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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Tectonothermal evolution of the northeastern margin of Iberia since the break-up of Pangea to present, revealed by low-temperature fission-track and (U-Th)/He thermochronology - A case history of the Catalan Coastal Ranges
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Tectonothermal evolution of the northeastern margin of Iberia since the break-up of Pangea to present, revealed by low-temperature fission-track and (U-Th)/He thermochronology - A case history of the Catalan Coastal Ranges

机译：自Pangea破裂到现在，伊比利亚东北缘的构造热演化，由低温裂变径迹和（U-Th）/ He热年代学揭示-加泰罗尼亚沿海山脉的案例历史

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The Catalan Coastal Ranges (CCR) form part of the northeastern Iberian Mediterranean margin. This margin typifies the transition zone between the thickened crust of the Pyrenees and Ebro Basin (32 to 40 km), and the extremely thinned continental crust of the offshore Valencia Trough (8 km). Despite intensive geological research in recent decades, the issue of the unsolved thermochronological history has hardly been addressed for the Catalan Margin. This study provides for the first time a continuous low-temperature thermochronological dataset covering the period from Late Paleozoic to present-day. More than 100 analyses have been performed in an area less than 200 km long by 50 km wide. Zircon and apatite fission-track (ZFT and AFT) results of the Hercynian basement yield cooling ages between 254 +/- 41-104 +/- 16 Ma and 223 +/- 27-16 +/- 3 Ma, respectively. Apatite (U-Th)/He ages range between 58 +/- 3 and 2.0 +/- 0.2 Ma. These thermochronological data provide evidence for a very active geothermal past, revealing above all an important thermal period coeval with the Triassic-Early Jurassic break-up of Pangea. Hereby we discuss and suggest various mechanisms responsible for the elevated crustal temperatures detected. This new dataset also provides new constraints on the allocation of areas where exhumation/uplift occurred synchronous with some tectonic phases, the widespread presence of hydrothermal mineralizations and the present-day overmaturity state of the Mesozoic sediments, with regard to oil potential, in the CCR. Despite the local scale of the Catalan Margin, the very detailed study here presented sheds some light on the geological implications of results from other more regional thermochronological studies on the Iberian Microplate. Studies that yield similar Mesozoic thermochronological record for areas that also experienced extensional fracturing and subsidence during the break-up of Pangea. (c) 2006 Elsevier B.V. All rights reserved.
机译：加泰罗尼亚海岸山脉（CCR）是东北伊比利亚地中海边缘的一部分。这个边缘代表了比利牛斯山脉和埃布罗盆地的增厚地壳（32至40 km）与近海瓦伦西亚海槽（8 km）的极薄大陆壳之间的过渡带。尽管近几十年来进行了深入的地质研究，但尚未解决加泰罗尼亚边缘的热年代史问题。这项研究首次提供了一个连续的低温热年代学数据集，涵盖了从晚古生代到今天的时期。在长度不足200公里，宽50公里的区域内进行了100多次分析。海西地下室的锆石和磷灰石裂变径迹（ZFT和AFT）结果分别为254 +/- 41-104 +/- 16 Ma和223 +/- 27-16 +/- 3 Ma之间的冷却年龄。磷灰石（U-Th）/ He的年龄介于58 +/- 3和2.0 +/- 0.2 Ma之间。这些热年代学数据为非常活跃的地热历史提供了证据，最重要的是揭示了与Pangea三叠纪-早侏罗世破裂有关的重要热期。因此，我们讨论并提出了各种机制，这些机制负责检测到的地壳温度升高。这个新的数据集还对CCR中与某些构造阶段同步发生发掘/隆升的区域分配，热液矿化的广泛存在以及中生代沉积物的现时过熟状态提供了新的限制。 。尽管加泰罗尼亚边缘的局部规模，但这里进行的非常详细的研究为伊比利亚微孔板其他区域热年代学研究结果的地质意义提供了一些启示。对于在Pangea破裂过程中也经历了伸展压裂和沉陷的地区，产生了类似的中生代热年代学记录。 （c）2006 Elsevier B.V.保留所有权利。

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