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(Geological Science) (of an igneous rock) having a low silica content


(ʌnˈsætʃ əˌreɪ tɪd)

1. not saturated; having the power to dissolve still more of a substance.
2. (of an organic compound) having a double or triple bond and capable of forming new compounds by addition.
un•sat′u•rate (-ər ɪt, -əˌreɪt) n.
un`sat•u•ra′tion, n.
References in periodicals archive ?
Undersaturation of quartz in the fluids results from drastic temperature changes in the range 450 350 [degree]C, and in most cases the K or Na metasomatism is controlled by the subsequent disequilibrium between fluids and host rocks (Cathelineau, 1986).
Dissolution of carbonate rocks occur as a result of undersaturation of pore fluid that lead to dissolution of metastable carbonate grains and cement (aragonite/high- magnesium calcite; FlA1/4gel 2004).
Downing, 2011: Carbon dioxide concentrations in eutrophic lakes: Undersaturation implies atmospheric uptake.
2008) reported that coccolithophores are common in the Black Sea, where surface waters are saturated with carbonate year-round, but absent from the Baltic Sea, which has seasonal carbonate undersaturation.
The approximate steady-state dissolution of the synthetic goethite and Kk samples in this study showed undersaturation with respect to goethite and hematite, with [[DELTA].
It may act as a chelator capable of binding the minerals (calcium) of enamel or dentine, thus increasing the degree of undersaturation and favouring demineralisation.
That undersaturation can build up to dangerous levels and deprive these animals of the basic building blocks they need to maintain their shells.
This "Report to an Academy" consists of reflections on how the restlessly cynical university has become the last self-appointed bastion of the humanities in an epoch of the undersaturation of the age with history.
RS is the ratio of calcite activity product (Ka) to calcite solubility product (Ksp), SI value of less than 1 indicates undersaturation, SI of 1 indicates saturation, and SI of more than 1 indicates supersaturation.
Simultaneously with the decrease in the influx of carbonate products by surface and subsurface waters as a result of considerable lixiviation of till layers, carbonate balance in lake water was disturbed: oversaturation was replaced by undersaturation and the stage of Si[O.
In the Drain, the alunite disequilibrium coefficient indicated undersaturation early in the 1997 wet season followed by supersaturation and then strong supersaturation with [D.