Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5113873 | Quaternary International | 2017 | 11 Pages |
Abstract
The lattice parameters of the unit cell of gypsum, measured by X-ray diffraction method, are: a = 5.854-12.57 Ã
; b = 9.654-16.231 Ã
; and c = 5.163-14.024 Ã
; β = 113.54-119.88°; Volume = 601.55-712.65 Ã
3. The substitution of K+, Na+ and Mg2+ for Ca2+ can reduce c-axis, while Sr2+ can reduce a and b axes. a/c, b/c, a/b tend to increase with K+, Na+ and Mg2+ and decrease with Sr2+. The Mg2+, Na+, K+ and Sr2+ contents in gypsum show significant variability, with K/Ca molar ratios varying from 1.03Â ÃÂ 10â4 to 32.08Â ÃÂ 10â4, Mg/Ca molar ratios from 0.0023 to 0.1629, Na/Ca molar ratios from 0.031 to 0.575, and Sr/Ca molar ratios from 5.59Â ÃÂ 10â4 to 19.67Â ÃÂ 10â4. Sr2+, Mg2+, Na+, and K+ concentrations in gypsum mainly depend on growth rate and brine concentration.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geology
Authors
Jiao Li, Minghui Li, Xiaomin Fang, Zhengrong Wang, Weilin Zhang, Yibo Yang,