Elucidating the migration processes of zinc (Zn) is crucial for comprehending its influence on global biogeochemical cycling. However, significant gaps remain in the knowledge of these processes in glacier-fed rivers of the northeast Tibetan Plateau (NETP). This study determined the isotopic compositions (δ⁶⁶Zn) of dissolved and particulate Zn in three alpine rivers fed by the Laohugou Glacier (LHG), the Lenglongling Glacier (LG), and the Yuzhufeng Glacier (YG) in the NETP. Results show that the δ⁶⁶Zn of particulate Zn varies from −0.01 ± 0.04 to +0.97 ± 0.12‰, generally higher than that of dissolved Zn (−0.82 ± 0.06 to +0.19 ± 0.03‰). This suggests a migration behavior in which isotopically lighter Zn is enriched in the dissolved phase and isotopically heavier Zn preferentially adsorbs onto the particulate matter. Moreover, the δ⁶⁶Zn in the dissolved phase exhibits obvious spatial variation, with an upward trend from the LHG-fed river to the YG-fed river and subsequently to the LG-fed river. In contrast, this trend is less pronounced in the particulate phase due to an anomalously high δ⁶⁶Zn value (0.97 ± 0.12‰). This isotopic anomaly is primarily attributed to anthropogenic impacts. A comparison with global terrestrial aquatic environments emphasizes the unique response of Zn isotope variability in NETP glacier-fed rivers to both migration processes and anthropogenic impacts.

中文翻译：

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青藏高原东北部冰川补给高山河流的 Zn 同位素组成变化：对迁移过程和人为影响的响应


阐明锌 （Zn） 的迁移过程对于理解其对全球生物地球化学循环的影响至关重要。然而，在青藏高原东北部 （NETP） 冰川补给河流中，对这些过程的了解仍然存在很大差距。本研究测定了 NETP 中老虎沟冰川 （LHG）、冷龙岭冰川 （LG） 和玉竹峰冰川 （YG） 喂养的三条高山河流中溶解和颗粒 Zn 的同位素组成 （^{δ 66}Zn）。结果表明，颗粒 Zn 的⁶⁶Zn δ变化± 0.04 到 +0.97 ± 0.12‰，通常高于溶解的 Zn 的 Zn （-0.82 ± 0.06 至 +0.19 ± 0.03‰）。这表明一种迁移行为，其中同位素较轻的 Zn 在溶解相中富集，而同位素较重的 Zn 优先吸附到颗粒物上。此外，溶解相中^{δ 66}Zn 表现出明显的空间变化，从 LHG 补给河流到 YG 补流河流，然后到 LG 补流河流呈上升趋势。相比之下，由于锌值异常δ高（0.97 ± 0.12‰），这种趋势在颗粒相中不太明显。这种同位素异常主要归因于人为影响。与全球陆地水生环境的比较强调了 NETP 冰川补给河流中 Zn 同位素变化对迁移过程和人为影响的独特响应。