#OOLITE SEDIMENTARY ROCK PROFESSIONAL#

In nature, the balance between dissolution and precipitation is controlled both by inorganic and organic processes. On the other hand, high temperatures, low pressures, or any process leading to a decrease of dissolved CO 2 favor the precipitation of carbonates from water. Consequently, the dissolution of carbonates is favored by low temperature, high pressure, or high amounts of CO 2 dissolved in water. CO 2 is a gas, so its solubility in water is favored by low temperature (CO 2 molecules move slower and are more easily dissolved in water), high pressure (promoting the dissolution of the gas phase to water), or simply because there is more atmospheric CO 2 (which is why tropical carbonate reefs are struggling due to CO 2 emissions). The dissolution of calcite and dolomite is, hence, controlled by how acidic water is, or, in other words, how much atmospheric CO 2 is dissolved in water: the more carbonic acid, the more aggressive water is to carbonates. Magnesium is another common ion in water, which, like calcium, derives from the alteration of minerals like olivine:Д¬a 2+В + Mg 2+В + 4HCO 3 вЂ“В в‡Њ CaMg(CO 3) 2 + 2H 2CO 3 The precipitation of dolomite from a water solution is controlled by a similar reaction. The precipitation of calcium carbonate from water is, hence, balanced by the reaction: H 2CO 3 dissociates in water as carbonate and bicarbonate ions: Atmospheric CO 2 dissolves in water producing H 2CO 3В (carbonic acid), a weak acid, following the reaction: Calcium derives from the weathering of Ca-bearing minerals in rocks, like plagioclase, and it is present in water as Ca 2+ ions. I know youвЂ™re busy so good luck to you in your chosen field.Calcium carbonate occurs dissolved in seawater and fresh waters. I wanted to see if today I could relate the the mid atlantic ridge with a certain marii on the moon named Mare Frigoris ( sea of cold ) Its shape is similar to the mid atlantic ridge, but at right angles to it. The night before, I was intensly studying and and making computer visualing the Alpine Valley, on the Moon. I was researching for the Tharp ocean map, which brought me to your blog. I watched them hatch, and saw them evolve over millions of years, they became like the fossilized Nummulite, but were still alive, and brightly color with a wonderful lacquer like sheen to them. they didnвЂ™t realized that it contained organisms. In this bizarre dream, women were using Ooid as part of a cosmetic. And if not for your blog would have remained a complete mystery forever. These things only became familiar to me today. The pictures stopped me cold in my tracks. I was searching for something else, when I bumped into your blog.

#OOLITE SEDIMENTARY ROCK PROFESSIONAL#

Unfortunately, IвЂ™m not a professional geologist, but I did dream of these things, although I havenвЂ™t a clue why yet. Thank you for posting both the Ooid and Nummulite articles. Here are oodles of ooid and oolite pictures: That last word sounds somewhat fake, but I found it in the trusty Oxford English Dictionary!ДЇor more scientific information about ooids, here is a good article titled вЂњOoid FormationвЂќ (on a wonderfully-named website called Geology Rocks) that describes ooids far better than I could. Other related oo- words are ooidal, oolithic, oolitic, and oolitiferous.

The word also rolls off the tongue in a squishy way that makes me think of marine ooze, which might be found in the vicinity of ooids.ДЄ sedimentary rock composed of lithified (вЂњmade into rockвЂќ) ooids.ДЄ synonym for ooid, often used to refer to a single grain.ДЄ synonym for oolite is roestone- literally, fish egg stone! The word is oval (O) and round (o) just like ooids themselves. вЂњOoidвЂќ is a great word because it looks and sounds like the geological entity it represents. Some geology words I love just because theyвЂ™re just so much fun. According to the Oxford English dictionary, the name came about because ooids resemble roe (fish eggs). The word ooid is derived from an ancient Greek word meaning egg-shaped. Photo courtesy of Matt Kuchta.ДЄ small (generally less than 2 mm), spherical or ellipsoidal concretion of calcium carbonate (CaCO3) that has generally formed around a вЂњnucleusвЂќ such as a shell fragment or a quartz grain. Ooid sand from the shores of the Great Salt Lake, Utah.

Oolite sedimentary rock