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首页> 外文期刊>Facies >The Triassic platform of the Gador-Turon unit (Alpujarride complex, Betic Cordillera, southeast Spain): climate versus tectonic factors controlling platform architecture
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The Triassic platform of the Gador-Turon unit (Alpujarride complex, Betic Cordillera, southeast Spain): climate versus tectonic factors controlling platform architecture

机译：Gador-Turon单元的三叠纪平台（Alpujarride大楼，Betic Cordillera，西班牙东南部）：气候对构造因素的控制

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摘要

A litho-biostratigraphic analysis has been carried out in the Gador-Turon unit of the Sierra de Gador (Alpujarride complex, Betic Cordillera, SE Spain). The Triassic succession of this unit is composed of a lower meta-detrital formation overlain by an upper meta-carbonate formation divided in six members. In the latter, a Ladinian–Carnian-rich fossil association has been found (foraminifers, algae, bivalves, microproblematica, trace fossils). Facies analysis has enabled the recognition of 22 facies of platform origin. This succession accumulated as a subsiding margin-type carbonate platform with homoclinal ramp geometry (Anisian?–Ladinian) evolving into a faultblock- type platform with a steeper-margined geometry (Ladinian–Carnian). Slope deposits of this latter platform show a prism-like geometry with progradational patterns and include syn-sedimentary structures associated with normal faults capped by younger beds. The results of the present research indicate that the architecture of the platform studied has been controlled mainly by climate and oceanic factors during the development of the ramp, and by syn-sedimentary extensional tectonics during the development of the steeper-margined platform. The Ladinian– Carnian tectonic activity was probably also responsible for the siliciclastic input and the shift to a mixed terrigenouscarbonate platform.
机译：岩石生物地层分析已在塞拉利昂德加多尔的Gador-Turon单元（西班牙东南部Betic Cordillera的Alpujarride建筑群）进行。该单元的三叠纪演替由下部的碎屑岩地层和上部的偏碳酸盐岩地层（分为六个部分）组成。在后者中，已经发现了一个富含拉丁尼亚-卡恩的化石协会（有孔虫，藻类，双壳类，微问题，微量化石）。相分析使得能够识别平台起源的22个相。该演替积累为具有斜斜斜坡几何形状（Anisian？–Ladinian）的下陷边缘型碳酸盐台地，发展成为具有较陡峭边缘几何形状（Ladinian–Carnian）的断层块型平台。后一个平台的斜坡沉积物显示出具有渐进样式的棱柱状几何形状，并且包括与年轻断层所覆盖的正常断层有关的同沉积构造。本研究结果表明，所研究平台的结构在坡道发展过程中主要受到气候和海洋因素的控制，而在陡峭边缘平台发展过程中受到同沉积的伸展构造的控制。拉丁-卡尼构造活动也可能是硅质碎屑输入和向混合陆源碳酸盐岩台地转变的原因。

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