Reply on RC2 DOI Creative Commons
Veleda Astarte Paiva Müller

Published: Dec. 27, 2023

Abstract. An asthenospheric window underneath much of the South American continent increases heat flow in Southern Patagonian Andes, where glacial-interglacial cycles drive building and melting Icefields since latest Miocene. The Last Glacial Maximum (LGM) was reached ~20000 years ago, an acceleration deglaciation rate is recorded Little Ice Age (LIA), ~400 ago. Fast uplift rates up to 41±3 mm/yr are measured by GNSS around Icefield currently ascribed post-LIA lithospheric rebound, but possible longer-term post-LGM rebound poorly constrained. These rates, addition, one order magnitude higher than those on other glaciated orogens (e.g., European Alps), which raises questions about role affecting vertical surface displacement rates. Here, we perform geodynamic thermo-mechanical numerical modelling estimate induced accounting for temperature dependent rheologies different thermal regimes asthenosphere. Our modelled maximum postglacial matches observed ratebudget only when both accounted if a standard continental mantle potential increased 150–200 °C. thus play key controlling presently Andes.

Language: Английский

地球系统科学研究态势 DOI Open Access

永飞 郑,

Zhengtang Guo,

念志 焦

et al.

SCIENTIA SINICA Terrae, Journal Year: 2024, Volume and Issue: 54(10), P. 3065 - 3090

Published: Aug. 7, 2024

地球系统可以划分为固体地球系统、表层地球系统和日地空间系统三大组成部分,且三大部分之间存在相互作用和耦合关系。虽然对这三大系统内部学科领域的研究均取得了长足的进展,但是对它们的整体行为以及个体之间的相互作用仍然认识不足,因此面临不同类型和层次的挑战。固体地球系统由地壳、地幔和地核组成,其中地幔环境极端且复杂,导致直接观测和数据获取困难;现有的观测技术难以深入到地幔内部,同时地球内部的高温、高压和强磁场等极端环境也给观测设备和科学实验带来了巨大挑战。表层地球系统也是一个开放的复杂巨系统,其内部各子系统(包括大气圈、水圈、生物圈、土壤圈、岩石圈)之间存在复杂的相互作用和反馈机制,使得对表层地球系统的整体行为和长期演化的理解变得困难。生物活动对表层地球系统的影响日益显著,固体地球系统与表层系统之间的耦合更加复杂。如何区分和量化地球圈层相互作用和生物活动对表层地球系统的影响是一个重要挑战。日地空间系统涉及从微观到宏观的多个尺度,包括太阳活动、地球磁场、大气层、空间天气等多个物理过程。如何跨越不同尺度并建立多物理过程的耦合模型是日地空间系统研究的重要挑战。太阳活动对地球空间环境的影响显著,但现有的观察与重建方法和预测模型在精度和时效性方面仍存在不足。如何提高太阳活动的预测能力并减少空间天气灾害的影响是日地空间系统研究的重要课题。上述地球三大系统内部及其之间的各种过程和现象往往跨越多个时间和空间尺度,并且表现出强烈的非线性特征,使得对其行为和过程的理解变得复杂,这给理论建模和数值模拟带来了巨大挑战。地球系统科学以全球性、统一性的整体观、系统观和多时空尺度,不仅着眼于地球各圈层之间的相互作用,而且以此来研究地球整体及其圈层之间的性质、行为、过程和机制。因此,对地球三大系统的研究需要多学科之间的深入交叉和融合,以共同揭示地球系统的奥秘。

Citations

1
A holistic perspective on Earth system science DOI
Yong‐Fei Zheng,

Zhengtang Guo,

Nianzhi Jiao

et al.

Science China Earth Sciences, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 5, 2024

Language: Английский

Citations

1
Subsurface microbial community structure shifts along the geological features of the Central American Volcanic Arc DOI Creative Commons
Marco Basili, Timothy J. Rogers, Mayuko Nakagawa

et al.

