Senior U.S. and Soviet officials held talks Monday on current efforts to end the Iran-Iraq war and reach peaceful settlements to Middle East and southern Africa conflicts.

The major power consultations preceded a new round of U.S.-mediated talks on southwestern Africa Tuesday to Thursday between Angola, Cuba and South Africa.Earlier rounds involving senior government officials were held in London, Cairo and New York with military experts having a session in Cape Verde.

Chester Crocker, U.S. assistant secretary of state for African affairs, met at the Soviet diplomatic mission with his Soviet counterpart Anatoly Adamishin, a deputy foreign minister.

American officials said the two senior diplomats discussed such issues as a time frame for the withdrawal of 50,000 Cuban troops in Angola and independence for Namibia, or southwest Africa, which is still controlled by South Africa in defiance of U.N. resolutions.

Angola, Cuba and South Africa have accepted 14 "principles for a peaceful settlement in southern Africa," but those principles now have to be translated into detailed binding agreements.

Separate from the Crocker-Ada-mishin meeting were talks Monday and Tuesday between Richard Murphy, assistant secretary of state for near east and south Asia affairs, and his Soviet counterpart, Vladimir Polyakov.

American officials said Murphy and Polyakov met at the U.S. diplomatic mission just up the road from the Soviet compound.

Both sets of talks were part of a continuing superpower dialogue on regional issues which was begun after the first summit between President Reagan and Soviet leader Mikhail Gorbachev at Geneva in November 1985.