Dolomite discovery ends 100-year treasure hunt

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Frankie

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Here is an interesting article someone turned me onto Boomer I thought you would like. Maybe start a discussion on it? How important to our hobby is this red algae?

(PhysOrg.com) -- The century-old mystery of a missing mineral in coral reefs has been solved by a team from The Australian National University.
The team, led by Dr. Bradley Opdyke of the Research School of Earth Sciences, has uncovered a hidden stash of the mineral dolomite in coral reefs around the globe, ending a search that has lasted over 100 years.
The discovery was published in November’s Biogeosciences.
“For over a century scientists have puzzled over the ‘dolomite problem’ – the mystery surrounding the abundance of dolomite in fossil reefs and its apparent absence from modern reefs,” said Dr. Opdyke.
“We have discovered that dolomite is in fact present in large quantities in modern coral reefs, but from an unexpected source.”
The team’s eureka moment came when they found large quantities of dolomite packed inside a ‘reef builder’ species of red algae, Hydrolithon onkodes.
“There was dolomite on the reefs all along, but it was hidden within these algae,” said Dr. Opdyke.
“This species of algae is found in abundance on reefs around the world. The algae work with coral to ‘cement’ the reef structure to withstand the tremendous hydraulic pressure of waves.
“This is the first discovery of dolomite associated with a living organism.”
Student Marinda Nash and Dr. Uli Troitzsch made the surprise discovery while investigating the effects of climate change on red algae.
“The discovery was completely serendipitous – we were working on an unrelated question at the time,” said Dr. Opdyke.
“When we confirmed the finding I said to Marinda, ‘This is going to be huge’. It opens up a kaleidoscope of future research topics.”

Provided by Australian National University

More: Dolomite discovery ends 100-year treasure hunt


dolomitedisc.jpg
 
We will do that Frank, as there is allot more to Dolomite than that and by far that is not the big reason behind dolomite :)
 
I have not forgotten this Frank but was just informed early today, to my surprise, Tony Vargas and friend are driving all the way from Nebraska for a few hr visit so need to do ****.
 
No worries boomer, sounds like an interesting day ahead of you :) send my regards!

I ended up at a Polish party last night with the wife:dizzy: and still need to get a video going of my new skimmer for my thread. Heading to the beach right now for saltwater. Monday I am going back upstate to Fairfield SC to hunt deer for 4 days before the season is over and then it's back to the web for me until spring. So take your time!

I am very interested in learning what you have on dolomite, When you told me about using it in my Ca/RX way back I started to get the coralline algae growing back in my tank, after it all disappeared from doing the zeovit.

Now this discovery of dolomite being found packed in this red algae gives me insight as to how my ultra low nutrient system may have invariantly been removing needed minerals, (through the ion exchange in the zeolite?) and why my coralline died off.
 
First Frank, just a tease here. These researchers are already scrambling to correct some of their remarks due to their post hole digging.

This Dolomite discovery ends 100-year treasure hunt statement is so bad it is not even worthy of a comment. They are flat out implying they have solved the mystery to Dolomite rock formation which is just so silly. One BIG case in point. I use to look at 50 -100 train load cars of Dolomite on the avg of every other day for 2 decades :). This dolomite was fossiliferous mostly of major reef building corals like Favida or Sylinids. I use to collect them and give them to guys at work for their kids. Most major Dolomite formations are due to the alteration of Limestone by a process called Dolomitization. This process can take place in either FW or SW Limestone deposits. These guys obviously have never heard of the famous Sabkha Flats. You can not take a recent bio event such as this claim and then just flatly extrapolate it to the geological history of dolomite formation, with not a shred of evidence.

So what do we know for sure ? Can some algae can produce Dolomite, Yup. Is there evidence of algae like this in geologic past, Yup. Is there any evidence to any reef building Dolomite formations in the geologic past attributed to algae like this, for making such massive deposits, Nope. Then ask yourslf the question how wide spread is the Algae they are looking at ? Well, here is a map that is pretty much self-explained of the 5 known species of Hydrolithon sp.

map_of_Hydrolithon.jpg
 
Its really depressing how much JUNK science is out their now?? worse the politics


Mojo
 
on another note dolomite is suppose to be a great media for cal. reactor so I've been told, where do you get it if this true
 
Guerry

You can get it from many landscaping business, but it is to big and needs to me ground up. The best in this hobby so far is the Activate Dolomite sold by the Zeovit people called Zeomag

Zeovit Magnesium Granules

Activated Dolomite does not have the dissolution issues that others do. Meaning, you do not need to lower the pH more in the reactor as one does for natural Dolomite. ZeoMag is also a more pure Dolomite as many of the so called Dolomite's are really Dolomitic Limestone, where the % of mineral Dolomite can vary greatly. What ever the case may be, no more than 10 % by vol of the reactor media should be Dolomite for a first start up. There is one BIG reason for this. The mineral Dolomite is Ca, Mg(CO[SUB]3[/SUB])2. This part (CO[SUB]3[/SUB])2 means unlike Aragonite (CaCO[SUB]3 > [/SUB](CO[SUB]3[/SUB])1 ) it has 2 and not 1 Alk component. If one used 100 % Dolimnte in the reactor the Alk would be through the roof. You should never try to raise the Mg++ with Dolomite. Its real purpose is once you have the Mg++ where it should be you can use the Dolomite to keep it there without adding sups. I introduced the use of Dolomite in reactors almost 20 years ago :)

Dolomite Table I did long ago.

