| 冀东双山子群及朱杖子群时代归属 |
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| 引用本文： | 赵文浩,李敬东.冀东双山子群及朱杖子群时代归属[J].华北地质矿产杂志,1996,11(1):60-64. |
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| 作者姓名： | 赵文浩 李敬东 |
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| 作者单位： | 河北省地质矿产勘查院，河北省地质矿产局第２地质队 |
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| 摘 要： | 双山子群和朱杖子群为一套变余组构保存较好的低角闪岩相－高绿片岩相变质岩系，分布于河北省青龙县双山子一带，东西宽１４ｋｍ，南北长４０ｋｍ。过去大多数地质学家认为，在晚太古代末期－早元古代初期，双山子地区出现裂谷式下陷带，控制了双山子群和朱杖子群的沉积，东部的安子岭杂岩区和西部的迁西群分布区是古隆起区，笔者认为双山子群和朱杖子群是晚太古代生成的，因为，双山子群和朱杖子群与安子岭杂岩和界岭口闪长岩是侵入接触关系，两岩体的Ｒｂ－Ｓｒ全岩等时年龄分别为２４５２Ｍａ和２４４６Ｍａ。在双山子东南２８ｋｍ的庙沟也出露面积约２ｋｍ２的朱杖子群，在安子岭杂岩和界岭口闪长岩中见有大量两群表壳岩的包体，作为朱杖子群底砾岩的老爷庙砾岩，砾石成分主要是闪长岩、火山岩和粉砂岩，从未见到片麻岩。说明砾石来源于下伏双山子群而不是安子岭片麻岩和迁西群片麻岩，因此，晚太古代末期－早元古代初期，双山子一带不是断陷盆地，安子岭地区不是隆起区，双山子群和朱杖子群是晚太古代沉积的。
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| 关 键 词： | 朱杖子群 安子岭杂岩 双山子群 地层 晚太古代 |
On the Age of Zhuzhangzi Group and Shuangshanzi Group, Eastern Hebei |
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| Authors: | ZHAO Wenhao LI Jingdong |
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| Abstract: | Shuangshanzi Group and Zhuzhangzi Group are a suite of low-grade amphibolite factes,to high-grade green schist factes metamorphic rocks with blastostructure well preserved inthe Shuangshanzi area of Qinglong County, Hebei Province, and cover an area of 40 km longand 14 km wide. It was considered by many geologists that from Late Archean to Ear. ly Proterozoic the Anziling complex terrain in the east and the Qianxi Group gneiss terrain in thewest sre two uplifted areas, while the Shuangshanzi region developed into a rift depression,whieh controlled the deposition of Shuangshanzi Group and Zhuzhangzi Group. The examination in the field showed that the Anziling complex and Jielingkou diotite intruded into the different Formations of Shuangshanti Group and Zhuzhangzi Group, the RbSr whole-rock isochropie ages of the two intrusions are 2452 Ma and 2446 Ma, respectively.At Miaogou village 28 km to the southeast of Shuangshanzi, there are also Zhuzhangzi Groupexposed, and a lot of suprcarustal relicts are found in Anziling complex and Jielingkou diorite. Moreover, the hasal conglomerates of Zhuzhangzi Group are composed of gravels of diorites,volcanics and siltstones but no gneiss.It indicates that gravels came from the under-lyingShuangshanzi Group instead of Anziling complex and Qianxi Group gneiss. The evidences described above interpret that the distribution area of Shuangshanzi Group and ZhuzhangziGroup may be much larger than the present exposure. So the Anziling area was not an old uplift, and the Shuangshanzi depression was not formed Late Archean to Early proterozoic.Therefore, the ages of Shuangshanzi Group and Zhuzhangzi Group should belong to LateArchean. |
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| Keywords: | Zhuzhangzi Group Anziling complex Jielingkou diorite Shuangshangzi Group Eastern Hebei |
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