Инд. авторы:	Rudnev S.N., Izokh A.E., Borisenko A.S., Gas'kov I.V.
Заглавие:	Granitoid magmatism and metallogeny of the Lake Zone in Western Mongolia (by the example of the Bumbat-Hairhan area)
Библ. ссылка:	Rudnev S.N., Izokh A.E., Borisenko A.S., Gas'kov I.V. Granitoid magmatism and metallogeny of the Lake Zone in Western Mongolia (by the example of the Bumbat-Hairhan area) // Russian Geology and Geophysics. - 2016. - Vol.57. - Iss. 2. - P.207-224. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2016.02.001; РИНЦ: 26972090; SCOPUS: 2-s2.0-84959365824; WoS: 000371245000001;
Реферат:	eng: We present the results of a study of the geologic structure and age sequence of formation of the Late Neoproterozoic-Early Paleozoic plagiogranitoid and gabbroid associations in the Bumbat-Hairhan intrusive area of the Lake Zone in Western Mongolia. The petrogeochemical characteristics of the plagiogranitoids provide information about the conditions of formation of their parental melts at the island-arc and accretion-collision stages of the regional evolution. They also help to establish the main magma-generating sources as well as the major mechanisms of large-scale formation of granitoid melts and their relationship with ore generation processes. According to the trace-element and REE patterns and indicative ratios of these elements, the plagiogranitoids are subdivided into high-and low-alumina ones. Among the island-arc plagiogranitoids (551-524 Ma) of the Bumbat-Hairhan area, high-alumina varieties are the most widespread. They resulted from the partial melting of metabasites in equilibrium with garnet-containing restite at >= 15 kbar during their subsidence into the subduction zone. In geochemical features these plagiogranitoids are similar to high-Si adakites of different world regions. Island-arc low-alumina plagiogranitoids are scarcer. Their geochemical characteristics indicate that the parental melts were generated through the partial melting of metabasites in the lower part and/or in the basement of the island-arc system in equilibrium with amphibole-containing restite at <= 8 kbar. Plagiogranitoid associations of the accretion-collision stage (511-468 Ma) are the most widespread in the Bumbat-Hairhan area. They are subdivided into high-and low-alumina ones. According to the contents of trace elements and their indicative ratios, the low-alumina plagiogranitoids resulted from the partial melting of metabasites in equilibrium with plagioclase-containing restite at <= 8 kbar in the upper part of the collisional structure, and the high-alumina ones were generated through the melting of metabasites in the basement of thick crust in equilibrium with garnet-containing restite at >= 15 kbar. Geochronological studies in the Bumbat-Hairhan area revealed two stages of ore-generating processes spatially and temporally related to the formation of low-alumina plagiogranitoids. The early stage (518 +/- 5 Ma), development of vein Cu (Au) mineralization, coincided in time with the formation of island-arc low-alumina plagiogranitoids of the Darbi massif (similar to 524 Ma). The late stage (456 +/- 4 Ma), formation of porphyry Cu-Mo (Au) mineralization, was synchronous with the formation of the low-alumina plagiogranites at the accretion-collision stage (similar to 468 Ma). (C) 2016, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
Ключевые слова:	BELT; GROWTH; CALEDONIDES; SIBERIAN CRATON; GEOCHRONOLOGICAL-DATA; CONTINENTAL-CRUST; ND ISOTOPE DATA; PLASMA-MASS SPECTROMETRY; geochemistry; geochronology; Late Neoproterozoic-Early Paleozoic intrusive magmatism; Lake Zone of Western Mongolia; Central Asian Fold Belt; CENTRAL-ASIAN FOLDBELT; MINERALIZATION;
Издано:	2016
Физ. характеристика:	с.207-224
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