Geochemical and petrogenetic evolution of the basement rocks of the Ha’il terrane, Arabian Shield: A snapshot of the Gondwana assembly

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research Pub Date : 2025-09-14 DOI:10.1016/j.gr.2025.08.015

Om Prakash Pandey , Froukje M. van der Zwan , Ivana Zivadinovic , Murtadha Y. Al Malallah , Dewashish Upadhyay , Jyoti Chandra , Klaus Mezger

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Abstract

The Ha’il terrane is one of eight terranes that amalgamated in the Neoproterozoic to form the Arabian Shield during the protracted assembly of Gondwana. Large portions of the terrane are composed of plutonic rocks, but the timing and mechanisms of their formation remain poorly constrained. This study presents whole-rock major and trace element concentrations and zircon in-situ U-Pb-Hf isotope data for the Ha’il monzogranite (Dayra suite), Kilab monzogranite (Shuwayman suite), and the Ha’il diorite (enclaved within the Ha’il monzogranite) of the Ha’il terrane. The Ha’il diorite is highly metaluminous, shows I-type affinity, and was emplaced at 650 ± 3 Ma during syn-orogenic magmatism. The Ha’il monzogranite and Kilab monzogranite are transitional metaluminous-peralkaline and exhibit ferroan, A-type, and alkalic granite affinities. They were emplaced at 640 ± 3 Ma during post-orogenic magmatism. The initial Hf-isotope compositions of the Ha’il diorite (εHf_(t) = +7.9 to + 9.0), Ha’il monzogranite (εHf_(t) = +8.2 to + 11.1), and the Kilab monzogranite (εHf_(t) = +8.7 to + 9.8) suggest their origin by partial melting of isotopically similar and juvenile crustal sources. The crustal sources were derived from a depleted mantle approximately 1000 Myr ago, coinciding with the initial rifting that led to the opening of the Mozambique Ocean. Furthermore, this study captures a tectonomagmatic transition from compressional, syn-orogenic to extensional, post-orogenic magmatism in the Ha’il terrane at around 640 Ma.

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阿拉伯地盾哈伊勒地体基底岩石的地球化学和岩石成因演化：冈瓦纳组合的快照

哈伊尔地体是在新元古代冈瓦纳长时间聚集期间合并形成阿拉伯盾的八个地体之一。地体的很大一部分是由深成岩组成的，但它们形成的时间和机制仍然很不清楚。本文研究了哈伊勒地体的哈伊勒二长花岗岩（Dayra套件）、基拉布二长花岗岩（Shuwayman套件）和哈伊勒闪长岩（包裹在哈伊勒二长花岗岩内）的全岩主微量元素浓度和锆石原位U-Pb-Hf同位素数据。哈伊勒闪长岩为高铝质闪长岩，具i型亲和，位在同造山岩浆作用时期的650±3 Ma。哈伊尔二长花岗岩和吉拉布二长花岗岩为过渡性过碱性金属花岗岩，具有铁铁矿、a型和碱性花岗岩的亲缘关系。它们位于造山后岩浆活动时期的640±3 Ma。哈伊勒闪长岩（εHf(t) = +7.9 ~ + 9.0）、哈伊勒二长花岗岩（εHf(t) = +8.2 ~ + 11.1）和吉拉布二长花岗岩（εHf(t) = +8.7 ~ + 9.8）的hf同位素初始组成表明，它们是由同位素相似的幼小地壳源部分熔融形成的。地壳源来自于大约1000 Myr前的枯竭地幔，与导致莫桑比克大洋开放的初始裂谷相吻合。此外，本研究还捕捉到了哈伊勒地体在640 Ma左右从挤压、同造山活动到伸展、后造山活动的构造岩浆活动转变。

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来源期刊

Gondwana Research 地学-地球科学综合

CiteScore

12.90

自引率

6.60%

发文量

298

审稿时长

65 days

期刊介绍： Gondwana Research (GR) is an International Journal aimed to promote high quality research publications on all topics related to solid Earth, particularly with reference to the origin and evolution of continents, continental assemblies and their resources. GR is an "all earth science" journal with no restrictions on geological time, terrane or theme and covers a wide spectrum of topics in geosciences such as geology, geomorphology, palaeontology, structure, petrology, geochemistry, stable isotopes, geochronology, economic geology, exploration geology, engineering geology, geophysics, and environmental geology among other themes, and provides an appropriate forum to integrate studies from different disciplines and different terrains. In addition to regular articles and thematic issues, the journal invites high profile state-of-the-art reviews on thrust area topics for its column, ''GR FOCUS''. Focus articles include short biographies and photographs of the authors. Short articles (within ten printed pages) for rapid publication reporting important discoveries or innovative models of global interest will be considered under the category ''GR LETTERS''.