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Stratigraphy, mineralogy and geochemistry of the Upper Laetolil tuffs including a new tuff 7 site with footprints of Australopithecus afarensis, Laetoli, Tanzania. / Zaitsev, Anatoly N.; McHenry, Lindsay; Savchenok, Anton I.; Strekopytov, Stanislav; Spratt, John; Humphreys-Williams, Emma; Sharygin, Victor V.; Bogomolov, Evgeny S.; Chakhmouradian, Anton R.; Zaitseva, Olga A.; Arzamastsev, Andrei A.; Reguir, Ekaterina P.; Leach, Larissa; Leach, Michael; Mwankunda, Joshua.

в: Journal of African Earth Sciences, Том 158, 103561, 01.10.2019.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

Harvard

Zaitsev, AN, McHenry, L, Savchenok, AI, Strekopytov, S, Spratt, J, Humphreys-Williams, E, Sharygin, VV, Bogomolov, ES, Chakhmouradian, AR, Zaitseva, OA, Arzamastsev, AA, Reguir, EP, Leach, L, Leach, M & Mwankunda, J 2019, 'Stratigraphy, mineralogy and geochemistry of the Upper Laetolil tuffs including a new tuff 7 site with footprints of Australopithecus afarensis, Laetoli, Tanzania', Journal of African Earth Sciences, Том. 158, 103561. https://doi.org/10.1016/j.jafrearsci.2019.103561

APA

Zaitsev, A. N., McHenry, L., Savchenok, A. I., Strekopytov, S., Spratt, J., Humphreys-Williams, E., Sharygin, V. V., Bogomolov, E. S., Chakhmouradian, A. R., Zaitseva, O. A., Arzamastsev, A. A., Reguir, E. P., Leach, L., Leach, M., & Mwankunda, J. (2019). Stratigraphy, mineralogy and geochemistry of the Upper Laetolil tuffs including a new tuff 7 site with footprints of Australopithecus afarensis, Laetoli, Tanzania. Journal of African Earth Sciences, 158, [103561]. https://doi.org/10.1016/j.jafrearsci.2019.103561

Vancouver

Zaitsev AN, McHenry L, Savchenok AI, Strekopytov S, Spratt J, Humphreys-Williams E и пр. Stratigraphy, mineralogy and geochemistry of the Upper Laetolil tuffs including a new tuff 7 site with footprints of Australopithecus afarensis, Laetoli, Tanzania. Journal of African Earth Sciences. 2019 Окт. 1;158. 103561. https://doi.org/10.1016/j.jafrearsci.2019.103561

Author

Zaitsev, Anatoly N. ; McHenry, Lindsay ; Savchenok, Anton I. ; Strekopytov, Stanislav ; Spratt, John ; Humphreys-Williams, Emma ; Sharygin, Victor V. ; Bogomolov, Evgeny S. ; Chakhmouradian, Anton R. ; Zaitseva, Olga A. ; Arzamastsev, Andrei A. ; Reguir, Ekaterina P. ; Leach, Larissa ; Leach, Michael ; Mwankunda, Joshua. / Stratigraphy, mineralogy and geochemistry of the Upper Laetolil tuffs including a new tuff 7 site with footprints of Australopithecus afarensis, Laetoli, Tanzania. в: Journal of African Earth Sciences. 2019 ; Том 158.

BibTeX

@article{55128681128d4c55821be0341941aa3c,
title = "Stratigraphy, mineralogy and geochemistry of the Upper Laetolil tuffs including a new tuff 7 site with footprints of Australopithecus afarensis, Laetoli, Tanzania",
abstract = "The Upper Laetolil marker Tuffs 1 to 8 are mineralogically similar rocks, but heterogeneous in terms of their texture, structure, proportion of primary minerals, volume of cement and degree of low-temperature alteration. Originally they were deposited as crystal and/or vitric ash of evolved melilite-nephelinitic composition and not as melilitite-(natro)carbonatite. Occurrence of carbonate-silicate melt inclusions in primary minerals supports R. Hay's conclusion that the ash could have erupted from a carbonatitic volcanic source. Primary minerals (melilite, clinopyroxene, garnet, perovskite, magnetite) in the tuffs are characterised by wide variations in their compositions and two and even more mineral populations are present within each marker tuff. Thus, any correlation between the tuffs from different localities on the basis of mineral composition is very difficult to impossible. Tuff 7, with footprints of Australopithecus afarensis, is a very heterogeneous unit both vertically and laterally that formed during four major eruption events. Trace-element geochemistry and Sr-Nd isotopic data for Tuffs 6, 7 and 8 suggest that compositionally different volcanic sources were involved in their formation. Initial Sr-87/Sr-86 and Nd-144/Nd-143 ratios also show that the Sadiman volcano should not be considered as a source for these three marker tuffs at Laetoli. Only Essimingor and Mosonik volcanoes produced rocks that are mineralogically and geochemically similar to the Upper Laetolil marker tuffs, though these volcanoes lie about 100 km from Laetoli.",
keywords = "Australopithecus afarensis, Laetoli, Melilite, Nephelinite, Tuff",
author = "Zaitsev, {Anatoly N.} and Lindsay McHenry and Savchenok, {Anton I.} and Stanislav Strekopytov and John Spratt and Emma Humphreys-Williams and Sharygin, {Victor V.} and Bogomolov, {Evgeny S.} and Chakhmouradian, {Anton R.} and Zaitseva, {Olga A.} and Arzamastsev, {Andrei A.} and Reguir, {Ekaterina P.} and Larissa Leach and Michael Leach and Joshua Mwankunda",
year = "2019",
month = oct,
day = "1",
doi = "10.1016/j.jafrearsci.2019.103561",
language = "English",
volume = "158",
journal = "Journal of African Earth Sciences",
issn = "1464-343X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Stratigraphy, mineralogy and geochemistry of the Upper Laetolil tuffs including a new tuff 7 site with footprints of Australopithecus afarensis, Laetoli, Tanzania

