Trial by fire:Testing the paleolongitude of Pangea of competing reference frames with the African LL

来源 :地学前缘(英文版) | 被引量 : 0次 | 上传用户:liuyong402
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Paleogeography can be reconstructed using various crust- or mantle-based reference frames that make funda-mentally different assumptions. The various reconstruction models differ significantly in continental paleo-longitude, but it has been difficult to assess which models are more valid. We suggest here aLLSVP test, where an assumed correlation between present-day large low velocity shear-wave provinces and the paleogeography of supercontinent Pangea at breakup ca. 200 million years ago can be used to assess the relative accuracy of pub-lished reconstructions. Closest correlations between continental paleolongitude and the African LLSVP are ach-ieved with mantle-based reference frames (moving hotspots and true polar wander), whereas shallower crust-based reference frames are shown to be invalid. The relative success of mantle-based frames, and thus the importance of the depth of reference frame, supports the notion that mantle convection is largely vertical compared to the horizontal plate motion of tectonics.
其他文献
目的探索姜黄素灌胃改善顺铂导致的胃排空障碍的机制是否通过影响乙酰胆碱含量变化,探索姜黄素可能的作用途径和机制,为今后临床应用姜黄素,尤其在减轻顺铂胃肠道副作用方面的应用提供必要的理论基础,同时也为姜黄素在其它胃肠道疾病方面的开发应用提供理论基础。方法昆明种雄性小鼠32只,随机分为对照组、顺铂组、姜黄素+顺铂组和单用姜黄素组,每组8只。姜黄素(200mg/kg)每天灌胃一次,共15天,其余组用溶媒溶
2013年4月29日,美国瓷砖和石材展Coverings首次在亚特兰大举行,展会持续到5月2日,为期四天。来自全球50多个国家和地区的超过900多名展商参加了本次展会,其中美国展团由104家
主研人员:陈光喻胜河丕雁郭崴等可视化自动测试生成系统主要研究以高档微型计算机为测试主控计算机的硬件平台以及测试软件自动生成系统,是现代测试技术与计算机技术综合应用。
福建省各地各部门采取放宽部分外来工落户限制,在外来工集中的开发区和工业园区配建保障房等多项措施,加快解决外来工住房保障问题。该省要求,在外来工集中的开发区和工业园
前言:  心肌梗死是当今世界最常见的心血管事件之一,治疗时恢复血流灌注却可能因为活性氧的产生等而导致缺血再灌注损伤。一氧化氮合酶(Nitric oxide synthase,NOS)可通过催化
Twenty-one species of the genus Eoophyla Swinhoe, 1900 are recognized from China, of which 7 species are described as new to science, namely E. tenuisa sp. nov.
Impact diamond is one of perspective natural type of superhard carbon materials, forming huge resources sometimes, such as Popigai impact structure counting the
Anew species of Celidodacus Hendel, C. parafenestratus Chen & Freidberg, sp. nov. from Democratic Republic of Congo, is described and illustrated. Redescription
目的:分析2013年~2015年我院手足口病的临床及病原学特征,为制定我市手足口病防控措施提供科学依据。方法:收集2013年1月~2015年12月青岛市妇女儿童医院手足口病病例资料,分