Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Heterogeneous distribution of water in the mantle beneath the central Siberian Craton : Implications from the Udachnaya Kimberlite Pipe. / Kolesnichenko, Maria V.; Zedgenizov, Dmitry A.; Litasov, Konstantin D. и др.
в: Gondwana Research, Том 47, 01.07.2017, стр. 249-266.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Heterogeneous distribution of water in the mantle beneath the central Siberian Craton
T2 - Implications from the Udachnaya Kimberlite Pipe
AU - Kolesnichenko, Maria V.
AU - Zedgenizov, Dmitry A.
AU - Litasov, Konstantin D.
AU - Safonova, Inna Yu
AU - Ragozin, Alexey L.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - The paper presents new petrographic, major element and Fourier transform infrared (FTIR) spectroscopy data and PT-estimates of whole-rock samples and minerals of a collection of 19 relatively fresh peridotite xenoliths from the Udachnaya kimberlite pipe, which were recovered from its deeper levels. The xenoliths are non-deformed (granular), medium-deformed and highly deformed (porphyroclastic, mosaic-porphyroclastic, mylonitic) lherzolites, harzburgite and dunite. The lherzolites yielded equilibration temperatures (T) and pressures (P) ranging from 913 to 1324 °C and from 4.6 to 6.3 GPa, respectively. The non-deformed and medium-deformed peridotites match the 35 mW/m2 conductive continental geotherm, whereas the highly deformed varieties match the 45 mW/m2 geotherm. The content of water spans 2 ± 1–95 ± 52 ppm in olivine, 1 ± 0.5–61 ± 9 ppm in orthopyroxene, and 7 ± 2–71 ± 30 ppm in clinopyroxene. The amount of water in garnets is negligible. Based on the modal proportions of mineral phases in the xenoliths, the water contents in peridotites were estimated to vary over a wide range from < 1 to 64 ppm. The amount of water in the mantle xenoliths is well correlated with the deformation degree: highly deformed peridotites show highest water contents (64 ppm) and those medium-deformed and non-deformed contain ca. 1 ppm of H2O. The high water contents in the deformed peridotites could be linked to metasomatism of relatively dry diamondiferous cratonic roots by hydrous and carbonatitic agents (fluids/melts), which may cause hydration and carbonation of peridotite and oxidation and dissolution of diamonds. The heterogeneous distribution of water in the cratonic mantle beneath the Udachnaya pipe is consistent with the models of mantle plume or veined mantle structures proposed based on a trace element study of similar xenolithic suits. Mantle metasomatism beneath the Siberian Craton and its triggered kimberlite magmatism could be induced by mantle enrichment in volatiles (H2O, CO2) supplied by numerous subduction zones which surrounded the Siberian continent in Neoproterozoic-Cambrian time.
AB - The paper presents new petrographic, major element and Fourier transform infrared (FTIR) spectroscopy data and PT-estimates of whole-rock samples and minerals of a collection of 19 relatively fresh peridotite xenoliths from the Udachnaya kimberlite pipe, which were recovered from its deeper levels. The xenoliths are non-deformed (granular), medium-deformed and highly deformed (porphyroclastic, mosaic-porphyroclastic, mylonitic) lherzolites, harzburgite and dunite. The lherzolites yielded equilibration temperatures (T) and pressures (P) ranging from 913 to 1324 °C and from 4.6 to 6.3 GPa, respectively. The non-deformed and medium-deformed peridotites match the 35 mW/m2 conductive continental geotherm, whereas the highly deformed varieties match the 45 mW/m2 geotherm. The content of water spans 2 ± 1–95 ± 52 ppm in olivine, 1 ± 0.5–61 ± 9 ppm in orthopyroxene, and 7 ± 2–71 ± 30 ppm in clinopyroxene. The amount of water in garnets is negligible. Based on the modal proportions of mineral phases in the xenoliths, the water contents in peridotites were estimated to vary over a wide range from < 1 to 64 ppm. The amount of water in the mantle xenoliths is well correlated with the deformation degree: highly deformed peridotites show highest water contents (64 ppm) and those medium-deformed and non-deformed contain ca. 1 ppm of H2O. The high water contents in the deformed peridotites could be linked to metasomatism of relatively dry diamondiferous cratonic roots by hydrous and carbonatitic agents (fluids/melts), which may cause hydration and carbonation of peridotite and oxidation and dissolution of diamonds. The heterogeneous distribution of water in the cratonic mantle beneath the Udachnaya pipe is consistent with the models of mantle plume or veined mantle structures proposed based on a trace element study of similar xenolithic suits. Mantle metasomatism beneath the Siberian Craton and its triggered kimberlite magmatism could be induced by mantle enrichment in volatiles (H2O, CO2) supplied by numerous subduction zones which surrounded the Siberian continent in Neoproterozoic-Cambrian time.
KW - Content of water
KW - Degree of deformation
KW - Metasomatism
KW - Nominally anhydrous minerals
KW - Peridotite xenolith
KW - NOMINALLY ANHYDROUS MINERALS
KW - H2O STORAGE CAPACITY
KW - EAST KIMBERLITE
KW - OXYGEN FUGACITY
KW - HYDROGEN INCORPORATION
KW - PERIDOTITE XENOLITHS
KW - YAKUTIAN KIMBERLITES
KW - CENOZOIC LITHOSPHERIC MANTLE
KW - OCEAN ISLAND BASALTS
KW - NORTH CHINA CRATON
UR - http://www.scopus.com/inward/record.url?scp=85006819135&partnerID=8YFLogxK
U2 - 10.1016/j.gr.2016.09.011
DO - 10.1016/j.gr.2016.09.011
M3 - Article
AN - SCOPUS:85006819135
VL - 47
SP - 249
EP - 266
JO - Gondwana Research
JF - Gondwana Research
SN - 1342-937X
ER -
ID: 9976831