当前位置: X-MOL 学术J. South Am. Earth Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
New paleomagnetic data from the Paraná Magmatic Province: Brief emplacement time and tectonism
Journal of South American Earth Sciences ( IF 1.8 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.jsames.2020.102869
Marcia Ernesto , Luiz Alberto Zaffani , George Caminha-Maciel

Abstract The Parana Magmatic Province (PMP) in southern Brazil is divided into three sub-provinces historically characterized by their Ti content (low-Ti in the southern sub-province, high-Ti in the northern, and mixed in the central sub-province). Ar/Ar and U-Pb ages for the PMP usually places the whole volcanism in a brief interval of ∼135-133 Ma with younger ages to the north. The existing paleomagnetic data tend to show differences among the three areas, so far related to the age migration. The new data from 39 flows and sills from the Northern Parana Magmatic Province incorporated into the pre-existing database allowed the calculation of a new paleomagnetic pole after filtering the over-represented sites. However, the recalculated pole for the central PMP using all available data is distinct from the other poles. The mean magnetic inclination for the rocks of central PMP is ∼5° lower than the inclination for the other areas, which may be caused by an N-S dipping of the central area.

中文翻译:

巴拉那岩浆省的新古地磁数据:短暂的侵位时间和构造作用

摘要 巴西南部的巴拉那岩浆省(PMP)在历史上以含钛量为特征划分为三个次省(南部次省低钛、北部高钛和中部次省混合)。 )。PMP 的 Ar/Ar 和 U-Pb 年龄通常将整个火山活动置于~135-133 Ma 的短暂间隔内,北部的年龄较小。现有的古地磁数据倾向于显示三个地区之间的差异,迄今为止与年龄迁移有关。来自北巴拉那岩浆省的 39 个流和基石的新数据并入预先存在的数据库,允许在过滤过度代表的地点后计算新的古地磁极。然而,使用所有可用数据重新计算的中心 PMP 极点与其他极点不同。
更新日期:2021-03-01
down
wechat
bug