TY - JOUR

T1 - Raman discrimination of garnet inclusions in Siberian diamonds

AU - Kalugina, A. D.

AU - Zedgenizov, D. A.

N1 - Publisher Copyright: © 2019 John Wiley & Sons, Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/9/1

Y1 - 2020/9/1

N2 - The composition of garnet inclusions in natural garnets is exceptionally useful for identification of the chemical and physical properties of mantle lithologies in which they occur. The results of Raman study of garnet inclusions in Siberian diamonds are presented. Most of studied garnets belong to either peridotitic (P type, n = 101) or eclogitic (E type, n = 63), and some rare garnets are websteritic (n = 5). Detected spectroscopic features of garnets in diamonds reveal a wide wave number ranges for rotational R[SiO4], bending ν2, and stretching ν1 modes. The peak positions of the Raman bands correlate with content of major components of garnets. Raman shift of stretching ν1 and bending ν2 vibrations reflects Ca–Mg and Al–Cr isomorphism. The found correlations have been applied for rough estimation of the garnet compositions. This method allows to discriminate E-type and P-type garnets marking diamondiferous mantle rocks.

AB - The composition of garnet inclusions in natural garnets is exceptionally useful for identification of the chemical and physical properties of mantle lithologies in which they occur. The results of Raman study of garnet inclusions in Siberian diamonds are presented. Most of studied garnets belong to either peridotitic (P type, n = 101) or eclogitic (E type, n = 63), and some rare garnets are websteritic (n = 5). Detected spectroscopic features of garnets in diamonds reveal a wide wave number ranges for rotational R[SiO4], bending ν2, and stretching ν1 modes. The peak positions of the Raman bands correlate with content of major components of garnets. Raman shift of stretching ν1 and bending ν2 vibrations reflects Ca–Mg and Al–Cr isomorphism. The found correlations have been applied for rough estimation of the garnet compositions. This method allows to discriminate E-type and P-type garnets marking diamondiferous mantle rocks.

KW - diamond

KW - eclogite

KW - garnet

KW - mantle

KW - peridotite

KW - HIGH-PRESSURE

KW - X3Y2Z3O12

KW - PYROPE

KW - SPECTROSCOPY

KW - MICROSPECTROMETRY

KW - GEOBAROMETRY

KW - SYSTEMS

KW - SPECTRA

KW - GEOMETRY

UR - http://www.scopus.com/inward/record.url?scp=85070861781&partnerID=8YFLogxK

U2 - 10.1002/jrs.5713

DO - 10.1002/jrs.5713

M3 - Article

AN - SCOPUS:85070861781

VL - 51

SP - 1438

EP - 1444

JO - Journal of Raman Spectroscopy

JF - Journal of Raman Spectroscopy

SN - 0377-0486

IS - 9

ER -