Lemon Curd Marbled Cheesecake

Name: Lemon Curd Marbled Cheesecake
Ingredients: 1 teaspoon finely grated fresh lemon zest; 1/2 cup fresh lemon juice; 1/2 cup sugar; 3 large eggs; 1/2 stick (1/4 cup) unsalted butter, cut into small pieces; 1 1/3 cups finely ground graham cracker crumbs (5 oz); 1/3 cup sugar; 1/8 teaspoon salt; 5 tablespoons unsalted butter, melted; 3 (8-oz) packages cream cheese, softened; 1 cup sugar; 3/4 cup sour cream; 1 teaspoon vanilla; Accompaniment: blueberries; a 9- to 91/2-inch (24-cm) springform pan