So let's discuss this ringwoodite and olivine and how they are formed shall we? Shall we discuss the heat and pressure needed???
OK
Ringwoodite is a polymorph of Olivine, a pretty standard
mafic mineral in basalts, such as we have in the mantle.
Shall we then ask how those materials ended up in comets of "claimed" ices, when every probe has reported hot and dry surfaces with but a trace of frost?????
I was not aware that Ringwoodite came from
comets. Remember, Ringwoodite and olivine in general is a normal phase that forms in basaltic rocks.
It is the Mg end of the Mg-Fe continuum that makes up the Olivine series. It is Mg2SiO4.
It comes out of mafic magmas at a relatively high temperatures according to the Bowen Reaction Series (we can get into deeper discussions of how detailed the Bowen Series actually is, but for now it's a good starting point)
There is no need for "comets" to bring ringwoodite to earth that I am aware of.
The debate, as I understood it, was between water coming to earth from comets versus more "juvenile water" from magmas. In this case the hydrous ringwoodite would carry water in its crystal structure which, upon the right conditions of temperature and pressure would
dehydrate from the ringwoodite.
Or shall we ignore that, and pretend all is well in wonderland where Fairie Dust reigns supreme?
You don't seem to even be talking about minerals most of the time. I honestly have no idea what you are on about here.
Comets, which were the claimed source for water
-ahem-
hypothesized source for water....
, being abandoned by scientists, with no explanation except that a form of mineral can contain it, but not create it. But we do know one way water can be created, don't we???? I'll let you figure that one out yourself, since you want to talk about ringwoodite and the water it contains.
Ahh, now I think I see your confusion. The ultimate question of where the water various hydrous phases contain came from may still be in play, but remember:
COMETS EXIST IN THE UNIVERSE. WATER EXISTS IN THE UNIVERSE APART FROM THE PLANET EARTH.
Water (H2O) is NOT UNIQUE to earth.
When the earth formed either it also coalesced with H2O (probably as ice, but since these are warmer bodies it was hypothesized for water to be harder to stick around here) or the water was brought to the earth through comets and asteroids, but either way the Ringwoodite and the mantle transition zone
can apparently act as a "reservoir" of sorts within the earth's overall hydrologic cycle.
THIS article indicates that the earth may have been "born" with its water already in place (
Nature, 2013) based on the water content of lunar rocks which would effectively "lock in" the signature of the water sources from the earth from which it formed. And since both the moon water (which is locked up in mineral phases) and earth water share commonalities in isotopic signatures it is likely that the earth already had its water when the moon was formed. But even then, there's still a lot of questions about the relative amount of heat and what it would do the water. There's even an hypothesis about water being brought in to the early planetary disks by Jupiter's gravity pulling in bodies from the outer part of the disk (hydrous phases in carbonaceous chondrites).
Where did all water ULTIMATELY come from? Well, the same place that EVERYTHING came from: space. We are made up of rocks and chunkers that accreted in the disk around our star and formed planets. They've found water out in outer solar system (
HERE)
I don't believe anyone is saying that the water was necessarily
synthesized in the mantle of the earth.
THIS ARTICLE form the JPLseems to call into question the cometary water hypothesis based on the
isotopes of Hydrogen in Hale Bopp and other comets' water vapor. It shows a higher level of
deuterium than we see in our own water supply.
Right now, as I understand it, the "bolide hypothesis" of water being brought in from elsewhere is not "DOA". Right now the problems are more around the isotopic signatures on comet water vs what we have on our water on earth.
I honestly don't see why you are making such grand claims that scientists are somehow abandoning bolide hypotheses for water coming to earth. You sound more like a creationist who finds someone using a negative term in an evolution paper to make grand claims about how evolution is washed up and no one believes it anymore!
Oops! I've already put in more detail into this one post than you will address. By all means feel free to ignore all the detailed SCIENCE and party on with the electric universe.