AU - Zaitsev, Anatoly N.

AU - McHenry, Lindsay

AU - Savchenok, Anton I.

AU - Strekopytov, Stanislav

AU - Spratt, John

AU - Humphreys-Williams, Emma

AU - Sharygin, Victor V.

AU - Bogomolov, Evgeny S.

AU - Chakhmouradian, Anton R.

AU - Zaitseva, Olga A.

AU - Arzamastsev, Andrei A.

AU - Reguir, Ekaterina P.

AU - Leach, Larissa

AU - Leach, Michael

AU - Mwankunda, Joshua

PY - 2019/10/1

Y1 - 2019/10/1

N2 - The Upper Laetolil marker Tuffs 1 to 8 are mineralogically similar rocks, but heterogeneous in terms of their texture, structure, proportion of primary minerals, volume of cement and degree of low-temperature alteration. Originally they were deposited as crystal and/or vitric ash of evolved melilite-nephelinitic composition and not as melilitite-(natro)carbonatite. Occurrence of carbonate-silicate melt inclusions in primary minerals supports R. Hay's conclusion that the ash could have erupted from a carbonatitic volcanic source. Primary minerals (melilite, clinopyroxene, garnet, perovskite, magnetite) in the tuffs are characterised by wide variations in their compositions and two and even more mineral populations are present within each marker tuff. Thus, any correlation between the tuffs from different localities on the basis of mineral composition is very difficult to impossible. Tuff 7, with footprints of Australopithecus afarensis, is a very heterogeneous unit both vertically and laterally that formed during four major eruption events. Trace-element geochemistry and Sr-Nd isotopic data for Tuffs 6, 7 and 8 suggest that compositionally different volcanic sources were involved in their formation. Initial Sr-87/Sr-86 and Nd-144/Nd-143 ratios also show that the Sadiman volcano should not be considered as a source for these three marker tuffs at Laetoli. Only Essimingor and Mosonik volcanoes produced rocks that are mineralogically and geochemically similar to the Upper Laetolil marker tuffs, though these volcanoes lie about 100 km from Laetoli.

AB - The Upper Laetolil marker Tuffs 1 to 8 are mineralogically similar rocks, but heterogeneous in terms of their texture, structure, proportion of primary minerals, volume of cement and degree of low-temperature alteration. Originally they were deposited as crystal and/or vitric ash of evolved melilite-nephelinitic composition and not as melilitite-(natro)carbonatite. Occurrence of carbonate-silicate melt inclusions in primary minerals supports R. Hay's conclusion that the ash could have erupted from a carbonatitic volcanic source. Primary minerals (melilite, clinopyroxene, garnet, perovskite, magnetite) in the tuffs are characterised by wide variations in their compositions and two and even more mineral populations are present within each marker tuff. Thus, any correlation between the tuffs from different localities on the basis of mineral composition is very difficult to impossible. Tuff 7, with footprints of Australopithecus afarensis, is a very heterogeneous unit both vertically and laterally that formed during four major eruption events. Trace-element geochemistry and Sr-Nd isotopic data for Tuffs 6, 7 and 8 suggest that compositionally different volcanic sources were involved in their formation. Initial Sr-87/Sr-86 and Nd-144/Nd-143 ratios also show that the Sadiman volcano should not be considered as a source for these three marker tuffs at Laetoli. Only Essimingor and Mosonik volcanoes produced rocks that are mineralogically and geochemically similar to the Upper Laetolil marker tuffs, though these volcanoes lie about 100 km from Laetoli.

KW - Australopithecus afarensis

KW - Laetoli

KW - Melilite

KW - Nephelinite

KW - Tuff

UR - http://www.scopus.com/inward/record.url?scp=85069710603&partnerID=8YFLogxK

U2 - 10.1016/j.jafrearsci.2019.103561

DO - 10.1016/j.jafrearsci.2019.103561

M3 - Article

AN - SCOPUS:85069710603

VL - 158

JO - Journal of African Earth Sciences

JF - Journal of African Earth Sciences

SN - 1464-343X

M1 - 103561

ER -

ID: 45797016