Isotopic and Petrographic Evidence as a Proxy in Paleoclimatic Reconstructions from Flowstones in Southern Spain
Isotopic and Petrographic Evidence as a Proxy in Paleoclimatic Reconstructions from Flowstones in Southern Spain作者机构：Instituto Andaluz de Ciencias de la Tierra CSIC-UGR Granada Spain Instituto Geológico y Minero de Españ a IGME Granada Spain Departamento de Ciencias de la Tierra Universidad de Zaragoza Zaragoza Spain Departamento de Geología Centro de Hidrogeología Universidad de Málaga Campus de Teatinos Málaga Spain School of Geography Earth and Environmental Sciences University of Birmingham Birmingham UK
出 版 物：《Open Journal of Geology》 (地质学期刊（英文）)
年 卷 期：2020年第10卷第6期
页 面：597-611页
学科分类：0202[经济学-应用经济学] 02[经济学] 020205[经济学-产业经济学]
主 题：Speleothems Flowstones Fabrics Isotopic Characterization Cave Paleoclimatic Changes
摘 要：Changes in the morphology and mineralogy of speleothems (flowstones) clearly respond to climate-related phenomena, such as drip rate variability and temperature-modulated cave ventilation. Detailed petrographic observations have been coupled with δ18O and δ13C values. Fabrics may show changes related to variations in supersaturation, drip rate or input of detrital particles or organic compounds. Fabrics formed under relatively constant and regular drips (columnar compact, open and elongated) show similar δ18O and δ13C values, which are more negative than those of micrite and microsparite. The combination of internal microstratigraphy studies and isotopic data (δ18O and δ13C) from two flowstones collected from two caves in the north of Almeria province (SE Spain), suggest a spectrum of environmental conditions ranging from wetter to drier periods. Both records constitute a very useful tool for screening and interpreting high-resolution paleoclimate reconstructions.
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