Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics

Most of the diamond deposits in China are in the North China Craton. In addition to gem diamonds in kimberlite, a large number of microdiamonds have also been discovered in alkaline dolerites. These microdiamonds show very different characteristics from those recovered in kimberlite. Here, we report...

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Autores principales:	Yitao Cai, Zhengqi Cao, Fei Liu, Kan Li, Long Li, Jingsui Yang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	microdiamond FTIR carbon isotopic alkalic dolerite North China Craton Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/73c8bdf0e7e74f65946d553c1ae51cb0
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spelling	oai:doaj.org-article:73c8bdf0e7e74f65946d553c1ae51cb02021-11-25T17:18:18ZMicrodiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics10.3390/cryst111113252073-4352https://doaj.org/article/73c8bdf0e7e74f65946d553c1ae51cb02021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1325https://doaj.org/toc/2073-4352Most of the diamond deposits in China are in the North China Craton. In addition to gem diamonds in kimberlite, a large number of microdiamonds have also been discovered in alkaline dolerites. These microdiamonds show very different characteristics from those recovered in kimberlite. Here, we report the morphology, colour, nitrogen contents, and carbon isotopic compositions of the diamonds recovered from the alkalic dolerites in eastern China. The microdiamonds are mainly cube and rhombic dodecahedron with diameters of 0.2 to 0.6 mm. Infrared spectrum analysis shows that these microdiamonds are mostly type Ib with a small amount of type Ia. The Y centre is obvious in type Ib diamond. Modelling mantle residence times for the IaAB diamonds is about 550 Ma. Nitrogen contents of the diamonds range from 4.5–503 ppm, with a median value of 173 ppm. The total δ<sup>13</sup>C range of the microdiamonds varies between −18.6 and −21.1‰ and are similar to those of ophiolite diamond.Yitao CaiZhengqi CaoFei LiuKan LiLong LiJingsui YangMDPI AGarticlemicrodiamondFTIRcarbon isotopicalkalic doleriteNorth China CratonCrystallographyQD901-999ENCrystals, Vol 11, Iss 1325, p 1325 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	microdiamond FTIR carbon isotopic alkalic dolerite North China Craton Crystallography QD901-999
spellingShingle	microdiamond FTIR carbon isotopic alkalic dolerite North China Craton Crystallography QD901-999 Yitao Cai Zhengqi Cao Fei Liu Kan Li Long Li Jingsui Yang Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics
description	Most of the diamond deposits in China are in the North China Craton. In addition to gem diamonds in kimberlite, a large number of microdiamonds have also been discovered in alkaline dolerites. These microdiamonds show very different characteristics from those recovered in kimberlite. Here, we report the morphology, colour, nitrogen contents, and carbon isotopic compositions of the diamonds recovered from the alkalic dolerites in eastern China. The microdiamonds are mainly cube and rhombic dodecahedron with diameters of 0.2 to 0.6 mm. Infrared spectrum analysis shows that these microdiamonds are mostly type Ib with a small amount of type Ia. The Y centre is obvious in type Ib diamond. Modelling mantle residence times for the IaAB diamonds is about 550 Ma. Nitrogen contents of the diamonds range from 4.5–503 ppm, with a median value of 173 ppm. The total δ<sup>13</sup>C range of the microdiamonds varies between −18.6 and −21.1‰ and are similar to those of ophiolite diamond.
format	article
author	Yitao Cai Zhengqi Cao Fei Liu Kan Li Long Li Jingsui Yang
author_facet	Yitao Cai Zhengqi Cao Fei Liu Kan Li Long Li Jingsui Yang
author_sort	Yitao Cai
title	Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics
title_short	Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics
title_full	Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics
title_fullStr	Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics
title_full_unstemmed	Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics
title_sort	microdiamonds in alkalic dolerites from the north china craton: ftir and c isotopic characteristics
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/73c8bdf0e7e74f65946d553c1ae51cb0
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Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic Characteristics

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