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Transitions in the Banda Arc-Australia Continental Collision as a Bridge to Understanding Mantle and Lithospheric Controls on Surface Tectonics

班达弧-澳大利亚大陆碰撞的转变是理解地幔和岩石圈对地表构造控制的桥梁

基本信息

批准号：
1250214
负责人：
A Joshua West
金额：
$ 71.5万
依托单位：
University of Southern California
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2013
资助国家：
美国
起止时间：
2013-07-01 至 2019-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1250214&HistoricalAwards=false
关键词：
Transitions Banda Arc Australia Continental

项目摘要

Eastern Indonesia is one of the least well-understood geological domains of our planet, and yet the region provides a truly remarkable natural experiment for unraveling some of the major puzzles of plate tectonics. The recent collision of the Australian continent with the active volcanic arc in the Banda region effectively captures the initiation of continental mountain building and the cessation of island arc volcanism, offering a rare glimpse into a set of processes that have shaped Earth's evolution over geologic time. Since oceanic subduction and subsequent continental collision have occurred in different stages along the Banda arc, we plan to use the region to study and assess the spatio-temporal evolution of this transition. This work will help fill fundamental gaps in general understanding of collisional tectonics and formulate answers to outstanding questions about the interrelationships between the history of convergence and the present-day crustal, lithospheric and mantle structure, and the way this relates to topography. This study of the Banda arc holds promise for clarifying the relationships between surface uplift, crustal deformation and recycling, lithospheric structure, subduction, and mantle convection. We have assembled an international multidisciplinary research team to constrain a sophisticated dynamical model of regional collision and subduction using passive seismology, topographic analysis, targeted geochronology, and a collaboratively led geodetic campaign. The research group includes scientists from Indonesia, Australia, Germany, the Netherlands, Portugal, and the U.S., and an important outcome will be to strengthen and catalyze future scientific collaboration between these countries. The award is co-funded by the NSF Geophysics and Tectonics Programs, and the Office of International Science and Engineering (OISE). All results, data, and newly developed methods will be shared freely online, benefiting future similar imaging or tectonic modeling efforts.

印度尼西亚东部是我们这个星球上最不为人所知的地质领域之一，然而，该地区为解开板块构造的一些主要谜题提供了一个真正非凡的自然实验。最近澳大利亚大陆与班达地区活跃的火山弧的碰撞有效地捕捉到了大陆山脉形成的开始和岛弧火山活动的停止，为我们提供了一个罕见的机会，让我们得以一窥在地质时期塑造地球进化的一系列过程。由于在班达弧的不同阶段发生了海洋俯冲和随后的大陆碰撞，我们计划利用该区域研究和评估这种转变的时空演变。这项工作将有助于填补对碰撞构造的一般理解的基本空白，并为关于汇聚历史与当今地壳、岩石圈和地幔结构之间的相互关系以及这与地形的关系的突出问题提供答案。对班达弧的研究有望澄清地表隆起、地壳变形和再循环、岩石圈结构、俯冲和地幔对流之间的关系。我们组建了一个国际多学科研究团队，利用被动地震学、地形分析、目标地质年代学和合作领导的大地测量运动，来约束一个复杂的区域碰撞和俯冲动力学模型。该研究小组包括来自印度尼西亚、澳大利亚、德国、荷兰、葡萄牙和美国的科学家，一个重要的成果将是加强和促进这些国家之间未来的科学合作。该奖项由美国国家科学基金会地球物理与构造项目和国际科学与工程办公室（OISE）共同资助。所有的结果、数据和新开发的方法将在网上免费共享，有利于未来类似的成像或构造建模工作。