《Table 2.Distribution of heavy mineral assemblages in different sedimentary areas of the southern Ju

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《"New insights into multiple provenances evolution of the Jurassic from heavy minerals characteristics in southern Junggar Basin, NW China"》

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Abundant data of U-Pb detrital zircon ages were collected by others in order to study thoroughly the Jurassic source to sink systems in the southern Junggar Basin[16，26，47，55].The Jurassic detrital zircon ages of the southern Junggar Basin were compared with the age of magmatic rocks and metamorphic rocks in the potential provenances（data source shown in Table 1）.It is found the Jurassic detrital zircon ages of the central part along the southern margin can be interpreted as a mixture of two sources:late Paleozoic intermediate acidicacidic magmatic belt in the North Tianshan（250-320 Ma）and the Cambrian-Devonian magmatic rocks or metamorphic rocks in the Central Tianshan（380-485 Ma）.The unimodal age peak of detrital zircon samples of Badaowan Formation–Xishanyao Formation transfers from 300 Ma to 396 Ma，which indicates that the major provenance changed from the North Tianshan to the Central Tianshan.The ages of Toutunhe Formation and Qigu Formation is dominantly 230-320 Ma again（Fig.10），suggesting that North Tianshan became the dominant provenance again，which is accordant with the vertical change trend of the ZTR index.The detrital zircon age of Badaowan Formation in the east of the southern Junggar Basin presents the unique ages of 485-520 Ma，which is the first appearance of ophiolite age from the Kalamaili Mountains，may from the recycling part of palaeozoic strata.Furthermore，southward paleocurrent direction along the northern margin of Bogda Mountains shown by a lot of data also proves Kalamaili Mountains was a provenance of the southern Junggar Basin.From Xishanyao Formation，the proportion of the number of the samples with zircon age of 485-520 Ma decrease continuously in the east of the southern Junggar Basin，and the age of early Paleozoic intermediate acidic-acidic volcanic rock become predominant，while the samples with zircon age of less than 230 Ma increases gradually，indicating that Bogda Mountains already began to uplift at that time（Fig.10）.