PLoS ONE, Journal Year: 2024, Volume and Issue: 19(11), P. e0308756 - e0308756

Published: Nov. 13, 2024

Subduction of the Cocos and Nazca oceanic plates beneath Caribbean plate drives upward movement deep fluids enriched in carbon, nitrogen, sulfur, iron along Central American Volcanic Arc (CAVA). These compounds fuel diverse subsurface microbial communities that turn alter distribution, redox state, isotopic composition these compounds. Microbial community structure functions vary according to fluid delivery across arc, but less is known about how differ axis a convergent margin as geological features ( e . g ., extent volcanism subduction geometry) shift. Here, we investigate changes bacterial 16S rRNA gene amplicons geochemical analysis deeply-sourced seeps southern CAVA, where Ridge alters setting. We find shifts margin, with similar settings clustering together independently proximity sample sites. correlates variables such host rock type, maturity hydrothermal slab depth different segments CAVA. This reveals tight coupling between Earth processes activity, controlling margin.

Language: Английский

Citations

1
Understanding the coupled evolution of orogens, sedimentary basins and their fluid-rock interactions DOI Creative Commons
Fadi H. Nader, Liviu Maţenco, John Armitage

et al.

Global and Planetary Change, Journal Year: 2023, Volume and Issue: 230, P. 104272 - 104272

Published: Oct. 6, 2023

Language: Английский

Citations

2
Fast uplift in the Southern Patagonian Andes due to long and short term deglaciation and the asthenospheric window underneath DOI Creative Commons
Veleda Astarte Paiva Müller, Pietro Sternai, Christian Sue

et al.

Published: Aug. 18, 2023

Abstract. An asthenospheric window underneath much of the South American continent increases heat flow in Southern Patagonian Andes, where glacial-interglacial cycles drive building and melting Icefields since latest Miocene. The Last Glacial Maximum (LGM) was reached ~20000 years ago, an acceleration deglaciation rate is recorded Little Ice Age (LIA), ~400 ago. Fast uplift rates up to 41±3 mm/yr are measured by GNSS around Icefield currently ascribed post-LIA lithospheric rebound, but possible longer-term post-LGM rebound poorly constrained. These rates, addition, one order magnitude higher than those on other glaciated orogens (e.g., European Alps), which raises questions about role affecting vertical surface displacement rates. Here, we perform geodynamic thermo-mechanical numerical modelling estimate induced accounting for temperature dependent rheologies different thermal regimes asthenosphere. Our modelled maximum postglacial matches observed ratebudget only when both accounted if a standard continental mantle potential increased 150–200 °C. thus play key controlling presently Andes.

Language: Английский

Citations

1
Surviving from transgression to regression of Lake Pannon: Fan deltas of the Nemčiňany Fm. persisted across the rifting until the post-rift stage of the Danube Basin, western Slovakia DOI Creative Commons
Michal Šujan,

Kishan Aherwar,

Andrej Chyba

et al.

Geologica Carpathica, Journal Year: 2024, Volume and Issue: 74(6)

Published: Feb. 1, 2024

Successions deposited under rifting and post-rift settings of an isolated epicontinental basin often exhibit contrasting characteristics. Facies linked to transgression during are typically locally sourced fan deltas transporting coarse-grained sediment, whereas the setup generally involves a normal regression marked by more extensive catchments, sediment from greater distances, overall decrease in average grain size compared transgressive facies. In this study, we present specific scenario based on sedimentological, stratigraphic, authigenic 10Be/9Be analysis Nemčiňany Formation, Upper Miocene deltaic succession eastern Danube Basin, Slovakia. Deposition Fm. was initiated shortly after ~11.6 Ma fourth phase Pannonian Basin System, triggering Lake Pannon. The depositional system persisted until ~9.6 Ma, likely balancing increased accommodation rate with supply shallow lake area situated basement high. Subsequently, relative prompted progradation shelf-slope scale clinoforms, originating system, toward center Komjatice depression at ~9.4 resulting persistence delta unlike common stratigraphic patterns, associated high yielded paleo-Hron river, which entered study area. These observations underscore need for caution predicting provenance shifts changes geodynamic stages basin.

