喀尔巴阡-巴尔干半岛环莫西米亚岩层的构造演化:古地磁制约因素

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Emő Márton , Vesna Cvetkov , Miodrag Banješević , Gábor Imre , Aleksandar Pačevski
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引用次数: 0

摘要

本次研究的地区位于塞尔维亚东部,即位于瓦尔达尔区和莫伊西亚之间的达努比库姆和蒂莫克岩浆岩群(Timok Magmatic Complex,Geticum的一部分)。前者源于莫伊西亚,并在最近的白垩纪期间推移到 Geticum 上,后者代表了与俯冲有关的 Apuseni-Banat-Timok-Srednogorie (ABTS) 成矿带的中心部分。基于 18 个地理分布的取样点(228 个野外定向钻芯)得出的新结果表明,Danubicum 地区上侏罗世(下白垩世)碳酸盐岩的 CW 垂直轴旋转较大,而 TMC 地区上白垩世火成岩和沉积岩的 CW 垂直轴旋转适中。这些数据与早先公布的古地磁数据一起,为测试环马埃岛弧后凸岩圈模型提供了运动学约束。走向测试图清楚地表明这是一个渐进弧。在金属带火山活动时期(90-70 Ma),起始情况肯定是一个总体呈东西走向的 S 段,然后继续呈西北-东南走向的 ABT 段。从瓦尔达尔区和阿普塞尼山的中新世古地磁结果来看,环莫西米亚带目前的几何形状被解释为两个主要构造过程的结果。第一个是与瓦尔达尔区(20-17Ma)协调发生的约 30° 垂直轴 CW 旋转。第二种是由于东喀尔巴阡山脉的俯冲拉力与莫伊西亚的拐角效应相结合,发生了额外的 40-65° CW 旋转(17-15Ma),其中也涉及到多努比库姆山脉。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tectonic evolution of the Circum-Moesian orocline of the Carpatho-Balkanides: Paleomagnetic constraints

The areas of the present study in eastern Serbia, the Danubicum and the Timok Magmatic Complex (TMC, part of the Geticum) are situated between the Vardar Zone and Moesia. The first is Moesia derived and thrust over the Geticum during the latest Cretaceous, the second represents the central segment of the subduction related Apuseni-Banat-Timok-Srednogorie (ABTS) metallogenic belt. The new results, based on 18 geographically distributed sampling points (228 field oriented drill cores) imply large CW vertical axis rotations for the Upper Jurassic (Lower Cretaceous) carbonates of the Danubicum and a moderate one for the Upper Cretaceous igneous and sedimentary rocks from the TMC. These, together with earlier published paleomagnetic data provide kinematic constraints to test the circum-Moesian backarc-convex orocline model. The strike test plot clearly documents that it is a progressive arc. The starting situation at the time of the volcanic activity in the metallic belt (90–70 Ma) must have been a generally E-W oriented S segment, continuing in NNW-SSE oriented ABT segments. The present geometry of the circum-Moesian belt, in the context of Miocene paleomagnetic results from the Vardar Zone and the Apuseni Mts, is interpreted as the result of two main tectonic processes. The first is an about 30° vertical axis CW rotation which took place in coordination with the Vardar Zone (20–17 Ma). The second is an additional 40–65° CW rotation (17–15 Ma) involving also the Danubicum, due to the subduction pull of the E Carpathians in combination with the corner effect of Moesia.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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