Geologic structure of Lesser Khingan and its position in structure of Far East |
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| Abstract: | The Lesser Khingan has been variously assigned to, 1) a zone of Mesozoic folding at the western margin of the East Asian Mesozoic-Cenozoic folded belt; 2) the Mongol-Okhotsk folded belt. 3) the marginal zone of the northeast side of the Chinese platform as altered by very late folding, hi order to establish its tectonic affinity, the geologic and especially tectonic history is considered from Proterozoic rime to the present. Tectonic maps give details of structures within Proterozoic. Mesozoic, and Cenozoic sadimentary and associated igneous rock complexes. Major anticlinoria and synclinoria are discussed and the role of ancient deep faults is noted. From a consideration of the several stages in the history of the Lesser Khingan it is concluded that its geosynclinal. development within the southern (Paleozoic) branch of the Mongol-Okhotsk belt has been completed by the end of Paleozoic time, This means that the area has no direct affinity with the younger East Asia geosynclinal belt. However, it seems logical that the lesser Khingan should have exerted a dynamic action on the adjacent young platform to the west, as shown by extensive dislocation of Mesozoic strata in its eastern structures.—W.D. Lowry |
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