Downstream and seasonal changes of lithium isotope ratios in the Ganges‐Brahmaputra river system

Manaka Takuya; Araoka Daisuke; Yoshimura Toshihiro; Hossain H. M. Zakir; Nishio Yoshiro; Suzuki Atsushi; Kawahata Hodaka

摘要

Abstract > The Li isotope ratio (δ 7 Li) is expected to be a useful tracer of silicate weathering in river and groundwater systems, which is an important contributor to the seawater compositional changes that accompany the evolution of the Earth's surface environment. To obtain accurate estimates of continental Li fluxes to the ocean, we determined δ 7 Li values of dissolved Li in the lower Ganges‐Brahmaputra river system in both the dry and rainy seasons, and in deep groundwater in the Bengal basin. Dissolved Li and δ 7 Li values in the lower reaches of the rivers (0.04–0.66 μmol kg ?1 and +19.1‰ to +34.2‰, respectively) were predominantly derived from silicate weathering, as is the case in the upper parts of these rivers. We observed large changes in δ 7 Li over a distance of more than 1000 km downstream that were due mainly to Rayleigh‐type removal of Li from river water. Extremely high Li concentrations (1.15–1.67 μmol kg ?1 ) and low δ 7 Li values (+5.1‰ to +11.6‰) in groundwater samples indicate congruent isotope leaching and dissolution of silicate minerals in the deep aquifer, where the water residence time is long. In the rainy season, Li concentrations and δ 7 Li values were lower than in the dry season, owing to the shorter residence time of river water and the substantial input of local subsurface flow through lowland alluvium. These results suggest that accurate estimation of continental Li fluxes to the ocean should take account of downstream and seasonal changes, as well as aquifer depth variations, in δ 7 Li values. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”> <标题类型=“main”>抽象</ title> > 锂同位素比（δ 7 </ sup> LI）预计是河流和地下水系统中的硅酸盐风化的有用示踪剂，这是海水成分变化的重要因素，伴随着地球表面环境的演变。为了获得对海洋的大陆锂通量的准确估计，我们确定了δ 7 </ sup> 孟加拉盆地下龙龙河河流系统溶解李的价值观。溶解Li和δ 7 </ sup> 河流下游的LI值（0.04-0.66μmolkg ？1 </ sup> 分别是+ 19.1‰至+ 34.2‰，主要来自硅酸盐风化，就像这些河流的上部一样。我们观察到δ的大变化 7 </ sup> 李在下游超过1000公里的距离，主要是由于河水的瑞利型去除李。极高的Li浓度（1.15-1.67μmolkg ？1 </ sup> ）和低δ 7 </ sup> 地下水样品中的Li值（+ 5.1‰至+ 11.6‰）表示一致同位素浸出和深层含水层中硅酸盐矿物的溶解，水停留时间很长。在雨季，李浓度和δ 7 </ sup> 由于河水的停留时间较短，李价值低于干燥季节，并通过低地加剧的局部地下流动的大量投入。这些结果表明，对海洋的大陆锂通量的准确估计应考虑到下游和季节性变化，以及含水层深度变化，在δ中 7 </ sup> 李价值观。 </ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2017年第8期</span><b style="margin: 0 2px;">|</b><span>共13页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Manaka Takuya&option=202" target="_blank" rel="nofollow">Manaka Takuya;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Araoka Daisuke&option=202" target="_blank" rel="nofollow">Araoka Daisuke;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Yoshimura Toshihiro&option=202" target="_blank" rel="nofollow">Yoshimura Toshihiro;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hossain H. M. Zakir&option=202" target="_blank" rel="nofollow">Hossain H. M. Zakir;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nishio Yoshiro&option=202" target="_blank" rel="nofollow">Nishio Yoshiro;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Suzuki Atsushi&option=202" target="_blank" rel="nofollow">Suzuki Atsushi;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kawahata Hodaka&option=202" target="_blank" rel="nofollow">Kawahata Hodaka;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Center for Advanced Marine Core Research Kochi UniversityKochi Japan;</p> <p>Geological Survey of JapanNational Institute of Advanced Industrial Science and TechnologyTsukuba Japan;</p> <p>Atmosphere and Ocean Research Institute The University of TokyoKashiwa Japan;</p> <p>Atmosphere and Ocean Research Institute The University of TokyoKashiwa Japan;</p> <p>Center for Advanced Marine Core Research Kochi UniversityKochi Japan;</p> <p>Geological Survey of JapanNational Institute of Advanced Industrial Science and TechnologyTsukuba Japan;</p> <p>Geological Survey of JapanNational Institute of Advanced Industrial Science and TechnologyTsukuba Japan;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Li isotopes&option=203" rel="nofollow">Li isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=silicate weathering&option=203" rel="nofollow">silicate weathering;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ganges‐Brahmaputra Rivers&option=203" rel="nofollow">Ganges‐Brahmaputra Rivers;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=groundwater&option=203" rel="nofollow">groundwater;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=riverine fluxes&option=203" rel="nofollow">riverine fluxes;</a> </p> <div class="translation"> 机译：李同位素;硅酸盐风化;恒河 - Brahmaputra河流;地下水;河流通量; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360724.html">Downstream and seasonal changes of lithium isotope ratios in the Ganges‐Brahmaputra river system</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Manaka Takuya&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Manaka Takuya,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Araoka Daisuke&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Araoka Daisuke,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Yoshimura Toshihiro&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Yoshimura Toshihiro,</a> <a href="/journal-foreign-23285/" target="_blank" rel="nofollow" class="tuijian_authcolor">Geochemistry, geophysics, geosystems .</a> <span>2017</span><span>,第8期</span> </span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：Ganges-Brahmaputra河流系统中锂同位素比的下游和季节变化</span> </p> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/070404672598.html">Lithium isotope fractionation in the Ganges-Brahmaputra floodplain and implications for groundwater impact on seawater isotopic composition</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bagard Marie-Laure&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Bagard Marie-Laure,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=West A. 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