Tectonometamorphic evolution of the Rhodope orogen
Tectonometamorphic evolution of the Rhodope orogen
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DOI：
10.1029/2009tc002513
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发表时间：
2010-07-01
期刊：
影响因子：
4.2
通讯作者：
Hoinkes, Georg
中科院分区：
文献类型：
--
作者：
Krenn, Kurt;Bauer, Christoph;Hoinkes, Georg
本研究结合构造地层学、宏观构造与显微构造、岩石学、地质年代学等新资料，提出了罗多普造山带侏罗纪至古近纪早期构造变质演化的综合模式。来自希腊罗多普中部和东部两个研究区的岩石代表了一个大陆缝合带(罗多普缝合带)，所含物质最有可能在二叠纪/三叠纪期间形成欧洲大陆南部的伸展异形体，随后在早侏罗世(&Gt；=180 Ma)俯冲到欧洲以下。根据可比较的变质年龄和相干构造，但变质条件和岩性不同，将罗多普缝合带的岩石划分为上、下两部分。前进史与下部与俯冲有关的构造联系在一起(单轴伸展，变形阶段d1)。变质岩中最早的变质作用发生在180 Ma左右，至少发生在超高压变质条件下。上部岩石经历了等温降压和部分深熔作用。由于折返楔体内的相对构造位置不同，两部分的折返路径在温度上也不同。晚侏罗世至晚白垩世(变形阶段D2)，Nestos剪切带控制了正常位移的早期阶段，底部(下部)为南西向剪切，顶部(上部)为NE向剪切，强制折返。在上部经历了矿物重结晶和热再平衡的中间阶段之后，在低于12kbar(35-40公里深度)的压力下，两部分都经历了共同的折返历史。在此阶段，折返受控于西南向剪切褶皱作用(变形阶段D3)。板块向南撤退导致了随后的伸展(变形阶段D4)和最终的折返与基底穹隆的形成，从而使罗多普成为一个经典的核心杂岩，与以前的结构更高的单元并列。引文：Krenn，K.，C.Bauer，A.Proyer，U.Klotzli，G.Hoinkes(2010年)，罗多普造山带的构造变质演化，构造学，29，TC4001，DOI：10.1029/2009TC002513。
This study combines new data on tectonostratigraphy, macrostructures and microstructures, petrology, and geochronology to propose a comprehensive model for the tectonometamorphic evolution of the Rhodope orogen from the Jurassic to the early Paleogene. Rocks from two study areas in the central and eastern Greek Rhodope represent a continental suture zone (Rhodope Suture Zone), with the included material most likely forming an extensional allochthon south of the European continent during Permo/Triassic times that was subsequently subducted beneath Europe in the Early Jurassic (>= 180 Ma). On the basis of comparable metamorphic ages and coherent structures but differences in metamorphic conditions and lithologies, the rocks of the Rhodope Suture Zone are subdivided into an upper and a lower part. The prograde history is linked with subduction-related structures in the lower part (uniaxial stretching, deformation stage D1). In metapelites, the earliest stage of metamorphism recorded at circa 180 Ma occurred at least under ultrahigh-pressure metamorphic conditions. The rocks of the upper part experienced isothermal decompression with partial anatexis. Exhumation paths of both parts differ in temperature because of the relative tectonic position within the exhuming wedge. Exhumation was forced by the Nestos Shear Zone that controlled the early phase of normal displacement by SW shearing at the base (lower part) and NE shearing on top (upper part) from the Late Jurassic to the Late Cretaceous (deformation stage D2). An intervening stage of mineral recrystallization and thermal reequilibration in the upper part was followed by a common exhumation history of both parts at pressures lower than about 12 kbar (35-40 km depth). During this stage, exhumation was controlled by southwest directed shearing and folding (deformation stage D3). Slab retreat to the south led to subsequent extension (deformation stage D4) and final exhumation coeval with the formation of basement domes, thus making the Rhodope a classic core complex juxtaposed with former structurally higher units. Citation: Krenn, K., C. Bauer, A. Proyer, U. Klotzli, and G. Hoinkes (2010), Tectonometamorphic evolution of the Rhodope orogen, Tectonics, 29, TC4001, doi:10.1029/2009TC002513.