Paleomagnetic Investigation of Rock Formations from Junggar Basin, NW China

中国西北准噶尔盆地岩层古地磁调查

• 批准号: 1250444
• 负责人: Xixi Zhao
• 金额: $ 30.7万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-01 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1250444&HistoricalAwards=false
• 关键词: Paleomagnetic; Investigation; Rock; Formations; Junggar

Plate tectonic theory postulates that the Earth's lithosphere is broken into tectonic plates or blocks that move and slide past or toward each other over geological time. Our knowledge of the kinematics and duration of collisional events between various Chinese tectonic blocks and Siberia is still poorly known. Similarly, the accretionary history of the Central Asian fold belt itself is contentious. A lack of basic information regarding the tectonic assembly of asia hinders our understanding of the complex tectonic history of this region. The primary goal of this research is to study the Paleozoic and Mesozoic rocks from the Junggar Basin, Northwest China, to address key questions that are currently debated: Terrane Accretionary History of the Central Asian Belt; Coherence of the Junggar Basin; and Excessive Crustal Shortening. A common thread running through the proposed work is to obtain reliable paleomagnetic data bearing on the tectonic and geodynamic evolution of Asia, including the sequence of configurations leading up to collision of oceanic terranes and continental blocks along its southern margin and the large-scale displacements and rotations that ensued during the long process of accretion. To address these questions we are collecting paleomagnetic and geochronologic samples from the Junggar Basin. In addition to the scientific objectives of this research, the project is contributing to the education of graduate and undergraduate students in a STEM discipline and is promoting significant international collaboration with scientists from Taiwan and The Peoples Republic of China. Geophysical insight and refinement of paleogeographic maps from this study may help identify the ancient environments that were conducive to the formation of the rare-metal mineralization and petroleum potential in the central Asian belt region. The scientific results from this project will be germane to a broad range of scientists studying continental tectonics with interests ranging from the growth of the lithosphere to deep-mantle dynamics to examining questions regarding possible relations between plume activity, large igneous province production, and geomagnetic polarity superchrons. The data from this study will be presented at national meetings, reported to the NSF, and disseminated in peer-reviewed, high-profile international journal articles and web-based paleomagnetic database for wider dissemination. This award is co-funded by NSF's Office of International Science and Engineering.

板块构造理论假设，地球的岩石圈被分解成构造板块或块体，这些板块或块体在地质时期内相互移动、滑过或相向。我们对中国不同构造块与西伯利亚之间碰撞事件的运动学和持续时间的了解仍然知之甚少。同样，中亚褶皱带本身的增生历史也存在争议。缺乏有关亚洲构造组合的基本信息阻碍了我们对该地区复杂构造历史的理解。本研究的主要目标是研究中国西北准噶尔盆地的古生代和中生代岩石，以解决目前争论的关键问题：中亚带的地体增生史；准噶尔盆地的一致性；和地壳过度缩短。贯穿拟议工作的一个共同主线是获得有关亚洲构造和地球动力学演化的可靠古地磁数据，包括导致沿其南缘的海洋地体和大陆块碰撞的构造序列以及大规模的位移和变化。在漫长的吸积过程中发生的旋转。为了解决这些问题，我们正在从准噶尔盆地收集古地磁和地质年代学样本。除了这项研究的科学目标外，该项目还为研究生和本科生的 STEM 学科教育做出贡献，并促进与台湾和中华民国科学家的重要国际合作。这项研究的地球物理洞察和古地理图的完善可能有助于确定有利于中亚带区域稀有金属矿化和石油潜力形成的古代环境。该项目的科学成果将与研究大陆构造的广大科学家密切相关，这些科学家的兴趣范围从岩石圈的生长到深部地幔动力学，再到研究羽流活动、大型火成岩省的产生和地磁极性之间可能存在的关系。超级时间。这项研究的数据将在国家会议上提出，向美国国家科学基金会报告，并通过同行评审、备受瞩目的国际期刊文章和基于网络的古地磁数据库进行更广泛的传播。该奖项由美国国家科学基金会国际科学与工程办公室共同资助。