Paleoclimate reconstruction of the quaternary sediments near the Gulf of Aqaba (Southern Jordan)
Paleoclimate reconstruction of the quaternary sediments near the Gulf of Aqaba (Southern Jordan)
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DOI：
10.1007/s12517-016-2346-5
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发表时间：
2016-05-01
影响因子：
--
通讯作者：
Al-Shdaifat, Ahmad
中科院分区：
文献类型：
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作者：
Abbas, Mahmoud;Al-Saqarat, Bety;Al-Shdaifat, Ahmad
本文对形成于亚喀巴海湾边缘的第四纪“亚喀巴组”进行了沉积学研究。该地层主要由粘土层组成，夹有易碎的粉砂质、中粗粒砂岩，通常为平面交错层理，由垂直洞穴生物扰动，以及胶结不良的多矿物砾岩。它也由粘土支撑的砾岩层组成，偶尔显示出相互的关系。该地层的时代为早更新世，由于亚喀巴组中存在绿色粘土层，这意味着它是在河流淡水环境下沉积的。上覆的更新世沉积物中也富含介形类化石，显示出淡水环境。一般来说，这一时期的气候条件较为潮湿，这一点可以从没有蒸发岩沉积物（例如，岩盐和/或石膏）。粘土矿物成分（高岭石和伊利石/蒙皂石混合层）和palygoritum的情况下支持的潮湿的条件。值得一提的是，主要的非粘土矿物是石英和菱镁矿。这项研究提供了亚喀巴湾边缘在第四纪的发展，并反映了这一时期的气候变化。
In this paper, the "Aqaba Formation" formed at the margins of the Aqaba Gulf, during the Quaternary, is sedimentologically studied. This formation consists mainly of clayey beds intercalated with friable silty, medium to coarse-grained sandstones, commonly with planar cross bedding, bioturbated by vertical burrows, and poorly cemented polymict conglomerate. It is also comprised of beds of clay-supported conglomerates occasionally displaying intertonguing relationships. The age of the formation is from Lower Pleistocene.Due to the presence of greenish clay layers within the Aqaba Formation, this means that it was deposited under a stream fresh water environment. It is also noticed that the overlain Pleistocene sediments are rich in Ostracods suggesting a fresh water environment, too. Generally, wetter climatic conditions were prevailing at this period as indicated by the absence of evaporite deposits (e.g., halite and/or gypsum). The clay mineral constituents (kaolinite and illite/smectite intermixed layers) and the absence of palygorskite are supported by the wetter conditions. It is worth to mention that the essential non-clay minerals are quartz and feldspars.This study presents the developments of the margins of the Gulf of Aqaba during Quaternary and reflects the climatic changes during this period.