Hydrogen loss from pyroxene within granulite xenoliths at Damaping, North China craton

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Asian Earth Sciences Pub Date : 2024-09-16 DOI:10.1016/j.jseaes.2024.106331
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Abstract

The preservation of original water contents within nominally anhydrous minerals is essential for understanding the deep Earth’s water budget. Here we present a comprehensive analysis of mineral chemistry and Fourier transform infrared spectroscopy on 15 lower-crustal granulite xenoliths collected from Damaping in the North China craton. Our analyses reveal that the orthopyroxene grains from two samples exhibit hydrogen-deficient rims, suggestive of hydrogen loss. Drawing upon experimentally determined hydrogen diffusivity in pyroxene, we propose that clinopyroxene, despite the absence of evident hydrogen zoning, may have likewise undergone partial hydrogen depletion. Our findings call into question the conventional belief that hydrogen concentrations in pyroxene are faithful proxies for the original water content in the continental lower crust. We attribute the loss of hydrogen in pyroxene to magmatic outgassing, most likely occurring during the surface flow stage. Such a process could partially explain the relatively lower water contents documented in the granulite xenoliths when compared to those found in the Precambrian granulite terranes from the North China craton. Considering recent studies on mantle xenoliths, it becomes evident that both basalt-hosted mantle and lower-crustal xenoliths may have experienced partial loss of their original water contents within the deep Earth.

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华北克拉通大马坪花岗岩异岩石中辉石的氢损失
在名义上无水的矿物中保留原始含水量对于了解地球深部的水预算至关重要。在此,我们对从华北克拉通大马坪采集的 15 块低钙花岗岩异长岩进行了矿物化学和傅立叶变换红外光谱综合分析。我们的分析表明,两个样品中的正长石晶粒显示出缺氢边缘,表明存在氢损失。根据实验测定的辉石中的氢扩散率,我们提出,尽管辉石中没有明显的氢分带,但可能同样经历了部分氢耗竭。我们的研究结果对传统的看法提出了质疑,即辉石中的氢浓度是大陆下地壳中原有水含量的忠实代用指标。我们将辉石中氢的损失归因于岩浆放气,这很可能发生在地表流动阶段。这一过程可以部分解释与华北克拉通前寒武纪花岗岩岩体中的水含量相比,花岗岩异长岩中的水含量相对较低的原因。考虑到最近对地幔异长岩的研究,很明显,玄武岩包裹的地幔和低地壳异长岩在地球深部可能都经历了其原始含水量的部分损失。
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来源期刊
Journal of Asian Earth Sciences
Journal of Asian Earth Sciences 地学-地球科学综合
CiteScore
5.90
自引率
10.00%
发文量
324
审稿时长
71 days
期刊介绍: Journal of Asian Earth Sciences has an open access mirror journal Journal of Asian Earth Sciences: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The Journal of Asian Earth Sciences is an international interdisciplinary journal devoted to all aspects of research related to the solid Earth Sciences of Asia. The Journal publishes high quality, peer-reviewed scientific papers on the regional geology, tectonics, geochemistry and geophysics of Asia. It will be devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be included. Papers must have international appeal and should present work of more than local significance. The scope includes deep processes of the Asian continent and its adjacent oceans; seismology and earthquakes; orogeny, magmatism, metamorphism and volcanism; growth, deformation and destruction of the Asian crust; crust-mantle interaction; evolution of life (early life, biostratigraphy, biogeography and mass-extinction); fluids, fluxes and reservoirs of mineral and energy resources; surface processes (weathering, erosion, transport and deposition of sediments) and resulting geomorphology; and the response of the Earth to global climate change as viewed within the Asian continent and surrounding oceans.
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