Barium content of Archaean continental crust reveals the onset of subduction was not global.
Barium content of Archaean continental crust reveals the onset of subduction was not global.
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太古宙大陆地壳的钡含量表明俯冲的开始不是全球性的
DOI：
10.1038/s41467-022-34343-0
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发表时间：
2022-11-02
影响因子：
16.6
通讯作者：
Guo, Jinghui
中科院分区：
文献类型：
--
作者：
Huang, Guangyu;Mitchell, Ross N.;Palin, Richard M.;Spencer, Christopher J.;Guo, Jinghui
地球最早的大陆地壳主要由英云闪长岩-奥长花岗岩-花岗闪长岩（TTG）系列组成，这些岩石是解开大洋年代（40 - 25亿年前[Ga]）全球地球动力学机制的关键。TTG岩浆活动的构造背景是有争议的，有假说认为俯冲和反对。在这里，我们进行岩石学建模的压力-温度条件的范围内相关的西太平洋地热梯度。利用平均富集的玄武质源区成分，我们预测了TTG套中Ba的浓度，这是很难增加后，岩浆在源。结果表明，只有对应于热俯冲带的低地热梯度才产生富Ba的TTG，因此Ba代表了俯冲开始的代理。然后，我们确定统计上显着增加的TTG套房全球记录的穿时开始俯冲从区域在4 Ga全球完成后的某个时候，2.7 Ga的Ba含量。只有俯冲带才能产生富Ba TTG，代表俯冲开始的代理。Ba含量的统计增加揭示了从4Ga的区域俯冲到2.7Ga后的全球完全俯冲的历时性开始
Earth’s earliest continental crust is dominated by tonalite–trondhjemite–granodiorite (TTG) suites, making these rocks key to unlocking the global geodynamic regime operating during the Archaean (4.0–2.5 billion years ago [Ga]). The tectonic setting of TTG magmatism is controversial, with hypotheses arguing both for and against subduction. Here we conduct petrological modeling over a range of pressure–temperature conditions relevant to the Archaean geothermal gradient. Using an average enriched Archaean basaltic source composition, we predict Ba concentrations in TTG suites, which is difficult to increase after magma generated in the source. The results indicate only low geothermal gradients corresponding to hot subduction zones produce Ba-rich TTG, thus Ba represents a proxy for the onset of subduction. We then identify statistically significant increases in the Ba contents of TTG suites worldwide as recording the diachronous onset of subduction from regional at 4 Ga to globally complete sometime after 2.7 Ga. Only subduction zone can produce Ba-rich TTG, representing a proxy for the onset of subduction. Statistical increases in Ba contents of Archaean TTGs reveal the diachronous onset of subduction from regional at 4 Ga to globally complete after 2.7 Ga
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影响因子：
3.9
作者：
Boehnke, Patrick;Watson, E. Bruce;Schmitt, Axel K.
通讯作者：
Schmitt, Axel K.
影响因子：
56.9
作者：
Chen, Chin-Wu;Rondenay, Stephane;Snyder, David B.
通讯作者：
Snyder, David B.
DOI：
10.1007/978-94-007-7615-9_7
发表时间：
2014-01-01
期刊：
EVOLUTION OF ARCHEAN CRUST AND EARLY LIFE
影响因子：
--
作者：
Condie, Kent C.
通讯作者：
Condie, Kent C.
影响因子：
5.3
作者：
Johnson, I. E.;Kirkland, C. L.;Santosh, M.
通讯作者：
Santosh, M.
影响因子：
56.9
作者：
Dhuime, Bruno;Hawkesworth, Chris J.;Storey, Craig D.
通讯作者：
Storey, Craig D.