Granite Soils (Beaujolais Crus, Alsace Grand Crus, Cape Winelands, Northern Rhône)

WOSA describes plutons as dome-like intrusions of igneous magma into the earth's crust that formed at great depth and cooled slowly, which gives them a coarse crystalline (granitoid) texture; erosion later exposed them at the surface. In Alsace, Vins d'Alsace groups granite with gneiss: these eruptive or magmatic rocks crack and disintegrate into a coarse sand called granitic arena, with low water retention. It says the fertility of these soils depends on how far they have weathered, which releases mineral elements, and it calls them chemically acidic. The same body notes that sandstone is geologically fairly close to granite, with the same acidic and sandy character, but gives wines with a longer acidic spine that are less aromatic.

• Vins d'Alsace: granite and gneiss soils on the sides of the Vosges form coarse sand with low water retention
• Vins d'Alsace: soil fertility on granite depends on its degree of alteration, which releases mineral elements
• WOSA: soils derived from granite in the Cape are usually red to yellow and acidic, found on mountain foothill slopes and ranges of hills, with good physical and water-retention properties
• WOSA: the reddish and yellowish brown soils of the Cape's granitic hills, at 150 to 400 m, are highly weathered and acid, very stable and well drained, with a good water-holding capacity

In Alsace, Vins d'Alsace describes granite as the primitive platform: 150 million years ago the sea occupied what is now the Rhine Rift Valley, and sandstone, limestone and marl were deposited on top of it. It lists the Vosges mountains as granite and sandstone, sometimes shale. In the Cape, WOSA dates the Malmesbury Group shale and schists to some 1,000 to 550 million years ago, followed by intrusions of Cape Granite Suite plutons around 600 million to 500 million years ago. In Beaujolais, Inter Beaujolais says tectonic and magmatic processes at the end of the Tertiary Era thrust the land upwards, forming hills that erosion then shaped, and that Fleurie's pink granite is undergoing slow erosion.

• Vins d'Alsace: the Alsace side of the Rhine rift has three landscape units, the Vosges mountains (granite and sandstone, sometimes shale), the sub-Vosges hills and the Rhine alluvial plain
• WOSA: erosion exposed the Cape's granite plutons as dome-like mountains or hills such as the Paarl and Perdeberg mountains and the Darling hills
• WOSA: some exposed domes were flattened by erosion, covered by sandstone and eroded again, leaving sandstone mountains on a granitic base such as the Table and Simonsberg mountains
• Inter Beaujolais: at Fleurie, uneven weathering of the pink granite and soils of varying depths produce wines that differ from one year to the next

Writing in Decanter, Professor Alex Maltman argues that the major direct contribution of geology, confirmed by research in various parts of the world, is water supply: good drainage for the vines while storing enough water for dry periods. He notes that many different materials do this job, naming granite soils in the northern Rhône alongside gravels in Bordeaux and chalk in Champagne, and that much of the idea of Syrah suiting granite derives from where the variety first flourished, since Syrah now thrives in many soil types. Vins d'Alsace says wines from its granite soils are always very expressive in their youth, with a light structure. Inter Beaujolais says that on granitic soil Gamay produces powerful, deeply coloured wines, and at Fleurie it contrasts the more powerful wine of La Roilette, on more granitic soil, with the fruitier Grille-Midi.

• Maltman (Decanter): water supply is the major direct contribution of vineyard geology
• Maltman (Decanter): much of the Syrah and granite pairing derives from the geology where the variety first flourished
• Vins d'Alsace: wines from granite are very expressive when young, with a light structure
• Inter Beaujolais: at Fleurie, La Roilette grows on more granitic soil than Grille-Midi and gives a more powerful wine

In Beaujolais, Inter Beaujolais places the regional AOCs mainly in the south and the crus in the north, where the soil is often sandy and half granitic in origin. Chiroubles is listed as 100% pink granite, Fleurie as 90% pink granite, Morgon as 52% granite, and Moulin-à-Vent as granite with limestone, marl and sandstone. In Alsace, Vins d'Alsace lists granite as the soil of the Grand Crus Schlossberg, Brand and Wineck-Schlossberg, and describes Sommerberg's two-mica Turckheim granite. In South Africa, WOSA describes Swartland vineyards climbing the foothills of the Piketberg, Porterville, Riebeek and Perdeberg mountains, and its geology page names the Perdeberg and the Malmesbury hills among the Cape's exposed granite plutons. In the northern Rhône, Vins Rhône says the Hermitage hill is made up of granitic sand covered with mica-schists and gneiss, and that the deepest part of Condrieu's rocky outcrops is granite.

