Rioja:
  • San Juan (Tulum, Pedernal Valley) is Argentina's second-largest wine province, producing Syrah, Bonarda, and base wine for distillation. Pedernal Valley (1,400m) produces exceptional high-altitude Syrah and Malbec.
  • La Rioja (Famatina Valley) produces aromatic Torrontés and Criolla.
• Patagonia (Southern Region):
  • Latitudes $38^\circ\text{S}$–$45^\circ\text{S}$; lower altitudes (250–400m) compensated by southern polar proximity. Defined by long summer daylight, low rainfall, and relentless, dry Patagonian winds.
  • Río Negro: Alluvial valley with cool climate; benchmark for elegant, earthy, old-vine Pinot Noir, Malbec, and Sémillon (Bodega Chacra, Bodega Noemía).
  • Neuquén & Chubut: Emerging cool-climate frontiers specializing in Pinot Noir, Chardonnay, and traditional method sparkling wines.

3. Chile: Viticultural Geography & Climate Dynamics

Chile is a narrow, 2,700-mile ribbon of land bounded by four impenetrable natural barriers:

1. North: The arid Atacama Desert (the driest desert on Earth).
2. East: The towering Andes Mountains (rising over 20,000 ft).
3. West: The Pacific Ocean.
4. South: The frozen icefields of Patagonia and Antarctica.

+-----------------------------------------------------------------------------+
|                 CHILE: THE PHYLLOXERA-FREE VITICULTURAL FORTRESS            |
|                                                                             |
|   - Strict natural geographical barriers and strict quarantine laws have    |
|     kept Chile completely FREE of Phylloxera vastatrix.                     |
|   - 100% of Chilean vineyards are planted on their own natural UNGRAFTED    |
|     Vitis vinifera rootstocks, resulting in remarkable vine longevity.      |
|   - The Cold Humboldt Current: Sweeps northward from Antarctica along the   |
|     Chilean coast, generating cool ocean breezes and morning fog            |
|     (camanchaca) that moderate daytime coastal temperatures.                |
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Chilean Wine Laws & Appellation Hierarchy (1995 Decree No. 464)

• Denominación de Origen (DO): 75% minimum requirement for varietal, vintage, and DO origin for domestic wines, but an 85% minimum is universally observed by all commercial wineries for EU export compliance.
• The 2011 East-West Terroir Classifications:
  1. Costa (Coast): Maritime-influenced western areas lying along the Coastal Mountain Range or river mouths; cooled by the Humboldt Current; granitic/schist soils; crisp Sauvignon Blanc, Chardonnay, Pinot Noir, cool Syrah.
  2. Entre Cordilleras ("Between the Ranges"): Warm central valley floor between the Coastal Range and the Andes; deep alluvial clay and gravel; represents ~80% of total plantings; benchmark Cabernet Sauvignon, Carmenère, Merlot, Syrah.
  3. Andes: Mountain foothills in the Andean piedmont; high altitude, intense sun, cooling night breezes (katabatic winds), volcanic and colluvial soils; elegant, structured Cabernet Sauvignon, Syrah, Cabernet Franc.

                 [CHILE'S 2011 EAST-TO-WEST TERROIR MATRIX]

   (West - Pacific Ocean)     (Central Valley Floor)     (East - Andes Mtns)
   ----------------------     ----------------------     -------------------
         [COSTA]               [ENTRE CORDILLERAS]             [ANDES]
   - Humboldt Current Fog     - Warm Mediterranean       - High Altitude Foothills
   - Granite / Schist         - Alluvial Clay / Loam     - Volcanic Colluvium
   - Sauvignon Blanc,         - ~80% of Production       - Katabatic Night Winds
     Chardonnay, Pinot Noir   - Cabernet, Carmenère      - Structured Cabernet

