Peak‐temperature patterns of polyphase metamorphism resulting from accretion, subduction and collision (eastern Tauern Window, European Alps) – a study with Raman microspectroscopy on carbonaceous material (RSCM)

Peak‐temperature patterns of polyphase metamorphism resulting from accretion, subduction and collision (eastern Tauern Window, European Alps) – a study with Raman microspectroscopy on carbonaceous material (RSCM)
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由吸积、俯冲和碰撞引起的多相变质作用的峰值温度模式(东陶恩窗,欧洲阿尔卑斯山)——碳质材料拉曼显微光谱研究(RSCM)

DOI:
10.1111/jmg.12048
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发表时间:
2013
影响因子:
3.4
通讯作者:
Schmid
Schmid
中科院分区:
地球科学1区
文献类型:
--
作者:
Scharf;Ziemann;Schmid

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Tauern窗口东部碳质物质的拉曼光谱(RSCM)显示,三个不同的组构区域的峰值温度模式截然不同,每个区域都经历了多变质造山演化:Tauern窗口东北部的区域1保存了大洋单位(格洛克纳推覆系统,Matrei带),其峰值温度(Tp)在晚白垩世至古近纪在一个增生的楔形体中堆积后达到350-480℃。中央Tauern窗的区域2经历了500-10°C的温度,这是在古近纪俯冲通道折返或阿尔卑斯碰撞造山带内渐新世巴罗型热叠置期间达到的。东部Tauern亚穹顶的区域3具有峰值-温度模式,该模式是由来自欧洲远端边缘的大陆单元在始渐新世推覆叠加而成。由于后推覆穹隆和沿Katschberg剪切带系统(KSZS)的伸展剪切作用,这种模式在中新世获得了目前的同心模式。最大的(Hochalm)穹隆的Tp值从核心的612℃到边缘的440℃不等。最大的峰值温度梯度(≤70°C/KM−1)出现在这个穹顶的东缘,在那里,卡施伯格正断层的糜棱岩剪切作用显著地减薄了亚便尼期和彭尼期推覆体,包括先前存在的峰值温度梯度。
Raman microspectroscopy on carbonaceous material (RSCM) from the eastern Tauern Window indicates contrasting peak‐temperature patterns in three different fabric domains, each of which underwent a poly‐metamorphic orogenic evolution: Domain 1 in the northeastern Tauern Window preserves oceanic units (Glockner Nappe System, Matrei Zone) that attained peak temperatures (Tp) of 350–480 °C following Late Cretaceous to Palaeogene nappe stacking in an accretionary wedge. Domain 2 in the central Tauern Window experiencedTpof 500–535 °C that was attained either within an exhumed Palaeogene subduction channel or during Oligocene Barrovian‐type thermal overprinting within the Alpine collisional orogen. Domain 3 in the Eastern Tauern Subdome has a peak‐temperature pattern that resulted from Eo‐Oligocene nappe stacking of continental units derived from the distal European margin. This pattern acquired its presently concentric pattern in Miocene time due to post‐nappe doming and extensional shearing along the Katschberg Shear Zone System (KSZS).Tpvalues in the largest (Hochalm) dome range from 612 °C in its core to 440 °C at its rim. The maximum peak‐temperature gradient (≤70 °C km−1) occurs along the eastern margin of this dome where mylonitic shearing of the Katschberg Normal Fault (KNF) significantly thinned the Subpenninic‐ and Penninic nappe pile, including the pre‐existing peak‐temperature gradient.
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