Metamorphic P-T-t evolution of amphibolite in the north Hengshan terrane, North China Craton: Insights into the late Paleoproterozoic tectonic processes from initial collision to final exhumation

2021 ◽  
Author(s):  
Jiahui Qian ◽  
Changqing Yin ◽  
Shun Li ◽  
Jian Zhang
Keyword(s):  
North China Craton ◽  
North China ◽  
Mafic Granulite ◽  
Valuable Insight ◽  
Medium Temperature ◽  
The North ◽  
Tectonic Processes ◽  
Isothermal Decompression ◽  
Orogenic Belts ◽  
Insight Into

Amphibolite retrograded from high-pressure (HP) mafic granulite can provide valuable insight into exhumation of deeply buried crust in orogenic belts. In the north Hengshan terrane of the North China Craton, amphibolite occurs as rims of HP mafic granulite block or as smaller homogeneous boudins representing retrograde products of the granulite. Three amphibolite samples were selected. The rocks are mainly composed of hornblende + plagioclase + quartz + biotite + ilmenite with or without garnet pseudomorph consisting of plagioclase + hornblende + ilmenite and symplectite of hornblende + plagioclase ± clinopyroxene. The pseudomorph-, symplectite-bearing sample experienced a post-peak isothermal decompression at >800 °C that was accompanied by breakdown of garnet and clinopyroxene. Isopleths of the maximum An in plagioclase and Ti in hornblende were used to constrain the Tmax stage of ca. 6 kbar/825−850 °C, which was followed by cooling and post-cooling decompression. For the sample showing an “equilibrated” mineral assemblage, a medium-temperature decompression from >6.8 kbar/685 °C to 3.6−4.8 kbar/640−660 °C was inferred. P-T evolution of the north Hengshan terrane is characterized by two discrete (post-peak and post-cooling) decompression processes. Zircon U-Pb dating of amphibolite yields a metamorphic age of 1868 ± 15 Ma, which is interpreted to record the timing of late amphibolization. Synthesized metamorphic P-T-t data in the Hengshan-Wutai area indicate a complicated tectonic evolution that includes an older collisional orogeny at ca. 1.95 Ga and a younger metamorphism at ca. 1.85 Ga. The post-cooling decompression path of the amphibolite may reflect final exhumation of the north Hengshan terrane through the late deformation/metamorphism of the Zhujiafang shear zone.

Zircon U–Pb geochronology of the Zanhuang metamorphic complex: reappraisal of the Palaeoproterozoic amalgamation of the Trans-North China Orogen

2013 ◽  
Vol 150 (4) ◽  
pp. 756-764 ◽  
Author(s):  
LING-LING XIAO ◽  
GUO-DONG WANG ◽  
HAO WANG ◽  
ZONG-SHENG JIANG ◽  
CHUN-RONG DIWU ◽  
...  
Keyword(s):  
High Resolution ◽  
North China Craton ◽  
North China ◽  
Metamorphic Complex ◽  
Middle Section ◽  
The South ◽  
The North ◽  
Facies Metamorphism ◽  
Isothermal Decompression ◽  
Metamorphic Terranes

AbstractAmphibolites and metapelites exposed in the Zanhuang metamorphic complex situated in the south-middle section of the Trans-North China Orogen (TNCO) underwent upper-amphibolite-facies metamorphism and record clockwise P–T paths including retrograde isothermal decompression. High-resolution zircon U–Pb geochronological analyses indicate that the metamorphic peak occurred during ~ 1840–1860 Ma, which is in accordance with the ubiquitous metamorphic ages of ~ 1850 Ma retrieved by miscellaneous geochronologic methods throughout the metamorphic terranes of the northern TNCO, confirming that the south-middle section of the TNCO was involved in the amalgamation of the Eastern and Western Blocks of the North China Craton during the Palaeoproterozoic.

scholarly journals Supplemental Material: Metamorphic P-T-t evolution of amphibolite in the north Hengshan terrane, North China Craton: Insights into the late Paleoproterozoic tectonic processes from initial collision to final exhumation

2020 ◽  
Author(s):  
Jiahui Qian ◽  
et al.
Keyword(s):  
North China Craton ◽  
North China ◽  
Bulk Rock ◽  
Isotopic Data ◽  
The North ◽  
Tectonic Processes ◽  
Icp Ms