Chile's Signature Grape: Carmenère

• Historical Background: An ancient Médoc variety nearly abandoned in Bordeaux following the 19th-century phylloxera epidemic. Transported to Chile in the mid-1800s, it was grown for over 140 years mistaken as a late-ripening clone of Merlot (termed Merlot Chileno or Merlot Peullu).
• Rediscovery: In 1994, French ampelographer Jean-Michel Boursiquot definitively identified the vines as true Carmenère at Viña Carmen. Chile officially recognized Carmenère as a distinct variety in 1998.
• Organoleptic & Viticultural Markers: Late-budding and extremely late-ripening (harvested 3–4 weeks after Cabernet Sauvignon). Requires warm sunny sites to avoid excessive pyrazines (green bell pepper, jalapeño). When fully ripe, it yields deep, opaque purple wines with silky, low-to-medium tannins, lush blackberry, blueberry, dark chocolate, tobacco, soy sauce, black pepper, and roasted red pepper notes. Benchmark region: Peumo in the Cachapoal Valley.

4. Chile's Premier Viticultural Valleys

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|                      CHILE: KEY VITICULTURAL VALLEYS                        |
|                                                                             |
|   [COQUIMBO REGION]                                                         |
|   - Limarí Valley: Rare limestone/calcareous soils + Humboldt fog           |
|     (camanchaca); benchmark mineral Chardonnay and cool-climate Syrah.      |
|   - Elqui Valley: Northernmost fine region; high-altitude Syrah & Sauv Blanc|
|                                                                             |
|   [ACONCAGUA REGION]                                                        |
|   - Aconcagua Valley: Warm interior valley (Viña Errázuriz, Seña, Chadwick);|
|     Bordeaux blends, Syrah.                                                 |
|   - Casablanca Valley: Pioneer cool-climate coastal region (granite soils,  |
|     Humboldt fog); crisp Sauvignon Blanc, Chardonnay, Pinot Noir.           |
|   - San Antonio Valley & Leyda Valley: Ultra-cool coast (4km from ocean);   |
|     pure maritime granite; piercing, saline Sauvignon Blanc and Pinot Noir. |
|                                                                             |
|   [CENTRAL VALLEY REGION (VALLE CENTRAL)]                                   |
|   - Maipo Valley: The historic cradle of Chilean wine. Famous for           |
|     exceptional Cabernet Sauvignon with cassis, mint, and eucalyptus notes. |
|     * Alto Maipo Crus: Puente Alto (Don Melchor, Almaviva, Chadwick), Pirque|
|   - Rapel Valley: Subdivided into:                                          |
|     * Cachapoal Valley: Home to Peumo (Chile's premier Carmenère terroir)   |
|     * Colchagua Valley: Warm Mediterranean; Apalta amphitheater (Montes     |
|       Alpha M, Clos Apalta), Marchigüe, Los Lingues.                        |
|   - Curicó Valley: Large productive basin (Teno and Lontué sub-valleys).    |
|   - Maule Valley: Chile's oldest wine region; dry-farmed bush vines:        |
|     * VIGNO (Vignadores de Carignan): Min. 65% dry-farmed 30+ yr old        |
|       Carignan, aged min. 2 years. Also heritage País.                      |
|                                                                             |
|   [SOUTHERN REGION (SUR)]                                                   |
|   - Itata Valley & Bío Bío Valley: High rainfall, volcanic soils; historic  |
|     old-vine País, Cinsault, and Muscat of Alexandria.                      |
|   - Malleco Valley: Cold, wet, southern frontier; high-tension Chardonnay.  |
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The Premier Crus of Maipo Valley

• Alto Maipo (Andean foothills, 400–800m elevation): Cooled by katabatic mountain winds descending each night from the Andes, creating great diurnal range. Deep alluvial gravels over clay along the Maipo River basin.
  • Puente Alto DO: The premier Grand Cru of Chilean Cabernet Sauvignon. Produces wines with profound blackcurrant purity, dried mint, eucalyptus, cedar, fine graphite, and polished, architectural tannins. Historic benchmark estates include Concha y Toro (Don Melchor), Baron Philippe de Rothschild & Concha y Toro (Almaviva), and Errázuriz (Viñedo Chadwick).
  • Pirque DO: Slightly higher altitude and cooler than Puente Alto; famous for spicy, herbaceous, fresh-tannin Cabernet Sauvignon (Santa Rita Casa Real).