Core Insights - The research team from the Guangzhou Institute of Geochemistry has identified the key factor controlling the extraordinary accumulation of rare earth elements (REEs) in carbonatite magma, which is the depth of intrusion [1][2] - The findings were published in the international journal "Nature Communications" on February 3, 2026, highlighting the significance of this research in understanding the distribution of carbonatite-type rare earth deposits globally [1][2] Group 1: Research Findings - The study reveals that less than 10% of carbonatite bodies form economically viable rare earth deposits, despite over half of the global rare earth reserves being sourced from carbonatites [1] - High-temperature and high-pressure experiments simulated the cooling crystallization process of carbonatite magma at depths of 6 to 20 kilometers, showing two distinct evolutionary paths based on pressure [1][2] Group 2: Mechanisms of REE Accumulation - At depths shallower than 10 kilometers (approximately 0.3 GPa), early crystallization of apatite occurs, which traps REEs in its structure, preventing their migration and accumulation [1][2] - In contrast, at depths greater than 10 kilometers, olivine crystallizes first, consuming silicon and preventing apatite from forming a "cage" for REEs, allowing for higher solubility of REEs in saline melts, which leads to the formation of economically valuable minerals [2] Group 3: Implications for Exploration - The research establishes a complete causal chain of "pressure—mineral crystallization sequence—melt properties—REE enrichment," enhancing the understanding of the mechanisms behind REE accumulation [2] - This study provides new insights for the exploration of carbonatite-type rare earth deposits, indicating that world-class deposits, such as those in China, are typically found at depths greater than 10 kilometers [2]

Core Viewpoint - The research team from the Guangzhou Institute of Geochemistry has identified the depth of carbonatite magma intrusion as a key factor controlling the extraordinary accumulation of rare earth elements (REEs) [1][2]. Group 1: Research Findings - The study published in the journal "Nature Communications" reveals that over half of the global rare earth reserves come from carbonatite, yet less than 10% of carbonatite bodies form economically viable rare earth deposits [1]. - High-temperature and high-pressure experiments simulated the cooling and crystallization process of carbonatite magma at depths of 6 to 20 kilometers, showing two distinct evolutionary paths based on pressure levels [1][2]. - At depths shallower than 10 kilometers (approximately 0.3 GPa), early crystallization of apatite occurs, which traps REEs in its structure, preventing their migration and accumulation [1][2]. Group 2: Implications for Rare Earth Deposits - At depths greater than 10 kilometers, olivine crystallizes first, consuming silicon and preventing apatite from forming a "cage" to lock in REEs, allowing for higher solubility of REEs in saline melts [2]. - The findings explain the distribution patterns of global carbonatite-type rare earth deposits, with world-class deposits like Baiyun Obo in China being located at depths greater than 10 kilometers [2]. - The research establishes a complete causal chain linking pressure, mineral crystallization sequence, melt properties, and REE enrichment, providing new insights for the exploration of carbonatite-type rare earth deposits [2].

Core Insights - Rare earth elements are essential strategic resources in high-tech fields such as artificial intelligence, renewable energy, and national defense, but traditional mining methods cause significant environmental damage [1][2] - A study published in the journal "Environmental Science & Technology" reveals that the plant "Osmunda japonica" can accumulate rare earth elements and form a mineral called "lanthanite," marking the first observation of biogenic mineralization of rare earths in natural plants [1][4] Group 1 - The research team discovered that "Osmunda japonica" acts as a "rare earth vacuum cleaner," efficiently absorbing and concentrating rare earth elements from the soil [1][4] - The process involves the precipitation of rare earth elements in the form of nanoparticles within the plant's vascular bundles and epidermal tissues, which then crystallize into phosphate rare earth minerals [1][4] - This mechanism serves as a protective strategy for the plant, effectively "packaging" toxic rare earth ions into mineral structures, thus detoxifying them [1][4] Group 2 - The biogenic lanthanite formed by "Osmunda japonica" is pure and free of radioactive elements, presenting a promising green extraction potential compared to traditional mining methods [2][4] - The study highlights the previously underestimated mineralization capabilities of plants, opening new avenues for research on nearly a thousand known hyperaccumulating plant species [4] - The findings suggest a sustainable approach to rare earth resource utilization, where planting hyperaccumulating species like "Osmunda japonica" can aid in soil remediation while recovering valuable rare earths, achieving a green circular economy [4]