10.6084/m9.figshare.3454502.v1
I. V. Ashchepkov
I. V.
Ashchepkov
N. P. Pokhilenko
N. P.
Pokhilenko
N. V. Vladykin
N. V.
Vladykin
A. Y. Rotman
A. Y.
Rotman
V. P. Afanasiev
V. P.
Afanasiev
A. M. Logvinova
A. M.
Logvinova
S. I. Kostrovitsky
S. I.
Kostrovitsky
L. N. Pokhilenko
L. N.
Pokhilenko
M. A. Karpenko
M. A.
Karpenko
S. S. Kuligin
S. S.
Kuligin
E. V. Malygina
E. V.
Malygina
Y. B. Stegnitsky
Y. B.
Stegnitsky
N. A. Alymova
N. A.
Alymova
O. S. Khmelnikova
O. S.
Khmelnikova
Reconstruction of mantle sections beneath Yakutian kimberlite pipes using monomineral thermobarometry
Geological Society of London
2016
Yakutian kimberlite pipes
Opx
Ol
mantle peridotite associations
Cr
pyroxenite layer
monomineral
section
method
horizon
lithologically
kimberlite pipes
Geology
2016-06-21 12:10:10
Dataset
https://geolsoc.figshare.com/articles/dataset/Reconstruction_of_mantle_sections_beneath_Yakutian_kimberlite_pipes_using_monomineral_thermobarometry/3454502
<p>Four original monomineral methods for mantle peridotite associations are used to reconstruct <em>P</em>–<em>T</em> conditions beneath the kimberlite pipes of Yakutia. The clinopyroxene Jd–Di method gives the closest coincidence with Opx
barometry in accord with all physico-chemical boundaries. Garnet thermometers calibrated using Opx, Gar–Cpx and Ni-garnet
thermometers and two variants of barometers were developed separately for pyroxenites and peridotites. A Cr–Sp thermobarometer
uses the monomineralic version of the Ol–Sp thermometer and a newly calibrated Cr–Sp barometer. A picroilmenite method uses
the Ol–Sp thermometer and a pressure-calibration of the geikielite component. Each mantle column is divided into two (upper
and lower) sections by a pyroxenite layer located near 40 kbar. Below the pyroxenite layer, the lower section comprises 3–4
lithologically distinct horizons, with a thermally perturbed layer at the base. Above the pyroxenite layer are 3–5 lithologically
distinct horizons, which are more fertile than the lower sections. Splitting of the geotherms characterizes most <em>P</em>–<em>T</em> diagrams and is ascribed to multistage melt percolation processes typical for the mantle beneath kimberlite pipes. The largest
pipes are diamond-bearing and have a highly depleted peridotite lens above the asthenospheric layer.
</p>