Paleomagnetism of the Permian De la Cuesta formation (Narváez Range, NW Argentina): Apparent polar wander path and paleogeography of Gondwana and Pangea

IF 1.7 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Cecilia Mariel Spagnuolo , Augusto Ernesto Rapalini , Ricardo A. Astini , Sabrina Y. Fazzito
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Abstract

Permian times were characterized by distribution of land masses forming a supercontinent called Pangea. Although its existence has been accepted for many decades, there is still debate about its configuration. In order to provide new constraints on the position of Gondwana during late Paleozoic times, a paleomagnetic study was carried out on Carboniferous-Permian red beds exposed in the Famatinian Ranges, western Argentina (27°43′S 67°58′W). Eighty four oriented samples (11 sites) were submitted to standard stepwise demagnetization procedures. Magnetic analysis was complemented by acquisition of isothermal remanent magnetization (IRM), backfield curves and anisotropy of magnetic susceptibility (AMS) on selected specimens. Inclination shallowing due to compaction was evaluated by application of oriented acquisition of IRM and demagnetization experiments. The high-temperature magnetic components of sites are characterized by southward declinations with positive inclinations that yield a positive fold test. A new paleomagnetic pole is calculated and suggests an age of magnetization between 300 and 270 Ma, thatmatches with a Pangea B distribution although a Pangea A2 model can not be ruled out if the magnetization age is restricted to 280-270 Ma.
阿根廷西北部二叠纪De la Cuesta组的古地磁:冈瓦纳和盘古大陆的明显极移路径和古地理
二叠纪时期的特点是陆地块的分布形成了一个被称为泛大陆的超大陆。虽然它的存在已经被接受了几十年,但关于它的结构仍然存在争议。为了对晚古生代Gondwana的位置提供新的约束,对阿根廷西部Famatinian山脉(27°43′s 67°58′w)石炭系—二叠系红层进行了古地磁研究。84个定向样品(11个位点)被提交到标准的逐步退磁程序。通过对选定样品的等温剩余磁化率(IRM)、后场曲线和磁化率各向异性(AMS)的采集来补充磁性分析。利用IRM定向采集和消磁实验对压实引起的倾斜变浅进行了评价。这些地点的高温磁成分的特点是向南偏角有正的倾斜,产生正的折叠试验。计算了一个新的古磁极,表明磁化年龄在300 ~ 270 Ma之间,与泛大陆B的分布相匹配,但如果磁化年龄限制在280 ~ 270 Ma之间,则不能排除泛大陆A2的模式。
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来源期刊
Journal of South American Earth Sciences
Journal of South American Earth Sciences 地学-地球科学综合
CiteScore
3.70
自引率
22.20%
发文量
364
审稿时长
6-12 weeks
期刊介绍: Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.
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