The "zen circle" is the enso. The enso represents our unconditioned nature, to use the zen phrase, "your face before your parents are born." There's no connection with the chakras. Meditation on the chakras is connected with tantra, both Hindu and Buddhist, and more recently, theosophy. The dharmachakra refers to three cycles of teaching in Buddhism: the first on cause and effect, the second on emptiness, and the third on buddha nature. It has no connection to meditation on the chakras.
Having obtained the supreme freedoms
and conjunctions of the precious human existence,
endowed with faith, energy, and intelligence,
Having attended on a worthy spiritual friend
and received the pith of the holy instructions,
May we practice these properly, just as we have received them,
without obstacle or interruption.
In all our lives, may we practice and enjoy the holy dharma.