Palustrine carbonates and pedogenic calcretes in the ?al basin of SW Anatolia: Implications for the Plio-Pleistocene regional climatic pattern in the eastern Mediterranean

详细信息    查看全文

• 作者：H¨¹lya Al?i?ek ; Mehmet Cihat Al?i?ek
• 关键词：SW Turkey ; Neogene&ndash ; Quaternary ; Paleoclimate ; Stable isotopes ; Freshwater carbonates
• 刊名：Catena
• 出版年：2014
• 出版时间：January, 2014
• 年：2014
• 卷：112
• 期：Complete
• 页码：48-55
• 全文大小：2639 K

文摘

Sedimentologic and stable isotopic studies in the ?al basin-fill provide new insights on the late Neogene-Quaternary climatic pattern in the eastern Mediterranean. Long-term subsidence and terrestrial sedimentation in the basin beginning in the late Miocene are recorded in alluvial fan and fluvial deposits overlain by Pliocene palustrine carbonates. An erosional unconformity separates the Pleistocene siliciclastic and calcrete deposits above as a single sedimentary unit resting on top of floodplain fines and restricted to the basin center.

The stable isotopic analysis of the palustrine carbonates and pedogenic calcretes displays a wide range of values (? 7.98 < ¦Ä¹⁸O < ? 6.38¡ë and ? 8.89 < ¦Ä¹⁸O < ? 7.06¡ë, respectively) and the lack of significant ¦Ä¹⁸O-¦Ä¹³C covariance (r = 0.59 and 0.24) may indicate subhumid conditions or significant diagenetic alteration. The ¦Ä¹³C values of these carbonates (? 7.71 < ¦Ä¹³C < ? 4.08¡ë and ? 9.15 < ¦Ä¹³C < ? 6.17¡ë, respectively), organic ¦Ä¹³C data from calcretes (? 27.88 and ? 24.57¡ë, average value: ? 26.53¡ë), and floral remains indicate that the landscapes were dominated by C3 forest plants.