Rare earth element chemistry indicates chemical alteration of zircons during the evolution of weathe

• 作者: Ni Su Shouye Yang Wei Yue
• 学科: 地球科学
• 关键词: Weathering profile Rare earth elements Zircon
• 年，卷（期）: 2022,（3）
• 页码范围: 433-436
• 页数: 3页
• 语种: 英文
• DOI: 10.1007/s11631-017-0184-0

摘要

Although rare earth elements (REEs) in magmatic zircons have been widely used to identify the type and compositional evolution of host rocks, REE distribution patterns during the chemical alteration of zircons need clarification. We investigated REE characteristics in zircons with different degrees of chemical weathering through systematic observation of a granodiorite-weathering profile in southeast China. Despite the relatively stable provenance ages of the studied profile (zircon U-Pb are 95.2±4.8 Ma), the zircon REEs exhibited systematic differences in abundance and fractionation patterns from the bedrock to upper layers, e.g. ΣREE, (LREE/HREE)CN, and Ce/Ce*. This evidence suggests chemical alteration of zircons during intensive chemical weathering and an expected influence on REE variability in the weathered products due to the presence of REE-bearing minerals.