Isotope geochemistry and origin of illite-smectite and kaolinite from the Seilitz and Kemmlitz kaolin deposits, Saxony, Germany
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Isotope geochemistry and origin of illite-smectite and kaolinite from the Seilitz and Kemmlitz kaolin deposits, Saxony, Germany. / Gilg, H. A.; Weber, B.; Kasbohm, J.; Frei, R.
In: Clay Minerals, Vol. 38, No. 1, 01.03.2003, p. 95-112.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Isotope geochemistry and origin of illite-smectite and kaolinite from the Seilitz and Kemmlitz kaolin deposits, Saxony, Germany
AU - Gilg, H. A.
AU - Weber, B.
AU - Kasbohm, J.
AU - Frei, R.
PY - 2003/3/1
Y1 - 2003/3/1
N2 - Residual clays that developed on Permian and Carboniferous glass-rich silicic volcanic rocks (pitchstones, ignimbrites) at the Seilitz and Kemmlitz kaolin deposits. Saxony, Eastern Germany, contain locally abundant lath-shaped illite-rich illite-smectite mixed-layer minerals (I-S). Analyses by XRD and TEM-AES reveal a large illite percentage (>∼90%) and R3 ordering in I-S from Seilitz (>∼90%) and smaller illite percentage (∼70%) and R1 ordering in I-S from Kemmlitz. The clays never suffered a deep burial and there is no geological, petrographic or fluid inclusion evidence for acolian input or hydrothermal origin of I-S at either deposit. The I-S formed exclusively at the expense of volcanic glass and not from K-feldspar. Residual quartz phenocrysts in the clays still preserve primary glassy silicate melt inclusions and lack secondary aqueous fluid inclusion trails. The δD and δ18O values of kaolinite and I-S are suggestive of low formation temperatures (<40°C). Rb-Sr and K-Ar dating of I-S-bearing clay separates yield Lower Cretaceous ages at Seilitz and indicates the presence of excess or inherited 40Ar in illite-rich I-S. In contrast, Triassic to Jurassic Rb-Sr ages are obtained for I-S from the Kemmlitz kaolin deposit.
AB - Residual clays that developed on Permian and Carboniferous glass-rich silicic volcanic rocks (pitchstones, ignimbrites) at the Seilitz and Kemmlitz kaolin deposits. Saxony, Eastern Germany, contain locally abundant lath-shaped illite-rich illite-smectite mixed-layer minerals (I-S). Analyses by XRD and TEM-AES reveal a large illite percentage (>∼90%) and R3 ordering in I-S from Seilitz (>∼90%) and smaller illite percentage (∼70%) and R1 ordering in I-S from Kemmlitz. The clays never suffered a deep burial and there is no geological, petrographic or fluid inclusion evidence for acolian input or hydrothermal origin of I-S at either deposit. The I-S formed exclusively at the expense of volcanic glass and not from K-feldspar. Residual quartz phenocrysts in the clays still preserve primary glassy silicate melt inclusions and lack secondary aqueous fluid inclusion trails. The δD and δ18O values of kaolinite and I-S are suggestive of low formation temperatures (<40°C). Rb-Sr and K-Ar dating of I-S-bearing clay separates yield Lower Cretaceous ages at Seilitz and indicates the presence of excess or inherited 40Ar in illite-rich I-S. In contrast, Triassic to Jurassic Rb-Sr ages are obtained for I-S from the Kemmlitz kaolin deposit.
KW - Hydrogen isotope
KW - Illite-smectite
KW - K-Ar
KW - Kaolin deposits
KW - Kaolinite
KW - Kemmlitz
KW - Mesozoic
KW - Oxygen isotopes
KW - Rb-Sr
KW - Saxony
KW - Seilitz
KW - TEM
UR - http://www.scopus.com/inward/record.url?scp=0037364830&partnerID=8YFLogxK
U2 - 10.1180/0009855033810081
DO - 10.1180/0009855033810081
M3 - Journal article
AN - SCOPUS:0037364830
VL - 38
SP - 95
EP - 112
JO - Clay Minerals
JF - Clay Minerals
SN - 0009-8558
IS - 1
ER -
ID: 224700041