河北涿鹿地区洪水庄组底砾岩及其地质意义

The Geologycal Significance of the Base-Congnomarate Discovery in Hongshuizhuang Formation, Zhuolu, Hebei Province

广布於燕山地区中元古界的洪水庄组,除在燕山东段有缺失或与下伏雾迷山组呈平行不整合接触的报道以外,其它地区皆与下伏地层呈整合接触。作者於燕山西段河北涿鹿县井沟地区洪水庄组底部首次发现底砾岩及下伏雾迷山组顶部具风化壳,并据此确定该区洪水庄组与下伏雾迷山组顶部平行不整合接触。结合燕山东段洪水庄组或缺失、或与雾迷山组呈平行不整合接触的资料,本文提出燕山地区的南部雾迷山组沉积以后地壳的抬升具有区域性意义,建议将此次地壳上升定名为涿鹿抬升(或运动)。这个区域性的不整合面为中元古界蓟县系的进一步划分提供了确凿依据。

the Hongshuizhuang Formation of Middle-proterozoic Erathem distributed Widely in Yan Mountain area, except those reports about the absentee of this Formation or the unconformity with the Iying Wumishan Formation in cast Yan Mountain, the published documents indicats that they are all conformity with the Iying strats in other areas. The authors finds firstly the base-conglomarate in the basi. of the Hongshuizhang Formation and the weathering crust on the top of the lying wumishan formation, and on the bases of these above they determine that there is a unconformity between the Hongshuizhuang Formation and the wumishan Formation. And combine the data above with followed such as the Honshuizhang Formation is absent or is unconformity with the Wumishan Formation in the west Yan Mountain, this paper advances that the rise of the crust after deposited Wumishan Formation may be regional in the south Yan Mountain, and suggest that this rise names Zhuolu Rise. And this regional unconformity offers also the conclusive evidence for the further division of the Jixian System of the Middle Proterozoic Erathem.