|Map of west coast subduction zone volcanoes. Image courtesy of the USGS.|
|Illustration of a subduction zone. Image courtesy of the USGS.|
When a plate composed mostly of oceanic crust goes toward a plate composed mostly of continental crust, the denser oceanic crust gets forced downwards into the Earth. This area is known as a subduction zone. As the denser oceanic plate moves downwards into the Earth it starts to heat up and eventually melt. That liquid rock rises up through the crust forming a string of volcanoes called a volcanic arc. The Cascade Range is such an arc with Lassen Peak representing the southernmost extent of the subduction zone.
There are many different types of volcanoes. Here is a view of Lassen Peak in the distance, rising up to 10,457 feet in elevation. It is so high that during our trip at the end of June it is still entirely covered in snow. Lassen Peak is what is known as a "Plug Dome", this forms when the lava is too thick to flow great distances. Lava rich in silica (quartz), has a higher viscosity (thickness) and doesn't flow as far as thinner, basaltic magma, which is hotter and has less silica content.
"Tres Rojas is our finest Red wine, made from a Reserve blend of three Bordeaux varietals, Cabernet Sauvignon, Merlot, and Cabernet Franc.
Our vineyards and winery are located in the mountains midway between Lassen National Park and Redding, CA, nestled in majestic pine forests. Our 2600' elevation, volcanic soils, steep terrain, and natural spring water provide ideal conditions for growing winegrapes. We use natural years fermentation in small French oak barrels to handcraft our rich and flavorful wines full of varietal character."