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首页> 外文期刊>Geologica Carpathica >Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)
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Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

机译：斯洛文尼亚盆地三叠纪/侏罗纪边界间隔下沉积脉冲记录（东南阿尔卑斯南部）

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摘要

In the Alpine Realm the Early Jurassic is characterized by the disintegration and partial drowning of vast platform areas. In the eastern part of the Southern Alps (present-day NW Slovenia), the Julian Carbonate Platform and the adjacent E-W extending Slovenian Basin underwent partial disintegration, drowning and deepening from the Pliensbachian on, whereas only nominal environmental changes developed on the large Dinaric (Friuli, Adriatic) Carbonate Platform to the south (structurally part of the Dinarides). These events, however, were preceded by an earlier - and as yet undocumented extensional event - that took place near the Triassic/Jurassic boundary. This paper provides evidence of an accelerated subsidence from four selected areas within the Slovenian Basin, which show a trend of eastwardly-decreasing deformation. In the westernmost (Mrzli vrh) section - the Upper Triassic platform-margin - massive dolomite is overlain by the earliest Jurassic toe-of-slope carbonate resediments and further, by basin-plain micritic limestone. Further east (Perbla and Liscak sections) the Triassic-Jurassic transition interval is marked by an increase in resedimented carbonates. We relate this to the increasing inclination and segmentation of the slope and adjacent basin floor. The easternmost (Mt. Porezen) area shows a rather monotonous, latest Triassic-Early Jurassic basinal sedimentation. However, changes in the thickness of the Hettangian-Pliensbachian Krikov Formation point to a tilting of tectonic blocks within the basin area. Lateral facies changes at the base of the formation indicate that the tilting occurred at and/or shortly-after the Triassic/Jurassic boundary.
机译：在高山境界，早期的侏罗纪的特点是庞大平台区域的崩解和部分溺水。在南阿尔卑斯南部（现今NW斯洛文尼亚）的东部，朱利安碳酸盐平台和相邻的EW延伸斯洛文尼亚盆地接受了部分崩解，淹没和深化从Pliensbachian上，而只有在大型那甲基的标称环境变化仅开发（ Friuli，亚得里亚人）碳酸盐平台到南方（二巴三甲酸酯的结构部分）。然而，这些事件之前是较早的 - 和尚未记录的扩展事件 - 在三叠系/侏罗纪边界附近发生。本文提供了斯洛文尼亚盆地中四个选定地区的加速下降的证据，表明了反向变形的趋势。在最西方（MRZLI VRH）部分 - 上三叠系平台 - 裕度 - 巨大的白云石是最早的侏罗纪脚趾碳酸盐群落覆盖，进一步俯仰，进一步通过盆地普通的微米石灰石。进一步的东（Perbla和Liscak部分）三叠层的侏罗纪过渡间隔标志着被剥夺的碳酸酯的增加。我们将这与坡度和邻近盆地地板的倾斜和分割相提并论。最东部（MT.Porezen）地区显示了一个相当单调的最新的最新的三叠层早期侏罗纪沉淀物。然而，Hettangian-Pliensbachian Krikov形成点的变化变为盆地内部构造块的倾斜。侧面在地层的基础上改变表明倾斜发生在三叠系/侏罗纪边界之后和/或短时间内发生。

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