Academic Journal
High-pressure mafic granulites in the Trans-North China Orogen: Tectonic significance and age
| العنوان: | High-pressure mafic granulites in the Trans-North China Orogen: Tectonic significance and age |
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| المؤلفون: | Zhang, J, Zhao, GC, Sun, M, Wilde, SA, Li, SZ, Liu, SW |
| المساهمون: | Zhao, GC (reprint author), Univ Hong Kong, Dept Earth Sci, James Lee Sci Bldg,Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China., Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China., Curtin Univ Technol, Dept Appl Geol, Bentley, WA 6102, Australia., Ocean Univ China, Coll Marine Geosci, Qingdao 266003, Peoples R China., Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China., Univ Hong Kong, Dept Earth Sci, James Lee Sci Bldg,Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China. |
| المصدر: | SCI |
| بيانات النشر: | gondwana research |
| سنة النشر: | 2006 |
| المجموعة: | Peking University Institutional Repository (PKU IR) / 北京大学机构知识库 |
| مصطلحات موضوعية: | high-pressure granulite, Trans-North China Orogen, P-T paths, North China Craton, paleoproterozoic tectonics, P-T PATH, ND ISOTOPIC CONSTRAINTS, TEMPERATURE TIME PATHS, EASTERN HEBEI PROVINCE, SINO-KOREAN CRATON, SM-ND, FUPING COMPLEX, CENTRAL ZONE, BASEMENT ROCKS, SANGGAN AREA |
| الوصف: | High-pressure malic granulites (including retrograded eclogites) have been reported from the Trans-North China Orogen, a Paleoproterozoic orogenic belt along which two discrete continental blocks, referred to as the Eastern and Western Blocks, were amalgamated to form the North China Craton. Extensive metamorphic investigations and geochronology carried out over the last few years provide important insights into the age and significance of these high-pressure granulites, which are critical in understanding of the timing and tectonic processes involved in the assembly of the North China Craton. Most high-pressure mafic granulites in the Trans-North China Orogen preserve the high-pressure granulite facies assemblage garnet + plagioclase + clinopyroxene + quartz, the medium-pressure granulite facies assemblage garnet + plagioclase + clinopyroxene + orthopyroxene quartz, the low-pressure granulite facies assemblage orthopyroxene + clinopyroxene + plagioclase +quartz, and the amphibolite facies assemblage hornblende + plagioclase. Minor high-pressure granulites preserve the early eclogite facies mineral assemblage of garnet + quartz + omphacite pseudomorph (clinopyroxene + Na-rich plagioclase), indicating that they are retrograded eclogites. These mineral assemblages and their PT estimates define a clockwise P-T path involving near-isothermal decompression and cooling following the peak high-pressure metamorphism, which suggests that they formed during continent-continent collision. Field mapping and geochronology indicate that the precursors of these high-pressure granulites were mafic dykes which were emplaced at similar to 1915 Ma and underwent high-pressure granulite facies metamorphism at similar to 1.85 Ga. Taken together, the high-pressure granulites in the Trans-North China are considered to have resulted from final collision between the Eastern and Western Blocks to form the North China Craton at similar to 1.85 Ga, not at similar to 2.5 Ga as recently proposed by some authors. (c) 2005 International ... |
| نوع الوثيقة: | journal/newspaper |
| اللغة: | English |
| تدمد: | 1342-937X |
| Relation: | GONDWANA RESEARCH.2006,9,(3),349-362.; 982415; http://hdl.handle.net/20.500.11897/252523; WOS:000238416600008 |
| DOI: | 10.1016/j.gr.2005.10.005 |
| الاتاحة: | https://hdl.handle.net/20.500.11897/252523 https://doi.org/10.1016/j.gr.2005.10.005 |
| رقم الانضمام: | edsbas.F53515DE |
| قاعدة البيانات: | BASE |
| تدمد: | 1342937X |
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| DOI: | 10.1016/j.gr.2005.10.005 |