加拿大Rae克拉通西北部早（约2.4 ~ 2.3 Ga）古元古代演化的同位素约束

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-02-01 DOI:10.1016/j.precamres.2024.107617

R.G. Berman, W.J. Davis, M. Sanborn-Barrie

{"title":"加拿大Rae克拉通西北部早（约2.4 ~ 2.3 Ga）古元古代演化的同位素约束","authors":"R.G. Berman, W.J. Davis, M. Sanborn-Barrie","doi":"10.1016/j.precamres.2024.107617","DOIUrl":null,"url":null,"abstract":"<div><div>Queen Maud block (QMb) is re-defined as an area of dominantly Mesoarchean crust forming the northwestern part of the Rae craton. Four U-Pb zircon age determinations (ca. 3.3–2.97 Ga) extend QMb ∼40 km farther west than previously known to a major tectonic boundary marked by a >450 km-long belt of ca. 1.9 Ga peraluminous leucogranite in the Thelon tectonic zone. Crust older than 3.3 Ga is indicated by inherited zircon up to 3.95 Ga in one sample. The absence within QMb of 2.6 Ga plutonic rocks, a dominant component of the central Rae craton, suggests distinct Neoarchean tectonic histories and separation of these crustal blocks prior to accretion of ca. 2.56–2.51 Ga Boothia terrane, stitching by ca. 2.5 Ga Queen Maud granitoids and a shared post-2.5 Ga history.</div><div>Tonalite dated at 2.41 Ga in QMb and monzogranite dated at 2.34 Ga in the adjacent Thelon tectonic zone have geochemical characteristics of convergent plate margin magmatism (arc ± slab-failure). Similarity in the Nd isotopic compositions of 2.34 Ga Thelon monzogranite and ca. 2.3 Ga plutonic rocks in Buffalo Head terrane, as well as 2.07 Ga and 2.0 Ga plutonic rocks in both regions point to a similar Neoarchean basement component. This basement terrane is proposed to have collided with the Rae at ca. 2.41 Ga and driven ca. 2.4–2.3 Ga tectonometamorphism during the Arrowsmith Orogeny.</div><div>The western Rae represented a convergent margin at 2.41–2.3 Ga and potentially 2.6–2.5 Ga, the latter broadly synchronous with the MacQuoid orogeny on the southeastern Rae margin. Throughout this time period, the central Rae craton was in an upper-plate position. Sustained mantle downwelling driving plate convergence towards the central Rae craton, as previously recognized at 2.0–1.9 Ga, was maintained from the Neoarchean through multiple Paleoproterozic orogenies (Arrowsmith, Taltson-Thelon and Hudsonian), establishing the Rae craton as the nucleus of proto-Laurentia within the Nuna supercontinent.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107617"},"PeriodicalIF":3.2000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Isotopic constraints on the architecture and early (ca. 2.4–2.3 Ga) Paleoproterozoic evolution of the northwestern Rae craton, Canada\",\"authors\":\"R.G. Berman, W.J. Davis, M. Sanborn-Barrie\",\"doi\":\"10.1016/j.precamres.2024.107617\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Queen Maud block (QMb) is re-defined as an area of dominantly Mesoarchean crust forming the northwestern part of the Rae craton. Four U-Pb zircon age determinations (ca. 3.3–2.97 Ga) extend QMb ∼40 km farther west than previously known to a major tectonic boundary marked by a >450 km-long belt of ca. 1.9 Ga peraluminous leucogranite in the Thelon tectonic zone. Crust older than 3.3 Ga is indicated by inherited zircon up to 3.95 Ga in one sample. The absence within QMb of 2.6 Ga plutonic rocks, a dominant component of the central Rae craton, suggests distinct Neoarchean tectonic histories and separation of these crustal blocks prior to accretion of ca. 2.56–2.51 Ga Boothia terrane, stitching by ca. 2.5 Ga Queen Maud granitoids and a shared post-2.5 Ga history.</div><div>Tonalite dated at 2.41 Ga in QMb and monzogranite dated at 2.34 Ga in the adjacent Thelon tectonic zone have geochemical characteristics of convergent plate margin magmatism (arc ± slab-failure). Similarity in the Nd isotopic compositions of 2.34 Ga Thelon monzogranite and ca. 2.3 Ga plutonic rocks in Buffalo Head terrane, as well as 2.07 Ga and 2.0 Ga plutonic rocks in both regions point to a similar Neoarchean basement component. This basement terrane is proposed to have collided with the Rae at ca. 2.41 Ga and driven ca. 2.4–2.3 Ga tectonometamorphism during the Arrowsmith Orogeny.</div><div>The western Rae represented a convergent margin at 2.41–2.3 Ga and potentially 2.6–2.5 Ga, the latter broadly synchronous with the MacQuoid orogeny on the southeastern Rae margin. Throughout this time period, the central Rae craton was in an upper-plate position. Sustained mantle downwelling driving plate convergence towards the central Rae craton, as previously recognized at 2.0–1.9 Ga, was maintained from the Neoarchean through multiple Paleoproterozic orogenies (Arrowsmith, Taltson-Thelon and Hudsonian), establishing the Rae craton as the nucleus of proto-Laurentia within the Nuna supercontinent.</div></div>\",\"PeriodicalId\":49674,\"journal\":{\"name\":\"Precambrian Research\",\"volume\":\"417 \",\"pages\":\"Article 107617\"},\"PeriodicalIF\":3.2000,\"publicationDate\":\"2025-02-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Precambrian Research\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0301926824003309\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Precambrian Research","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301926824003309","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

