In a non reactive bowl, combine marinade ingredients. Add shrimp, toss to coat, cover and refrigerate for 1 hour. Heat the 1/4 cup olive oil in a large skillet over high heat. Add the shrimp and saute, stirring and shaking the pan to prevent sticking, until cooked, about 5 minutes. Remove from heat and transfer shrimp to a large bowl to cool. When cool, chop shrimp coarsely.
Add tomato, green onions, lime juice, cilantro and salt to shrimp and toss to mix.
Preheat the broiler. Spread tortilla chips out in an oven proof platter. Spoon the black beans over the chips and sprinkle with cheese. Place under the broiler until cheese melts, about 5 minutes.
To serve, top with shrimp salsa.
c.1997, M.S. Milliken & S. Feniger, all rights reserved