Climatic and tectonic settings as a driver of late Quaternary landscape in the Southern Espinhaço range lowlands, Minas Gerais (Brazil)

IF 2.2 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Quaternary International Pub Date : 2025-12-01 Epub Date: 2025-10-23 DOI:10.1016/j.quaint.2025.110006

Mateus F. Cagnin , Fabiano T. da Conceição , Claudio E. Lana , Vinicius B. Moreira

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Abstract

Climatic changes and tectonic events play an important role into the denudational and sedimentation processes. The Southern Espinhaço Range (SER) is an important N-S continental elevate terranes in the state of Minas Gerais, Southeastern Brazil. The SER is primarily composed for Paleo-Mesoproterozoic quartzites, with Neoproterozoic pelites and carbonates. At the moment, only one study considered the unconsolidated sediments in the SER highlands (fluvial terraces and alluvial plains) were carried out. Here, four unconsolidated sediment profiles associated to alluvial fan system dominated by gravity flows (D1), fluvial terraces (D2 and D4) and lacustrine environment (D3) in the SER lowlands were studied, using sedimentary facies, chemical weathering indexes, and Single-Aliquot Regenerative Optically Stimulated Luminescence technique (SAR OSL). The main chemical weathering reactions in the fresh rocks were silicate incongruent dissolution (muscovite and biotite) and partial hydrolyses of microcline and albite forming kaolinite and illite, with quartz being unweathered. The unconsolidated sediments have high maturity, being originated under intense weathering conditions, with warm and humid climate. OSL ages in the SER lowlands varying from 47.45 ± 3.68 ka to 1.92 ± 0.15 ka, revealing old ages in relation to samples dated in the SER highlands (from 26.35 ± 4.47 ka to 0.18 ± 0.04 ka). These sedimentary profiles were deposit under a mix of paleoclimatic context, prevailing dry climate between ∼50 and ∼29.5 ka and ∼7 and ∼3 ka, and wet conditions from ∼29.5 to 7 ka and <3.1 ka. Fluvial incision at D2 and D4 and the presence of lacustrine environment elevated 30 m above the current base level, as well as the presence of faults that displace blocks in sedimentary profiles, indicated the importance role of |tectonic in the study area. Thus, climate changes and tectonic events control the landscape evolution in SER.

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巴西米纳斯吉拉斯州南部埃斯帕拉索山脉低地晚第四纪景观的气候和构造背景

气候变化和构造事件在剥蚀和沉积过程中起着重要作用。南埃斯帕拉索山脉（SER）是巴西东南部米纳斯吉拉斯州一条重要的南北大陆隆起地。SER主要由古中元古代石英岩组成，并伴有新元古代泥岩和碳酸盐岩。目前，仅对SER高原（河流阶地和冲积平原）的松散沉积物进行了研究。利用沉积相、化学风化指标和SAR OSL技术，研究了SER低地以重力流（D1）、河流阶地（D2和D4）和湖泊环境（D3）为主导的冲积扇体系的4条松散沉积剖面。新鲜岩石的化学风化反应主要为硅酸盐不均匀溶蚀（白云母和黑云母）和微斜长石和钠长石的部分水解形成高岭石和伊利石，石英未风化。松散沉积物成熟度高，形成于强烈的风化条件下，气候温暖湿润。SER低地的OSL年龄从47.45±3.68 ka到1.92±0.15 ka不等，与SER高原样品的年龄（26.35±4.47 ka到0.18±0.04 ka）有关。这些沉积剖面是在混合的古气候背景下沉积的，在~ 50 ~ ~ 29.5 ka和~ 7 ~ ~ 3 ka期间普遍的干燥气候，以及在~ 29.5 ~ 7 ka和<；3.1 ka期间的潮湿条件。D2和D4的河流切割和湖泊环境的存在比当前基准面高出30 m，以及沉积剖面中断层置换块体的存在，表明了|构造在研究区内的重要作用。因此，气候变化和构造事件控制着SER的景观演变。

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来源期刊

Quaternary International 地学-地球科学综合

CiteScore

5.60

自引率

4.50%

发文量

336

审稿时长

3 months

期刊介绍： Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.