Disproving the Presence of Paleozoic‐Triassic Metamorphic Rocks on the Island of Zannone (Central Italy): Implications for the Early Stages of the Tyrrhenian‐Apennines Tectonic Evolution

Tectonics ◽  
2020 ◽  
Vol 39 (12) ◽  
Author(s):  
Manuel Curzi ◽  
Andrea Billi ◽  
Eugenio Carminati ◽  
Federico Rossetti ◽  
Richard Albert ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Central Italy ◽  
Metamorphic Rocks ◽  
Early Stages

The Gubbio normal fault (Central Italy): geometry, displacement distribution and tectonic evolution

2004 ◽  
Vol 26 (12) ◽  
pp. 2233-2249 ◽  
Author(s):  
F. Mirabella ◽  
M.G. Ciaccio ◽  
M.R. Barchi ◽  
S. Merlini
Keyword(s):  
Tectonic Evolution ◽  
Central Italy ◽  
Normal Fault ◽  
Displacement Distribution

Plutonic and metamorphic rocks from the Keraf Suture (NE Sudan): a glimpse of Neoproterozoic tectonic evolution on the NE margin of W. Gondwana

2003 ◽  
Vol 123 (1) ◽  
pp. 67-80 ◽  
Author(s):  
T Bailo ◽  
H Schandelmeier ◽  
G Franz ◽  
Chih-Hsien Sun ◽  
R.J Stern
Keyword(s):  
Tectonic Evolution ◽  
Metamorphic Rocks

scholarly journals Geochemistry and Zircon U-Pb-Hf Isotopes of Metamorphic Rocks from the Kaiyuan and Hulan Tectonic Mélanges, NE China: Implications for the Tectonic Evolution of the Paleo-Asian and Mudanjiang Oceans

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 836
Author(s):  
Zuozhen Han ◽  
Jingjing Li ◽  
Zhigang Song ◽  
Guyao Liu ◽  
Wenjian Zhong ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Middle Triassic ◽  
Late Triassic ◽  
Metamorphic Rocks ◽  
Late Permian ◽  
Early Permian ◽  
Ne China ◽  
The North ◽  
Tectonic Mélange ◽  
Final Closure

The Late Paleozoic–Early Mesozoic tectonic evolution of the Changchun-Yanji suture (CYS) was mainly associated with the Paleo-Asian and Mudanjiang tectonic regimes. However, the spatial and temporal overprinting and variations of these two regimes remains are still dispute. In order to evaluate this issue, in this contribution, we present new zircon U-Pb ages and a whole-rock geochemical and zircon Hf isotopic dataset on a suite of metamorphic rocks, including gneisses, actinolite schist, leptynites, and biotite schists, from tectonic mélanges in northern Liaoning and central Jilin provinces, NE China. Based on zircon LA-ICP-MS U-Pb dating results, protoliths show wide ranges of aging spectrum, including Paleoproterozoic (2441 Ma), Early Permian (281 Ma), Late Permian (254 Ma), and Late Triassic (230 Ma). The Permian protoliths of leptynites from the Hulan Tectonic Mélange (HLTM) and gneisses from the Kaiyuan Tectonic Mélange (KYTM) exhibit arc-related geochemical signatures, implying that the Paleo-Asian Ocean (PAO) did not close prior to the Late Permian. The Late Triassic protoliths of gneisses from the KYTM, in combination with previously reported coeval igneous rocks along the CYS, comprises a typical bimodal igneous suite in an E–W-trending belt, suggesting a post-orogenic extensional environment. Consequently, we infer that the final closure of the PAO took place during the Early–Middle Triassic. The Early Permian protoliths of biotite schists from the HLTM are alkali basaltic rocks and contain multiple older inherited zircons, which, in conjunction with the geochemical features of the rocks, indicate that they were generated in a continental rift related to the initial opening of the Mudanjiang Ocean (MO). Data from this contribution and previous studies lead us to conclude that the MO probably opened during the Middle Triassic, due to the north–south trending compression caused by the final closure of the PAO.

scholarly journals Petrogenesis and tectonic evolution of metaluminous sub-alkaline granitoids from the Takab Complex, NW Iran

2010 ◽  
Vol 148 (2) ◽  
pp. 250-268 ◽  
Author(s):  
ROBAB HAJIALIOGHLI ◽  
MOHSSEN MOAZZEN ◽  
AHMAD JAHANGIRI ◽  
ROLAND OBERHÄNSLI ◽  
BEATE MOCEK ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Mineral Chemistry ◽  
Quartz Diorite ◽  
Igneous Rocks ◽  
Metamorphic Rocks ◽  
Crustal Melting ◽  
Calc Alkaline ◽  
Nw Iran ◽  
Magmatic Rocks ◽  
Crustal Origin

AbstractThe Takab complex is composed of a variety of metamorphic rocks including amphibolites, metapelites, mafic granulites, migmatites and meta-ultramafics, which are intruded by the granitoid. The granitoid magmatic activity occurred in relation to the subduction of the Neo-Tethys oceanic crust beneath the Iranian crust during Tertiary times. The granitoids are mainly granodiorite, quartz monzodiorite, monzonite and quartz diorite. Chemically, the magmatic rocks are characterized by ASI<1.04, AI<0.87 and high contents of CaO (up to ~14.5 wt%), which are consistent with the I-type magmatic series. Low FeOt/(FeOt+MgO) values (<0.75) as well as low Nb, Y and K2O contents of the investigated rocks resemble the calc-alkaline series. Low SiO2, K2O/Na2O and Al2O3 accompanied by high CaO and FeO contents indicate melting of metabasites as an appropriate source for the intrusions. Negative Ti and Nb anomalies verify a metaluminous crustal origin for the protoliths of the investigated igneous rocks. These are comparable with compositions of the associated mafic migmatites, in the Takab metamorphic complex, which originated from the partial melting of amphibolites. Therefore, crustal melting and a collision-related origin for the Takab calc-alkaline intrusions are proposed here on the basis of mineralogy and geochemical characteristics. The P–T evolution during magmatic crystallization and subsolidus cooling stages is determined by the study of mineral chemistry of the granodiorite and the quartz diorite. Magmatic crystallization pressure and temperature for the quartz-diorite and the granodiorite are estimated to be P~7.8±2.5 kbar, T~760±75°C and P~5±1 kbar, T~700°C, respectively. Subsolidus conditions are consistent with temperatures of ~620°C and ~600°C, and pressures of ~5 kbar and ~3.5 kbar for the quartz-diorite and the granodiorite, respectively.

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