山西灵丘云彩岭组的时代归属——SKOLITHOS潜穴化石的研究和意义  

Pipe-Rocks-Skolithos from Lingqiu County of Shanxi Province, China

作　　者：朱士兴[1] 陈辉能[1] 高建平[2] 

机构地区：[1]天津地质矿产研究所,天津市300170 [2]山西省地质调查院晋中分院,山西030600

出　　处：《前寒武纪研究进展》2001年第3期163-174,共12页Progress in Precambrian Research

基　　金：国家自然科学基金 (49772 12 8);国土资源部科技基金 (B10 - 3)

摘　　要：山西灵丘地区产有十分丰富和壮观的管状岩 ,即Skolithos潜穴化石 ,它们可与国外产同类化石的一些典型地区相媲美。化石产于一套以紫红色砂岩为主的碎屑岩系中 ,文中称云彩岭组。云彩岭组位于前寒武系雾迷山组或高于庄组与寒武系毛庄组之间 ,前人将其归于新元古代早期的青白口系。笔者根据其中潜穴化石Skolithoslinearis的对比研究 ,将其归为早寒武世早期 ,具体层位在昌平组 (府君山组 )及其相当层位之下 ,因而是华北地区已知层位最低的寒武纪地层。根据该类化石的指相意义和上下层位相标志的研究 ,云彩岭组为一向上变浅的岩系 ,属三角州相沉积。The Pipe-Rocks or burrows Skolithos studied here are found in Lingqiu County, Shanxzi Province, North China. They are as abundant and magnificent as ones from other famous localities in the world. The burrows Skolithos reported here occur in a set of clastic rocks dominated by the red sandstone, which were compared to the Neoproterozoic Qingbaikou System (1 000 800 Ma) in Yanshan Range previously. In this paper they are built a new formation, the Yuncailing Formation. It is disconformably overlain by the Maozhuang Formation of the Lower Cambrian and overlies the Wumishan or Gaoyuzhuang Formation of the Middle Proterozoic unconformably, with a thickness from some meters to more than 100 meters. The Pipe rocks or burrows are c.5～20 m thicken and occurs in the middle part of the Yunca iling formation. Based on their diagnosis, these burrows are well compared with Skolithos linearis Haldeman that is distributed in the Lower Cambrian. On the basis of studying and comparing results mentioned above, the burrow-bearing sequence of clastic rocks, i.e. Yuncailing Formation, should be assigned to the lower Cambrian and not the Neoproterozoic Qingbaikou System. Because the Yuncailing Formation underlies the Chanping Formation (or Fujunshan Formation) belonging to the early stage of the Early Cambrian in adjacent area, it means that this burrow bearing sequence will be the lowerest Cambrian rocks in the North China Platform possibly. Based on the presence of the Skolithos and other available depositional marks, it seems that the Yuncailing Formation was formed in the palaeoenvironment of delta facies.

关 键 词：Skolithos 管状岩石 山西 彩岭组 灵丘地区 时代归属 潜穴仙石 早寒武纪 

分 类 号：P534.41[天文地球—古生物学与地层学]