TY - JOUR
T1 - Clay content of a clayey diatomite, the Early Eocene Fur Formation, Denmark
AU - Pedersen, Gunver Krarup
AU - Pedersen, Stig A. Schack
AU - Steffensen, Jacob
AU - Pedersen, Christian Schack
PY - 2004/12/15
Y1 - 2004/12/15
N2 - The Early Eocene Fur Formation is a clayey diatomite interbedded with layers of volcanic ash. The diatomite is non-calcareous, laminated or structureless, and thin sections show that the proportion of clay-sized particles to diatom frustules varies between laminae. The clay mineral phase has been isolated and its chemical composition has been determined by X-ray fluorescence (XRF). Clay mineralogical analyses based on X-ray diffraction (XRD) show that the dominant phase is smectite. A general formula for the clay mineral phase is: X
0.1K
0.2(Mg
0.3Fe(III)
0.3-0.7Al
1.1-1.4)Si
4O
10(OH)
2. The investigation indicates that the clayey diatomite of the Fur Formation comprises three components: diatom frustules, clay minerals and volcanic dust. The chemical compositions of bulk samples have been determined. The clay mineral content is calculated to be 30-45% (by weight). Volcanic dust constitutes c. 10% of the diatomite, and the rest is diatoms (opal-A). The diatom frustules contain some Al
2O
3 that is either of primary or diagenetic origin.
AB - The Early Eocene Fur Formation is a clayey diatomite interbedded with layers of volcanic ash. The diatomite is non-calcareous, laminated or structureless, and thin sections show that the proportion of clay-sized particles to diatom frustules varies between laminae. The clay mineral phase has been isolated and its chemical composition has been determined by X-ray fluorescence (XRF). Clay mineralogical analyses based on X-ray diffraction (XRD) show that the dominant phase is smectite. A general formula for the clay mineral phase is: X
0.1K
0.2(Mg
0.3Fe(III)
0.3-0.7Al
1.1-1.4)Si
4O
10(OH)
2. The investigation indicates that the clayey diatomite of the Fur Formation comprises three components: diatom frustules, clay minerals and volcanic dust. The chemical compositions of bulk samples have been determined. The clay mineral content is calculated to be 30-45% (by weight). Volcanic dust constitutes c. 10% of the diatomite, and the rest is diatoms (opal-A). The diatom frustules contain some Al
2O
3 that is either of primary or diagenetic origin.
KW - Chemical composition
KW - Clay minerals
KW - Denmark
KW - Diatomite
KW - Early Eocene
KW - Fur Formation
UR - http://www.scopus.com/inward/record.url?scp=25844473479&partnerID=8YFLogxK
U2 - 10.37570/bgsd-2004-51-11
DO - 10.37570/bgsd-2004-51-11
M3 - Article
SN - 0011-6297
VL - 51
SP - 159
EP - 177
JO - Bulletin of the Geological Society of Denmark
JF - Bulletin of the Geological Society of Denmark
IS - 2
ER -