- Tytuł:
- Kaolinite peaks in early Toarcian profiles from the Polish Basin-an inferred record of global warming
- Autorzy:
- Brański, P.
- Powiązania:
- https://bibliotekanauki.pl/articles/2059043.pdf
- Data publikacji:
- 2010
- Wydawca:
- Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
- Tematy:
-
Lower Toarcian
Ciechocinek Fm.
Polish Basin
kaolinite content
palaeoclimate
global warming - Opis:
- In lower Toarcian clay deposits (Ciechocinek Fm., VIII depositional sequence of the Lower Jurassic) from three boreholes from the Polish Basin, illite-dominated sedimentation representing the lower part of studied interval was interrupted by enhanced kaolinite input. Levels of high kaolinite/illite ratio at the VIIIb/VIIIc parasequence boundary suggest strong continental weathering in a humid-subtropical to tropical climate related to the phase of the early Toarcian global warming recorded at the top of the tenuicostatum Zone and correlated with isotope curves from a number of European sections. Kaolinite enrichment may be locally enhanced by reworking ofpre-Jurassic kaolinitic rocks and differential settling. Diagenetic processes were not sufficient enough to transform the initial kaolinite,but may have altered smectite and mixed-layers into illite and/or chlorite.
- Źródło:
-
Geological Quarterly; 2010, 54, 1; 15-24
1641-7291 - Pojawia się w:
- Geological Quarterly
- Dostawca treści:
- Biblioteka Nauki
Artykuł