Creating Continents: Archean Cratons Tell the Story
Creating Continents: Archean Cratons Tell the Story
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创造大陆：太古代克拉通讲述故事
DOI：
10.1130/gsatg541a.1
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Carol Frost;P. Mueller;D. Mogk;Ronald Frost;D. Henry
中科院分区：
文献类型：
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作者：
Carol Frost;P. Mueller;D. Mogk;Ronald Frost;D. Henry
众所周知，地球历史的前20亿年（太古宙）的记录是不完整的，然而这个时代的地壳出现在每个大陆上。在这里，我们研究了位于美国落基山脉北部的怀俄明克拉通的太古代记录，这些记录既暴露良好，又容易接近。我们确定了太古宙大陆地壳形成的三个阶段，这些阶段在其他克拉通中也有记录。最年轻阶段的特征是各种各样的新太古代岩石组合，与现代板块构造过程产生的岩石组合难以区分。中期以长闪长岩-闪长岩-花岗闪长岩（TTG）组合为代表，涉及较老的基性地壳的部分熔融。这个古老的基性地壳没有保存下来，但可以从火成岩和碎屑锆石颗粒和同位素的信息中推断出来
The record of the first two billion years of Earth’s history (the Archean) is notoriously incomplete, yet crust of this age is present on every continent. Here we examine the Archean record of the Wyoming craton in the northern Rocky Mountains, USA, which is both well-exposed and readily accessible. We identify three stages of Archean continental crust formation that are also recorded in other cratons. The youngest stage is characterized by a variety of Neoarchean rock assemblages that are indistinguishable from those produced by modern plate-tectonic processes. The middle stage is typified by the trondhjemite-tonalite-granodiorite (TTG) association, which involved partial melting of older, mafic crust. This older mafic crust is not preserved but can be inferred from information in igneous and detrital zircon grains and isotopic