Sedimentary processes and deformation styles of the Mesozoic sedimentary succession in the northern margin of the Mohe basin, NE China: constraints on the final closure of the Mongol–Okhotsk Ocean

2021 ◽  
pp. 105052
Author(s):  
Long Chen ◽  
Chenyue Liang ◽  
Franz Neubauer ◽  
Yongjiang Liu ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Ne China ◽  
Sedimentary Processes ◽  
Northern Margin ◽  
Sedimentary Succession ◽  
Final Closure

The timing of final closure along the Changchun–Yanji suture zone: Constraints from detrital zircon U–Pb dating of the Triassic Dajianggang Formation, NE China

Lithos ◽  
2016 ◽  
Vol 261 ◽  
pp. 216-231 ◽  
Author(s):  
Bin Wang ◽  
Jian-Bo Zhou ◽  
Simon A. Wilde ◽  
Xing-Zhou Zhang ◽  
Shou-Mai Ren
Keyword(s):  
Detrital Zircon ◽  
Suture Zone ◽  
Ne China ◽  
Final Closure

scholarly journals Review of the Ordovician stratigraphy and fauna of the Anarak Region in Central Iran

2015 ◽  
Vol 65 (4) ◽  
pp. 403-435 ◽  
Author(s):  
Leonid E. Popov ◽  
Vachik Hairapetian ◽  
David H. Evans ◽  
Mansoureh Ghobadi Pour ◽  
Lars E. Holmer ◽  
...  
Keyword(s):  
North China ◽  
Cold Water ◽  
Central Iran ◽  
Metamorphic Complex ◽  
North African ◽  
Northern Margin ◽  
Faunal Assemblages ◽  
Lower Ordovician ◽  
Low Diversity ◽  
Sedimentary Succession

Abstract The Ordovician sedimentary succession of the Pol-e Khavand area, situated on the northern margin of the Yazd block, has important differences from those in other parts of Central Iran. It has been established that the presumably terminal Cambrian to Lower Ordovician volcano-sedimentary Polekhavand Formation, exposed in the Pol-e Khavand area, has non-conformable contact with greenschists of the Doshakh Metamorphic Complex. The succeeding, mainly siliciclastic Chahgonbad Formation contains low to moderately diverse faunal assemblages, including brachiopods, cephalopods, trilobites and tentaculitids. The Darriwilian age of the lower part of the formation is well established by the co-occurrence of brachiopod genera Camerella, Phragmorthis, Tritoechia and Yangtzeella. The associated rich cephalopod fauna is different from the Darriwilian cephalopod associations of the Alborz terrane and may show some affinity with warm water faunas of North China and South Korea. It is likely that the Mid Ordovician fauna recovered from the lower part of the Chahgonbad Formation settled in the area sometime during a warming episode in the late Darriwilian. By contrast the low diversity mid Katian brachiopod association includes only three taxa, which occur together with the trilobite Vietnamia cf. teichmulleri and abundant, but poorly preserved tentaculitids questionably assigned to the genus Costatulites. This faunal association bears clear signatures linking it to the contemporaneous cold water faunas of the Arabian, Mediterranean and North African segments of Gondwana. Four brachiopod species recovered from the Chahgonbad Formation, including Hibernodonta lakhensis, Hindella prima, Lomatorthis? multilamellosa and Yangtzeella chupananica are new to science.

Timing of deformation and location of the eastern Liaoyuan Terrane, NE China: Constraints on the final closure time of the Paleo-Asian Ocean

2018 ◽  
Vol 60 ◽  
pp. 194-212 ◽  
Author(s):  
Chengchuan Gu ◽  
Guang Zhu ◽  
Yunjian Li ◽  
Nan Su ◽  
Shiye Xiao ◽  
...  
Keyword(s):  
Ne China ◽  
Closure Time ◽  
Final Closure

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.

Sedimentary processes along Flemish Pass, offshore eastern Canada: a GLORIA and high-resolution seismic reconnaissance

1989 ◽  
Vol 26 (11) ◽  
pp. 2177-2185
Author(s):  
Colin L. Jacobs
Keyword(s):  
High Resolution ◽  
Long Range ◽  
Sidescan Sonar ◽  
Turbidity Currents ◽  
Profile Data ◽  
Eastern Canada ◽  
Sedimentary Processes ◽  
Geostrophic Currents ◽  
Northern Margin ◽  
Sediment Drifts

Long-range sidescan sonar data, as well as deep-towed high-resolution seismic, 10 and 12 kHz echogram, and core data, have allowed an overview of the various sedimentary processes operating along the length of Flemish Pass. At the southern end of the pass profile data reveal that geostrophic currents are actively eroding the flanks of sediment drifts. Depositional lobes at the foot of slope gullies in the centre of Flemish Pass are characterized by elongate diapiric structures around their margins and may have triggered turbidity currents that spread across the floor of the pass. The northern margin of Flemish Pass shows evidence of (possibly historic) downslope sediment movement.

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