The Jurassic–Lower Cretaceous successions cropping out in three different parts of Central Anatolia (Turkey) were deposited in local basins developed under tectonic influence from the Hettangian to the Oxfordian. Pelagic carbonate platforms (PCPs) were formed in the region during two separate phases in which synsedimentary faulting was active in the basins. Prior to the first tectonic phase, fluvial and tidal sediments, Hettangian-Sinemurian in age, were deposited unconformably on the low-grade metamorphic substrate of the Karakaya Complex (Upper Triassic), with Sinemurian crinoidal limestones above. At the end of the Sinemurian, the PCPs were developed as a result of fragmentation of shallow-marine platforms by normal faults. Across hanging-wall basins and footwall-blocks, the PCP facies: pelagic/hemipelagic nodular and marly Ammonitico Rosso facies, brachiopod-bearing limestone facies with hardgrounds, red fossiliferous mudstone, and calcareous Ammonitico Rosso facies containing blocks, were deposited with marked lateral thickness variations. The platform, which gradually became shallower in relation to the clastic sediments (180 m thick) filling the basin, was fragmented again at the end of the Bathonian. The opening of fractures in the platform is documented by neptunian dykes developed within the clastic facies, filled with Callovian ammonite-bearing mudstone. During the Callovian–Oxfordian, widespread ammonite-bearing red marl draped the clastic facies, although nodular pelagic and oolitic/ammonite limestones are locally present. Moreover, Oxfordian pelagic oolitic facies rest unconformably on Upper Triassic sandstone (Karakaya complex), which is locally intercalated between the metamorphics and the Jurassic cover, wherever these had been unroofed at the footwall of Jurassic normal faults. As a result of the tectonic activity during the Callovian–Oxfordian time, the Ankara region totally became a PCP in the Oxfordian. Condensed, nodular, pelagic oolitic–ammonitic limestones were deposited across the major uplifted blocks in an open-marine environment, previously called the Ankara seamount. These facies constitute an important key level in the Ankara region. Laterally continuous deep-marine sediments overlying the Late Oxfordian–Early Cretaceous PCP deposits indicate the rapid foundering of this sector.

中文翻译：

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安卡拉地区（安纳托利亚中部-土耳其）侏罗纪远洋碳酸盐台地沉积学

在安纳托利亚中部（土耳其）三个不同地区出产的侏罗纪-下白垩纪层序沉积在当地的盆地中，这些盆地是在从赫唐阶到牛津阶的构造影响下形成的。该地区在两个独立的阶段形成了远洋碳酸盐平台（PCP），其中盆地中的同沉积断层活动活跃。在第一构造阶段之前，河流和潮汐沉积物，年龄为 Hettangian-Sinemurian，不整合地沉积在 Karakaya 杂岩体（上三叠纪）的低品位变质基底上，上面是 Sinemurian 海百合灰岩。在 Sinemurian 末期，由于浅海平台被正断层破碎，PCP 被开发。横跨上盘盆地和下盘地块，PCP 相：远洋/半远洋结节状和泥灰岩相、含腕足动物的石灰岩相和硬地、红色化石泥岩和含块体的钙质 Ammonitico Rosso 相沉积，具有明显的横向厚度变化。相对于充满盆地的碎屑沉积物（180 m 厚），该平台逐渐变浅，在巴松阶末再次破碎。在碎屑相内发育的海王星岩脉记录了平台中裂缝的开放，其中充满了含卡洛夫菊石的泥岩。在卡洛夫-牛津阶，广泛的含菊石的红色泥灰岩覆盖在碎屑相上，尽管局部存在结节状远洋和鲕粒/菊石石灰岩。而且，牛津阶远洋鲕粒相不整合地位于上三叠统砂岩（Karakaya 杂岩体）上，该砂岩局部夹在变质岩和侏罗纪盖层之间，在侏罗纪正断层的下盘这些变质岩和侏罗纪盖层之间没有露顶。由于卡洛夫-牛津时期的构造活动，安卡拉地区完全成为牛津时期的 PCP。在以前称为安卡拉海山的开阔海洋环境中，凝缩的、结节的、远洋鲕粒-氨质灰岩沉积在主要隆起块体上。这些相构成了安卡拉地区的重要关键层。晚牛津阶至早白垩世 PCP 沉积物上的横向连续深海沉积物表明该部门正在迅速沉没。它局部地夹在变质岩和侏罗纪盖层之间，在侏罗纪正断层的下盘这些没有被覆盖的地方。由于卡洛夫-牛津时期的构造活动，安卡拉地区完全成为牛津时期的 PCP。在以前称为安卡拉海山的开阔海洋环境中，凝缩的、结节的、远洋鲕粒-氨质灰岩沉积在主要隆起块体上。这些相构成了安卡拉地区的重要关键层。晚牛津阶至早白垩世 PCP 沉积物上的横向连续深海沉积物表明该部门正在迅速沉没。它局部地夹在变质岩和侏罗纪盖层之间，在侏罗纪正断层的下盘这些没有被覆盖的地方。由于卡洛夫-牛津时期的构造活动，安卡拉地区完全成为牛津时期的 PCP。在以前称为安卡拉海山的开阔海洋环境中，凝缩的、结节的、远洋鲕粒-氨质灰岩沉积在主要隆起块体上。这些相构成了安卡拉地区的重要关键层。晚牛津阶至早白垩世 PCP 沉积物上的横向连续深海沉积物表明该部门正在迅速沉没。安卡拉地区完全成为牛津人的 PCP。在以前称为安卡拉海山的开阔海洋环境中，凝聚的、结节的、远洋鲕粒-氨质灰岩沉积在主要隆起块体上。这些相构成了安卡拉地区的重要关键层。晚牛津阶至早白垩世 PCP 沉积物上的横向连续深海沉积物表明该部门正在迅速沉没。安卡拉地区完全成为牛津人的 PCP。在以前称为安卡拉海山的开阔海洋环境中，凝缩的、结节的、远洋鲕粒-氨质灰岩沉积在主要隆起块体上。这些相构成了安卡拉地区的重要关键层。晚牛津阶至早白垩世 PCP 沉积物上的横向连续深海沉积物表明该部门正在迅速沉没。