Late-Holocene seasonal moisture variability: Range Creek Canyon, Utah, USA

Mariangelica Groves; Andrea R Brunelle; Mitchell J Power; Kenneth L Petersen; Zachary J Lundeen

摘要

A 3300 year-long reconstruction of paleoenvironmental moisture conditions was constructed from a sediment core from North Gate Bog (NGB) in the northern section of Range Creek Canyon within the Colorado Plateau. The methods used to analyze the record include loss on ignition (LOI), magnetic susceptibility (MS), elemental analysis with X-ray fluorescence (XRF), charcoal influx, isotopic analysis, elemental ratios and pollen percentages, influx, and ratios. This study adds two new insights to the paleoenvironmental record of the northern section of the Colorado Plateau. First, four climatic zones were established. Zone 1 (3300–2750 cal yr BP) had 100-year wet to dry variations with droughts recorded from 3300–3200, 3000–2900, and 2800–2700 cal yr BP. Zone 2 (2750–1600 cal yr BP) had an overall dry period with an 800-year transition to increased warmth and winter moisture. Zone 3 (1600–850 cal yr BP) had an overall warm, wet, summer precipitation climate conducive to the establishment of Zea Mays and Pinus edulis , two staple foods of the Fremont culture. The Medieval Climate Anomaly (MCA) registered warm and wet in this part of the Colorado Plateau. Zone 4 (850–0 cal yr BP) had a sharp transition to a drier climate from 850 to 400 cal yr BP. During the Little Ice Age (LIA), wetter climate taxon increases such as Artemisia, Cyperaceae, and Pinus edulis. The second overall finding in this study was that NGB was a place of human activity including Fremont farming. The identification of a Zea mays pollen grain confirms the archeological presumptions that this higher elevation site was used to farm corn along with other sites in Range Creek Canyon (RCC). The post Fremont occupation period was marked by a sharp increase in organic material and a return of pinyon-juniper woodlands.

机译：3300年长期重建古环境水分条件是由北门沼泽（NGB）的沉积物核心构建，在科罗拉多高原内的范围溪峡谷北部。用于分析记录的方法包括点火（LOI），磁化率（MS），元素分析，具有X射线荧光（XRF），木炭流入，同位素分析，元素比率和花粉百分比，流入和比率。本研究为科罗拉多高原北部的古环境记录增加了两个新的见解。首先，建立了四个气候区。区域1（3300-2750 Cal Yr BP）有100年潮湿的干燥变化，干旱从3300-3200,3000-2900和2800-2700 Cal YR BP中记录。 2区（2750-1600 Cal Yr BP）的整体干燥期，800年过渡到增加温暖和冬季水分。第3区（1600-850 Cal Yr BP）具有整体温暖，潮湿，夏季降水的气候，有助于建立Zea Mays和Pinus Edulis，弗里蒙特文化的两个主食。中世纪气候异常（MCA）在科罗拉多高原的这一部分注册了温暖潮湿。 4区（850-0 CAL YR BP）从850到400 CAL YR BP的干燥气候过度过渡。在小冰河时代（LIA）期间，湿润的气候分类增加，如艾蒿，Cyperaceae和Pinus Edulis。本研究中的第二个整体发现是，NGB是一个人类活动的地方，包括弗里蒙特养殖。 Zea 5月花粉晶粒的鉴定证实了这种较高的升高部位用于农场玉米和范围溪峡谷（RCC）的其他网站的考古推定。在弗里蒙特职业期间标志着有机物质的急剧增加和拼音 - 杜松林地的回归。

Late-Holocene seasonal moisture variability: Range Creek Canyon, Utah, USA

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