کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4722968 1639629 2014 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Contrasting chemical and isotopic signatures from Neoproterozoic metasedimentary rocks in the Central Iberian Zone (Spain) of pre-Variscan Europe: Implications for terrane analysis and Early Ordovician magmatic belts
ترجمه فارسی عنوان
کنتراست امضای شیمیایی و ایزوتوپی از سنگ های ناپروتروزوئیک متادیسیتیک در منطقه مرکزی ایربری (اسپانیا) پیش از واریسکان اروپا: پیامدهای تحلیل تررنگ و کمربندهای ماگمایی اورودیویک اولیه
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی


• Neoproterozoic metapelites from the northern and southern CIZ are chemically different.
• Metapelites from the N-CIZ show high LILE, LREE, Th, U, Zr contents.
• Metapelites from the N-CIZ have high negative ɛNd540 values and old Nd model ages.
• Contrasted Early Ordovician magmatic belts appear in both zones.
• Two new terranes within the CIZ can be defined.

Neoproterozoic metasedimentary units from central Spain and the northern Central Iberian Zone (CIZ) show distinctive geochemical signatures with respect to the Schist-Greywacke Complex, which is dominant in the southwestern part of the CIZ. Significant differences occur in major and trace element composition and initial Nd isotope ratios, which cannot be explained in terms of metamorphic grade and/or anatexis in some layers of these metasedimentary sequences. ɛNd540 values from metapelites of central Spain range from −5.6 to −10.4 whereas those from the Schist-Greywacke Complex span a narrower and higher range of −0.8 to −3.1. This difference suggests different source regions. The presence of two contrasting Early Ordovician magmatic belts in both subzones reinforces the idea of different Precambrian basement terranes in the CIZ. These data are crucial for pre-Variscan paleogeographic reconstructions of the westernmost European terranes and for checking the validity of current subdivisions of the Iberian Massif.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precambrian Research - Volume 245, May 2014, Pages 131–145
نویسندگان
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