• Beaujolais (Inter Beaujolais): Chiroubles 315 ha, 100% pink granite; Fleurie 840 ha, 90% pink granite; Morgon 1,090 ha, 52% granite
• Alsace (Vins d'Alsace): Schlossberg 80 ha, 76% Riesling; Brand 57.95 ha; Wineck-Schlossberg 27.49 ha, 70% Riesling; Sommerberg 28.36 ha on Turckheim granite
• Swartland (WOSA): eight wards, including Malmesbury, Paardeberg and Paardeberg-South; the Perdeberg and Malmesbury hills are granite plutons usually surrounded by Malmesbury shale
• Northern Rhône (Vins Rhône): Les Bessards, a hilly granite terroir, is Hermitage's red terroir; Condrieu is made only from Viognier
• Slate for contrast: INCAVI describes Priorat's llicorella as slate, and the Consell Regulador of the DOQ Priorat describes the slate bed of its hillsides

Maltman explains in Decanter that a vine needs 14 nutrient elements besides carbon, oxygen and hydrogen, most of them metals such as potassium, calcium and iron, and that these start out locked inside the geological minerals of rocks and soil. Weathering can release some of them into the soil water beside the roots, but he says this is too slow to replace each season's nutrients, which is where humus, decayed organic matter, comes in. He adds that roots cannot absorb solids, that vines regulate the nutrients they take in, and that a typical wine holds only around 0.2% inorganic matter. His conclusion is that a mineral taste in wine credited to the vineyard ground should be thought of in terms of decayed vegetation rather than granite or slate.

• Maltman (Decanter): vine roots cannot absorb solids; nutrients must be in solution
• Maltman (Decanter): weathering releases nutrients from the parent rock too slowly to resupply each growing season; humus fills that role
• Maltman (Decanter): a typical wine contains only around 0.2% inorganic matter in total
• Vins d'Alsace: on granite, the release of mineral elements depends on the soil's degree of alteration

Inter Beaujolais lists Chiroubles, on 100% pink granite, with a floral nose of iris, lily, violet and peony, and credits its freshness to the granitic soil and sunshine. Fleurie shows iris, violet, rose, red fruit and vine peaches, with low acidity and gentle tannins. Moulin-à-Vent is described as tannic and structured, with blackcurrant, liquorice and wilted rose, and as a wine to cellar for ten years or more. In Alsace, Vins d'Alsace describes Schlossberg as light and floral, drawing freshness from its granite, with Riesling showing citrus and fresh herbs and a saline length. Brand gives a saline sensation with citrus and aromatic herbs, and Wineck-Schlossberg gives mineral and saline wines, with notes of gunpowder and wet stones in early vintages.

• Chiroubles (Inter Beaujolais): floral, iris, lily, violet, peony
• Fleurie (Inter Beaujolais): low acidity and gentle tannins
• Schlossberg (Vins d'Alsace): can easily be kept for twenty years
• Wineck-Schlossberg (Vins d'Alsace): at its best between five and ten years

Primary sources: https://www.beaujolais.com/en/a-world-for-every-beaujolais/pur-terroir-by-beaujolais/the-beaujolais-vineyard-a-mosaic-of-soils/, https://www.beaujolais.com/en/discover/nos-12-appellations/, https://www.beaujolais.com/en/appellation/fleurie/, https://www.beaujolais.com/en/appellation/moulin-a-vent/, https://www.beaujolais.com/en/appellation/chiroubles/, https://www.beaujolais.com/en/appellation/morgon/, https://www.vinsalsace.com/en/grands-crus/, https://www.vinsalsace.com/en/terroirs/remarkable-geology/, https://www.vinsalsace.com/en/grands-crus/schlossberg/, https://www.vinsalsace.com/en/grands-crus/brand/, https://www.vinsalsace.com/en/grands-crus/sommerberg/, https://www.vinsalsace.com/en/grands-crus/wineck-schlossberg/, https://www.wosa.co.za/The-Industry/Terrior/Geology/, https://www.wosa.co.za/The-Industry/Terrior/Soil/, https://www.wosa.co.za/The-Industry/Winegrowing-Areas/Winelands-of-South-Africa/, https://www.vins-rhone.com/en/cotes-du-rhone-cru-aoc-hermitage, https://www.vins-rhone.com/en/cotes-du-rhone-cru-aoc-condrieu, https://www.doqpriorat.org/en/territory/, https://incavi.gencat.cat/ca/coneix-el-vi-catala/denominacions-dorigen-catalanes/do-priorat. Last verified 2026-09-28