粘土矿物质的证据表明,在早期的鲁纪,冷热波动存在
Zhibo Zhang1, Jiaming Zhang2, Hengye Wei3
1College of Resources and Environment, Yili Normal University, Yining, Xinjiang, China.
PloS one
|October 29, 2025
概括
四川盆地的早期鲁纪时期的特点是干燥和寒冷的气候,在奥尔多维纪末期的大规模灭绝后,延迟了生物的恢复. 较温暖的条件后来促进了这种回收,页岩分析证明了这一点.
科学领域:
- 古气候学 古气候学
- 古生物学的古生物学
- 地质化学 地质化学
背景情况:
- 从奥尔多维纪晚期到 Early Silurian 的过渡对于理解地质进化和大规模灭绝后生物恢复至关重要.
- 在奥尔多维纪末期大规模灭绝之后,生物复苏的原因仍然是科学辩论的主题.
- 来自Longmaxi形成的黑色页岩提供了对灭绝后气候演变及其对生物恢复的影响的见解.
研究的目的:
- 分析四川盆地早期罗纪龙马西形成页岩的总有机碳 (TOC) 和粘土矿物组成.
- 为了重建龙马克西时代的古气候演变.
- 研究气候变化对奥尔多维纪末期大规模灭绝后生物恢复的影响.
主要方法:
- 从Longmaxi形成 (LMX Fm.) 的页岩样本中分析总有机碳 (TOC) 含量. 在"尤坎-6号井"里.
- 检查粘土矿物成分,包括化物,化物和混合层矿物质 (化物/化物,化物/化物).
- 基于粘土矿物质特征和比率 (例如,I/C, (S+I/S) / ((I+C)) 的古气候重建,与碳同位素趋势相关联.
主要成果:
- 龙马克西形成页岩中的TOC含量在底部最高,向上下降.
- 主要的粘土矿物包括化物,化物和混合层类型;高化物和蒙特莫里隆化物不存在.
- 古气候演变发生在三个阶段:第一阶段 (干湿,冷热节奏),第二阶段 (温暖和潮湿),第三阶段 (干燥和冷).
结论:
- 在四川盆地的早期鲁纪龙马西时代,环境主要是干燥和寒冷,与全球古气候趋势保持一致.
- 在最早的鲁纪,干燥和寒冷的气候条件延迟了希尔南特冰川之后的生物复苏.
- 生物的恢复始于在早期的西鲁纪时期相对变暖的时期,与改善的环境条件相关.
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