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Secular variation in Permian red beds from Dome de Barrot, SE France

机译:法国东南部圆顶穹顶的二叠纪红层的长期变化

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摘要

The Dome de Barrot red beds (SE France) were deposited during the Permo-Carboniferous Reversed Superchron (PCRS), near the palaeo-equator. The natural remanent magnetisation (NRM) resides in detrital hematite, which is very resistant against thermal demagnetisation. Microprobe analyses reveal the presence of titanium in hematite grains, indicating the volcanic and thus detrital origin. Therefore, the RNM is a detrital remanent magnetisation and NRM variations reflect changes in the geomagnetic field. Tuning of the proxy parameter magnetic susceptibility to periods of the Earth orbit during Permian times provides relative time control. The inferred average sedimentation rate is 11.8 cm 1000 yr~(-1). The variation in NRM directions is similar to present-day secular variation (SV). This suggests that SV was not suppressed during (at least part of) the PCRS.
机译:Dome de Barrot红床(法国东南部)是在古赤道附近的Permo-Carboniferous Reverse Superchron(PCRS)沉积的。天然剩磁(NRM)驻留在碎屑赤铁矿中,该赤铁矿对热退磁具有很高的抵抗力。微量探针分析显示赤铁矿晶粒中存在钛,表明火山成因,因此是碎屑成因。因此,RNM是一种有害的剩余磁化强度,NRM变化反映了地磁场的变化。在二叠纪期间将代理参数磁化率调整到地球轨道的周期可以提供相对的时间控制。推算出的平均沉降速率为11.8 cm 1000 yr〜(-1)。 NRM方向的变化类似于当今的长期变化(SV)。这表明在PCRS期间(至少部分),SV未被抑制。

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