Identification and Genesis of the Mixed-Layer Lizardite–Saponite Phase in a Kimberlite Pipe,South Africa |
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| Authors: | Zinchuk N. N. Kotel'nikov D. D. Gorshkov A. I. |
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| Affiliation: | (1) Yakutian Research and Geological Exploration Enterprise of TsNIGRI, AK ALROSA, Chernyshevskoe sh. 7, Mirnyi, 678170, Yakut Republic, Russia;(2) Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 109017, Russia |
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| Abstract: | In autolithic breccia of a kimberlite pipe in South Africa, the ordered mixed-layer lizardite–saponite phase was first identified in rocks containing a mechanical mixture of lizardite and saponite or only saponite in association with lizardite. The mixed-layer phase consists of 52% lizardite and 48% saponite layers. The trioctahedral type of this phase indicates its formation in a closed system and reducing environment, whereas the high content of expanding layers suggests low PT parameters. |
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