Inclination shallowing study of the Early-Neoproterozoic Liantuo Formation in South China and its paleogeographic implications
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摘要:
华南莲沱组最新的年龄结果表明，其时代结束于715Ma，因此，准确确定莲沱组的古纬度对“雪球地球”的研究具有重要意义。通过对莲沱组红层进行等温剩磁各向异性研究，获得其磁倾角校正因子为0.8719，校正后的磁倾角为70.4°，对比热退磁实验测得的莲沱组磁倾角为67.8°，则其磁倾角偏低量为2.6°。通过校正前后的磁倾角分别计算古纬度，获得磁倾角偏低所引起的古纬度变化为3.9°±6°。通过对比华南与澳大利亚-东南极板块的720Ma古地理位置，发现这一时期冰碛岩从中纬度到赤道广泛分布，验证了当时的“雪球地球”环境。
Abstract:New dating data indicate that the Liantuo Formation ended at 715Ma, and hence the constraint of the paleolatitude of the Liantuo Formation will shed a light on the "Snowball Earth" theory. Researchers have obtained reliable paleomagnetic results from the Liantuo Formation, but the inclination shallowing has not been considered by them. In this paper, the authors obtained a corrected parameter by conducting a remnant anisotropy research on Liantuo Formation. The inclination shallowing in Liantuo Formation is 2.6°, which results in a latitude difference of 3.9°±6°. The reconstruction of the South China and Australia block at 720Ma shows the diamictite distribution from middle latitude to tropical region, which proves the "Snowball Earth" theory.
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Keywords:
- Liantuo Formation /
- inclination shallowing /
- Snowball Earth /
- Neoproterozoic
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致谢: 审稿专家对本文进行了认真细致的审阅，并提出了宝贵的修改意见，在此表示衷心的感谢。
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图 1 采样区区域地质简图
（图中蓝色正方形为本次采样点位置）
Figure 1. Tectonic framework of South China, and geological map of the sampling area
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图 2 本次研究获取的采点（下划线标注TLS编号）在地层上的分布
（TL编号为Jing等[29]采点）
Figure 2. Stratigraphic column of the Liantuo Formation and detailed sampling layer positions of three sub-sections at Yichang
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图 3 代表性样品的热退磁Z氏图（所有结果都为地理坐标系下投影）
Figure 3. Orthogonal vector projection of NRM thermal demagnetization for Liantuo Formation in geographical coordinate, at three Gorges profiles
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图 4 45°方向加场后平行于层面方向（IRMx）和垂直于层面方向（IRMz）等温剩磁获得曲线图（a, d），IRMz/IRMx关系图（b, e）和IRMz/IRMx的热退磁结果（c, f）
Figure 4. Plots of IRMx (parallel to bedding) and IRMz (perpendicular to bedding) acquisitions produced by applying magnetic field at 45° to bedding as function of increasing field (a, d), plots of IRMZ/IRMX(b, e), the thermal demagnetization results of IRMZ/IRMX(c, f)
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图 5 代表性样品磁化率随温度变化曲线
Figure 5. Thermomagnetic curves of susceptibility (K-T) of representative specimens
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表 1 宜昌地区剖面莲沱组样品等温热剩磁各向异性及磁倾角偏低值
Table 1 Anisotropy of isothermal remnant magnetization for Liantuo Formation red beds in Yichang area
ID Iobs IRMz/IRMx
(610~1200mT)IF1 ΔI1(=IF1-Iobs) IRMz/IRMx
(600°C以上）IF2 ΔI2(=IF2-Iobs) 15 64.4 0.7796 69.518 5.118 0.8542 67.7425 3.3425 15-2c 71.5 0.8414 74.277 2.777 0.8513 74.1009 2.6009 15-5b 65 0.899 67.256 2.256 0.8757 67.7876 2.7876 17-1 72.1 0.831 74.976 2.876 0.8118 75.3075 3.2075 3-1 73 0.87 75.105 2.105 0.8859 74.8452 1.8452 4-2b 66.3 0.6147 74.899 8.599 0.901 68.4206 2.1206 5-2b 64.2 0.8472 67.728 3.528 0.9117 66.2153 2.0153 5-4b 66 0.7989 70.420 4.420 0.872 68.7818 2.7818 7-1 61.9 0.8579 65.389 3.489 0.8731 65.0054 3.1054 8-3 70 0.8737 72.359 2.359 0.856 72.6951 2.6951 8-4 66.8 0.8701 69.548 2.748 0.8977 68.9555 2.1555 平均值 67.8 0.8258 71.377 3.577 0.8719 70.4146 2.6146 注：ID为样品号，Iobs为热退磁实验所得样品磁倾角，IRMz/IRMx（610~1200mT）为610~1200mT之间垂直层面方向和平行层面方向等温剩磁大小的比值，IRMz/IRMx（600°C以上）为600 °C以上垂直层面方向和平行层面方向等温剩磁大小的比值，IF为校正后磁倾角，ΔI为校正值 
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