Late Pennsylvanian Calcareous Paleosols from Central New Mexico: Implications for Paleoclimate

Q4 Earth and Planetary Sciences

New Mexico Geology Pub Date : 2021-01-01 DOI:10.58799/nmg-v43n1.3

S. Lucas, L. Tanner

{"title":"Late Pennsylvanian Calcareous Paleosols from Central New Mexico: Implications for Paleoclimate","authors":"S. Lucas, L. Tanner","doi":"10.58799/nmg-v43n1.3","DOIUrl":null,"url":null,"abstract":"We document calcareous paleosols from Upper Pennsylvanian (lower Virgilian) strata of the Burrego Member of the Atrasado Formation in the Cerros de Amado of Socorro County, New Mexico. The Burrego paleosols are an excellent example of a scarce, climate-sensitive lithology in the Pennsylvanian strata of New Mexico. These paleosols contain mostly stage II to III carbonate horizons, and their overall morphology suggests deposition and pedogenesis under subhumid, seasonally dry conditions. This conclusion is consistent with paleobotanical and other data that indicate such climate conditions were widespread on Late Pennsylvanian Pangea. The mean value of the oxygen-isotope ratios from Burrego paleosol carbonates compares well with the values from Virgilian paleosols of the San Juan, the eastern Midland and Chama basins of New Mexico-Texas, suggesting similar conditions of temperature and paleoprecipitation. Application of the diffusion-reaction model to the mean carbon-isotope composition of the carbonate suggests a paleo-pCO2 of approximately 400 ppmV, which is also consistent with estimates from correlative carbonate deposits that formed farther east in Late Pennsylvanian Pangea.","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"New Mexico Geology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.58799/nmg-v43n1.3","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}

引用次数: 2

Abstract

We document calcareous paleosols from Upper Pennsylvanian (lower Virgilian) strata of the Burrego Member of the Atrasado Formation in the Cerros de Amado of Socorro County, New Mexico. The Burrego paleosols are an excellent example of a scarce, climate-sensitive lithology in the Pennsylvanian strata of New Mexico. These paleosols contain mostly stage II to III carbonate horizons, and their overall morphology suggests deposition and pedogenesis under subhumid, seasonally dry conditions. This conclusion is consistent with paleobotanical and other data that indicate such climate conditions were widespread on Late Pennsylvanian Pangea. The mean value of the oxygen-isotope ratios from Burrego paleosol carbonates compares well with the values from Virgilian paleosols of the San Juan, the eastern Midland and Chama basins of New Mexico-Texas, suggesting similar conditions of temperature and paleoprecipitation. Application of the diffusion-reaction model to the mean carbon-isotope composition of the carbonate suggests a paleo-pCO2 of approximately 400 ppmV, which is also consistent with estimates from correlative carbonate deposits that formed farther east in Late Pennsylvanian Pangea.

查看原文本刊更多论文

新墨西哥州中部宾夕法尼亚晚期钙质古土壤:对古气候的影响

我们记录了新墨西哥州Socorro县Cerros de Amado的Atrasado组Burrego成员的上宾夕法尼亚(下弗吉尼亚)地层的钙质古土壤。Burrego古土壤是新墨西哥州宾夕法尼亚地层中稀缺的、对气候敏感的岩性的一个很好的例子。这些古土壤主要含有II至III期碳酸盐层，其整体形态表明在半湿润、季节性干燥的条件下沉积和成土。这一结论与古植物学和其他数据一致，表明这种气候条件在晚宾夕法尼亚泛大陆广泛存在。Burrego古土壤碳酸盐的氧同位素平均值与新墨西哥-德克萨斯州圣胡安盆地、东部米德兰盆地和Chama盆地的Virgilian古土壤的氧同位素平均值比较好，表明了相似的温度和古降水条件。将扩散反应模型应用于碳酸盐岩的平均碳同位素组成，表明其古pco2约为400 ppmV，这也与晚宾夕法尼亚盘古大陆形成的相关碳酸盐岩沉积的估计相一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

New Mexico Geology Earth and Planetary Sciences-Geology

CiteScore

0.60

自引率

0.00%

发文量

期刊介绍： New Mexico Geology is a quarterly, peer-reviewed journal available by subscription. Articles of original research are generally less than 10,000 words in length and pertain to the geology of New Mexico and neighboring states, primarily for an audience of professional geologists or those with an interest in the geologic story behind the landscape. The journal also publishes abstracts from regional meetings, theses, and dissertations (NM schools), descriptions of new publications, book reviews, and upcoming meetings. Research papers, short articles, and abstracts from selected back issues of New Mexico Geology are now available as free downloads in PDF format. Back issues are also available in hard copy for a nominal fee.