Geological evolution of the southwestern part of the Veporic Unit (Western Carpathians): based on fission track and morphotectonic data
Geological evolution of the southwestern part of the Veporic Unit (Western Carpathians): based on fission track and morphotectonic data
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Veporic 单元（西喀尔巴阡山脉）西南部的地质演化：基于裂变径迹和形态构造数据
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发表时间：
2017
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通讯作者：
P. Jeřábek
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作者：
R. Vojtko;S. Králiková;P. Andriessen;Roberta Prokešová;J. Minár;P. Jeřábek
摘要应用锆石和磷灰石裂变径迹（FT）及形态构造分析方法，对南Veporic单元西部高寒构造演化进行了定量约束，其与：(1)绿片岩相中古-高寒白垩世推覆体叠加和结晶基底变质作用有关。(2)在古新世（ZFT年龄~ 61 ~ 55 Ma），由于北侧第三系基底的逆冲作用（~ 90 ~ 80 Ma），进行了被动块体挖掘，降温至~ 320 ~ 200℃。(3)始新世缓慢降温至~ 245 ~ 90℃，这很可能反映了上覆推覆体和戈索群沉积物的侵蚀作用。在渐新世（~ 37 ~ 22 Ma）之前，随着盖层推覆体的侵蚀，降温达到60°C。始新世的有效侵蚀在许多地方形成了第一个新生代的地表，并伴有表生高岭土化。(4)早中新世侵蚀与地表降低同时发生，形成有利于高岭土化的第二次夷平面。(5)中新世中期，研究区为Poľana、Javorie和Vepor层状火山覆盖。(6)晚中新世阶段与第三代新生代夷平面侵蚀和形成有关，山脉的最终形成与上新世以来新的加速隆升有关。
Abstract Zircon and apatite fission track (FT) and morphotectonic analyses were applied in order to infer quantitative constraints on the Alpine morphotectonic evolution of the western part of the Southern Veporic Unit which is related to: (1) Eo-Alpine Cretaceous nappe stacking and metamorphism of the crystalline basement in the greenschist facies. (2) Exhumation phase due to underthrusting of the northerly located Tatric-Fatric basement (~ 90–80 Ma), followed by a passive en-block exhumation with cooling through ~ 320–200 °C during the Palaeocene (ZFT ages of ~ 61–55 Ma). (3) Slow Eocene cooling through ~ 245–90 °C, which most likely reflected erosion of the overlying cover nappes and the Gosau Group sediments. Cooling reached up to 60 °C till the Oligocene (AFT ages of ~ 37–22 Ma) in association with erosion of cover nappes. The efficient Eocene erosion led to the formation of the first Cenozoic planation surface with supergene kaolinization in many places. (4) The early Miocene erosion coincided with surface lowering and resulted in the second planation surface favourable for kaolinization. (5) In the middle Miocene, the study area was covered by the Poľana, Javorie, and Vepor stratovolcanoes. (6) The late Miocene stage was related to the erosion and formation of the third Cenozoic planation surface and the final shaping of the mountains was linked to a new accelerated uplift from the Pliocene.