EAPSI:EAPSI: Integrating English and Chinese-Language Literature on the India-Asia Collision to Better Understand the Formation and Evolution of Subduction Complexes

在印度和亚洲相撞形成喜马拉雅山脉之前，大陆之间的大洋板块被俯冲到亚洲之下。在俯冲过程中从大洋板块刮下来的物质被称为俯冲杂岩，是少数进入俯冲带的物质记录之一。大多数物质被俯冲到地幔中，并消失在地质记录中。整合来自中文和英文来源的数据将提供对西藏南部俯冲杂岩的整体了解。该项目将分析和汇编只有中国提供的地图和数据，以及来自英文出版物的地图和数据，以及美国和中国产生的新数据。这项研究将在青藏高原研究所与丁林教授和他的学生合作进行，丁林教授和他的学生在藏南俯冲杂岩方面有广泛的工作经验。这种合作可能导致发现新的被俯冲的大陆碎片，并为俯冲杂岩的发展提供新的模式。该项目将整合藏南俯冲杂岩的范围、变形方式和物源。主要数据将是地图、单元描述、U-Pb碎屑锆石年代学和沉积来源。藏南俯冲杂岩是一个复杂的、很少被研究的单元，它记录了进入俯冲带的物质的来源和变形，几乎全部由块状基质混杂岩组成，比任何其他已记录的俯冲杂岩都要厚得多，混合程度也更高。这种几百万年内数公里宽的块状变形无法用目前的俯冲带模型来解释。该奖项由东亚和太平洋暑期学院项目资助一名美国研究生进行暑期研究，由美国国家科学基金会和中国科技部联合资助。

Before India and Asia collided, forming the Himalayas, the oceanic plate between the continents was subducted beneath Asia. The material scraped off from the oceanic plate during subduction, called a subduction complex, is one of the few records of the material that entered the subduction zone. Most of the material is subducted into the mantle and lost to the geologic record. Integrating data from Chinese-language and English-language sources will provide a holistic understanding of the subduction complex in southern Tibet. This project will analyze and compile maps and data available only in China with those from English-language publications and new data generated in the United States and China. This research will be conducted at the Institute of Tibetan Plateau Research in collaboration with Professor Ding Lin and his students, who have worked extensively on the subduction complex in southern Tibet. The collaboration could lead to the discovery of new continental fragments that were subducted and a new model for how subduction complexes develop. This project will integrate the extent, deformation style, and provenance of the subduction complex in southern Tibet. Primary data will be maps, unit descriptions, U-Pb detrital zircon geochronology, and sedimentary provenance. The subduction complex in southern Tibet is a complicated, little-studied unit that records the source and deformation of materials entering the subduction zone and that is composed almost entirely of block-in-matrix mélange, far thicker and more mixed than any other documented subduction complex. This block-in-matrix style of deformation over kilometers width in a few millions of years is unexplained by current subduction zone models. This award under the East Asia and Pacific Summer Institutes program supports summer research by a U.S. graduate student and is jointly funded by NSF and the Ministry of Science and Technology of China.