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COLLABORATIVE RESEARCH: 40 Ar/39 Ar and Structural Investi-gation and Constraints for the Tectonothermal Evolution of the Avalon Composite Terrane, SW New Brunswick

合作研究：新不伦瑞克省西南部阿瓦隆复合地体的 40 Ar/39 Ar 和结构研究及构造热演化约束

基本信息

批准号：
9004024
负责人：
R. David Dallmeyer
金额：
$ 9.99万
依托单位：
University of Georgia Research Foundation Inc
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1990
资助国家：
美国
起止时间：
1990-08-01 至 1994-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9004024&HistoricalAwards=false
关键词：
COLLABORATIVE RESEARCH 40 Ar 39

项目摘要

The Avalon composite terrane of the northern Appalachian orogen represent a college of tectonostratigraphic terranes that were amalgamated in the late Precambrian, accreted as a composite terrane to North America during the early-middle Paleozoic, and were subsequently dispersed variable distances relative to each other. Identification of the constituent terrane elements within the composite terrane has been controversial, their tectonothermal evolution is uncertain, and the nature and timing of amalgamation, accretion and dispersal are poorly constrained. This project will address these issue through a comprehensive structural and 40Ar/39Ar geochronological study of a representative portion of the Avalon composite terrane in southwestern New Brunswick where recent studies have shown an important late Precambrain terrane boundary may exist. Results of a reconnaissance 40Ar//39Ar isotopic survey indicate that a significant contribution can be made in the proposed study area. The project couples detailed structural mapping kinematic analysis and petrological studies with a program of 40Ar/39Ar mineral dating designed to resolve the region's tectonothermal evolution. The study will substantially improve knowledge of the nature, timing and kinematics of tectonothermal events recorded in the Avalon composite terrane and, thereby, will greatly facilitate the identification and correlation of constituent late Precambrian terranes.

阿巴拉契亚造山带北部的阿瓦隆复合地体代表了一组构造地层地体，这些地体在前寒武纪晚期合并，在早中古生代期间作为复合地体吸积到北美，随后相互分散不同的距离。复合地体中组成地体元素的识别一直存在争议，它们的构造热演化是不确定的，并且合并、吸积和扩散的性质和时间很少受到限制。该项目将通过对新不伦瑞克省西南部阿瓦隆复合地体的代表性部分进行全面的结构和 40Ar/39Ar 地质年代学研究来解决这些问题，最近的研究表明那里可能存在重要的晚前寒武纪地体边界。 40Ar//39Ar 同位素勘察结果表明，可以在拟议的研究区域做出重大贡献。该项目将详细的结构测绘运动学分析和岩石学研究与 40Ar/39Ar 矿物测年计划结合起来，旨在解决该地区的构造热演化问题。这项研究将大大提高对阿瓦隆复合地体中记录的构造热事件的性质、时间和运动学的认识，从而极大地促进晚前寒武纪地体成分的识别和关联。