A complex of characteristics (form, arrangement, and internal structure of rocks; mineral composition, geochemical features, isotopic compositions of oxygen, carbon, sulfur, and strontium) of known occurrences of endogenic carbonate rocks in West Transbaikalia suggest their carbonatite nature and, thus, permit us to claim a new West-Transbaikalian carbonatite province, which is associated with Late Mesozoic intracontinental taphrogenic structures. Carbonatites here have high concentrations of strontium, REE, barium, apatite, and iron and are represented primarily by soevites and, to a lesser extent, beforsites and phoscorites. The subvolcanic and effusive nature of carbonatites from the Khalyutinskoe, Arshan, and Yuzhnoe fields is proved. It is shown that, according to age, occurrence, and geochemical composition, they are related to alkali gabbroids differentiated to alkali syenites.

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First page of A NEW CARBONATITE PROVINCE IN WEST TRANSBAlKALIA
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