The early Holocene humid period in NW Saudi Arabia - Sediments, microfossils and palaeo-hydrological modelling
The early Holocene humid period in NW Saudi Arabia - Sediments, microfossils and palaeo-hydrological modelling
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DOI：
10.1016/j.quaint.2011.04.028
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发表时间：
2012-07-17
影响因子：
2.2
通讯作者：
Frenzel, Peter
中科院分区：
文献类型：
--
作者：
Engel, Max;Brueckner, Helmut;Frenzel, Peter
从撒哈拉和阿拉伯半岛的各种地质生物档案中，包括萨布哈、古湖泊、沙丘、干河谷、洞穴积土或海洋沉积物，可以推断出全新世早期至中期的湿润时期。在阿拉伯半岛，这些记录大多位于南部和东南部。从北方的研究是罕见的。本文介绍了沙特阿拉伯西北部塔伊马绿洲萨布哈盆地的古环境和水文调查的第一批结果。沉积特征、微型和大型动物、基于差分全球定位系统测量的数字高程模型以及C-14-AMS数据表明，在10，000 - 9，000 cal BP之间存在一个最小深度为13米、储水量为1.16 x 107米3、水面为18.45平方公里的常年湖泊。有孔虫测试畸形和介形虫阀筛孔的形状被用来检测在古盐度和生态胁迫条件下的趋势。重建的至少在8500 cal BP之后的湖泊逐渐收缩反映了早全新世以来阿拉伯半岛的长期干旱化趋势。根据水文水量平衡方程，定量计算了全新世早期湿润期最小古降雨量。该方程的输入参数是最低湖平面，湖面，湖泊体积在全新世早期湿润期的高峰期，以及古蒸散，地下水入渗，地表径流。因此，现代萨布哈内陆盆地中的一个常年湖泊，其湖平面与最高海岸线存款的高程相同，需要的最低年降水量为150 +/- 25 mm。最近降水率的300%。(C)2011 Elsevier Ltd和INQUA。All rights reserved.
An early to mid-Holocene humid period has been inferred from a variety of geo-bio-archives of the Sahara and the Arabian Peninsula including sabkhas, palaeo-lakes, sand dunes, wadis, speleothems or marine sediments. On the Arabian Peninsula, most of these records are located in the southern and southeastern part. Studies from the northern part are rare. This paper presents the first results from palaeo-environmental and hydrological investigations on the sabkha basin of the Tayma oasis, north-western Saudi Arabia. Sedimentary characteristics, micro- and macrofauna, a digital elevation model based on DGPS measurements, and C-14-AMS data indicate the presence of a perennial lake with a minimum depth of 13 m, a stored water volume of 1.16 x 10(7) m(3) and a surface of 18.45 km(2) between 10,000-9000 cal BP. Foraminiferal test malformations and the shape of sieve pores on ostracod valves were used to detect trends in palaeo-salinity and ecological stress conditions. The reconstructed gradual contraction of the lake at least after 8500 cal BP reflects the long-term aridisation trend on the Arabian Peninsula after the early Holocene. Based on the hydrological water balance equation, quantitative data on minimum palaeo-rainfall during the early Holocene humid period were calculated. Input parameters for the equation are the minimum lake level, lake surface, and lake volume during the peak of the early Holocene humid period as well as palaeo-evapotranspiration, groundwater infiltration, and surface runoff. Accordingly, a perennial lake in the endorheic basin of the modern sabkha with a lake level at the same elevation as the uppermost shoreline deposit would have required a minimum annual precipitation of 150 +/- 25 mm. This value amounts to c. 300% of recent precipitation rates. (C) 2011 Elsevier Ltd and INQUA. All rights reserved.