> 90 % Calcite & 0 - 10 % Dolomite = Limestone

90 -50 % Calcite & 10 -50 % Dolomite = Dolomitic Limestone

10 - 50 % Calcite & 90 - 50 % Dolomite = Calcitic Dolomite

0 - 10 % Calcite and > 90 - 100 % Dolomite = Dolomite > 90 % Calcite & 0 - 10 % Dolomite = Limestone

90 -50 % Calcite & 10 -50 % Dolomite = Dolomitic Limestone

10 - 50 % Calcite & 90 - 50 % Dolomite = Calcitic Dolomite

0 - 10 % Calcite and > 90 - 100 % Dolomite = Dolomite (Dolostone)



Increasing in Dolomite--->> <<<-------Increasing Calcite

LS---------DL-----------DL-CL-------------------------------CL--D

Calcite 0--10-------------50---------------------------------90--100 % Dolomite (Dolostone)
 
Frank

These guys obviously have never heard of the famous Sabkha Flats.

Lots of this in my books but I had no good links so looked today. Obviously these guys never read this and it is 2010. You do not see these guys jumping the gun saying Dolomite discovery ends 100-year treasure hunt. Just look at the conclusion. I know it is really deep for you.

Dolomite formation within microbial mats in the coastal sabkha
of Abu Dhabi (full pdf)
http://www.climategeology.ethz.ch/publications/2010_Bontognali_et_al.pdf
 
An a import note:

For decades sedimentary petrologist have tried to get that bad name changed, Dolomite and replaced it with Dolostone. But the use of it is so common even today it may never get changed. Calling this rock Dolomite makes about as much sense as calling Limestone--> Calcite. Dolomite is a mineral, just like Calcite, Aragonite, Quartz, Gypsum, etc. are minerals. You never call a large geologic formation by its mineral name 99 % of the time.
 
thanks for the info Boomer, I'm on Zeo strike since removing zeo from my system LOL but any way I do use what I believe to be same type of product from Brightwell Coral Lazarus which I mix in my reactor at the 10% rate
 
Frank

These guys obviously have never heard of the famous Sabkha Flats.

Lots of this in my books but I had no good links so looked today. Obviously these guys never read this and it is 2010. You do not see these guys jumping the gun saying Dolomite discovery ends 100-year treasure hunt. Just look at the conclusion. I know it is really deep for you.

Dolomite formation within microbial mats in the coastal sabkha
of Abu Dhabi (full pdf)
http://www.climategeology.ethz.ch/publications/2010_Bontognali_et_al.pdf

Great link Boomer. I need some time to digest it.

From what there telling us though, Dolomite is formed not on the surface (as the article I presented suggests through the algae) but more so from sedimentary evaporations that continue to form dolomite long after being buried. Did I read that right?

I will read the rest and try to wrap my brain around it better.

Guerry, you can get dolomite from your LFS. It was used as a substrate in the 70's and 80's for freshwater aquariums. Estes puts it out. I paid $20 for two 40lb bags.
I tried the zeomag before getting the Estes and it worked just fine also. Same stuff from what I could tell on a visual. Zeomag may have been a bit more bright in color was all.
Why you on a zeo strike!? LOL! I thought it was working fine for you.
All these blue bottles are basically the same stuff we can get elsewhere, they just make it easier to get is all. I think we now know what is in those bottles. ;) If you stick to the basic 4 and do nothing else you will have a killer system.
I think Mike is onto something though about the carbon source for that system, we need to start a new thread on this topic though~


Edited:
I am finding it interesting that they are talking about the Precambrian and that dolomite formation has declined into our present Phanerozoic Eon. Great Article boomer!
 
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Boomer,
in your article they are talking about "buried microbial mats". What is this mat they are talking about? Is it not the Algae talked about in the article I provided? or is it something else?

Another thing that stands out to me is the temperature. 50 degrees Celsius. 50x1.8+32=122f! Our earths cooling explains a lot on why we do not find these formations in abundance any longer.
 
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From what there telling us though, Dolomite is formed not on the surface (as the article I presented suggests through the algae) but more so from sedimentary evaporations that continue to form dolomite long after being buried. Did I read that right?

Yes, that is correct. But also from alteration of Limestone where most is formed, i.e., you have a LS formation near the surface and surface water rich in Mg++ percolates down to the LS and the water evaporates and converts it to Dolomite. If one looks a a big road cut in the right place you will see Dolomite at the top of the formation and under the Dolomite it is still LS and you can actually see the "line" between the two where it is altering.



Guerry, you can get dolomite from your LFS. It was used as a substrate in the 70's and 80's for freshwater aquariums. Estes puts it out. I paid $20 for two 40lb bags.

Yup that is ture and what I used in all of my tanks back then.

I tried the zeomag before getting the Estes and it worked just fine also. Same stuff from what I could tell on a visual.

Not the same as Zeomag. Zeomag is Activated Dolomite and does not require a lower pH to dissolve it like other Dolomites.



in your article they are talking about "buried microbial mats". What is this mat they are talking about? Is it not the Algae talked about in the article I provided? or is it something else?

Microbial is a term for things like bacteria or cyanobacteria but also viruses and micro algae or some parasites. It means microorganisms and Microbiology is the field. They are either a single cell or a small group of cells. The algae in your article are NOT microbial. When there is no means of ID them they just refer to them as microbial organisms. 99 % of the time buried microbial mats are mostly bacteria and usually cyanobacteria but can contain a multitude of other things. That cyano you see on the bottom of your tanks is a microbial mat.

Structures left by modern microbial mats in their host sediments
http://www.indiana.edu/~sepm04/PDF/Gerdes-Chapter2.pdf

A book on it you can look at
Microbial Mats: Modern and Ancient ... - Joseph Seckbach - Google Books
 

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