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首页> 外文会议>SEPM-GSL Joint Research Conference >PALEOMAGNETIC SECULAR VARIATION TIME CONSTRAINTS ON LATE NEOGENE GEOLOGICAL EVENTS IN SLOPE SEDIMENT FROM THE EASTERN TYRRHENIAN SEA
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PALEOMAGNETIC SECULAR VARIATION TIME CONSTRAINTS ON LATE NEOGENE GEOLOGICAL EVENTS IN SLOPE SEDIMENT FROM THE EASTERN TYRRHENIAN SEA

机译：蒂尔鲁安海东部坡沉积物后期新岩石地质事件的古磁性世俗变化时间约束

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Cored slope sediment from the Salerno Gulf in the eastern Tyrrhenian Sea ca. 20 km from the Italian coast preserves small-scale changes of Earth's magnetic field behavior (paleomagnetic secular variation; PSV) between 25,000 years B.P. to the present. The age of the cored sediment is calculated from tephrochronology, 14C dates, and correlation to European PSV curves (Turner and Thompson, 1981, 1982; Thouveny et al., 1990) and relative intensity in sediment cored from the Mediterranean Sea (Tric et al., 1992). The analyzed sediments span for the first time the full Holocene and late Pleistocene PSV record in the eastern Tyrrhenian Sea, and results compare well with PSV records for Lac du Bouchet, France (Thouveny et al., 1990).Sedimentation rates, established by PSV dating, are in good overall agreement with sedimentation rates calculated in a second core recovered about 300 m away that was dated by 14C and used for paleoclimate research (Buccheri et al., 2002). However, there are variations in the precision of the dating that depend on the chronologic method used. Moreover, it was found that in the late Pleistocene and to the Pleistocene–Holocene boundary, the sedimentation rate on the continental slope was controlled by global rapid sea-level pulses and cold climatic phases that induced reduction and / or rapid increments in the sediment deposition rate. However, in the middle Holocene during phases of continuous relative sea-level increase, the sedimentation rate on the slope was less sensitive to climatic control than on the continental shelf, whereas from the late Holocene to the present it seems that on both the continental shelf and slope local factors such as volcanic supply and human deforestation could have caused an increase in the sedimentation rate.
机译：从萨勒诺湾东部第勒尼安海约板楼坡沉积物从意大利海岸蜜饯20公里的地球磁场行为的小规模变化（古地磁长期变化; PSV）25000年之间B.P.到现在。金属芯沉积物的年龄从tephrochronology，14C日期和相关欧洲PSV曲线计算（Turner和汤普森，1981，1982; Thouveny等人，1990）和在沉淀相对强度从地中海（TRIC等芯。，1992）。该分析沉积物跨越首次完整全新世和在东部第勒尼安海晚更新世PSV记录，结果与拉丁美洲和加勒比杜布歇，法国PSV记录比较好（Thouveny等，1990）.Sedimentation率，通过建立PSV约会，是在良好的全面协议，在第二核心计算的沉降率恢复约300米处，是由14C过时，用于古气候研究（的Buccheri等，2002）。但是，也有在依赖于所使用的实足方法约会的精度的偏差。此外，人们发现，在晚更新世和更新世全新世界，大陆坡沉降速率由全球快速海平面脉冲和冷气候阶段诱发在沉积物沉积减少和/或快速的增量控制速度。然而，在过程中的连续的相对海平面上升阶段中间全新世，斜坡上的沉降率是气候控制比在大陆架上较不敏感的，而从全新世后期到现在似乎同时在大陆架和斜率局部因素如火山供应和人类砍伐森林可能造成在沉降率的增加。

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