globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.12.047
Scopus记录号: 2-s2.0-85044569033
论文题名:
A 10,000 yr record of high-resolution Paleosecular Variation from a flowstone of Rio Martino Cave, Northwestern Alps, Italy
作者: Zanella E.; Tema E.; Lanci L.; Regattieri E.; Isola I.; Hellstrom J.C.; Costa E.; Zanchetta G.; Drysdale R.N.; Magrì F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 485
起始页码: 32
结束页码: 42
语种: 英语
英文关键词: Italy ; Paleosecular variation ; rock magnetism ; speleothem
Scopus关键词: Calcite ; Catchments ; Demagnetization ; Geomagnetism ; Magnetic fields ; Remanence ; Geomagnetic field model ; Geomagnetic field variations ; High-resolution paleomagnetic records ; Italy ; Paleosecular variations ; Remanent magnetization ; Rock magnetism ; speleothem ; Caves ; demagnetization ; geomagnetic field ; geomagnetism ; magnetic intensity ; paleomagnetism ; remanent magnetization ; secular variation ; speleothem ; Alps ; Italy ; Western Alps
英文摘要: Speleothems are potentially excellent archives of the Earth's magnetic field, capable of recording its past variations. Their characteristics, such as the continuity of the record, the possibility to be easily dated, the almost instantaneous remanence acquisition and the high time-resolution make them potentially unique high-quality Paleosecular Variation (PSV) recorders. Nevertheless, speleothems are commonly characterized by low magnetic intensities, which often limits their resolution. Here we present a paleomagnetic study performed on two cores from a flowstone from the Rio Martino Cave (Western Alps, Italy). U/Th dating indicates that the flowstone's deposition covers almost the entire Holocene, spanning the period ca. 0.5–9.0 ka, while an estimation of its mean growth rate is around 1 mm per 15 years. The flowstone is composed of columnar calcite, characterized by a highly magnetic detrital content from meta-ophiolites in the cave's catchment. This favorable geological context results in an intense magnetic signal that permits the preparation and measurement of thin (∼3 mm depth equivalent) samples, each representing around 45 yr. The Characteristic Remanent Magnetization (ChRM), isolated after systematic stepwise Alternating Field demagnetization, is well defined, with Maximum Angular Deviation (MAD) generally lower than 10°. Paleomagnetic directional data allow the reconstruction of the PSV path during the Holocene for the area. Comparison of the new data with archeomagnetic data from Italian archeological and volcanic records and using the predictions of the SHA.DIF.14k and pfm9k.1a global geomagnetic field models shows that the Rio Martino flowstone represents an excellent recorder of the Earth's magnetic field during the last 9,000 years. Our high resolution paleomagnetic record, anchored by a high-quality chronology, provides promising data both for the detection of short term geomagnetic field variations and for complementing existing regional PSV curves for the prehistoric period, for which well-dated data are still scarce. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110035
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Dipartimento di Scienze della Terra, Via Valperga Caluso 35, Torino, 10125, Italy; Dipartimento di Scienze Pure e Applicate, Piazza della Repubblica 13, Urbino, 61029, Italy; Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, Cologne, 50674, Germany; Istituto di Geoscienze e Georisorse IGG-CNR, via Moruzzi 1, Pisa, 56100, Italy; Istituto Nazionale di Geofisica e Vulcanologia INGV, Via della Faggiola 32, Pisa, 56126, Italy; School of Earth Sciences, University of Melbourne, Victoria, 3010, Australia; Dipartimento di Scienze della Terra, Via S. Maria 53, Pisa, 56126, Italy; School of Geography, University of Melbourne, Victoria, 3010, Australia; EDYTEM, UMR CNRS 5204, Université de Savoie-Mont Blanc, Le Bourget du Lac cedex, 73376, France; Gruppo Speleologico Valli Pinerolesi GSVP, Club Alpino Italiano, Pinerolo, Italy

Recommended Citation:
Zanella E.,Tema E.,Lanci L.,et al. A 10,000 yr record of high-resolution Paleosecular Variation from a flowstone of Rio Martino Cave, Northwestern Alps, Italy[J]. Earth and Planetary Science Letters,2018-01-01,485
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