Sokhatiny differentiated gabbro-monzodiorite intrusion from the example of sin-batholitic gabbroids of Yano-Kolymskaya system |
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Authors: | A. E. Izokh N. A. Goryachev A. V. Al’shevskii V. V. Akinin |
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Affiliation: | 1. V.S. Sobolev Institute for Geology and Mineralogy, SB RAS, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia 2. Northeastern Integrated Research Institute, FEB RAS, Portovaya ul. 16, Magadan, 685000, Russia
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Abstract: | The Sokhatnyi intrusion is an example of a later Mesozoic deferential massif referred to the gabbro-monzodiorite type in Northeastern Russia; according to geological data, it precedes high-alumina granitoids of the Yano-Kolymskaya folded system. It is shown that formation of the layered series of the massif is caused by the crystallized and gravitational fractioning of the high-alumina olivine basalt with increased potassium alkalinity in shallow water media. The boundary facies of the massif are represented by manzogabbroidnorites and monzodiorites. The U-Pb age determinations of zircon (SHRIMP-II) from the taxitite striped biothite gabbro in the lower boundary facies showed 148 ± 1 million years. Thus, taking into account the geological relations and geochronological data on the Sokhatinyi gabbro-monzodiorite, a differential intrusion was formed within the same age period as granite batholites of the Main belt. |
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