中新世全球重要事件及其意义:数据挖掘的启示

发布时间：2018-05-18 16:18

本文选题：中新世 + 事件　；参考：《科学通报》2017年15期

【摘要】：GEOROC(Geochemistry of Rocks of the Ocean-sand Continents)是大陆和海洋岩石的地球化学数据库,利用该数据库着重研究了全球新生代汇聚边缘安山岩和玄武岩、裂谷安山岩和玄武岩、洋岛安山岩和玄武岩、埃达克岩等岩浆岩的时空分布特征.结果表明,全球岩浆活动或在中新世开始活跃,或在中新世达到巅峰状态.形成于不同构造环境的岩浆岩具有不同的地质意义:汇聚边缘岩浆岩发育,暗示板块俯冲作用强烈;裂谷岩浆岩大量喷发,表示发育与板块扩张有关的岩浆活动;洋岛岩浆岩迅速增加,指示下地幔异常活跃;埃达克岩广泛分布,表明许多地方受到构造挤压作用,导致地壳加厚.由此推测,全球在中新世可能发生了一次重大的、全球性的岩浆事件.除此之外,全球中新世还发生了一系列重要事件,如青藏高原的隆升及黄土高原的形成、安第斯的抬升、地中海的干涸、全球荒漠化以及西太平洋边缘海盆的发育等.岩浆活动与构造运动通常是相伴而生的,二者间的相互作用改变了古地理、古气候、古环境.中新世剧烈的岩浆活动与构造活动相互作用可能导致地壳加厚或隆起,形成的山脉、高原改变了原有的地形地貌,影响了大气环流,从而改变了地表环境.因此,研究中新世岩浆-构造-气候-环境之间的相互关系,可能是目前和未来一个需要地学工作者长期探索的课题.此外,随着大数据技术的不断发展,科学研究也逐渐步入大数据时代.从全体数据出发,探讨数据之间的关联关系,或许为今后的科研工作提供了一个新的思路.
[Abstract]:GEOROC(Geochemistry of Rocks of the Ocean-sand Continents, a geochemical database of continental and marine rocks, has been used to study the Cenozoic converging marginal andesite and basalt, rift andesite and basalt, oceanic island andesite and basalt. Spatial and temporal distribution of magmatic rocks such as adakite. The results show that the global magmatic activity either became active during the Miocene or reached its peak state in the Miocene. The magmatic rocks formed in different tectonic environments have different geological significance: magmatic rocks on the convergence margin are developed, indicating a strong plate subduction, a large number of rift magmatic rocks erupt, indicating the development of magmatic activities related to plate expansion; The rapid increase of oceanic island magmatic rocks indicates that the lower mantle is abnormally active and the adakite is widely distributed indicating that the crust is thickened by tectonic compressions in many places. It is assumed that a major global magma event may have occurred in the Miocene. In addition, a series of important events occurred in the global Miocene, such as the uplift of the Qinghai-Tibet Plateau and the formation of the Loess Plateau, the uplift of the Andes, the drying up of the Mediterranean Sea, global desertification and the development of the basin on the edge of the western Pacific Ocean. Magmatic activity and tectonic movement are usually associated with each other, and the interaction between them changes paleogeography, paleoclimate and paleoenvironment. The intense interaction between magmatic activity and tectonic activity in Miocene may lead to the thickening or uplift of the crust and the formation of mountain ranges and the plateau has changed the original topography and geomorphology, affected the atmospheric circulation, and thus changed the surface environment. Therefore, the study of the relationship between magma, tectonics, climate and environment in the Miocene may be a subject that geoscientists need to explore for a long time at present and in the future. In addition, with the continuous development of big data technology, scientific research has gradually stepped into the era of big data. Based on the whole data, this paper discusses the relationship between the data, which may provide a new idea for the future scientific research.
【作者单位】：西北大学地质学系大陆动力学国家重点实验室;中国科学院地质与地球物理研究所;中山大学地球科学与地质工程学院;
【基金】：大陆动力学国家重点实验室自主研究课题创新团队发展计划(IRT1281)资助
【分类号】：P534.621

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