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Four aqueous-vapor fluid inclusions P, Q, R and S are petrographically identical at room temperature, and contain approximately 90 % liquid and 10 % vapor. The freezing temperatures of the fluid inclusions are: P = − 5.3 °C, Q = − 16.6 °C, R =

(A) salinity of “P” is highest but density is lowest 
(B) both salinity and density of “Q” are lowest 
(C) both salinity and density of “R” are highest 
(D) both salinity and density of “S” are lowest 


Asked On2017-07-06 08:56:53 by:Aparna-Dasgupta

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(C) both salinity and density of “R” are highest 

Fluid inclusions are microscopic bubbles of liquid and gas that are trapped within crystals. As minerals often form from a liquid or aqueous medium, tiny blebs of that liquid can become trapped within the crystal structure or in healed fractures within a crystal. These small inclusions range in size from 0.1 to 1 mm and are usually only visible in detail by microscopic study.

These inclusions occur in a wide variety of environments. For example, they are found within cementing minerals of sedimentary rocks, in gangue minerals such as quartz or calcite in hydrothermal circulation deposits, in fossil amber, and in deep ice cores from the Greenland and Antarctic ice caps. The inclusions can provide information about the conditions existing during the formation of the enclosing mineral.

Hydrothermal ore minerals typically form from high temperature aqueous solutions. The trapped fluid in an inclusion preserves a record of the composition, temperature and pressure of the mineralizing environment. An inclusion often contains two or more phases. If a vapor bubble is present in the inclusion along with a liquid phase, simple heating of the inclusion to the point of resorption of the vapor bubble gives a likely temperature of the original fluid. If minute crystals are present in the inclusion, such as halite, sylvite, hematite, or sulfides are present, they provide direct clues as to the composition of the original fluid.

Answerd on:2017-07-11 Answerd By:Amogh

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