Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia. / Vasileva, Kseniia Y.; Rogov, Mikhail A.; Ershova, Victoria B.; Pokrovsky, Boris G.
в: GFF, Том 141, № 4, 02.10.2019, стр. 225-232.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia
AU - Vasileva, Kseniia Y.
AU - Rogov, Mikhail A.
AU - Ershova, Victoria B.
AU - Pokrovsky, Boris G.
PY - 2019/10/2
Y1 - 2019/10/2
N2 - We present the results of an optical microscopy, cathodoluminoscopy and isotopic study on nine glendonite concretions (calcite pseudomorphs replacing metastable hexahydrate ikaite) from Lower-Middle Jurassic sediments of Northeast Russia (Anabar Bay and Lena River region). Glendonite concretions are mainly found within Late Pliensbachian, Toarcian, Aalenian, Bajocian and Lower Bathonian clastic sediments, correlating to episodes of global climatic cooling as determined by independent paleoclimate proxy data. Stable carbon and oxygen isotopic values of glendonite concretions suggest that the primary source of carbon was derived from diagenetically altered organic matter, and the source of oxygen was from seawater. The secondary diagenetic cement is characterized by a significantly lighter δ18O and significantly heavier δ13C signature than the isotopic characteristics of the bulk rock glendonite concretion. This secondary diagenetic cement is thought to have precipitated rapidly during burial diagenesis and since it occupies a significant volume of the glendonite concretion, it has the potential to significantly influence the isotopic composition of bulk rock glendonites.
AB - We present the results of an optical microscopy, cathodoluminoscopy and isotopic study on nine glendonite concretions (calcite pseudomorphs replacing metastable hexahydrate ikaite) from Lower-Middle Jurassic sediments of Northeast Russia (Anabar Bay and Lena River region). Glendonite concretions are mainly found within Late Pliensbachian, Toarcian, Aalenian, Bajocian and Lower Bathonian clastic sediments, correlating to episodes of global climatic cooling as determined by independent paleoclimate proxy data. Stable carbon and oxygen isotopic values of glendonite concretions suggest that the primary source of carbon was derived from diagenetically altered organic matter, and the source of oxygen was from seawater. The secondary diagenetic cement is characterized by a significantly lighter δ18O and significantly heavier δ13C signature than the isotopic characteristics of the bulk rock glendonite concretion. This secondary diagenetic cement is thought to have precipitated rapidly during burial diagenesis and since it occupies a significant volume of the glendonite concretion, it has the potential to significantly influence the isotopic composition of bulk rock glendonites.
KW - diagenesis
KW - Glendonites
KW - paleoclimate
KW - stable isotopes
KW - RADIAXIAL-FIBROUS CALCITES
KW - CARBON
KW - RECORD
KW - IKAITE
KW - SEEP
KW - SEA
KW - CLIMATE
UR - http://www.scopus.com/inward/record.url?scp=85073988129&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/new-results-stable-isotope-petrographic-studies-jurassic-glendonites-siberia
U2 - 10.1080/11035897.2019.1641549
DO - 10.1080/11035897.2019.1641549
M3 - Article
AN - SCOPUS:85073988129
VL - 141
SP - 225
EP - 232
JO - GFF
JF - GFF
SN - 1103-5897
IS - 4
ER -
ID: 48488605