川西須家河組火山巖夾層時(shí)代及其地質(zhì)意義
[Abstract]:The Upper Triassic Xujiahe formation in the western part of Sichuan Basin is the material basis for inversion of tectonic evolution of Foreland basin. The lack of accurate isotopic stratigraphic age hinders further understanding of basin-mountain evolution. The authors found a set of volcanic (clastic) rock intercalations in the Xujiahe formation in the western part of Sichuan Basin. The crystallization age of magmatic zircon in a tuff sample was obtained by LA-ICP-MS U-Pb isotope quantitative analysis. The weighted average value is (214.7 鹵1. 6) Ma, belonging to the late Triassic Norrie period. The results can provide important reference for the division and correlation of lithostratigraphic units of Xujiahe formation in the western Sichuan basin, and further constrain the evolution of Longmenshan uplift and western Sichuan Foreland basin. The time frame for major events, such as the closure of the Gutertes Ocean, provides new evidence. Based on the results of regional volcanic activities in Sichuan Basin and its periphery, the results show that the middle period of the Norley period (210 ~ (22) Ma B.P.) It is a strong regional volcanic eruption stage in western China, which extends from the Qiangtang terrane to the East Kunlun terrane. The corresponding tectonic event is not a traditional Indosinian movement.
【作者單位】: "油氣藏地質(zhì)及開發(fā)工程"國家重點(diǎn)實(shí)驗(yàn)室(成都理工大學(xué));中國石化西南油氣分公司勘探開發(fā)研究院;
【基金】:國家自然科學(xué)重點(diǎn)基金項(xiàng)目(41230313) 國家自然科學(xué)基金青年基金項(xiàng)目(41102064)
【分類號(hào)】:P588.14
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