Radiocarbon Dating is used on organic objects only, so the fact that your whole example is based on inorganic rocks and radio carbon dating only suggests that you do not know with any detail or understanding the topic that you are discussing.
There are 2 calories in 1 cup of Unsweetened Iced Tea. Calorie breakdown: 0% fat, 97% carbs, 3% protein.
Well, not at Starbucks. There, your tall iced coffee (unless ordered unsweetened) contains a shot of simple syrup and around 90 calories. The website does note this, as Newsday reports; the iced coffee is described as a Starbucks Terraza Blend, served chilled and slightly sweetened on ice..