A zircon classification scheme for sedimentary provenance analysis using radiation damage
A zircon classification scheme for sedimentary provenance analysis using radiation damage
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DOI：
10.1002/gj.4751
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发表时间：
2023-04
影响因子：
1.8
通讯作者：
Guanzhong Shi;Chuanbo Shen;B. Wauschkuhn;B. Härtel;L. Ratschbacher;Bin Xia;Xiangying Ge;Xiaowei Zeng;Hongyang Fu
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作者：
Guanzhong Shi;Chuanbo Shen;B. Wauschkuhn;B. Härtel;L. Ratschbacher;Bin Xia;Xiangying Ge;Xiaowei Zeng;Hongyang Fu
碎屑单颗粒锆石U-Pb年代学是研究物源的有力工具，如果可以获得有关源岩的信息。本文提出了一种新的源岩分类工具，该工具使用碎屑锆石辐射损伤的退火程度;退火由v3[SiO 4]拉曼谱带在~1008 cm−1处的宽度（半峰全宽; FWHM）与计算的α剂量之间的关系表示。根据锆石的侵位过程和/或热历史，将其寄主岩石分为三类：火山岩和快速冷却的深成高级变质岩（1型）;含热液锆石的岩石（2型）;缓慢冷却的火成岩和变质岩（3型）。我们构建了一个朴素贝叶斯预测模型，通过训练它与已知类型的锆石的集合。未知的锆石被赋予了从特定的寄主岩石类型衍生的概率。在应用碎屑锆石U-Pb年代学的物源研究中，这种分类方案最好用作辅助工具。
Detrital single‐grain zircon U–Pb geochronology is a powerful tool for provenance studies if information on the source rocks is available. This paper proposes a new source‐rock classification tool that uses the degree of annealing of radiation damage in detrital zircon; the annealing is expressed by the relationship between the width (full‐width at half‐maximum; FWHM) of the v3[SiO4] Raman band at ~1008 cm−1 and the calculated α‐dose. The host rocks of the zircons are classified into three types according to their emplacement process and/or thermal history: volcanic and rapidly cooled plutonic and high‐grade metamorphic rocks (type 1); rocks with hydrothermal zircons (type 2); slowly cooled igneous and metamorphic rocks (type 3). We construct a naive Bayes prediction model by training it with a collection of zircons of known types. The unknown zircons are assigned a probability of derivation from a specific host‐rock type. This classification scheme is best used as an accessory tool in provenance studies that apply detrital zircon U–Pb geochronology.