New Delhi, April 13 -- Global oil prices jumped above 100 US dollars a barrel as energy markets reopened in Asia after US announced blockade of Iranian ports. Global benchmark Brent crude is up by 8.5 percent at 102.37 US dollars a barrel, while West Texas Intermediate is 9 percent higher at 105.34 US dollars a barrel. Major stock indexes in Asia slipped in trade today. The Nikkei 225 in Japan fell by 0.8 percent, while South Korea's Kospi was down by 1.8 percent. The failure of US-Iran negotiations at the weekend has raised concerns that the global energy crisis will deepen. In recent weeks, both energy and financial markets worldwide have experienced significant volatility as investors respond to ongoing developments in the conflict. La...