Расплавные включения сульфатов в хлоридных сегрегациях кимберлитовой трубки Удачная-Восточная

• Main Authors: Максимович, Я. Е., Смирнов, Сергей Захарович, Горяйнов, Сергей Владимирович, Бульбак, Тарас Александрович, Гришина, Светлана Николаевна
• Format: Other/Unknown Material
• Language: Russian
• Published: 2017
• Subjects: хлориды; расплавные включения; кимберлиты; магматические комплексы; сульфаты; Yakutia
• Online Access: https://openrepository.ru/article?id=289060

In recent decades several papers have discussed the possible magmatic origin of chloride- carbonates segregations from kimberlites of the Udachnaya–East pipe, Yakutia. However they did not provide clear evidence for magmatic origin of chloride segregations. We propose the crustal origin of chloride segregations based on inclusion study in halite. We have documented specific types of inclusions, presenting the dramatic evidence of large scale complex and complete recrystallization with no trace of the original depositional features. We present inclusions in salts as wittiness of catastrophic events in the encountering not sedimentary rocks. CO2-bearing inclusions occur as intergrowth with KCl or KCaCl3 crystals at the centre of segregation, while CH4-H2-bearing inclusions was documented in quenched rims along with alkali sulphate melt inclusions, alcali sulphides and calcite. Alcali sulphate inclusions are a new type, if compared with inclusions in metamorphic halite on the contact with dolerite intrusion and exhibit characteristic structures of crystallization from the melt. Two contrasting models could be proposed for formation of the melt at the rim of segregations – crystallisation of residual liquids and partial melting of chloride xenoliths. Gas evolution of CO2- bearing inclusions with carbonaceous matter to CH4-H2-bearing inclusions in quenched halite is best explained by partial melting.