1 - Novruzov Z.A., 2 - Tselmovich V. A.

1 - Institute of Geology and Geophysics of ANAS, 119, H.Javid ave., Az 1143, Baku, Azerbaijan E-mail: znovruz@yahoo.com

2 - Geophysical Observatory «Borok», Institute of Physics of the Earth, RAS, Borok, Yaroslavl oblast, Russia E-mail: tselm@mail.ru

Microroentgen spectral ore mineral analysis of the volcanics produced from the column of Saatli ultradeep well had revealed relatively small (~2-10 mkm) grains of magnetite, and identified inhomogeneities in large grains of titanomagnetite (~10-100 mkm and over). In deeper depth intervals of 3540-5500 m, development of low-temperature metamorphism is almost not reflected on two generations: 1) large grain of titanomagnetite, homogenous or with a decay structure, and 2) small-sized usually well faceted grain of practically stoichiometric magnetite. The fact that there is no hematite (martite) and that the ilmenite is only present in the structures of decay suggests that the ore grains hasn’t been intensively oxidized after their crystallization process. Metamorphism and metasomatism occurred in within the depth intervals of 7000-8126 m, causes the occurrence, development and spread of a “mosaic” structure of grains, and the formation of their “mottled” structure connected with dotty emissions of rutile in a basic mass of the grain of titanomagnetite and not determined by a hidden structure of decay. Detected are the acicular generations of secondary hematite as well as regularly and irregularly faceted grains of pyrite. Presence of secondary hematite and pyrite generations confirms that there has been a metasomatism process developed and that the fluids with different oxidation-reduction potential had penetrated the deeper-seated rocks.

Keywords: titanomagnetite, magnetite, decay, metamorphism and metasomatism, “mosaic” and “mottled” structures