Reconstruction of the northeastern margin of the North China Craton: Paleomagnetic records from tectonic thermal events in Huinan of Jilin Province
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摘要:
华北克拉通东北缘处于构造运动活跃地区，古地磁研究可为构造演化和岩浆热事件提供依据。笔者在吉林辉南地区中寒武统32个采点共采集246块样品进行了岩石学、岩石磁学及系统热退磁实验。古地磁实验表明，徐庄组砂质泥岩主要磁性矿物是赤铁矿和磁铁矿，张夏组灰岩主要磁性矿物是颗粒较小的磁铁矿和黄铁矿，且均发生了重磁化，并记录了稳定的中温分量，前者中温分量地理坐标平均方向为D/I = 10.9°/50.8°，α95 = 11.7°，对应的极位置为76°N，264.6°E，A95 = 13°，与早白垩世岩浆活动记录的古地磁极位置一致；后者中温分量地理坐标平均方向为D/I = 29.1°/59.0°，α95 = 6.5°，对应的极位置为68°N，213.7°E，A95 = 8.4°，与第四纪火山岩记录的古地磁极位置一致。综合区域地质背景分析，早白垩世—第四纪，吉林辉南及邻区古地磁记录的2次较为强烈的构造热事件，以及因敦化−密山断裂带左旋走滑运动造成的北向运移形成的古纬度差，一定程度上对华北克拉通东北缘起到双重改造作用。
Abstract:The northeastern margin of North China Craton is located in an active area of tectonic movement. Paleomagnetic study can provide a basis record for tectonic evolution and magmatic thermal events. 246 samples were collected from 32 mining sites of the Middle Cambrian in Huinan area, Jilin Province, for petrology, rock magnetism and systematic thermal demagnetization experiments. Rock magnetic study implies that the main magnetic minerals of the Xuzhuang Formation sandy mudstone are hematite and magnetite. The main magnetic minerals of the Zhangxia Formation limestone are magnetite with smaller particles and a small amount of pyrite. Stepwise thermal demagnetization succeeded in isolating the middle-temperature characteristic directions of the samples. The average direction of the Xuzhuang Formation (D/I = 10.9°/50.8°, α95 = 11.7°, corresponding pole position is 76°N, 264.6°E, A95 = 13°), indicates that magmatic activity in the Early Cretaceous affected it. The average direction of the Zhangxia Formation (D/I = 29.1°/59.0°, α95 = 6.5°, corresponding pole position is 68°N, 213.7°E, A95 = 8.4°) were remagnetized which is related to Quaternary volcanic activity. Based on the analysis of regional geological background, at least two strong tectonic thermal events may have occurred from the Early Cretaceous to Quaternary respectively in Huinan area of Jilin Province, which also moved toward north large distance affected by Dunhua−Minshan sinistral slip fault during that time. These magnetic minerals were all remagnetizd and recorded a stable middle−temperature characteristic direction.
