Zircon Hf-O isotope evidence for recycled oceanic and continental crust in the sources of alkaline rocks

Geology ◽  
2017 ◽  
Vol 45 (5) ◽  
pp. 407-410 ◽  
Author(s):  
Yu-Sheng Zhu ◽  
Jin-Hui Yang ◽  
Jin-Feng Sun ◽  
Hao Wang
Keyword(s):  
Continental Crust ◽  
Alkaline Rocks ◽  
Isotope Evidence ◽  
O Isotope ◽  
Oceanic And Continental Crust

Zircon U-Pb dating and Hf-O isotope characteristics of Changchengian alkaline rocks from the Yanliao Rift in the North China Craton

2021 ◽  
Vol 37 (1) ◽  
pp. 231-252
Author(s):  
ZHANG Jian ◽  
◽  
LI HuaiKun ◽  
TIAN Hui ◽  
LIU Huan ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Alkaline Rocks ◽  
The North ◽  
O Isotope

French and Belgian Uplands

2005 ◽  
Author(s):  
Bernard Etlicher
Keyword(s):  
Continental Crust ◽  
Rift Valley ◽  
Sedimentary Basins ◽  
Shear Zones ◽  
Metamorphic Complex ◽  
French Massif Central ◽  
Massif Central ◽  
Montagne Noire ◽  
Oceanic And Continental Crust ◽  
Moderate Elevation

The French Uplands were built by the Hercynian orogenesis. The French Massif Central occupies one-sixth of the area of France and shows various landscapes. It is the highest upland, 1,886 m at the Sancy, and the most complex. The Vosges massif is a small massif, quite similar to the Schwarzwald in Germany, from which it is separated by the Rhine Rift Valley. Near the border of France, Belgium, and Germany, the Ardennes upland has a very moderate elevation. The largest part of this massif lies in Belgium. Though Brittany is partly made up of igneous and metamorphic rocks, it cannot be truly considered as an upland; in the main parts of Brittany, altitudes are lower than in the Parisian basin. Similarities of the landscape in the French and Belgian Uplands derive from two major events: the Oligocene rifting event and the Alpine tectonic phase. The Vosges and the Massif Central are located on the collision zone of the Variscan orogen. In contrast, the Ardennes is in a marginal position where primary sediments cover the igneous basement. Four main periods are defined during the Hercynian orogenesis (Bard et al. 1980; Autran 1984; Ledru et al. 1989; Faure et al. 1997). The early Variscan period corresponds to a subduction of oceanic and continental crust and a highpressure metamorphism (450–400 Ma) The medio- Variscan period corresponds to a continent–continent collision of the chain (400–340 Ma). Metamorphism under middle pressure conditions took place and controlled the formation of many granite plutons: e.g. red granites (granites rouges), porphyroid granite, and granodiorite incorporated in a metamorphic complex basement of various rocks. The neo-Variscan period (340–320 Ma) is characterized by a strong folding event: transcurrent shear zones affected the units of the previous periods and the first sedimentary basins appeared. At the end of this period, late-Variscan (330–280 Ma), autochthonous granites crystallized under low-pressure conditions related to a post-collision thinning of the crust. Velay and Montagne Noire granites are the main massifs generated by this event. Sediment deposition in tectonic basins during Carboniferous and Permian times occurred in the Massif Central and the Vosges: facies are sandstone (Vosges), shale, coal, and sandstone in several Stephanian basins of the Massif Central, with red shale and clay ‘Rougier’ in the south-western part of the Massif Central.

scholarly journals Olivine Oxygen Isotope Evidence for Intracontinental Recycling of Delaminated Continental Crust

2018 ◽  
Vol 19 (7) ◽  
pp. 1913-1924 ◽  
Author(s):  
Chun‐Guang Wang ◽  
Wen‐Liang Xu ◽  
De‐Bin Yang ◽  
Yong‐Sheng Liu ◽  
Fu‐Ping Pei ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Continental Crust ◽  
Isotope Evidence

Relict zircon U-Pb age and O isotope evidence for reworking of Neoproterozoic crustal rocks in the origin of Triassic S-type granites in South China

Lithos ◽  
2018 ◽  
Vol 300-301 ◽  
pp. 261-277 ◽  
Author(s):  
Peng Gao ◽  
Yong-Fei Zheng ◽  
Yi-Xiang Chen ◽  
Zi-Fu Zhao ◽  
Xiao-Ping Xia
Keyword(s):  
South China ◽  
Crustal Rocks ◽  
Isotope Evidence ◽  
O Isotope

Continental growth through accreted oceanic arc: Zircon Hf–O isotope evidence for granitoids from the Qinling orogen

2016 ◽  
Vol 182 ◽  
pp. 109-130 ◽  
Author(s):  
Hao Wang ◽  
Yuan-Bao Wu ◽  
Shan Gao ◽  
Zheng-Wei Qin ◽  
Zhao-Chu Hu ◽  
...  
Keyword(s):  
Qinling Orogen ◽  
Isotope Evidence ◽  
O Isotope ◽  
Continental Growth
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