Structural Stability of Natural Magnesiochromite at High-Temperature-Pressure Conditions

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Shuyu Jin, Xiang Wu, Yungui Liu, Yanfei Zhang, Chao Wang
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引用次数: 0

Abstract

The podiform chromitites in the Luobusha ophiolite have been thought to experience a very deep formation, but the maximum depth is still an open issue. Here, we have investigated the structural stability of natural magnesiochromite using the synchrotron-based powder X-ray diffraction and diamond anvil cells up to 48.6 GPa and 2 450 K. The results have shown that spinel-type magnesiochromite first decomposes into corundum-type ‘Cr2O3’ + B1-type ‘MgO’ at 11–14 GPa and 1 250–1 450 K, then modified ludwigite (mLd)-type ‘Mg2Cr2O5’ + corundum-type ‘Cr2O3’ at 14.3–20.5 GPa and 1 300–2 000 K, and finally CaTi2O4-type phase at 24.5 GPa. During the quenching procession from high-temperature-pressure conditions, the mLd-type phase appeared again and was kept at ambient conditions. We also obtained the isothermal equation states of spinel-type and CaTi2O4-type phases, revealing the composition effect on their elasticities. Based on the updated results, we propose chromitites could not experience pressure exceeding ∼14.3 GPa (approximate maximum depth ∼400 km) in the subduction-recycling genesis model.

天然镁铬铁矿在高温高压条件下的结构稳定性
人们一直认为罗布莎蛇绿岩中的荚状铬铁矿的形成深度很深,但其最大深度仍是一个未决问题。在此,我们利用同步辐射粉末 X 射线衍射和金刚石砧室研究了天然菱镁铬铁矿在 48.6 GPa 和 2 450 K 下的结构稳定性。结果表明,尖晶石型菱镁铬铁矿在 11-14 GPa 和 1 250-1 450 K 下首先分解为刚玉型 "Cr2O3"+B1 型 "MgO",然后在 14.3-20.5 GPa 和 1 300-2 000 K 下分解为改性鲁德维希特(MLd)型 "Mg2Cr2O5"+刚玉型 "Cr2O3",最后在 24.5 GPa 下分解为钙钛矿(CaTi2O4)型相。在从高温高压条件下淬火的过程中,又出现了 mLd 型相,并保持在环境条件下。我们还获得了尖晶石型和 CaTi2O4 型相的等温方程态,揭示了成分对其弹性的影响。根据更新的结果,我们提出铬铁矿在俯冲-循环成因模型中不可能经历超过 ∼14.3 GPa 的压力(大约最大深度 ∼400 km)。
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来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
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