The Origin of Sandstones from the SongpanGanze Basin, Sichuan, China: evidence from SHRIMP UPb dating of clastic zircons
- Received Date: 1900-01-01
- Rev Recd Date: 1900-01-01
- Publish Date: 2006-06-10
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Key words:
- SongpanGanze /
- clastic sediments /
- UPb dating method on zircons /
- origin
Abstract: The SongpanGanze basin (Central China) covers a huge triangular area of more than 200,000km2and is bounded by the continental blocks of South China, North China and the Tibetan plateau. The six sandstone samples collected from this belt were analyzed grainbygrain〖KG*2〗using SHRIMP UPb method. The detrital zircons yield a wide range of ages, which〖KG*2〗are focused on Proterozoic with minor contribution from late Archean material. The discordance and Pb loss patterns from low U zircons indicate that they might be resulted from the subsequent magmatism events, including the Sibao to the Indosinian periods.The Caledonian appearance of zircons indicates that the origin of these clastic sediments might originate from the Northern Qinling belt, other zircons originated mainly from the north margin of the Yangtze craton and the south Qinling belt.
Citation: | LAN Zhongwu. The Origin of Sandstones from the SongpanGanze Basin, Sichuan, China: evidence from SHRIMP UPb dating of clastic zircons[J]. Acta Sedimentologica Sinica, 2006, 24(3): 321-332. |