泰国东南部尖竹汶府 Soi Dao 地区二叠纪层状燧石序列的放射虫年龄和地球化学特征

IF 0.7 Q4 PALEONTOLOGY
Waraphorn Phromsuwan , Yoshihito Kamata , Takuya Hayashi , Kei-ichi Kobayashi , Thasinee Charoentitirat , Katsumi Ueno , Apsorn Sardsud
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引用次数: 0

摘要

本文利用泰国东南部Chanthaburi地区Soi Dao二叠纪燧石岩和硅质泥岩的放射虫组合和地球化学特征,确定了这些岩石的年龄和沉积环境。在早亚塞利世至早卡比塔世、萨克玛丽安至罗迪亚世、卡比塔世至长兴世三个研究区均获得了保存较好的放射虫。考虑到岩石的岩相、年龄和化学成分,可以重建一个由玄武岩、放射虫层状燧石、硅质泥岩以及砂岩和泥岩交替形成的碎屑组成的初级地层。地球化学分析,特别是燧石和硅质泥岩的球粒陨石归一化稀土模式,显示ce负异常的程度逐渐变化,并向年轻层逐渐减弱。这一变化表明二叠系岩石沉积环境在初期受热液活动的影响较大,随着时间的推移,热液活动的影响逐渐减弱,而陆相碎屑的流入则增加。研究区发现的二叠系玄武岩、硅质泥岩伴生层状燧石岩在岩相和显微特征上与古特提斯层状燧石岩非常相似;但是,它们的沉积期要短得多,表明它们沉积在另一个大洋盆地(即弧后盆地)。化学成分也表明,随着时间的推移,热液活动的影响减弱,陆源碎屑的影响增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Radiolarian age and geochemical characteristics of the Permian bedded chert sequence in the Soi Dao area, Chanthaburi, Southeast of Thailand
Radiolarian assemblages and geochemistry from Permian chert and siliceous mudstone in the Soi Dao, Chanthaburi area of southeastern Thailand, are used here to determine the age and depositional environment of these rocks. Moderate-to-well preserved radiolarian were obtained from three study areas, from bedded cherts and siliceous mudstones of Early Asselian to Early Capitanian, Sakmarian to Roadian, and Capitanian to Changhsingian age. Considering the lithofacies, age, and chemical composition of the rocks, a primary stratigraphy can be reconstructed that consists, in ascending order, of basaltic rocks, radiolarian bedded cherts, siliceous mudstones, and clastics made of alternations of sandstone and mudstone. Geochemical analyses, particularly chondrite-normalized REEs patterns of chert and siliceous mudstone, show a gradual change in the degree of the Ce-negative anomaly, which decrease towards the younger strata. This change indicates that the depositional environment of the Permian rock was at the beginning highly influenced by hydrothermal activity, which decreased with time, while the influx of terrestrial clastics increased. Permian bedded cherts accompanied by basalts and siliceous mudstones recognized in the study area are very similar to the Paleo-Tethys bedded cherts in terms of their lithofacies and microscopic features; however, their depositional period is much shorter, indicating that they were deposited in another oceanic basin (i.e., a back-arc basin). The chemical composition also shows that the influence of hydrothermal activity weakened over time and the influence of terrigenous clastics increased.
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来源期刊
CiteScore
2.50
自引率
0.00%
发文量
17
期刊介绍: La Revue de micropaléontologie publie 4 fois par an des articles de intérêt international, consacrés à tous les aspects de la micropaléontologie. Les textes, en anglais ou en français, sont des articles originaux, des résultats de recherche, des synthèses et mises au point, des comptes rendus de réunions scientifiques et des analyses de ouvrages. La revue se veut résolument ouverte à tous les aspects de la micropaléontologie en accueillant des travaux traitant de la systématique des microfossiles (et de leurs équivalents actuels), des bactéries aux microrestes de vertébrés, et de toutes leurs applications en sciences biologiques et géologiques.
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