近日，中国地震局地质研究所张斌团队研究了蓬莱锆石：裂变径迹定年的潜在锆石参考物质。相关论文于2025年7月15日发表在《中国科学：地球科学》杂志上。

为了评价蓬莱锆石作为锆石裂变径迹热年代学参考物质的适用性，研究组对海南岛北部蓬莱地区的天然锆石巨晶进行了分析，并采用LA-ICP-MS法进行了裂变径迹定年。通过对国际公认的鱼峡谷凝灰岩锆石（FCT）标准的严格验证，研究组证明了他们实验室用LA-ICP-MS方法进行裂变径迹测年的测量过程是可靠和实用的。蓬莱3块锆石巨晶的52个碎片中获得的三个裂变径迹年龄分别为4.02±0.23Ma (1σ), 4.11±0.26Ma （1σ）和4.16±0.27Ma （1σ）。

得到的裂变径迹年龄均匀，可重复性高，与(U-Th)/He年龄一致。CL、BSE成像和EPMA分析结果表明，蓬莱3个锆石巨晶的化学和结构特征基本一致。蓬莱锆石巨晶具有近均匀性、弱宽分带、数量无限量、冷却快、裂变径迹年龄一致、(U-Th)/He年龄相同等特点。这些结果证实了蓬莱锆石适合作为主题的裂变径迹热年代学参考材料，但在选择蓬莱锆石巨晶作为参考材料前需谨慎验证裂变径迹年龄。

附：英文原文

Title: Penglai zircon: A potential zircon reference material for fission track dating

Author: Jing YANG, Jianzhang PANG, Murat Taner TAMER, Zhao YANG, Wei SHI, Sen WANG, Shuanhong ZHANG, Li YANG, Bin ZHANG

Issue&Volume: 2025/07/15

Abstract: To evaluate the suitability of Penglai zircon as a reference material for zircon fission track thermochronology, we analyzed natural zircon megacrysts from Penglai, northern Hainan Island, southern China, using the fission track dating by LA-ICP-MS method. Through rigorous validation against the internationally recognized Fish Canyon Tuff zircon (FCT) standards, we demonstrate that our laboratory’s measurement processes for fission track dating by the LA-ICP-MS method are reliable and practical. Three fission track ages of 4.02±0.23Ma (1σ), 4.11±0.26Ma (1σ), and 4.16±0.27Ma (1σ) were obtained from 52 fragments of three Penglai zircon megacrysts. The obtained fission track ages are homogeneous and highly reproducible, aligning with the (U-Th)/He ages. The chemical and textural analyses described by the CL and BSE imaging and EPMA results indicate that the three Penglai zircon megacrysts are nearly homogeneous. Penglai zircon megacrysts exhibit near homogeneity, weak broad zoning, unlimited quantity, rapid cooling, consistent fission track ages, and identical (U-Th)/He ages. These results confirm that Penglai zircon is suitable for use as a reference material for fission track thermochronology, provided that some caution is taken to verify fission track ages before selecting a Penglai zircon megacryst as a reference material.

DOI: 10.1007/s11430-025-1610-8

Source: https://www.sciengine.com/SCES/doi/10.1007/s11430-025-1610-8