| 辽东地块的构造分解 |
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| 引用本文： | 王东方.辽东地块的构造分解[J].国土资源,1992(2). |
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| 作者姓名： | 王东方 |
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| 作者单位： | 沈阳地质矿产研究所 110032 |
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| 摘 要： | 辽吉地区早前寒武纪基底过去一直作为胶辽隆起的一部分,后者又是统一的华北地台二级构造单元。“七五”期间的研究表明,它们可能由许多古构造地体组成。在辽吉地区,本溪—浑江大断裂实际上是一个古地体的拼贴构造带,断裂两侧太古宙—早元古宙时期地史发展截然不同。鞍本地区的BIF亦是一个独立的构造地体,它们都是在早元古宙末期拼贴完成的,一系列地质事实可以作证。中生代以来的所谓地台活化作用实质上正是由于原先的地体拼贴构造带成为后来的构造薄弱带,从而导致中生代的构造—岩浆活动。
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| 关 键 词： | 辽东地块 解体 地体划分 |
THE TECTONIC DISINTEGRATION OF LIAODONG BLOCK |
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| Wang Dongfang.THE TECTONIC DISINTEGRATION OF LIAODONG BLOCK[J].Land & Resources,1992(2). |
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| Authors: | Wang Dongfang |
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| Abstract: | Up to now, Early Precambrian block in the eastern Liaoning Peninsula has been regarded as a unified tectonic unit, but according to the author's researching, the conclusion is not true. The Benxi-Hunjiang big fault is not a common inner one going through eastern Liaoning block but a terrane collage fault.In the both sides of the fault the geological evolution and structure elements are of mutation and differences. There are 3.5-2.5Ga greenstone and TTG, which general strike of rock zone is along NW or NE, and the Proterozoic strata overprinted on the greenstone is not the Liaohe Group but Nankou, Jixian and Qinbaikou Group in the north side of the fault, so we called it Qinyuan-Jingyu terranc for this block. However there are 2.8-1.8Ga granitoid and granite-gneisses which usually appear as some arches without greenstone and BIF in the south side of the fault,that is the Liaodong-Langlin terrane (Langlin is situated in North Korea).Specially the Liaohe Group would never be found in the north side of the fault. Early Precambrian formation in Anshan-Benxi area includes 3.84-2.5Ga granites and BIF with general strike along the NNW or SN direction. And the BIF only distributs in a triangle area of Anshan-Benxi district, so it is called the An-Ben terrane. The contact relationship between the An-Ben and the Liaodong terrane are showed by a fault, a structure activing zone. From the Liaohe Group having ended its sedimentation of Gaixian Formation during the 1700-1650Ma(by Rb-Sr datings)and its fold zone and dynamic metamorphosed zones all parallel to the Benxi-Hunjiang fault,the collage structure is infered occurring in the time of 1650Ma. And up to 1000Ma,most pleaces on the northere margin of North China Platform deposited the Late Proterozoic strata, so the terrann collage structure just completed eventually. |
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| Keywords: | Liaodong massif Disintegration Tcrranes division |
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