Hydrous minerals

Hydrous Minerals Minerals that contain water within their matrices. 

Graham CM (1981) Experimental hydrogen isotope studies. Diffusion of hydrogen in hydrous minerals, and stable isotope exchange in metamorphic rocks. Contrib Mineral Petrol 76 216-228 Hoefs J (2004) Stable isotope geochemistry. S" Edition. Springer, Berlin... 

Landsat imagery was downloaded from the GloVis viewer (http //glovis.usgs.gov/). The data were atmospherically and geometrically corrected. Band ratios were used to map the presence of iron oxides, hydroxides, and hydrous minerals, possibly associated with porphyry-style hydrothermally altered and mineralized rocks. 

Godfrey JD (1962) The deuterium content of hydrous minerals from the East Central Sierra Nevada and Yosemite National Park. Geochim Cosmochim Acta 26 1215-1245 Goericke R, Fry B (1994) Variations of marine plankton 6 C with latitude, temperature and dissolved CO2 in the world ocean. Global Geochem Cycles 8 85-90 Goldhaber MB, Kaplan IR (1974) The sedimentary sulfur cycle. In Goldberg EB (ed) The sea, vol. 4. WUey, New York... 

Ion microprobe analyses of hydrous minerals in Martian meteorites reveal two different sources of hydrogen. One is interpreted as magmatic water, with 5D = 900 permil, and thought to reflect the mantle composition the other is thought to reflect the atmospheric composition, with 5D =4000 permil (Leshin, 2000). The incorporation of atmospheric water into these meteorites suggests some kind of cycling of water between the atmosphere and lithosphere on Mars. 

Lange, M. A., Lambert, E, Ahrens, T. I. (1985) Shock effects on hydrous minerals and implications for carbonaceous meteorites. Geochim. Cosmochim. Acta, 49, 1715-26. 

Thermodynamic analysis of mineral equilibria was first made by us (Mel nik and Siroshtan, 1973) on the basis of the new system of thermodynamic constants of minerals that is consistent with experiments (Mel nik, 1972b), which also includes important hydrous minerals like grunerite and minnesotaite. These data were subsequently amended (Mel nik and Radchuk, 1977b), and supplemented by the thermodynamic constants of greenalite and of some diagenetic iron and magnesium minerals (see Appendix). 

Peridotite fertilization may also result from the fractional solidihcation of exotic (deep-seated) melts inhltrated in wall rocks of translithospheric magma conduits. This process was hrst described in composite mantle xenoliths (Wilshire and Shervais, 1975 Gurney and Harte, 1980 Irving, 1980 Wilshire et al., 1980 Boivin, 1982 Harte, 1983 Harte et al, 1993 Menzies et ah, 1987), where it is referred to as modal metasomatism when new (generally hydrous) minerals are precipitated (Dawson, 1984 Kempton, 1987), or Fe-Ti metasomatism (Menzies et al., 1987) when the attention is focused on chemical enrichment. In contrast with ultramafic xenoliths, the tectonically emplaced and oceanic peridotites contain only sparse rock types attributable to mantle metasomatism by deep-seated melts. Examples of wall-rock, modal, and Fe-Ti metasomatism were nevertheless described in IP orogenic Iherzolites, notably in the Pyrenees (Fabrics et al., 1989 Bodinier et al., 1988, 1990, 2003 McPherson et al., 1996 Woodland et al., 1996). 

Hydrogen isotope data for mantle xenoliths is usually acquired on hydrous minerals such as amphibole and mica. One problem is that early studies did not texturally characterize mica occurrences and so the information is of limited value. Perhaps the best-documented study is that... 

These samples may provide a biased perspective of the Earth s mantle because of the association of the host magmas with certain tectonic environments. For example, xenolith-bearing kimberlites are usually found on cratons, which have been shown to be underlain by mantle with anomalous geophysical, and presumably geochemical, nature (see Chapter 2.05). Another caveat is that at many localities, samples containing hydrous minerals may be uncommon, even if they are disproportionately represented in the literature published on a given site—Dish Hill, California, is a good example of this phenomenon. 

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