Quantitative Relationships Between Basalt Geochemistry, Shear Wave Velocity, and Asthenospheric Temperature Beneath Western North America

Kl?cking M.; White N. J.; Maclennan J.; McKenzie D.; Fitton J. G.

摘要

Abstract >Western North America has an average elevation that is ～2?km higher than cratonic North America. This difference coincides with a westward decrease in average lithospheric thickness from ～240 to 100?km. Tomographic models show that slow shear wave velocity anomalies lie beneath this region, coinciding with the pattern of basaltic magmatism. To investigate relationships between magmatism, shear wave velocity, and temperature, we analyzed a suite of 260 basaltic samples. Forward and inverse modeling of carefully selected major, trace, and rare earth elements were used to determine melt fraction as a function of depth. Basaltic melt appears to have been generated by adiabatic decompression of dry peridotite with asthenospheric potential temperatures of 1340 ± 20?°C. Potential temperatures as high as 1365?°C were obtained for the Snake River Plain. For the youngest (i.e., 5?Ma) basalts with a subplate geochemical signature, there is a positive correlation between shear wave velocities and trace element ratios such as La/Yb. The significance of this correlation is explored by converting shear wave velocity into temperature using a global empirical parameterization. Calculated temperatures agree with those determined by inverse modeling of rare earth elements. We propose that regional epeirogenic uplift of western North America is principally maintained by widespread asthenospheric temperature anomalies lying beneath a lithospheric plate, which is considerably thinner than it was in Late Cretaceous times. Our proposal accounts for the distribution and composition of basaltic magmatism and is consistent with regional heat flow anomalies. </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”XML：Lang =“EN”XML：ID =“GGGE21659-ABS-ABS-0001”> <标题类型=“main”>抽象</ title> >西北美国的平均海拔高度高于克拉廷北美高2 km。这种差异与平均岩石厚度的向西降低到〜240至100μm。断层模型表明，慢速剪切波速度异常躺在这个地区下方，与玄武岩岩浆岩的模式恰逢。为了调查岩浆，剪切波速度和温度之间的关系，我们分析了一套＆ 260玄武类样品。仔细选择的主要，痕迹和稀土元素的前向和逆建模用于以深度的函数确定熔体级分。玄武岩熔体似乎是通过绝热减压而产生的干燥阶层，其具有1340±20Ω·℃的哮喘潜在温度。为蛇河平原获得高达1365°C的潜在温度。对于具有亚板球化学签名的最小（即，＆ 5？ma）底座，剪切波速度与La / Yb等痕量元素比之间存在正相关。通过使用全局经验参数化将剪切波速度转换为温度来探索这种相关性的重要性。计算的温度与通过罕见地球元素的逆建模确定的温度同意。我们提出西北西部的区域嗜省膨胀隆起主要由围着岩石岩板下方的广泛的哮喘温度异常来维持，这比在晚期白垩统时间稀释。我们的提案占玄武岩岩浆广告的分布和组成，与区域热流异常一致。</ 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>2018年第9期</span><b style="margin: 0 2px;">|</b><span>共29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=Kl?cking M.&option=202" target="_blank" rel="nofollow">Kl?cking M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=White N. J.&option=202" target="_blank" rel="nofollow">White N. J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Maclennan J.&option=202" target="_blank" rel="nofollow">Maclennan J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=McKenzie D.&option=202" target="_blank" rel="nofollow">McKenzie D.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Fitton J. G.&option=202" target="_blank" rel="nofollow">Fitton J. G.;</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>Bullard Laboratories Department of Earth SciencesUniversity of CambridgeCambridge UK;</p> <p>Bullard Laboratories Department of Earth SciencesUniversity of CambridgeCambridge UK;</p> <p>Bullard Laboratories Department of Earth SciencesUniversity of CambridgeCambridge UK;</p> <p>Bullard Laboratories Department of Earth SciencesUniversity of CambridgeCambridge UK;</p> <p>Grant Institute School of GeoSciencesUniversity of EdinburghEdinburgh UK;</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;"> </p> </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/0704023360563.html">Quantitative Relationships Between Basalt Geochemistry, Shear Wave Velocity, and Asthenospheric Temperature Beneath Western North America</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kl?cking M.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Kl?cking M.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=White N. 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