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地处粤西和桂东南的云开地区前寒武系顶部的硅岩沉积建造（“震旦系Ｄ 组”），具有层状、纹理状、块状和假角砾状构造。其中的元素显著地贫ＴｉＯ２ 和Ａｌ２Ｏ３， 大部分微量元素相对于地壳克拉克值亏损， 但Ｂａ、Ｓｂ、Ｈｇ、Ａｇ 和Ｂｉ等少数几种元素例外地富集； 在Ａｌ－ Ｆｅ－ Ｍｎ 三元图中投影落在热水沉积区域； 以ＲＥＥ总量低为特征， 平均稀土元素分布型式落在世界上已知典型热水沉积物的上、下限之间。上述特征说明， 该硅岩建造是典型的热水沉积成因产物。
Located at the top of the Precambrian siliciclastic deposits (“Sinian D Formation”) in the Yunkai area in western Guangdong and southeastern Guangxi, it has layered, textured, massive and pseudo-brecciated structures. Among them, the elements are significantly lean in TiO 2 and Al 2 O 3, and most of the trace elements are depleted relative to the crust in the crust. However, a few rare earth elements such as Ba, Sb, Hg, Ag and Bi are exceptionally enriched. In the Al-Fe- The mid-projection falls in the hot-water sedimentary area; characterized by low total REE, the average REE pattern falls between the upper and lower limits of known typical hot-water deposits in the world. The above characteristics indicate that the silicon rock formation is a typical product of hydrothermal sedimentation.