Topic
Silicate minerals
About: Silicate minerals is a research topic. Over the lifetime, 1794 publications have been published within this topic receiving 67064 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: Barium silicate minerals such as celsian, ganterite, armenite, as well as Ba-bearing and Ba-free white mica from the Berisal Complex, Simplon Nappe, Swiss Alps, were dated by 39 Ar and 40 Ar as discussed by the authors.
24 citations
TL;DR: Mackenzie and Garrels as discussed by the authors suggested that the amorphous aluminium silicate fraction of river sediment with dissolved bicarbonate, silica and cations in ocean water to form authigenic sedimentary silicate minerals.
Abstract: IN the search for a general theory to explain the chemical composition of ocean water, emphasis has been put on inorganic equilibrium models which are themselves based on the postulate of a steady state oceanic system1–3. The major cation content and pH of ocean water at present are very similar to the values predicted by equilibrium calculations, and one of the most important of these reactions is supposed to be that of the amorphous aluminium silicate fraction of river sediment with dissolved bicarbonate, silica and cations in ocean water to form authigenic sedimentary silicate minerals. Mackenzie and Garrels3 suggest that these reactions take place before deposition of the sediments and calculate that only 7 percent of the amount of suspended river sediment entering the ocean would have to form authigenic minerals if the composition of the oceans were to remain constant. Although there is no conclusive field evidence for the proposed mineral–water reactions and their effect on the major cation budgets in the oceanic system, there is field and laboratory evidence to show that boron is taken up by the fine-grained silicate material during the transfer from the fresh water to the marine environments4–10.
24 citations
TL;DR: In vitro experiments involving contact of the silicate with cultured murine Ehrlich cells have identified modifications in the surface chemistry of Al, Mg and Fe in the silicates and changes in cellular iron content.
Abstract: We extend our electron spectroscopy for chemical analysis studies of the chemistry of silicates to provide direct surface chemical information on the interactions involved in silicate-induced lung and tissue pathology. A total of five fibrous and non-fibrous silicate minerals, primarily amphiboles, have been studied: anthophyllite, tremolite, cummingtonite, hornblende and actinolite. We have followed the `inlattice9 surface chemistry of these materials and monitored features such as the simultaneous presence of four- and six-coordinate (with respect to oxygen) structural aluminium, and the presence of iron in the M4 octahedral positions. In vitro experiments involving contact of the silicate with cultured murine Ehrlich cells have identified modifications in the surface chemistry of Al, Mg and Fe in the silicates and changes in cellular iron content.
24 citations
TL;DR: In this article, the TL response of certain natural silicate minerals such as aquamarine (AB), morganite (PB), goshenite (WB), white jadeite (JW), green jadeites (JG), pink tourmaline (PT), and two varieties of jade-like quartz, denoted here by JQ1 and JQ2, were investigated using the thermoluminescence technique to evaluate their potential for use as very-high and high-dose dosimeters.
24 citations
TL;DR: In this article, the authors reported that the rate of weathering of silicate minerals in the field is 1 to 3 orders of magnitude slower than would be predicted by rates of dissolution of the same minerals in laboratory experiments.
Abstract: Several previous studies have reported that the rate of weathering of silicate minerals in the field is 1 to 3 orders of magnitude slower than would be predicted by rates of dissolution of the same minerals in laboratory experiments (Paces, 1983; Velbel, 1985: Schnoor, 1990; Brantley, 1992; Swoboda-,~olberg and Drever, 1993). Proposed reasons for the discrepancy include: differences in reactivity between freshly-crushed and weathered minerals, errors in estimating the exposed surface areas of minerals in the field, and differences in solution composition, particularly degree of undersaturation, between the field and laboratory. We report here some experimental results that constrain some of these mechanisms.
24 citations