保加利亚东罗多布地块高品位基底的近冈瓦南奥陶系地壳碎片:U-Pb LA-ICP-MS锆石年代学和地球化学证据

IF 1.5 Q1 Earth and Planetary Sciences Geodinamica Acta Pub Date : 2013-12-01 DOI:10.1080/09853111.2013.858942
N. Bonev, Maria Ovtcharova-Schaltegger, R. Moritz, P. Marchev, A. Ulianov
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引用次数: 37

摘要

利用高品位基底变质岩和演化岩的野外、地球化学和年代学资料,确定了罗多彼地块前高寒期地壳生长的性质和时间。这些岩石侵入于碎屑-碳酸盐岩变质沉积层序中。岩石学和矿物化学表明其成分符合阿尔卑斯角闪岩相变质作用,该变质作用使原岩的原始火成岩结构被湮没。整体岩石地球化学鉴定出低钛拉斑岩-钙碱性辉长岩-玄武岩和斜长花岗岩前体,具有MORB-IAT超俯冲带特征和与现代弧后玄武岩相似的微量元素。锆石U-Pb定年结果显示,原岩岩浆结晶的平均年龄为455 Ma,其中含有继承的寒武系(528-534 Ma)锆石。石炭纪、侏罗纪和始新世变质事件覆盖了奥陶纪原岩。变质岩的辐射测量结果表明,奥陶系洋壳参与了罗多彼高品位基底的形成。始新世-渐新世火山岩上覆或横切变质岩的定年提供了新元古代、奥陶系和二叠-石炭系的异晶锆石样本,这些锆石在从基底到地表的途中采集。因此,火山岩确认了新元古代和古生代火成岩和变质基底的亚区域存在。将中晚奥陶世洋岩浆活动的起源解释为一个沿冈瓦南周边卡多米尼亚基底地体扩张的弧后裂陷扩张中心,与莱西大洋扩张有关。研究结果强调了高等级基底中卡多米亚北部冈瓦纳边缘元素的存在和莱西洋演化的记录。东罗多彼地块的高等级基底与邻近新元古代和寒武-奥陶系演化的地体具有相似的构造-岩浆记录,为爱琴海北部阿尔卑斯带合并的基底地体之间提供了联系。
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Peri-Gondwanan Ordovician crustal fragments in the high-grade basement of the Eastern Rhodope Massif, Bulgaria: evidence from U-Pb LA-ICP-MS zircon geochronology and geochemistry
Field, geochemical, and geochronologic data of high-grade basement metamafic and evolved rocks are used to identify the nature and timing of pre-Alpine crustal growth of the Rhodope Massif. These rocks occur intrusive into clastic-carbonate metasedimentary succession. Petrography and mineral chemistry show compositions consistent with Alpine amphibolite-facies metamorphism that obliterated the original igneous textures of the protoliths. Bulk-rock geochemistry identifies low-Ti tholeiitic to calc-alkaline gabbroic-basaltic and plagiogranite precursors, with MORB-IAT supra-subduction zone signature and trace elements comparable to modern back-arc basalts. The U-Pb zircon dating revealed a mean age of 455 Ma for the magmatic crystallization of the protoliths that contain inherited Cambrian (528–534 Ma) zircons. Carboniferous, Jurassic, and Eocene metamorphic events overprinted the Ordovician protoliths. The radiometric results of the metamorphic rocks demonstrate that Ordovician oceanic crust was involved in the build-up of the Rhodope high-grade basement. Dating of Eocene-Oligocene volcanic rocks overlying or cross-cutting the metamorphic rocks supplied Neoproterozoic, Ordovician and Permo-Carboniferous xenocrystic zircons that were sampled en route to the surface from the basement. The volcanic rocks thus confirm sub-regionally present Neoproterozoic and Paleozoic igneous and metamorphic basement. We interpret the origin of the Middle-Late Ordovician oceanic magmatism in a back-arc rift-spreading center propagating along peri-Gondwanan Cadomian basement terrane related to the Rheic Ocean widening. The results highlight the presence of elements of Cadomian northern Gondwana margin in the high-grade basement and record of Rheic Ocean evolution. The eastern Rhodope Massif high-grade basement compared to adjacent terranes with Neoproterozoic and Cambro-Ordovician evolution shares analogous tectono-magmatic record providing a linkage among basement terranes incorporated in the Alpine belt of the north Aegean region.
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来源期刊
Geodinamica Acta
Geodinamica Acta 地学-地球科学综合
CiteScore
4.50
自引率
0.00%
发文量
0
审稿时长
25 weeks
期刊介绍: Geodinamica Acta provides an international and interdisciplinary forum for the publication of results of recent research dealing with both internal and external geodynamics. Its aims to promote discussion between the various disciplines that work on the dynamics of the lithosphere and hydrosphere. There are no constraints over themes, provided the main thrust of the paper relates to Earth''s internal and external geodynamics. The Journal encourages the submission of papers in all fields of earth sciences, such as biostratigraphy, geochemistry, geochronology and thermochronology, geohazards and their societal impacts, geomorphology, geophysics, glaciology, igneous and metamorphic petrology, magmatism, marine geology, metamorphism, mineral-deposits and energy resources, mineralogy, orogeny, palaeoclimatology, palaeoecology, paleoceanograpgy, palaeontology, petroleum geology, sedimentology, seismology and earthquakes, stratigraphy, structural geology, surface processes, tectonics (neoteoctonic, plate tectonics, seismo-tectonics, Active tectonics) and volcanism. Geodinamica Acta publishes high quality, peer-reviewed original and timely scientific papers, comprehensive review articles on hot topics of current interest, rapid communications relating to a significant advance in the earth sciences with broad interest, and discussions of papers that have already appeared in recent issues of the journal. Book reviews are also included. Submitted papers must have international appeal and regional implications; they should present work that would be of interest to many different specialists. Geographic coverage is global and work on any part of the world is considered. The Journal also publishes thematic sets of papers on topical aspects of earth sciences or special issues of selected papers from conferences.
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