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南黄海牡蛎壳元素组成的原位微区分析及环境指示
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南黄海牡蛎壳元素组成的原位微区分析及环境指示
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Journal Article
南黄海牡蛎壳元素组成的原位微区分析及环境指示
2020
Overview
碳酸盐生物壳体的周期性生长纹层是记录气候环境变化的天然材料。随着原位微区测试技术的快速发展，高分辨率的同位素和化学元素组成的快速分析显著推动了古气候环境变化及生物地球化学研究。应用激光剥蚀等离子体质谱仪（LA-ICP-MS）对南黄海现代牡蛎Crassostrea gigas壳体韧带部的元素组成进行原位微区测试，利用内标元素43Ca进行元素比值的校正，探讨了牡蛎壳中化学元素特征及其环境意义。研究的长牡蛎壳体中Mg/Ca、Sr/Ca、Na/Ca比值具有显著的季节性周期变化。环境水体物理化学性质的变化对壳体生长速率影响较大，壳中白垩质方解石和叶片方解石生长层分别对应较高和较低的环境温度，白垩方解石层具有较高的Mg/Ca、Sr/Ca和较低的Na/Ca比值。Mg/Ca比值可指示牡蛎壳体生长环境水体温度，利用前人Mg/Ca比值公式计算可以恢复与器测资料相符的近岸海水温度结果。本研究对应用LA-ICP-MS分析技术开展高分辨率的生物壳体元素组成和环境示踪研究具有借鉴意义。
