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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Geology, mineralogy, and geochemistry of late Miocene paleosol and calcrete in the western part of the Central Anatolian Volcanic Province (CAVP), Turkey
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Geology, mineralogy, and geochemistry of late Miocene paleosol and calcrete in the western part of the Central Anatolian Volcanic Province (CAVP), Turkey

机译：地质，矿物学，和地球化学的后期古醇古溶胶和Calcrete在中央阿纳托利亚火山省（CAVP），土耳其

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The late Miocene was characterized by high global temperatures and partly to nearly complete desiccation of the Mediterranean Sea throughout the latter part of the Messinian age (the Messinian salinity crisis). The non-marine paleoenvironmental and paleoclimatic records from the Mediterranean area are highly limited in their spatial range. Late Miocene river flood-plain sediments in the Central Anatolian Volcanic Province (CAVP) of central Turkey consist of siliciclastic and pyroclastic sediments with paleosols and calcrete. Five lithofacies were identified as (A) massive conglomerate, (B) trough-cross-bedded sandstone, (C) massive mudstone, (D) disrupted mud, (E) and disrupted matrix-supported conglomerate. The paleosols were composed predominantly of smectite and illite with smaller amounts of feldspar, quartz, opal-A, pyroxene and amphibole, and the calcretes were composed mainly of calcite, with smaller amounts of feldspar, quartz and opal-A, and minor amounts of smectite, chlorite and illite. Authigenic clay minerals and micritic calcite coating on the detrital grains and soil peds and pendant cement in the calcrete and paleosol horizons were evidence of a vadose zone. In contrast, the large equant spar drusy mosaics were formed in phreatic environments. The weathering of ignimbrite and marble led to the depletion of SiO2, CaO, Al2O3, Fe2O3, TiO2, and K2O through the precipitation of smectite and illite in the paleosols, and CaO in the form of micrite and calcite in the calcrete horizons. Field observations, mineralogy, geochemistry and the results of delta O-18 and delta C-13 isotopic analysis reveal that alternating wet and dry periods resulted in an upward increase in precipitation of authigenic smectite and illite within the late Miocene sections, under the influence of geochemical and pH fluctuations in phreatic or vadose water within the river flood-plain paleoenvironment.
机译：后期内科的特点是全球性高温，部分地在梅内尼亚时代的后期（Messinian Salinity Crisis）的后期几乎完全干燥。来自地中海面积的非海洋古环境和古跨线记录在其空间范围内极大限制。中央火鸡中央阿纳托利亚火山省（CAVP）的后期内科河泛滥沉积物由古溶胶和浅粉症组成。将五种锂外均鉴定为（a）大规模的砾岩，（b）槽 - 横床砂岩，（c）大规模泥岩，（d）破坏泥浆，（e）并破坏基质负载的集团。古溶胶主要由蒙脱石和伊尔石，具有较少量的长石，石英，蛋白石-A，焦素和倒角糖石，并且囊组成主要由方解石组成，具有较少量的长石，石英和蛋白石-A和少量蒙脱土，亚氯酸盐和illite。在碎屑颗粒和土壤peds上的Aheyenic粘土矿物质和微团氧涂层和棕榈酱和古溶解的悬浮液中的悬崖水泥是囊糖区的证据。相比之下，在潜水环境中形成了大型刻斯斯福尼斯疣状马赛克。通过在古醇中的蒙脱石和伊雷米斯的沉淀，在古溶解和岩石中的沉淀中，Ignimbrite和Marble的风化导致了SiO2，CaO，Al2O3，Fe2O3，TiO2和K2O的耗尽。野外观察，矿物学，地球化学和δO-18的结果和ΔC-13同位素分析表明，交替的湿和干燥时期导致了在后部内联部分内的Authigenic Smectite和Iffite的沉淀量向上增加河流普通古环境中潜水或Vadose水中的地球化学和pH波动。

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