DOI: 10.1007/s00531-014-1088-4
Scopus记录号: 2-s2.0-84925497042
论文题名: Upper crustal emplacement and deformation of granitoids inside the Uppermost Unit of the Cretan nappe stack: constraints from U–Pb zircon dating, microfabrics and paleostress analyses
作者: Kneuker T. ; Dörr W. ; Petschick R. ; Zulauf G.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 104, 期: 2 起始页码: 351
结束页码: 367
语种: 英语
英文关键词: Asteroussia complex
; Cretan mélange
; Granitoids
; Greece
; Uppermost Unit
; U–Pb geochronology
英文摘要: The present study is dealing with the emplacement and deformation of diorite and quartz diorite exposed along new road cuts between Agios Nikolaos and Sitia (Uppermost Unit, eastern Crete). Mingling of both melt types is indicated by enclaves of diorite inside quartz diorite and vice versa. The diorite and quartz diorite intruded into coarse-grained white marble, which is in lateral contact to, but also forms the roof of, the intrusive body. Evidence for contact metamorphism is indicated by increasing grain size of calcite in the marble with decreasing distance from the diorite. U–Pb (TIMS) dating of zircons, separated from quartz diorite, yielded a concordant age at 74.0 ± 0.25 Ma, which is interpreted as emplacement age. As this age is close to published K–Ar cooling ages of hornblende and biotite, the melt should have intruded and cooled down rapidly at upper structural levels, which is not common for granitoids of the Uppermost Unit of Crete. Upper crustal melt emplacement is also documented by stoped blocks and by the lack of any ductile (viscous) deformation. The diorite and quartz diorite, however, are affected by strong post-Oligocene brittle faulting. Paleostress analysis, based on these faults, revealed a change in stress field from N–S and NNW–SSE shortening by thrusting (convergence between African and European plates) to NNE–SSW and NE–SW shortening accommodated by strike-slip (SW-ward extrusion of the Anatolian microplate). Calcite-twin density indicates high differential stress (260 ± 20 MPa) related to these phases of crustal shortening. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925497042&doi=10.1007%2fs00531-014-1088-4&partnerID=40&md5=9bbf874d47d094112996fd2ba9fe0c66
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70376
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institut für Geowissenschaften, Goethe-Universität Frankfurt a.M., Altenhöferalle 1, Frankfurt am Main, Germany
Recommended Citation:
Kneuker T.,Dörr W.,Petschick R.,et al. Upper crustal emplacement and deformation of granitoids inside the Uppermost Unit of the Cretan nappe stack: constraints from U–Pb zircon dating, microfabrics and paleostress analyses[J]. International Journal of Earth Sciences,2014-01-01,104(2)