Language: Английский

Citations

0
Geodynamic and Climatic Forcing on Late‐Cenozoic Exhumation of the Southern Patagonian Andes (Fitz Roy and Torres del Paine massifs) DOI Creative Commons
Veleda Astarte Paiva Müller, Christian Sue, Pierre G. Valla

et al.

Tectonics, Journal Year: 2024, Volume and Issue: 43(7)

Published: July 1, 2024

Abstract High‐relief glacial valleys shape the modern topography of Southern Patagonian Andes, but their formation remains poorly understood. Two Miocene plutonic complexes in Andean retroarc, Fitz Roy (49°S) and Torres del Paine (51°S) massifs, were emplaced between 16.9–16.4 Ma 12.6–12.4 Ma, respectively. Subduction oceanic ridge segments initiated ca. 16 at 54°S, leading to northward opening a slab window with associated mantle upwelling. The onset major glaciations caused drastic topographic changes since 7 Ma. To constrain respective contributions tectonic‐mantle dynamics fluvio‐glacial erosion rock exhumation landscape evolution, we perform inverse thermal modeling new data set zircon apatite (U‐Th)/He from two complemented by 4 He/ 3 He for Paine. Our results show rapid recorded only massif 10 8 which ascribe local upwelling forcing surface uplift intensified around 49°S. Both massifs record pulse interpret as enhanced during beginning glaciations. After period erosional tectonic quiescence Pliocene, increased 3–2 is interpreted result alpine valley carving promoted reinforced glacial‐interglacial cycles. This study highlights that was main driver retroarc might be driving force well.

Language: Английский

Citations

0
Iceland Plume and its Magmatic Manifestations: LIP‐Dornröschen in the North Atlantic DOI
Sierd Cloetingh, Alexander Koptev

Acta Geologica Sinica - English Edition, Journal Year: 2024, Volume and Issue: 98(S1), P. 10 - 10

Published: Nov. 1, 2024

Language: Английский

Citations

0
GOLD MEDAL LECTURE GIVEN AT THE ACADEMIA EUROPAEA BUILDING BRIDGES CONFERENCE 2022 DOI Creative Commons
Sierd Cloetingh

European Review, Journal Year: 2023, Volume and Issue: 31(4), P. 328 - 355

Published: Aug. 1, 2023

The quantitative understanding of processes operating in the earth system has advanced significantly over last few decades. This led to realization that a close interaction between deep and surface is key element dynamics its impact on geo-environment, geo-energy, geo-resources geo-hazards general. European continent ocean-continent margins provide an excellent natural laboratory examine geodynamics climate topography at earth’s surface. overview presented here demonstrates need for further across space timescales. Cross-border scientific cooperation full pan-European scale, benefiting from funding opportunities offered by Commission pro-active role bottom-up self-organization involving members Earth Cosmic Sciences section Academia Europaea, needed more than ever.

Language: Английский

Citations

0
Comment on egusphere-2023-1711 DOI Creative Commons
Federico Davila

Published: Sept. 11, 2023

Abstract. An asthenospheric window underneath much of the South American continent increases heat flow in Southern Patagonian Andes, where glacial-interglacial cycles drive building and melting Icefields since latest Miocene. The Last Glacial Maximum (LGM) was reached ~20000 years ago, an acceleration deglaciation rate is recorded Little Ice Age (LIA), ~400 ago. Fast uplift rates up to 41±3 mm/yr are measured by GNSS around Icefield currently ascribed post-LIA lithospheric rebound, but possible longer-term post-LGM rebound poorly constrained. These rates, addition, one order magnitude higher than those on other glaciated orogens (e.g., European Alps), which raises questions about role affecting vertical surface displacement rates. Here, we perform geodynamic thermo-mechanical numerical modelling estimate induced accounting for temperature dependent rheologies different thermal regimes asthenosphere. Our modelled maximum postglacial matches observed ratebudget only when both accounted if a standard continental mantle potential increased 150–200 °C. thus play key controlling presently Andes.

Language: Английский

Citations

0