TY - JOUR

T1 - Spectroscopic evidence of the origin of brown and pink diamonds family from Internatsionalnaya kimberlite pipe (Siberian craton)

AU - Yuryeva, Olga P.

AU - Rakhmanova, Mariana I.

AU - Zedgenizov, Dmitry A.

AU - Kalinina, Viktoria V.

PY - 2020/3/7

Y1 - 2020/3/7

N2 - New spectroscopic data were obtained to distinguish the specific features of brown and pink diamonds from Internatsionalnaya kimberlite pipe (Siberian craton). It is shown that pink and brown samples differ markedly in the content and degree of aggregation of nitrogen defects. Pink diamonds generally have higher nitrogen content and a lower aggregation state compared to brown samples, which often show significant variations in nitrogen content and aggregation state between different growth zones. The 491 and 576 nm luminescent centres, which are signs of deformed brown diamonds, are absent or of low intensity in pink diamonds implying that high nitrogen content predominantly in A form in the pink diamonds had stiffened the diamonds against natural plastic deformation. The GR1 centre, formed by a neutrally charged vacancy, was observed only in pink diamonds, which may be due to their formation and storage in the mantle at lower-temperature conditions. Mineral inclusions indicate peridotitic and eclogitic paragenesis for studied brown and pink diamonds, respectively. It is suggested that brown diamonds have been formed in a primitive mantle at higher temperatures and/or stored there much longer.

AB - New spectroscopic data were obtained to distinguish the specific features of brown and pink diamonds from Internatsionalnaya kimberlite pipe (Siberian craton). It is shown that pink and brown samples differ markedly in the content and degree of aggregation of nitrogen defects. Pink diamonds generally have higher nitrogen content and a lower aggregation state compared to brown samples, which often show significant variations in nitrogen content and aggregation state between different growth zones. The 491 and 576 nm luminescent centres, which are signs of deformed brown diamonds, are absent or of low intensity in pink diamonds implying that high nitrogen content predominantly in A form in the pink diamonds had stiffened the diamonds against natural plastic deformation. The GR1 centre, formed by a neutrally charged vacancy, was observed only in pink diamonds, which may be due to their formation and storage in the mantle at lower-temperature conditions. Mineral inclusions indicate peridotitic and eclogitic paragenesis for studied brown and pink diamonds, respectively. It is suggested that brown diamonds have been formed in a primitive mantle at higher temperatures and/or stored there much longer.

KW - Brown

KW - Defects

KW - Deformation

KW - Diamond

KW - Internatsionalnaya pipe

KW - Luminescence

KW - Mantle

KW - Pink

KW - PHOTOLUMINESCENCE

KW - INFRARED-ABSORPTION

KW - OPTICAL-PROPERTIES

KW - CENTERS

KW - NATURAL DIAMONDS

KW - CLOUDY MICROINCLUSIONS

KW - COLOR

KW - NITROGEN

KW - PLASTIC-DEFORMATION

KW - RED LUMINESCENCE SPECTRUM

UR - http://www.scopus.com/inward/record.url?scp=85081409954&partnerID=8YFLogxK

U2 - 10.1007/s00269-020-01088-5

DO - 10.1007/s00269-020-01088-5

M3 - Review article

AN - SCOPUS:85081409954

VL - 47

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

SN - 0342-1791

IS - 4

M1 - 20

ER -