Palaeoenvironmental inferences from late Quaternary sediments of the Al Jafr Basin, Jordan
Palaeoenvironmental inferences from late Quaternary sediments of the Al Jafr Basin, Jordan
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约旦贾菲尔盆地晚第四纪沉积物的古环境推论
DOI：
10.1016/j.quaint.2014.12.041
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发表时间：
2015
影响因子：
2.2
通讯作者：
Al Saqarat
中科院分区：
文献类型：
--
作者：
Mischke;Al Saqarat
对内流贾夫尔盆地的沉积物进行了沉积学、古生物学和矿物学分析，以更好地了解第四纪晚期约旦高原南部的沉积和水文条件。盆地西部地表暴露的富含碳酸盐的沉积物含有介形类（微型甲壳类）壳，包括 Ilyocypriscf.bradyi、Candonaignorea、Heterocyprissalina、Fabaeformiscandona fabaeformis、Pseudocandonasp。和短尾疱疹。这些和其他更稀有物种的贝壳以及轮藻和软体动物遗骸表明，沉积物是在浅淡水到微盐度池塘、溪流和沼泽的湿地环境中形成的。目前一些记录的类群分布在更北的地区，这表明湿地形成期间的气候条件可能较凉爽。两个地点的生物碳酸盐的放射性碳年龄数据表明，湿地环境存在于海洋同位素阶段 (MIS) 3 的后半段或更早的时期。在湿地形成期间，流域内必定存在明显较高的地下水位；推断该流域或至少其最高和最潮湿的最西部地区气候条件较湿润。自 MIS 2 以来，该地区显然普遍存在由风引起的通货紧缩和局部沉积物堆积以及偶尔的冲刷事件。我们新提供的数据和推论不支持重建先前报道的 Al Jafr 盆地较大且相对较深的更新世湖泊。然而，对约旦南部第四纪水文条件的详细评估肯定需要更广泛的研究。
Sedimentological, palaeontological and mineralogical analyses of sediments from the endorheic Al Jafr Basin were conducted to better understand the depositional and hydrological conditions on the southern Jordan Plateau in the late Quaternary. Surficially exposed carbonate-rich sediments in the western part of the basin contain ostracod (micro-crustacean) shells ofIlyocypriscf.bradyi,Candona neglecta,Heterocypris salina,Fabaeformiscandona fabaeformis,Pseudocandonasp. andHerpetocypris brevicaudata. The shells of these and other more rare species, and charophyte and mollusc remains indicate that the sediments were formed in a wetland setting of shallow freshwater to slightly oligohaline ponds, streams and swamps. The present more northern distribution of some of the recorded taxa implies that climate conditions were probably cooler during the wetland formation. Radiocarbon age data for biogenic carbonate from two locations suggest that the wetland setting existed during the second half of Marine Isotope Stage (MIS) 3 or possibly earlier. A significantly higher water table must have existed in the basin during wetland formation; and wetter climate conditions are inferred for the catchment or at least for its highest and most humid westernmost part. Deflation and local sediment accumulation by wind and occasional sheet-wash events apparently prevailed in the region since MIS 2. Our newly presented data and inferences do not support the reconstruction of a previously reported large and relatively deep Pleistocene lake in the Al Jafr Basin. However, more extensive studies are certainly required for a detailed assessment of the Quaternary hydrological conditions in southern Jordan.
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DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
M. Bar
通讯作者：
M. Bar
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
W. Bajjali;Nizar Abu
通讯作者：
Nizar Abu
DOI：
--
发表时间：
1986
期刊：
影响因子：
--
作者：
P. Goldberg
通讯作者：
P. Goldberg
关于约旦河谷的更新世软体动物
DOI：
--
发表时间：
1973
期刊：
影响因子：
--
作者：
E. Tchernov
通讯作者：
E. Tchernov
影响因子：
6.9
作者：
S. Mischke;H. Ginat;B. Al-Saqarat;A. Almogi‐Labin
通讯作者：
S. Mischke;H. Ginat;B. Al-Saqarat;A. Almogi‐Labin