首页> 外文期刊>Geochemistry, geophysics, geosystems >Constraining the Early Eruptive History of the Mono Craters Rhyolites, California, Based on 238238 U‐ 230230 Th Isochron Dating of Their Explosive and Effusive Products
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Constraining the Early Eruptive History of the Mono Craters Rhyolites, California, Based on 238238 U‐ 230230 Th Isochron Dating of Their Explosive and Effusive Products

机译:基于的基于 238 238 u- 230 230 他的爆炸性和散发性产品的同学约会

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Abstract > The Mono Craters are an overlapping chain of at least 28 domes and coulees located south of Mono Lake, east central California, and represent the most recent eruptions of high‐silica rhyolite magma in the Mono Lake‐Long Valley volcanic region. Regionally widespread tephra fall deposits from the Mono Craters serve as important chronostratigraphic markers for correlations of late Quaternary terrestrial archives in the western United States. A well‐resolved eruption chronology for the Mono Craters is thus not only critical for volcanic hazard considerations but also for paleoclimatic and paleomagnetic studies. Here we constrain the timing of early Mono Craters volcanism using ion microprobe 238 U‐ 230 Th dating of unpolished crystal faces of autocrystic zircon and allanite microphenocrysts, which samples the final stage of crystallization prior to eruption. The stratigraphically oldest domes (biotite‐bearing rhyolites) yield 238 U‐ 230 Th isochron dates between ca. 42 and ca. 19?ka and are unambiguously linked to dated tephras in the Wilson Creek formation of ancestral Mono Lake via coupled 238 U‐ 230 Th geochronology and titanomagnetite geochemistry. The second oldest set of domes (orthopyroxene‐bearing rhyolites) have overlapping 238 U‐ 230 Th isochron dates that are within uncertainty of published K/Ar and 40 Ar/ 39 Ar dates for the fayalite‐bearing rhyolite domes, suggesting a period of intense effusive activity for the Mono Craters near the Pleistocene‐Holocene boundary. Our new and previously published 238 U‐ 230 Th dates for tephras in the Wilson Creek formation provide robust geochronologic constraints for the controversial geomagnetic excursion recorded in the Wilson Creek formation. </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”> <标题类型=“main”>抽象</ title> > 单声道陨石坑是位于加利福尼亚州蒙诺湖南部的至少28个圆顶和Coulees的重叠链,并且代表了在Mono Lake-Long Valley火山地区的高二氧化硅流狼岩浆的最新爆发。从Mono陨石坑的区域广泛的Tephara沉积物作为重要的计时标志物,用于美国西部的后期四季陆地档案的相关性。单声道陨石坑的爆发性比较不仅对于火山危害考虑而令人担忧,而且是对古叶症危害的影响,而且是对古叶病症危害的影响。在这里,我们使用离子微探针约束早期单陨石坑的时间 238 </ sup> u- 230 </ sup> 自动晶体锆石和亚硅酸盐微晶的未亮的晶面的约会,其在喷发之前对结晶的最终阶段进行样品。地层上最古老的圆顶(Biotite-uhatolites)产量 238 </ sup> u- 230 </ sup> CA之间的同胞日期。 42和CA。 19?Ka,并毫不含糊地与日期的Tephras联系在于威尔逊溪的祖先Mono Lake通过Comecoded 238 </ sup> u- 230 </ sup> Th地理学和泰坦诺磁磁石地球化学。第二组最古老的圆顶(含性骨折流细胞晶体)具有重叠 238 </ sup> u- 230 </ sup> 在发布的K / AR的不确定性内的同种象日期 40 </ sup> ar / 39 </ sup> 含Fayalite的流纹岩圆顶的AR日期,表明在全新世 - 全新世界附近的单声道陨石坑的一段时间的激活活动。我们的新和以前发表 238 </ sup> u- 230 </ sup> Wilson Creek Creek中Tephras的日期为威尔逊溪组中录制的有争议的地磁游览提供了强大的地质古代约束。 </ 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>2019年第3期</span><b style="margin: 0 2px;">|</b><span>共18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=Marcaida Mae&option=202" target="_blank" rel="nofollow">Marcaida Mae;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Vazquez Jorge A.&option=202" target="_blank" rel="nofollow">Vazquez Jorge A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Stelten Mark E.&option=202" target="_blank" rel="nofollow">Stelten Mark E.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Miller Jonathan S.&option=202" target="_blank" rel="nofollow">Miller Jonathan S.;</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>Volcano Science CenterU.S. Geological SurveyMenlo Park CA USA;</p> <p>SHRIMP‐RG LaboratoryU.S. Geological SurveyStanford CA USA;</p> <p>Volcano Science CenterU.S. Geological SurveyMenlo Park CA USA;</p> <p>Department of GeologySan Jose State UniversitySan Jose CA USA;</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=high‐silica rhyolites&option=203" rel="nofollow">high‐silica rhyolites;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Mono Craters&option=203" rel="nofollow">Mono Craters;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=U‐Th geochronology&option=203" rel="nofollow">U‐Th geochronology;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=allanite and zircon isochron&option=203" rel="nofollow">allanite and zircon isochron;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=SHRIMP‐RG&option=203" rel="nofollow">SHRIMP‐RG;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wilson Creek formation&option=203" rel="nofollow">Wilson Creek formation;</a> </p> <div class="translation"> 机译:高二氧化硅流鼻菌素;单陨石坑;U-Theochronology;allanite和锆石等货舱;虾rg;威尔逊溪组; 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