Upper Jurassic–Lower Cretaceous depositional environments and evolution of the Bilecik (Sakarya Zone) and Tauride carbonate platforms, Turkey
Upper Jurassic–Lower Cretaceous depositional environments and evolution of the Bilecik (Sakarya Zone) and Tauride carbonate platforms, Turkey
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土耳其比莱吉克（萨卡里亚带）和塔夫里德碳酸盐台地的上侏罗统-下白垩统沉积环境和演化
DOI：
10.1016/j.palaeo.2016.02.028
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
F. Ocakoğlu
中科院分区：
文献类型：
--
作者：
İ. Yılmaz;D. Altıner;F. Ocakoğlu
用沉积学和旋回地层学方法研究了土耳其中西部(Bilecik和SarıCakaya的Bilecik碳酸盐台地)和土耳其南部的Taurides(Beysehir的Tauride碳酸盐台地)的三个晚侏罗世-早白垩世碳酸盐台地地层剖面。其中一段通过详细的磁化率测量进行了分析。两个地台的周缘碳酸盐在整个剖面上都显示出旋回模式，不含任何硅质碎屑物质。磁化率(MS)分析表明，MS值的小尺度变化可以伴随着相的旋回变化，这可能表明干湿气候交替期间碎屑输入的变化可能是短期海平面变化的控制因素之一。大尺度的MS演化在侏罗系-白垩系界线附近增加，在界线以上减少。这一曲线模式可以与欧洲的一些MS区段相关联，似乎表明在这一关键时间间隔附近存在一致的MS模式。因此，这项研究表明，所研究的浅层碳酸盐台地的海平面变化在几米量级。这些海平面记录的远洋等价物可以沿着边缘追踪到。短期气候控制可以看作是小范围海平面变化的控制因素之一。这种大尺度的变化可能与海洋/气候、三级海平面变化和区域构造的影响有关。
Three Late Jurassic–Early Cretaceous carbonate platform stratigraphic sections have been studied in central western Turkey (Bilecik carbonate platform at Bilecik and Sarıcakaya) and in the Taurides in southern Turkey (Tauride carbonate platform at Beysehir) by using sedimentological and cyclostratigraphical methods. One section was analyzed by detailed magnetic susceptibility measurements. Peritidal carbonates on both platforms display cyclic patterns throughout the sections and do not contain any siliciclastic material. This cyclicity is generally expressed as shallowing upward cycles and interpreted as records of short-term sea-level changes.Magnetic susceptibility (MS) analysis revealed that small scale changes in the MS values can be followed by cyclic alternation of facies and may indicate that varying detrital input during wet and dry climate alternation can be one of the controlling factors for short term sea level changes. The large-scale MS evolution records an increase just around the Jurassic–Cretaceous boundary interval, and a decrease above the boundary. This curve pattern can be correlated with some European MS sections and seems to indicate a consistent MS pattern around this critical interval. Consequently, this study implies that sea-level variations on studied shallow carbonate platforms were on the order of few meters. Pelagic equivalents of these sea-level records can be traced along the margins. Short term climatic control can be seen as one of the controlling factors for small-scale sea-level changes. The large-scale changes can be associated with oceanographic/climatic, third-order sea-level changes and the influence of regional tectonics.