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庐山前震旦系由星子群、双桥山群和筲箕洼一汉阳峰组地层构成。通过对庐山前震旦系中锆石U-Pb法定年测定,星子群的斜长角闪岩中锆石的U-Pb法定年结果是1 869±40Ma,由此表明星子群是晚元古代江南造山带的最古老结晶基底;筲箕洼-汉阳峰组中细碧岩和流纹岩的锆石U-Pb法定年结果,分别是917±36Ma和878±51Ma。它们在时代上与邻区登山群、井潭组、松木坞组和上墅组中细碧岩/玄武岩和流纹岩相当,是江南晚元古造山带的重要组成;侵入于星子群和双桥山群的辉绿岩岩墙群中的锆石U-Pb法定年结果是793±156Ma,它是上述造山带的最后岩浆活动的产物。此外,还讨论了“庐山飞来峰”问题。
The former Sinian of Lushan Mountain is composed of Xingzi Group, Shuangqiaoshan Group, and Shau Kei Wa-Hanyangfeng Formation. By U-Pb dating of the former Sinian zircon in the Lushan Mountain, the U-Pb dating of zircons from the amphibolite in the Xingzi Group is 1 869 ± 40 Ma, which shows that the asteroid group is the late Paleozoic Jiangnan The oldest crystalline basement of the orogenic belt, and the zircon U-Pb dating results of moderately fine boulders and rhyolite from Shau-di-wa-Hanyangfeng Formation are 917 ± 36Ma and 878 ± 51Ma, respectively. They are similar in age to the mountaineering group, the Jingtan group, the Songchuwu group and the Shangshang formation in the small boulders / basalts and rhyolite, and they are important components of the Late Proterozoic orogenic belt in the southern part of the Yangtze River. The zircon U-Pb dating of the diabase dikes in Qiaoshan Group is 793 ± 156Ma, which is the product of the last magmatic activity of the orogenic belt. In addition, “Lushan Flying Peak” issue was also discussed.