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表 1 典型样品的能谱成分数据
Table 1. Energy spectrum composition data of typical samples
测点位置编号 C O S Ca Ti Fe 合计 推测矿物
名称ZHN8-15-11 1 26.84 51.77 21.39 100 黄铁矿 ZHN8-15-11 3 36.35 41.50 2.61 19.53 100 黄铁矿 XHN15-4-09 1 73.50 1.65 24.85 100 磁铁矿 XHN15-4-09 5 6.62 70.56 2.12 20.70 100 磁铁矿 注：按元素百分比（%）显示所有结果，无数据表明不含该元素 
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表 2 吉林辉南地区徐庄组砂质泥岩、张夏组灰岩古地磁中温分量数据
Table 2. Data of paleomagnetic middle temperature component of Xuzhuang Formation sandy mudstone and Zhangxia Formation limestone in Huinan area, Jilin Province
采点 样品数 古地磁方向 n/N Dg/° Ig/° Kg α95g/° Ds/° Is/° Ks α95s/° XHN2 3/8 36.3 47.3 46.9 14.2 346.3 46.8 46.9 14.2 XHN3 4/8 1.1 42.6 25.9 14.4 179.6 31.5 25.9 14.4 XHN5 3/6 356.4 51.3 126.6 11.0 5.6 48.9 126.6 11.0 XHN6 4/8 2.9 70.3 45.3 13.8 142.0 67.3 45.3 13.8 XHN15 5/8 14.3 38.8 332.7 4.2 35.0 52.7 332.7 4.2 徐庄组 平均 10.9 50.8 43.7 11.7 16.3 62.5 3.4 49.3 ZHN2 6/8 31.5 49.7 74.7 7.8 56.7 60.1 63.1 8.5 ZHN4 6/8 27.9 62.9 78.7 7.6 61.7 61.7 67.7 8.2 ZHN7 5/8 18.6 74.5 187.6 5.6 262.1 57.8 187.6 5.6 ZHN8 9/16 3.0 55.9 33.0 9.1 46.6 65.8 33.0 9.1 ZHN9 9/10 33.3 54.7 37.6 8.5 75.1 63.5 21.4 11.4 ZHN10 6/8 56.5 48.7 45.0 10.1 87.0 38.9 45.8 10.0 ZHN11 3/8 275.7 30.2 278.5 7.4 283.3 59.3 278.5 7.4 ZHN13 4/8 6.8 62.3 72.0 10.9 84.9 61.9 50.2 13.1 ZHN14 4/8 31.4 56.5 123.5 8.3 38.1 47.9 120.6 8.4 ZHN15 5/8 38.4 57.1 71.6 9.1 61.9 67.8 71.6 9.1 张夏组 平均 29.1 59.0 63.7 6.5 63.0 63.3 24.1 10.7 注：n/N为获得稳定剩磁的样品数/测量样品数；Dg、Ds为地层校正前/后的磁偏角；Ig、Is为地层校正前/后的磁倾角；Kg、Ks为地层校正前/后平均方向的精度参数；α95g、α95s为地层校正前/后平均方向95%置信圆锥半顶角
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表 3 吉林辉南地区徐庄组砂质泥岩、张夏组灰岩古地磁低温分量数据
Table 3. Data of paleomagnetic low temperature component of Xuzhuang Formation sandy mudstone and Zhangxia Formation limestone in Huinan area, Jilin Province
采点 样品数 古地磁方向 n/N Dg/° Ig/° Kg α95g/° Ds/° Is/° Ks α95s/° 徐庄组砂质泥岩 XHN1 5/9 356.9 54.3 74.9 8.9 109.3 78.2 74.9 8.9 XHN2 6/8 8.4 62.0 82.9 7.4 318.9 38.7 82.9 7.4 XHN3 7/8 356.8 60.6 121.4 5.5 173.5 14.2 121.4 5.5 XHN4 6/6 12.2 56.4 45.8 10.0 39.3 77.0 45.8 10.0 XHN5 6/6 7.7 65.5 154.9 5.4 21.5 61.4 154.9 5.4 XHN6 6/8 12.8 63.7 56.4 9.0 122.0 68.3 57.6 8.9 XHN7 6/8 17.5 66.3 72.9 7.9 18.5 83.3 72.9 7.9 XHN8 5/8 10.6 67.6 71.6 9.1 126.7 70.5 73.2 9.0 XHN11 6/9 0.4 59.3 134.4 5.8 54.0 53.1 134.4 5.8 