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The previously missing c. 2.9 Ga high‐K continental crust in West Gondwana revealed in Northeast Brazil
Terra Nova ( IF 2.4 ) Pub Date : 2020-10-24 , DOI: 10.1111/ter.12504
Alanielson C. D. Ferreira 1 , Elton L. Dantas 1 , Reinhardt A. Fuck 1
Affiliation  

2.9 Ga is an uncommon magmatic age in Archean evolution worldwide, especially in West Gondwana. We identified so far unknown 2.97–2.92 Ga high‐K calc‐alkaline magmatism in the Borborema Province, northeast Brazil. It appears to indicate that the transition to high‐K magmas occurred before c. 2.7 Ga in Earth's history. The 2.9 Ga protoliths were reworked and progressively changed composition to 2.65 Ga and 2.25 Ga higher‐K granites in early magmatic arcs. Therefore, despite several reworking events from the Archean to Proterozoic times, these rare relicts of K‐rich magmatism indicate that reworking of felsic components was significant for the growth and differentiation of continental crust from c. 2.9 Ga onwards in West Gondwana.

中文翻译:

先前失踪的c。巴西东北部发现西贡多瓦纳的2.9 Ga高K大陆壳

2.9 Ga是全世界太古宙演化中罕见的岩浆时代,尤其是在西冈瓦纳。我们在巴西东北部的Borborema省发现了迄今未知的2.97–2.92 Ga高钾钙碱性岩浆。似乎表明向高K岩浆的过渡发生在c之前。地球历史上的2.7 Ga。在早期的岩浆弧中,对2.9 Ga的原岩进行了重新加工,并将其组成逐渐更改为2.65 Ga和2.25 Ga高K花岗岩。因此,尽管从太古代到元古代发生了几次返修事件,但这些富含钾的岩浆作用的罕见遗迹表明,长英质组分的返修对于大陆壳与c的生长和分化具有重要意义。2.9西贡多瓦纳的Ga开始。
更新日期:2020-10-24
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