Insights into the crustal and the magmatic feeding structure at the Payunia Volcanic Province highlighted by geophysical methods, in the retroarc of the Southern Central Andes

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Journal of Geodynamics Pub Date : 2024-09-19 DOI:10.1016/j.jog.2024.102059
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Abstract

The Payunia Volcanic Province is a Quaternary volcanic plateau emplaced in the retroarc area in the northern Neuquén Mesozoic Basin, associated with a hydrocarbon system. At deeper levels, this basin is linked to different intrusive systems that developed in the retroarc region at different times, during the Jurassic, Cretaceous, Eocene, Miocene, and even the Quaternary which influenced the hydrocarbon system maturity. We analyzed the Moho structure through this retroarc region, as well as the crustal structure affected by different stages of regional extension. From continuous seismic noise data, we calculated the autocorrelograms to obtain the reflection response below each seismological station. This allowed imaging the surface of primary crustal reflectors and in a few stations the top of an asthenospheric anomaly (SWAP) found by magnetotelluric survey and in concordance with satellite magnetic data. The crustal reflectors were identified in all stations at a mean two-way travel time of about ∼8.5 s and ∼12.5 s using frequency bands of about 1.0–2.4 Hz. Therefore, this is the first geophysical research that estimates the depth of the magmatic system, hosted at the top of the lower crust and the Moho discontinuity. The deepest reflector, only recognized in 4 stations, was observed with a two-way travel time of 17.2 s to 19.6 s. We used a mean one-dimensional Vp model to obtain the corresponding reflector depths which constrain the two-dimensional forward gravity model that fits with the observed regional anomaly for the region. We finally established a relationship between the shallowest sublithospheric electrical conductivity anomalies determined in previous researches and the strong deep reflections observed in some of the seismological stations. This information may help to constrain geochemical and petrological models and re-evaluate the hydrocarbon system maturity of the northern Neuquén basin.
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通过地球物理方法深入了解安第斯山脉中南部弧后地区帕尤尼亚火山省的地壳和岩浆哺育结构
帕尤尼亚火山省是一个第四纪火山高原,位于内乌肯中生代盆地北部的弧后地区,与一个油气系统有关。在更深的层次上,该盆地与弧后地区在不同时期(侏罗纪、白垩纪、始新世、中新世,甚至第四纪)形成的不同侵入系统有关,这些侵入系统影响了油气系统的成熟度。我们分析了贯穿弧后地区的莫霍结构,以及受区域延伸不同阶段影响的地壳结构。根据连续地震噪声数据,我们计算了自相关图,以获得每个地震台站下方的反射响应。这使得我们能够对主要地壳反射体的表面进行成像,并在少数几个台站中对磁电勘测发现的、与卫星磁数据一致的岩石圈异常(SWAP)的顶部进行成像。所有站点的地壳反射体都是在平均双向移动时间约为∼8.5 秒和∼12.5 秒的情况下使用约 1.0-2.4 赫兹的频带确定的。因此,这是首次估算岩浆系统深度的地球物理研究,岩浆系统位于下地壳顶部和莫霍不连续处。最深的反射体仅在 4 个站点被观测到,其双向移动时间为 17.2 秒至 19.6 秒。我们利用平均一维 Vp 模型获得了相应的反射体深度,从而约束了二维前向重力模型,该模型与观测到的该地区区域异常相吻合。我们最终确定了以往研究中确定的岩石圈下最浅电导率异常与一些地震台站观测到的强深层反射之间的关系。这些信息可能有助于制约地球化学和岩石学模型,并重新评估内乌肯盆地北部油气系统的成熟度。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
期刊最新文献
Unveiling crustal deformation patterns along the north Tabriz fault from 2015 to 2022 using multi-temporal InSAR analysis Alternative thermal histories of Earth-like planets: Influence of key parameters Tectonic reevaluation of West Cameroon domain: Insights from high-resolution gravity models and advanced edge detection methods Insights into the crustal and the magmatic feeding structure at the Payunia Volcanic Province highlighted by geophysical methods, in the retroarc of the Southern Central Andes Artificial intelligence for assessing the planets' positions as a precursor to earthquake events
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