跃进山增生杂岩中变质碎屑岩的锆石U-Pb年代学、Hf同位素组成及其地质意义

批准号:
42002065
项目类别:
青年科学基金项目
资助金额:
24.0 万元
负责人:
毕君辉
学科分类:
岩石学
结题年份:
2023
批准年份:
2020
项目状态:
已结题
项目参与者:
毕君辉
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中文摘要
本项研究拟通过对跃进山增生杂岩中出露变质碎屑岩的岩石学、矿物学、碎屑锆石U-Pb年代学和Lu-Hf同位素的系统研究,确定跃进山增生杂岩中变质碎屑岩的原岩类型和沉积时限,探讨变质碎屑岩的物质来源和沉积演化,并与饶河增生杂岩进行对比研究,揭示跃进山增生杂岩和饶河增生杂岩的演化关系。本项研究不仅对查明跃进山增生杂岩的构造属性,恢复那丹哈达地体和佳木斯地块东缘晚古生代以来的俯冲-增生历史提供关键制约,而且对深化理解东亚大陆边缘不同类型(时代)增生杂岩的俯冲-增生过程具有重要的理论价值。
英文摘要
This project will conduct a systematic study of petrology, mineralogy, and zircon U-Pb geochronology and Lu-Hf isotope for the meta-detrital rocks from the Yuejinshan accretionary complex, in order to (1) determine their protolith types and depositional ages; and (2) discuss their material sources and depositional evolution; and (3) compare the results with those of the Raohe accretionary complex, and further reveal the evolutionary relationship between the Yuejinshan and Raohe accretionary complexes. This project not only provides key constraints on clarifying the tectonic nature of the Yuejinshan accretionary complex, and reconstructing the subduction-accretion history of the Nadanhada Terrane and the eastern margin of Jiamusi Massif since the late Paleozoic, but also has an significant theoretical value for deepening the understanding of the subduction-accretion processes of different types (ages) of accretionary complexes on the continental margin of East Asia.
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