AGU Eos Editors’ Highlight about CMS Group paper in JGR-ES!美国地球物理联合会会刊Eos以“编辑亮点”形式报道CMS课题组JGR-ES论文!

Eos is a source for news and perspectives about Earth and space science and run by AGU (American Geophysical Union). Eos Editors’ Highlights are part of a collection of some of the most interesting and impactful research published in AGU journals. Recently, our JGR-Earth Surface paper “Denudation rate changes along a fast‐eroding mountainous river with slate headwaters in Taiwan from 10Be (meteoric)/9Be ratios” was selected for Editors’ Highlights. This study was conducted via collaboration between Tongji University and Prof. Friedhelm von Blanckenburg and Dr. Hella Wittmann at German Research Centre for Geosciences (GFZ).

The novel 10Be (meteoric)/9Be system, where 10Be is delivered by precipitation and stable 9Be is released by weathering, provides denudation rates over weathering-erosion timescales. The new tool is applicable to quartz-poor lithologies, e.g. mafic rock and claystone, which are not readily accessible by the commonly used in situ-produced 10Be in quartz. We provide a first application of this proxy to a tectonically-active mountainous river, the Zhuoshui River in Taiwan. Taiwan Rivers supply a disproportionately high suspended and dissolved flux to the oceans and are often underlain by fine-grained shale/slate. 10Be (meteoric)/9Be-derived denudation rates (Dmet) from the Zhuoshui Catchment are highest in the slate-dominated headwaters (4-8 mm/yr), and much lower (1-2 mm/yr) along the mid-lower reaches with mixed lithologies. At the basin-wide scale, we find a poor correlation between Dmet and basin-averaged channel steepness despite a small climatic gradient. Because large lithological heterogeneities exist in this basin, we invoke a lithological effect to explain this poor correlation. Relying on a revised stream power incision model that incorporates rock erodibility, the resulting lithology- and runoff- adjusted ksn (kLrsn) can be reconciled with denudation rates with the highest erodibility predicted to prevail in the Miocene slate of low metamorphic grade and high fracture density. This model suggests that the lithological heterogeneity can alter the coupling between surface denudation and channel morphology. On a broader perspective, the successful application of the 10Be (meteoric)/9Be proxy shows its applicability as a tracer for erosion and sediment transport processes in fast-eroding mountain belts underlain by slate lithologies.

JGR-ES editor Mikael Attal wrote in “Editors’ Highlight”: “…This study bridges a significant gap: it demonstrates that meteoric 10Be can be used to quantify erosion rates in catchments with a range of lithologies exposed. It proposes a new framework to quantify differences in rock resistance to erosion and demonstrate their impact on landscape steepness, with implications for retrieving erosional signals from topographic data.”

Cite: Deng, K., Yang, S., von Blanckenburg, F., & Wittmann, H. [2020]. Denudation rate changes along a fast‐eroding mountainous river with slate headwaters in Taiwan from 10Be (meteoric)/9Be ratios. Journal of Geophysical Research: Earth Surface, 125, e2019JF005251.

Eos Editors’ Highlight:https://eos.org/editor-highlights/meteoric-10be-reveals-lithological-control-on-erosion-rates

Full article:https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JF005251

“大陆边缘沉积与环境变迁” ——2019年度学术年会召开 2019 Annual Meeting of Marine Sedimentology was held

        2020年1月11-12日,由海洋与地球科学学院海洋沉积组承办的“大陆边缘沉积与环境变迁”2019年度学术年会在同济大学海洋楼成功召开。本次年会吸引了来自同济大学、南京大学、华东师范大学、青岛海洋地质研究所、厦门大学、复旦大学、上海交通大学、上海海洋大学、云南大学、河南理工大学、中国极地研究中心、德国亥姆霍兹波茨坦地学研究中心(GFZ)等国内外12个单位的100多名专家学者和研究生代表参加。

        本次会议围绕“第四纪沉积与资源效应”、“大陆物质源汇过程与环境变迁”、“河口边缘海现代过程与环境事件”和“KECES航次成果交流”等专题作了学术报告,展示了各自团队最新研究成果和进展。在范代读教授的倡导下,本次年会专门设立了“三分钟讲展板”的环节,共有20余位青年学者和学生代表登台介绍了自己的海报,获得了良好的展示和交流效果。

(贺治伟 撰稿|李超 审校)