DOI: 10.1016/j.palaeo.2014.10.010
论文题名: Paleolatitudes of Late Triassic radiolarian cherts from Argolis, Greece: Insights on the paleogeography of the western Tethys
作者: Muttoni G. ; Tartarotti P. ; Chiari M. ; Marieni C. ; Rodelli D. ; Dallanave E. ; Kirscher U.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 417 起始页码: 476
结束页码: 490
语种: 英语
英文关键词: Argolis
; Greece
; Late triassic
; Ophiolitic basalts
; Paleomagnetism
; Radiolarian biostratigraphy
; Vardar
英文摘要: The Hellenides fold-and-thrust range comprises two subparallel ophiolite belts of Triassic to Jurassic age - the external ophiolite belt (e.g., Mirdita, Pindos, Argolis) in the west, and the internal ophiolite belt in the east - broadly separated by the continental crust units of the Korabi-Pelagonian Zone. It is still a matter of debate whether these ophiolites derived from a single ocean (Meliata-Maliac-Vardar) or mark the suture of two distinct oceanic seaways (Pindos and Meliata-Maliac-Vardar). We contribute to the resolution of this controversy by studying the Migdalitsa Ophiolitic Complex in Argolis (Greece), which contains Triassic oceanic basalts and pertains to the external (western) ophiolite belt. Three key areas were mapped and several sites were targeted for structural, biostratigraphic, and paleomagnetic analyses. Radiolarian cherts in primary or tectonic contact with oceanic basalts were dated to the Late Triassic (Carnian-Norian) using radiolarians, and provided paleomagnetic directions of primary origin carried by magnetite and hematite. The derived mean direction was corrected for sedimentary inclination shallowing and yielded a paleolatitude of ~. 22°N that was placed in a broader paleogeographic context by reconstructing Pangea at ~. 225. ±. 5. Ma using a recent apparent polar wander path corrected for sedimentary inclination shallowing. The Late Triassic paleogeography of the Tethys Ocean was constrained using additional paleolatitude estimates from the literature, which we checked and corrected (when possible) for sedimentary inclination shallowing. According to our reconstruction, the Meliata-Maliac-Vardar Ocean between Adria - the promontory of Africa - and Europe represents the locus of origin of the Late Triassic Argolis ophiolitic rocks of the external ophiolite belt, presently resting in tectonic contact on the Pindos-Subpelagonian zones, which represent a deep-water trough with no substantial evidence of in situ oceanization in the Triassic. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69106
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Dipartimento di Scienze della Terra A. Desio, Università degli Studi di Milano, via Mangiagalli 34, Milano, Italy; ALP - Alpine Laboratory of Paleomagnetism, via Luigi Massa 6, Peveragno, CN, Italy; C.N.R. - Istituto di Geoscienze e Georisorse, via G. La Pira 4, Florence, Italy; Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, United Kingdom; Department of Earth and Environmental Science, Ludwig-Maximilians University, Munich, Germany
Recommended Citation:
Muttoni G.,Tartarotti P.,Chiari M.,et al. Paleolatitudes of Late Triassic radiolarian cherts from Argolis, Greece: Insights on the paleogeography of the western Tethys[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,417