Geochemistry and provenances of the Jurassic terrigenous rocks of the Upper Amur and Zeya–Dep troughs, eastern Central Asian fold belt

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• 作者：Yu. N. Smirnova ; A. A. Sorokin ; L. I. Popeko ; A. B. Kotov…
• 关键词：Central Asian fold belt ; Mongol–Okhotsk belt ; Argun terrane ; terrigenous sediments detrital zircons ; Sm–Nd ; LA–ICP–MS
• 刊名：Geochemistry International
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：55
• 期：2
• 页码：163-183
• 全文大小：
• 刊物主题：Geochemistry;
• 出版者：Pleiades Publishing
• ISSN：1556-1968
• 卷排序：55

文摘

This paper reports the results of complex geochemical and Sm–Nd isotope-geochemical studies of terrigenous rocks of the Upper Amur and Zeya–Dep troughs, as well as U–Pb geochronological studies of detrital zircons. It is established that the studied troughs have orogenic nature, which is of key significance for understanding the geodynamic evolution of East Asia in the Mesozoic. Such interpretation is consistent with structural features of the troughs (migration of basin axis inward the continent with time, stratigraphic rejuvenation in the same direction), which are typical of foreland basins regarded as analogues of foreland (marginal) troughs. Obtained data indicate that orogenic processes responsible for the formation of the Mongol-Okhotsk fold belt began in the Early Jurassic.