XHN12 5/8 351.9 62.4 99.7 7.7 111.6 84.1 99.7 7.7 XHN13 7/10 11.0 63.4 146.7 5.0 111.9 77.2 146.7 5.0 XHN14 4/8 345.3 68.8 147.1 7.6 157.0 76.1 147.1 7.6 XHN15 5/8 14.5 61.4 66.1 8.3 67.4 69.8 66.1 8.3 平均 5.1 62.7 220.0 2.8 76.8 79.0 16.3 10.6 张夏组灰岩 ZHN1 5/8 354.9 54.1 94.7 7.9 348.6 52.5 94.7 7.9 ZHN2 4/8 354.6 63.3 417.7 4.5 308.6 83.9 417.7 4.5 ZHN3 5/8 7.6 61.4 30.8 14.0 48.8 73.1 31.2 13.9 ZHN4 7/8 4.6 57.6 146.7 5.0 47.0 62.2 146.7 5.0 ZHN5 6/8 22.7 59.8 71.1 8.0 42.1 63.7 71.1 8.0 ZHN6 4/8 24.5 57.1 58.6 12.1 38.3 69.4 58.6 12.1 ZHN7 12/12 354.0 63.8 389.9 2.2 282.6 51.0 389.9 2.2 ZHN8 16/16 4.4 67.9 187.5 2.7 76.2 70.9 187.5 2.7 ZHN9 10/10 28.6 66.6 78.1 5.5 106.2 75.9 78.1 5.5 ZHN10 7/8 10.3 66.8 130.6 5.3 50.3 48.1 130.6 5.3 ZHN11 6/8 16.1 72.2 104.0 6.6 110.1 65.4 104.0 6.6 ZHN12 6/10 347.3 63.5 43.3 10.3 147.6 60.8 43.3 10.3 ZHN13 4/8 359.4 58.8 102.9 9.1 61.9 61.8 102.9 9.1 ZHN14 4/8 353.2 67.6 528.3 4.0 12.7 63.0 528.3 4.0 ZHN15 4/8 17.4 57.6 83.7 10.1 31.0 72.4 83.7 10.1 ZHN16 4/8 357.4 58.7 51.7 12.9 346.0 69.4 51.7 12.9 ZHN17 6/8 5.7 71.8 52.8 9.3 108.0 70.2 52.8 9.3 平均 5.9 63.4 125.2 3.2 46.2 74.1 16.7 9.0 注：n/N为获得稳定剩磁的样品数/测量样品数；Dg、Ds为地层校正前/后的磁偏角；Ig、Is为地层校正前/后的磁倾角；Kg、Ks为地层校正前/后平均方向的精度参数；α95g、α95s为地层校正前/后平均方向95%置信圆锥半顶角
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表 4 辉南及相邻地区早白垩世古地磁数据
Table 4. Paleomagnetic data of Early Cretaceous in Huinan and adjacent areas
采样地点 采样位置 平均古地磁方向 古地磁极位置 参考文献 纬度(N)/° 经度(E)/° 偏角/° 倾角/° α95 纬度(N)/° 经度(E)/° A95 吉林辉南 42.5 126.3 10.9 50.8 11.7 76.0 264.6 13.0 本文 内蒙古 42.0 119.2 6.8 56.6 4.7 82.9 249.5 5.7 Zhao et al., 1990 辽宁碱锅 41.6 120.7 5.9 58.8 2.9 84.1 244.9 4.9 朱日祥等，2002 辽宁四合屯 41.6 120.7 6.2 58.2 5.5 86.7 246.8 6.0 朱日祥等，2002 蒙古国 45.4 107.6 182.9 −62.6 14.2 86.9 252.6 21.4 Pruner et al., 1992
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表 5 辉南及邻区第四纪古地磁数据
Table 5. Paleomagnetic data of the Quaternary period in Huinan and adjacent areas
采样地点 采样位置 平均古地磁方向 古地磁极位置 参考文献 纬度(N)/° 经度(E)/° 偏角/° 倾角/° α95 纬度(N)/° 经度(E)/° A95 吉林辉南 42.5 126.4 29.1 59.0 6.5 68.0 213.7 8.4 本文 军舰山G1 42.2 129.3 27.1 62.2 4.0 70.3 205.5 4.0 朱日祥等，1990 军舰山G2 42.2 129.3 38.5 61.4 5.0 61.8 205.8 5.0 军舰山G3 42.2 129.3 28.4 58.9 5.2 68.5 216.9 5.2 瀑布PBM 42.0 128.1 33.0 58.2 4.2 64.9 214.0 4.2 气象站东Q 42.0 128.1 23.8 59.6 5.2 72.0 215.0 5.2
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