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Formation of a Late Jurassic carbonate platform on top of the obducted Dinaridic ophiolites deduced from the analysis of carbonate pebbles and ophiolitic detritus in southwestern Serbia
International Journal of Earth Sciences ( IF 2.3 ) Pub Date : 2020-06-08 , DOI: 10.1007/s00531-020-01886-w
Hans-Jürgen Gawlick , Milan Sudar , Sigrid Missoni , Roman Aubrecht , Felix Schlagintweit , Divna Jovanović , Tomáš Mikuš

In the Inner Dinarides of southwestern Serbia, Tithonian polymictic carbonate turbidites, deposited in a deep-water foreland basin below overthrust ophiolites, contain Kimmeridgian–Tithonian shallow-water clasts, Triassic open-marine limestone and radiolarite clasts, and chrome spinels of a harzburgitic source (suprasubduction and MOR ophiolites). The results from the component analysis of these Tithonian polymictic carbonate turbidites constrain a Middle to Late Jurassic orogeny in the Western Tethys realm with following geodynamic evolution: (1) The closure of the western part of the Neo-Tethys Ocean caused west- to northwestward-directed ophiolite obduction onto the wider Adriatic shelf from Middle Jurassic times onwards. The former Triassic–Middle Jurassic outer passive continental margin of the Neo-Tethys imbricated and a nappe stack in lower plate (wider Adriatic) position was formed in front of the propagating obducting ophiolites. (2) During a period of relative tectonic quiescence, formation of a Late Jurassic carbonate platform started around the Oxfordian/Kimmeridgian boundary on top of the obducted ophiolites. This detection of a Late Jurassic carbonate platform formed above the obducted Dinaridic ophiolites close an important gap in knowledge about the geodynamic evolution of the Inner Dinarides. (3) From the Kimmeridgian/Tithonian boundary onwards uplift of the imbricated rocks below the obducted ophiolites triggered unroofing. During Tithonian times the obducted ophiolites were transported west-directed along low-angle fault plains near to its present position in the Dinarides. Mountain uplift and unroofing caused the partly erosion of the Late Jurassic carbonate platform, the underlying ophiolites and the Triassic–Jurassic nappe stack consisting of outer shelf sedimentary rocks.



中文翻译:

塞尔维亚西南部碳酸盐卵石和蛇纹岩碎屑的分析推导,在被俯冲的蛇纹石蛇绿岩顶部形成了晚侏罗世碳酸盐台地。

在塞尔维亚西南部的内第纳里德,沉积在上推伏蛇绿岩下方的深水前陆盆地中的蒂通尼多碳酸碳酸盐浊积岩中含有基米底亚-蒂通尼浅水碎屑,三叠纪海相石灰石和放射性射手碎屑,以及哈氏成因源的铬尖晶石。 (超俯冲和MOR蛇绿岩)。这些铁通的多碳酸盐碳酸盐浊度的成分分析结果约束了西特提斯地区的中侏罗世造山运动,并伴随着以下的地球动力学演化:(1)新特提斯海洋西部的封闭导致了西向西向西北。从侏罗纪中期起就将蛇绿岩引诱到更广泛的亚得里亚海陆架上。新特提斯带前三叠纪—中侏罗纪外部被动大陆边缘交叠,并在俯冲的蛇绿岩前面形成了下板(较宽的亚得里亚海)位置的一个推覆层。(2)在相对静止的一段时间内,晚侏罗世碳酸盐台地的形成始于被蛇绿岩顶部的牛津/基米底界边界附近。对被俯冲的蛇纹石蛇绿岩上方形成的侏罗纪晚期碳酸盐岩台地的探测,弥补了有关内纳达里德斯内陆动力学演化知识的重要空白。(3)从基米第纪/蒂索尼边界开始,隆起的蛇绿岩之下的嵌岩岩石的隆升触发了顶板化。在铁通时期,被诱变的蛇绿岩沿低角度断层平原向西输送,靠近第纳里德斯目前的位置。山的隆起和顶板作用导致了侏罗纪晚期碳酸盐岩台地,下伏蛇绿岩和由外陆架沉积岩组成的三叠纪-侏罗纪推覆岩层的部分侵蚀。

更新日期:2020-06-08
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