Paleolandscape evolution along the coasts of the Baixo Alentejo (Portugal) during the Quaternary

IF 1.9 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Quaternary International Pub Date : 2024-07-23 DOI:10.1016/j.quaint.2024.07.006

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Abstract

A detailed geomorphological mapping allowed to understand the complex relationships interplayed between local tectonics and sedimentation across the coastal area of the Baixo Alentejo (Portugal) all along the Quaternary. Different outcrops of coastal sediments between Sines and Vilanova de Milfontes permitted to reconstruct a general sequence of up to fifteen stair-cased marine terraces, while wide sequences of alluvial fans develop in the hinterland. The distinct geomorphological disposition of these alluvial fans together with the presence/absence of marine terraces, have allowed to define different phases of paleolandscape evolution based both in sea level changes and differential uplift. A dune system has been attributed to MIS 5e in basis of OSL, and ¹⁴C and U-series dating permitted the adscription of a beach unit to MIS 5. These data allowed to stablish the relative chronology of the entire marine terrace sequence and to determine the vertical movement rates along the studied coastal area. The results give values ranging from slight uplift (+0.015mm/a) to subtle subsidence (−0.030 mm/a), coinciding with other author's determinations.

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第四纪期间葡萄牙 Baixo Alentejo 海岸的古地貌演变

通过绘制详细的地貌图，可以了解葡萄牙 Baixo Alentejo 沿海地区第四纪以来当地构造与沉积之间的复杂关系。在 Sines 和 Vilanova de Milfontes 之间沿海沉积物的不同露头处，可以重建多达 15 个阶梯状海洋阶地的总体序列，而在腹地则形成了广泛的冲积扇序列。这些冲积扇独特的地貌布局以及海洋阶地的存在/不存在，使得人们可以根据海平面变化和不同的隆升来确定古地貌演变的不同阶段。这些数据有助于确定整个海洋阶地序列的相对年代学，并确定所研究沿海地区的垂直运动速率。结果得出的数值从轻微隆起（+0.015 毫米/年）到细微下沉（-0.030 毫米/年）不等，与其他作者的测定结果相吻合。

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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.