Middle - Late Eocene cold and wet climatic interval in East Asia: Evidence from lacustrine sediments of the lower Huoshaogou Formation in the Hexi Corridor, NE Tibetan Plateau

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Zixuan Wang , Shuang Dai , Tianqi Ji , Xiaojun Ma , Zhongzhao Ding , Zhaobin Zhang , Chunyan Li , Jiayi Xing
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Abstract

Knowledge of the climate of the Late Eocene is important for understanding the global climatic shift from a global Warmhouse to a Coolhouse. We obtained a climatic record for the interval of 38.10–36.33 Ma based on sedimentary facies analysis combined with measurements of color indices (CI) and magnetic susceptibility (MS) of the lower Huoshaogou Formation in the westernmost Hexi Corridor, Northeastern Tibetan Plateau. Our results reveal the following temporal sequence of sedimentary environments: delta plain, shore–shallow lake, deep lake, and braided river. The records of MS and CI co-vary with changes in sedimentary facies and color, respectively. The various proxy indicators indicate an overall warm and dry climate interrupted by a cold and wet interval in the middle part of the section during ∼37.67–36.44 Ma, corresponding to a thick, greenish-colored lacustrine sedimentary layer with high values of lightness and low valuer of MS, frequency-dependent MS and redness. We suggest that this event was driven by the diversion of westerly winds due to the uplift of the southern Tibetan Plateau, together with the Tethys Sea retreat and the short-lived emergence or enhancement of the Asian monsoon.
东亚中-晚始新世寒湿气候区:来自青藏高原东北部河西走廊火烧沟下统湖沼沉积物的证据
了解晚始新世的气候对于理解全球气候从 "暖温带 "向 "冷温带 "的转变非常重要。我们通过对青藏高原东北部河西走廊最西端的老虎沟地层下部进行沉积面分析,并结合色度指数(CI)和磁感应强度(MS)的测量,获得了38.10-36.33 Ma期间的气候记录。我们的研究结果揭示了以下沉积环境的时间序列:三角洲平原、滨浅湖、深湖和辫状河。MS和CI的记录分别与沉积面和颜色的变化共同变化。各种代用指标表明,在 37.67-36.44 Ma 期间,该剖面的中段出现了一个寒冷和潮湿的间歇期,与之相对应的是厚厚的绿色湖相沉积层,其亮度值较高,而 MS、频率相关的 MS 和红度值较低。我们认为,这一事件是由青藏高原南部隆升导致的西风转向、特提斯海退缩以及亚洲季风的短暂出现或增强所驱动的。
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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