Chiasmata termininaliztion occurs in

Chiasmata terminalization refers to the movement of chiasmata (the points where crossing over has occurred between homologous chromosomes) towards the ends of the chromosomes.

This process is a key feature of the Diplotene stage of Prophase I in meiosis.

During Diplotene, the homologous chromosomes begin to separate but remain attached at chiasmata, which gradually move toward the telomeres — a process known as terminalization.

Pachytene is the stage where crossing over occurs, Zygotene is when synapsis starts, and Leptotene is the initial stage where chromosomes begin to condense.

Therefore, chiasmata terminalization specifically occurs during Diplotene.