Maastrichtian-Cenozoic erosional history of the northern Peruvian Amazonian Andes implications for the Eastern Cordillera evolution (Huallaga Basin, northern Peru)

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
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Abstract

Late Cretaceous-Cenozoic Andean mountain building may have experienced various phases of orogenesis in response to variations the dip angle of the subducting slab, distinct magmatic pulses, and shortening rates of the orogen. The timing of the Eastern Cordillera (EC) erosion and the relationship between the Andean orogenesis and the establishing of the transcontinental Amazon River remains unclarified. The erosional history of the Amazon Andes and the timing of these orogenic events may be revealed by the late Cretaceous-Cenozoic sedimentary record of the Amazonian retroarc foreland basin. We investigate the provenance of the Maastrichtian-Cenozoic deposits of the Huallaga Basin based on major and trace elements concentrations, SmNd isotopic composition, and UPb zircon dating. We also refined the Oligocene paleoenvironment and calculated Paleogene sedimentation rates. Our results show that despite the 25 Myr-long sedimentary hiatus, both the Maastrichtian and Eocene units show dominant sourcing from the magmatic arc of the Western Cordillera (WC). Increases in Paleozoic and Famatinian zircon grains and a shift toward more negative ƐNd(0) values, indicate dominant EC sources during the Oligocene to middle Miocene. This change in provenance area is Rupelian in age based on the Maximum Likelihood Age (MLA) of JUA22 (29.70 ± 0.62 Ma), suggesting that the onset of Peruvian EC erosion started at ∼30 Ma. The erosion of the EC was accompanied by an increase in sedimentation rates and the development of a meandering fluvial system. Finally, a substantial decrease in zircon grains derived from the Cretaceous and Cenozoic Andean arcs from late Miocene to Recent sediments suggests no contribution of the WC. In contrast, an increase in Paleozoic magmatic arc zircon grains indicates sources in the EC. We compare our findings to constrain the erosional history of the Amazonian Andes and investigate the relationship between the timing of EC uplift and the onset of the transcontinental Amazon drainage system during the Cenozoic.

秘鲁亚马逊安第斯山脉北部马斯特里赫特-新生代侵蚀史对东科迪勒拉山系演化的影响(秘鲁北部瓦利亚加盆地)
晚白垩世-新生代安第斯造山运动可能经历了不同的造山阶段,以应对俯冲板块倾角的变化、不同的岩浆脉冲以及造山运动的缩短速率。东科迪勒拉山系(EC)的侵蚀时间以及安第斯造山运动与横贯大陆的亚马逊河的形成之间的关系仍未明确。亚马孙安第斯山脉的侵蚀历史以及这些造山运动的时间可通过亚马孙后弧前盆地的晚白垩世-新生代沉积记录来揭示。我们根据主要元素和痕量元素浓度、SmNd同位素组成和UPb锆石测年,研究了瓦利亚加盆地马斯特里赫特-新生代沉积物的来源。我们还完善了渐新世的古环境,并计算了古新世的沉积速率。我们的研究结果表明,尽管存在长达 25 Myr 的沉积间断期,但马斯特里赫特期和始新世单元都显示出主要来源于西科迪勒拉山系(WC)的岩浆弧。古生代和法马提尼亚锆石颗粒的增加以及向更负ƐNd(0)值的转变表明,在渐新世至中新世期间,主要的欧共体来源是古生代和法马提尼亚锆石颗粒。根据JUA22的最大似然年龄(MLA)(29.70 ± 0.62 Ma),产地区域的这一变化在年龄上属于鲁佩尔时代,表明秘鲁的EC侵蚀始于∼30 Ma。伴随着EC侵蚀的是沉积速率的增加和蜿蜒流河系统的发展。最后,从中新世晚期到近期的沉积物中,来自白垩纪和新生代安第斯弧的锆石颗粒大幅减少,这表明WC对沉积物没有贡献。相反,古生代岩浆弧锆石颗粒的增加则表明其来源于欧共体。通过比较我们的研究结果,我们可以确定亚马逊安第斯山脉的侵蚀历史,并研究新生代期间欧共体隆升的时间与亚马逊跨大陆排水系统开始形成的时间之间的关系。
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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