Chronology and Tectonic Evolution of the Southern Anti-Atlas Orogen, Morocco

摩洛哥南反阿特拉斯造山带的年代学和构造演化

基本信息

批准号：
0106853
负责人：
Scott Samson
金额：
$ 23.91万
依托单位：
Syracuse University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2001
资助国家：
美国
起止时间：
2001-06-15 至 2005-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106853&HistoricalAwards=false
关键词：
Chronology Tectonic Evolution Southern Anti

项目摘要

0106853SamsonSubstantial advances have been made in recent years in the understanding of the geological evolution of several major North American and European 'pan-African' Neoproterozoic (750-550 million year old) terranes, but there is still a fundamental gap in the knowledge of 'pan-African' orogenic belt evolution in Africa itself. Much of the uncertainty about the accretionary history of the African Neoproterozoic orogens stems from the limited database of reliable radiometric ages of structurally important units, combined with a lack of detailed modern kinematic analysis in these deformed regions. These critical data are being collected by performing combined structural, uranium-lead geochronological, and neodymium-lead-hafnium isotopic analyses of one of the pivotal Neoproterozoic African orogens, the Anti-Atlas orogen of Morocco. Through a detailed structural analysis of the deformed rocks in the region, combined with high precision uranium-lead zircon age determinations, many significant questions about the accretionary history of the southern Anti-Atlas belt are being answered. Such questions include the age and timing of obduction of ocean-floor crust (ophiolites), the relationship of these ophiolites to one another, the connections between arc-terranes to the north with ophiolites and an associated blueschist belt to the south, the age and nature of the basement of these terranes, the degree of interaction of basement with Neoproterozoic magmas, and the timing of accretion of these terranes to the West African Craton. Through modern, multi-disciplinary studies the geological 'family-tree' of the circum-Atlantic terranes with the orogens surrounding the West African Craton is being established.

近年来，在了解北美和欧洲主要的“泛非”新元古代（750-5.55亿年）的地质发展方面，近年来已经取得了0106853SAMSONSONS-SUBSTANTIAL的进步，但对于“ Pan-African'den-African'骨基型皮带进化），仍然存在着根本的差距。非洲新元古代植物的增生历史的许多不确定性源于有限的结构重要单位可靠辐射年龄的数据库，加上在这些变形区域中缺乏详细的现代运动学分析。这些关键数据是通过对摩洛哥的抗摩洛哥的抗 - atlas骨基因组合的结构性结构，铀铅的结合，铀领导的年代学和新近山脉的同位素分析进行收集的。通过对该地区变形岩石的详细结构分析，再加上高精度的铀潜在锆石年龄的确定，正在回答有关南部抗阿特拉斯带的增生历史的许多重要问题。 Such questions include the age and timing of obduction of ocean-floor crust (ophiolites), the relationship of these ophiolites to one another, the connections between arc-terranes to the north with ophiolites and an associated blueschist belt to the south, the age and nature of the basement of these terranes, the degree of interaction of basement with Neoproterozoic magmas, and the timing of accretion of these terranes to the West非洲克拉顿。通过现代的，多学科的研究，正在建立与西非克拉顿周围的牛根群体的地质“家庭树”。