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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MDPI AG
2021-10-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/11/1325 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T05:35:28Z |
| format | Article |
| id | doaj.art-73c8bdf0e7e74f65946d553c1ae51cb0 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T05:35:28Z |
| publishDate | 2021-10-01 |
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| series | Crystals |
| spelling | doaj.art-73c8bdf0e7e74f65946d553c1ae51cb02023-11-22T22:57:57ZengMDPI AGCrystals2073-43522021-10-011111132510.3390/cryst11111325Microdiamonds in Alkalic Dolerites from the North China Craton: FTIR and C Isotopic CharacteristicsYitao Cai0Zhengqi Cao1Fei Liu2Kan Li3Long Li4Jingsui Yang5Jinling Institute of Technology, College of Material Engineering, Nanjing 211169, ChinaCollege of Resource Environment and Tourism, Hubei University of Arts and Science, Xiangyang 441053, ChinaInstitute of Geology, China Academy of Geological Sciences, Beijing 100037, ChinaDepartment of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6H 2E3, CanadaDepartment of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6H 2E3, CanadaSchool of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, ChinaMost 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.https://www.mdpi.com/2073-4352/11/11/1325microdiamondFTIRcarbon isotopicalkalic doleriteNorth China Craton |
| spellingShingle | 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 Crystals microdiamond FTIR carbon isotopic alkalic dolerite North China Craton |
| title | 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_short | 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 |
| topic | microdiamond FTIR carbon isotopic alkalic dolerite North China Craton |
| url | https://www.mdpi.com/2073-4352/11/11/1325 |
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