峨眉山玄武岩古土壤对罗平世晚期较冷的赤道气候的估计

IF 1.5 4区 地球科学 Q2 GEOLOGY
Journal of Geology Pub Date : 2021-12-07 DOI:10.1086/718351
Mao-Lan Zhang, Z. Gong, Yu Zhou, Yanmei Liu, Jun Li, Chengmin Huang
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引用次数: 2

摘要

在大火成岩省洪泛玄武岩上发育的古土壤为定量重建给定时期的陆地古气候提供了宝贵的机会。本文利用新建立的玄武岩土壤-气候函数,获得了罗平纪晚期(~ 253 Ma)峨眉山玄武岩喷发结束后的陆相古气候资料。所构建的关系是年平均气温为32.81e−0.4166X (R2=0.55,标准误差[SE]=4.6°C),年平均降水量为−875.5ln(X)+1792 (R2=0.69, SE=328 mm),其中X=SiO2/(Al2O3+Fe2O3) (Saf指数)。我们采集了峨眉山玄武岩末期发育的9个古土壤剖面样品,进行了野外观测、微形态、矿物组成和地球化学分析。在此基础上,重建了区域平均气温18.9°C±4.6°C,降水1546±328 mm。该地区的气候比相似纬度的现代赤道地区的气候要冷。热带气候下峨眉山玄武岩快速风化导致大气CO2浓度降低,可能是导致峨眉山玄武岩喷发结束后区域陆生古气候变冷的主要原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cooler Equatorial Climate in the Late Lopingian Estimated from Paleosols Developed on Emeishan Basalts
Paleosols that developed on large igneous province flood basalts provide a valuable opportunity to quantitatively reconstruct the terrestrial paleoclimate during a given period. This study uses a newly constructed basaltic soil–climate function to obtain terrestrial paleoclimatic data following the termination of the Emeishan basalt eruption in the late Lopingian (∼253 Ma). The constructed relationships are mean annual temperature of 32.81e−0.4166X (R2=0.55, standard error [SE]=4.6°C) and mean annual precipitation of −875.5ln(X)+1792 (R2=0.69, SE=328 mm), where X=SiO2/(Al2O3+Fe2O3) (the Saf index). We collected samples from nine paleosol profiles developed on the last-phase Emeishan basalts and conducted field observations as well as micromorphological, mineral composition, and geochemical analyses. On the basis of these paleosols, we reconstructed the regional mean temperature and precipitation to be 18.9°C±4.6°C and 1546±328 mm, respectively. The regional climate was cooler than those in modern equatorial regions of similar latitudes. The reduced CO2 concentration in the atmosphere resulting from rapid weathering of Emeishan basalts in a tropical climate could have played a dominant role in causing the regional cool terrestrial paleoclimate following the termination of the Emeishan basalt eruption.
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来源期刊
Journal of Geology
Journal of Geology 地学-地质学
CiteScore
3.50
自引率
5.60%
发文量
0
审稿时长
3 months
期刊介绍: One of the oldest journals in geology, The Journal of Geology has since 1893 promoted the systematic philosophical and fundamental study of geology. The Journal publishes original research across a broad range of subfields in geology, including geophysics, geochemistry, sedimentology, geomorphology, petrology, plate tectonics, volcanology, structural geology, mineralogy, and planetary sciences. Many of its articles have wide appeal for geologists, present research of topical relevance, and offer new geological insights through the application of innovative approaches and methods.
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