追溯第勒尼安海北部海岸(意大利托斯卡纳科尼亚和佩科拉沿海平原)全新世古环境变化:地球化学和沉积学代用指标数据

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
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引用次数: 0

摘要

本文介绍并讨论了来自六个岩心的沉积学和地球化学数据,以便更好地了解佩科拉河和科尼亚河沿海平原(意大利托斯卡纳南部)全新世古环境演变的情况。总体而言,地层学显示,与海洋相连或部分相连的泻湖环境(低 Zr/Rb,高导电率值)沉积演替呈总体上升趋势(低导电率值),沼泽环境(锰/钛,高总有机碳值)向海演替,最后受径流现象或局部停滞水的影响,远端冲积平原(高 Zr/Rb,低导电率值)向大陆环境演替。这一趋势与水土流失过程,特别是近两个世纪以来的填海造地工程造成的内陆沉积物输入量增加密切相关。在科尼亚沿海平原,年代学研究表明,泻湖环境在约公元前 8.2 千年之前就已存在,并开始重新形成。在科尼亚沿岸平原,年代学表明,泻湖环境在公元前约 8.2 卡以前就已存在,并在公元前约 3.7 卡开始向海退缩。另一方面,从约公元前 0.5 千年到约公元 0.6 千年的年表显示,只有在非常接近历史地图中已确定为泻湖环境的地区,泻湖环境才持续存在。在佩科拉沿海平原,年代学显示,泻湖环境在约公元前 3.3 千年之前就已经消失了。公元前 3.3 千年前,泻湖环境已经消失,而周边环境的特点是植被丰富。公元前 3.3 千年前,泻湖环境已经消失,而外围环境的特点是植被丰富,后 者逐渐退化,形成了从浅到很深的无植被沼泽地,一直持续到公元 1 千年左右。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tracing holocene paleoenvironmental changes along the northern Tyrrhenian coast (Cornia and Pecora coastal plains, Tuscany, Italy): data from geochemical and sedimentological proxies

In this paper, sedimentological and geochemical data from six cores are presented and discussed in order to better understand the Holocene palaeoenvironmental evolution of the coastal plains of the Pecora and Cornia Rivers (southern Tuscany, Italy). Overall, the stratigraphies show a general upward trend in the evolution of the sedimentary succession of lagoonal environments (low Zr/Rb, high EC values) connected or partially connected to the sea (low EC values), to a seaward progradation of marshy-swampy environments (Mn/Ti, high TOC values) and finally to continental environments with the progradation of distal alluvial plains (high Zr/Rb, low EC values) influenced by runoff phenomena or local water stagnation. This trend is closely related to the increasing input of sediments from inland due to soil erosion processes and, especially in the last two centuries, land reclamation works. In the Cornia coastal plain, the chronologies indicate that lagoonal environments were already present before ca. 8.2ka BC and started receding seaward at around 3.7ka BC. On the other hand, chronologies from ca. 0.5ka BC to ca. 0.6ka AD point to a persistence of lagoonal environments only in areas very close to those already identified as such in historical cartography. In the Pecora coastal plain, the chronologies show that the lagoon environments had already disappeared before ca. 3.3ka BC, whilst the peripheral environments were characterised by abundant vegetation. The latter gradually degraded in favour of the development of shallow to very deep, unvegetated marshlands, which persisted until ca. 1ka AD.

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来源期刊
Quaternary International
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.
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