Variscan ultra-high-pressure eclogite in the Upper Allochthon of the Rhodope Metamorphic Complex (Bulgaria)

Trapp Svenja; Janak Marian; Fassmer Kathrin; Froitzheim Nikolaus; Muenker Carsten; Georgiev Neven

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Variscan ultra-high-pressure eclogite in the Upper Allochthon of the Rhodope Metamorphic Complex (Bulgaria)

机译：Variscan超高压Eclogite在罗地偶变质复合物（保加利亚）

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The Rhodope Metamorphic Complex (RMC) in Bulgaria has been established as a Mesozoic ultra-high-pressure metamorphic province by findings of microdiamond in gneisses. Additionally, Variscan ultra-high-pressure metamorphism has been proposed for the Ograzhden/Vertiskos Unit in the Upper Allochthon of the RMC, based on findings of coesite, graphite pseudomorphs after diamond and indirect age constraints. We confirm ultra-high-pressure metamorphism of eclogites in this unit using thermobarometry, phase-equilibrium modelling and the Variscan age of metamorphism using Lu-Hf garnet-whole-rock dating. In Belica (southern Rila Mountains), kyanite- and phengite-bearing eclogite enclosed in high-grade gneisses records P-T conditions of 3.0-3.5 GPa and 700-750 degrees C. Lu-Hf dating of eclogite samples from Belica and Gega (Ograzhden Mountain), where coesite was found, yielded ages of 334.1 +/- 1.8 and 334.0 +/- 2.2 Ma, respectively, interpreted as the age of garnet growth during post-collisional subduction of continental crust after closure of the Rheic Ocean.

机译：保加利亚的罗多普变质杂岩（RMC）已被确定为中生代超高压变质区，在片麻岩中发现了微金刚石。此外，根据柯石英、金刚石和间接年龄限制后的石墨假象的发现，已提议对RMC上部外来区的Ograzhden/Vertiskos单元进行华力西超高压变质作用。我们利用热气压计、相平衡模型和Lu-Hf石榴石全岩测年法确定了该单元榴辉岩的超高压变质作用。在贝利卡（南日拉山），包在高级片麻岩中的蓝晶石和多硅白云母榴辉岩记录了3.0-3.5 GPa和700-750°C的P-T条件。对贝利卡和盖加（奥格拉什登山）发现柯石英的榴辉岩样品进行Lu-Hf测年，得出的年龄分别为334.1+/-1.8和334.0+/-2.2 Ma，解释为Rheic海洋闭合后大陆地壳碰撞后俯冲期间石榴石生长的年龄。

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来源
《Terra Nova》 |2021年第2期|共10页
作者
Trapp Svenja; Janak Marian; Fassmer Kathrin; Froitzheim Nikolaus; Muenker Carsten; Georgiev Neven;
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作者单位

Univ Bonn Inst Geosci Meckenheimer Allee 169 D-53115 Bonn Germany;

Slovak Acad Sci Inst Earth Sci Bratislava Slovakia;

Univ Bonn Inst Geosci Meckenheimer Allee 169 D-53115 Bonn Germany;

Univ Bonn Inst Geosci Meckenheimer Allee 169 D-53115 Bonn Germany;

Univ Cologne Inst Geol &

Mineral Cologne Germany;

Sofia Univ St Kliment Ohridski Dept Geol &

Paleontol Sofia Bulgaria;

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正文语种 eng
中图分类天文学、地球科学;
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2. Kinematics and time of emplacement of the Upper Allochthon of the Rhodope Metamorphic Complex: evidence from the Rila Mountains, Bulgaria [J] . Gorinova Tsvetelina, Georgiev Neven, Cherneva Zlatka, International Journal of Earth Sciences . 2019,第7期

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Variscan ultra-high-pressure eclogite in the Upper Allochthon of the Rhodope Metamorphic Complex (Bulgaria)

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