Sure, I don't always have the time, but today it's a good day to ask me for directions. Here's a map kind of covering my previous thoughs:

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As for eye shaped dorsals - they aren't stable. As the center part (the eye) grows, it will eventually shut down one of the dorsals from its magma source, hence closing down that rift. They can exist in the earlier continental rifts, and the present African Rift is one exampe, but will not remain in place all the way to the point that an ocean has already formed. You can read about failed rifts to understand it better - a good example is the Newark basin, as shown here:
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