摘要

莫德王后地块（QMb）被重新定义为Rae克拉通西北部以中太古代地壳为主的区域。四次U-Pb锆石年龄测定（约3.3-2.97 Ga）将QMb ~ 40 km向西延伸至主要构造边界，该构造边界以Thelon构造带约1.9 Ga过铝浅花岗岩带为标志，长450 km。其中一个样品的继承锆石最高可达3.95 Ga，表明地壳年龄大于3.3 Ga。作为Rae克拉通中心的主要组成部分，2.6 Ga深成岩在QMb内的缺失表明，在约2.56-2.51 Ga的Boothia地块增生之前，这些地壳块体经历了不同的新太古代构造历史和分离，由约2.5 Ga的Queen Maud花岗岩类拼接而成，并具有共同的2.5 Ga之后的历史。QMb地区2.41 Ga的闪长岩和相邻的Thelon构造带2.34 Ga的二长花岗岩具有辐合板块边缘岩浆作用（弧±板裂）的地球化学特征。布法罗头地体2.34 Ga塞隆二长花岗岩与约2.3 Ga深成岩，以及两地2.07 Ga和2.0 Ga深成岩的Nd同位素组成相似，表明它们具有相似的新太古代基底成分。该基底地体在约2.41 Ga与Rae碰撞，并在Arrowsmith造山运动中推动了约2.4-2.3 Ga的构造变质作用。西Rae在2.41 ~ 2.3 Ga和可能的2.6 ~ 2.5 Ga为辐合边缘，后者与Rae东南边缘的麦夸德造山活动大致同步。在这一时期，中央雷克拉通处于上板块位置。从新太古代开始，经过多次古元古代造山运动（Arrowsmith、Taltson-Thelon和Hudsonian），持续的地幔下涌推动板块向中央Rae克拉通收敛，使Rae克拉通成为Nuna超大陆内原laurentia的核心。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Isotopic constraints on the architecture and early (ca. 2.4–2.3 Ga) Paleoproterozoic evolution of the northwestern Rae craton, Canada

Queen Maud block (QMb) is re-defined as an area of dominantly Mesoarchean crust forming the northwestern part of the Rae craton. Four U-Pb zircon age determinations (ca. 3.3–2.97 Ga) extend QMb ∼40 km farther west than previously known to a major tectonic boundary marked by a >450 km-long belt of ca. 1.9 Ga peraluminous leucogranite in the Thelon tectonic zone. Crust older than 3.3 Ga is indicated by inherited zircon up to 3.95 Ga in one sample. The absence within QMb of 2.6 Ga plutonic rocks, a dominant component of the central Rae craton, suggests distinct Neoarchean tectonic histories and separation of these crustal blocks prior to accretion of ca. 2.56–2.51 Ga Boothia terrane, stitching by ca. 2.5 Ga Queen Maud granitoids and a shared post-2.5 Ga history.

Tonalite dated at 2.41 Ga in QMb and monzogranite dated at 2.34 Ga in the adjacent Thelon tectonic zone have geochemical characteristics of convergent plate margin magmatism (arc ± slab-failure). Similarity in the Nd isotopic compositions of 2.34 Ga Thelon monzogranite and ca. 2.3 Ga plutonic rocks in Buffalo Head terrane, as well as 2.07 Ga and 2.0 Ga plutonic rocks in both regions point to a similar Neoarchean basement component. This basement terrane is proposed to have collided with the Rae at ca. 2.41 Ga and driven ca. 2.4–2.3 Ga tectonometamorphism during the Arrowsmith Orogeny.

The western Rae represented a convergent margin at 2.41–2.3 Ga and potentially 2.6–2.5 Ga, the latter broadly synchronous with the MacQuoid orogeny on the southeastern Rae margin. Throughout this time period, the central Rae craton was in an upper-plate position. Sustained mantle downwelling driving plate convergence towards the central Rae craton, as previously recognized at 2.0–1.9 Ga, was maintained from the Neoarchean through multiple Paleoproterozic orogenies (Arrowsmith, Taltson-Thelon and Hudsonian), establishing the Rae craton as the nucleus of proto-Laurentia within the Nuna supercontinent.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.