| 辽东半岛南部震旦-寒武系界限剖面古地磁特征 |
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| 引用本文： | 蓝晶.辽东半岛南部震旦-寒武系界限剖面古地磁特征[J].国土资源,1988(2). |
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| 作者姓名： | 蓝晶 |
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| 作者单位： | 辽宁省地质矿产局区域地质调查队 |
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| 摘 要： | 在辽东半岛南部震旦-寒武系界限剖面中采集了32块古地磁岩石标本。古地磁测试结果表明:①辽东半岛南部震旦系兴民村期曾出现一次极性倒转,它发生在650Ma左右,可称之为兴民村反极性期,据此,可与国外上先寒武系对比;②本区震旦-寒武系沉积地层曾经历了中纬度→低纬度→中纬度的古地理纬度区的变化历史;③初步建立了辽东半岛南部震旦-寒武系界限附近地层的视古地磁极迁移轨迹。根据古地磁测试结果,结合本区地层特征,将震旦-寒武系界限定在兴民村组与葛屯组之间,兴民村组的顶为震旦系的上限,葛屯组的底为寒武系的下限。
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| 关 键 词： | 古地磁 兴民村反极性期 震旦系 寒武系 界限 辽东半岛 |
PALEOMAGNETIC FEATURES OF SINIAN-CAMBRIAN BOUNDARY IN SOUTHERN LIAODONG PENINSULA |
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| LanJing.PALEOMAGNETIC FEATURES OF SINIAN-CAMBRIAN BOUNDARY IN SOUTHERN LIAODONG PENINSULA[J].Land & Resources,1988(2). |
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| Authors: | LanJing |
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| Abstract: | 32 paleomagnetic samples were collected nearby the strata of Sinian-Cambrian boundary in southern Liaodong Peninsula. Paleomagnetic measurement showed thot 1)the SinJan System strata of the area had been appeared a magnetic polarity reversal in Xingminchun Period in about 650 Ma, which could be called Xingminchun magnetic polarity reversal Period.In view of the above, it can be compared with the upper Precambrian strata of foreign countries, 2) Paleolatirude of the Sinian-Cambrian sedimentary rocks in this area have been changed from the middle latitude to the low one, and to the middle one again, 3) apparent paleomagnetic polar wander paths have been set up for strata nearby the SinianCambrian boundary in Liaodong Peninsula.According to the above and the strata features, it is suggested the SinianCambrian boundary can be determined between Xingminchun Formation and Getun Formation, Xingmincchun Formation is the upper limitation of Sinian System, and Getun Formation is the lower limitation of Cambrian System. |
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| Keywords: | Paleomagnetism Xingminchun magnetic polarity reversal period Sinian System Cambrian System Boundary Liaodong Peninsula |
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