摩洛哥中部高阿特拉斯地区碱性侵入岩浆作用的岩石年代学及其与侏罗纪盐底液作用的关系

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Youssef Ahechach, Muhammad Ouabid, Françoise Roger, Fleurice Parat, Otmane Raji, Jean-Marie Dautria, Valérie Bosse, Cheikh Elwali Malainine, Hicham El Messbahi, Hamza Skikra, Jean-Louis Bodinier
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引用次数: 0

摘要

在摩洛哥中央高阿特拉斯,Imilchil碱性省的一个显著特征是岩浆侵入物与由底辟作用挖掘出的三叠纪沉积物密切相关。本研究报告了野外、岩石学、地球化学和Sr-Nd同位素数据,以及新的U-Pb锆石年龄,使我们能够限制侵入时间,并讨论它们与底流构造、岩浆和热液作用的关系。我们的研究结果表明,晚侏罗世的年龄范围有限(约163±1-ca。(149±2 Ma))为岩浆活动的爆发时间,证实了底辟活动和岩浆活动之间的历时性,尽管底辟活动结束和岩浆活动爆发之间的间隔时间很短,只有几个小时。与伸展构造相关的深部断裂,在侏罗纪时期适应了中大西洋扩张速度的增加,在岩浆侵入与底辟的密切联系中发挥了关键作用。断裂首先引发早侏罗世活跃的底辟作用,然后引导地幔局部减压熔融形成的obb型部分熔体。在较浅的深度,底辟构造充当了岩浆迁移的通道,可能以蒸发岩为优先通道。岩浆经过分步结晶并与蒸发岩相互作用,形成普遍存在的富钠热液。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Petrochronology of Alkaline Intrusive Magmatism in the Central High-Atlas (Morocco) and Relationships With Jurassic Salt Diapirism

Petrochronology of Alkaline Intrusive Magmatism in the Central High-Atlas (Morocco) and Relationships With Jurassic Salt Diapirism

A striking feature of the Imilchil alkaline province, in the Moroccan Central High Atlas, is the close association of magmatic intrusions with Triassic sediments exhumed by diapirism. This study reports field, petrographic, geochemical and Sr-Nd isotopic data, as well as new U-Pb zircon ages, which allow us to constrain the timing of the intrusions and to discuss their relationship to diapiric structures and the magmatic and hydrothermal processes. Our results indicate a restricted range of Late Jurassic ages (ca. 163 ± 1—ca. 149 ± 2 Ma) for the paroxysm of magmatic activity and confirm the diachronicity between diapirism and magmatism, albeit with a short interval of only a few My between the end of diapirism and the magmatic paroxysm. Deep-seated faults associated with transtensional tectonics, accommodating the increasing spreading rate of the Central Atlantic during the Jurassic, played a key role in the close association of magmatic intrusions with diapirs. The faults first triggered active diapirism in the Early- Jurassic and then guided OIB-type partial melts formed by local decompression melting of the mantle. At shallower depths, the diapiric structures acted as corridors for magma migration, probably using evaporites as preferential pathways. Magmas underwent fractional crystallization and interacted with evaporites to produce pervasive Na-rich hydrothermal fluids.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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