Table S1: Selected microprobe analyses for amphibolite from the north Hengshan terrane; Table S2: Bulk-rock compositions and their normalized mole-proportions of amphibolite from the north Hengshan terrane; Table S3: Zircon U-Pb isotopic data obtained by LA-ICP-MS for amphibolite sample H1718 from the north Hengshan terrane; Table S4: Titanium and ree compositions (ppm) of zircons for amphibolite sample H1718 from the north Hengshan terrane.

scholarly journals Untangling the Annot sand fairway: structure and stratigraphy of the Eastern Champsaur Basin (Eocene–Oligocene), French Alps

2020 ◽  
Vol 177 (6) ◽  
pp. 1197-1209
Author(s):  
Robert W. H. Butler ◽  
Henry W. Lickorish ◽  
Jamie Vinnels ◽  
William D. McCaffrey
Keyword(s):  
French Alps ◽  
The Past ◽  
The North ◽  
Tectonic Processes ◽  
Floor Structure ◽  
Basin Floor ◽  
Definition Of ◽  
Basement Deformation ◽  
Orogenic Belts ◽  
Insight Into

Early foredeep successions can yield insight into tectonic processes operating adjacent to and ahead of fledgling orogenic belts but are commonly deformed by the same orogens. We develop a workflow towards stratigraphic understanding of these deformed basins, applied to the Eastern Champsaur Basin of the French Alps. This contains a down-system correlative of the southern-sourced (Eocene–Oligocene) Annot turbidites. These strata are deformed by arrays of west-facing folds that developed beneath the Embrunais–Ubaye tectonic allochthon. The folds vary in geometry through the stratigraphic multilayer. Total shortening in the basin is around 4 km and the restored (un-decompacted) stratal thickness exceeds 980 m. The turbidites are generally sand-rich and bed-sets can be correlated through the entire fold train. The succession shows onlap and differential thickening indicating deposition across palaeobathymetry that evolved during active basement deformation, before being overridden by the allochthon. The sand system originally continued over what is now the Ecrins basement massif that, although contributing to basin floor structure, served only to confine and potentially focus further sediment transport to the north. Deformation ahead of the main Alpine orogen appears to have continued progressively, and the past definition of distinct ‘phases’ (‘pre-’ and ‘post-Nummulitic’) is an artefact of the stratigraphic record.

Wide rift model in Bohai Bay Basin: insight into the destruction of the North China Craton

2014 ◽  
Vol 56 (5) ◽  
pp. 537-554 ◽  
Author(s):  
Jinbao Su ◽  
Wenbin Zhu ◽  
Juan Chen ◽  
Bin Min ◽  
Bihai Zheng
Keyword(s):  
North China Craton ◽  
North China ◽  
Bohai Bay ◽  
Bohai Bay Basin ◽  
The North ◽  
Insight Into

scholarly journals TTG and Potassic Granitoids in the Eastern North China Craton: Making Neoarchean Upper Continental Crust during Micro-continental Collision and Post-collisional Extension

2016 ◽  
Vol 57 (9) ◽  
pp. 1775-1810 ◽  
Author(s):  
Chao Wang ◽  
Shuguang Song ◽  
Yaoling Niu ◽  
Chunjing Wei ◽  
Li Su
Keyword(s):  
Continental Crust ◽  
North China Craton ◽  
North China ◽  
Continental Collision ◽  
The North ◽  
Upper Continental Crust ◽  
Low Degree ◽  
High Grade Metamorphism ◽  
Different Depths ◽  
Orogenic Belts

As the major component, Archean granitoids provide us with an insight into the formation of the early continental crust. We report the study of a series of Neoarchean granitoids, including tonalite–trondhjemite–granodiorite (TTG) and potassic granitoids, in the Xingcheng region of the eastern North China Craton. Zircon U–Pb dating shows that the TTG granitoids were emplaced in the Neoarchean within a 75 Myr period (2595–2520 Ma), with coeval mafic magmatic enclaves, followed by intrusion of potassic granitoids. The geochemistry of the TTG granitoids is consistent with partial melting of Mesoarchean enriched mafic crustal sources at different depths (up to 10–12 kbar equivalent pressure) during a continental collision event. The potassic granitoids are derived from either low-degree melting of Mesoarchean enriched mafic crustal sources or remelting of Mesoarchean TTGs in response to post-collisional extension, and were hybridized with Neoarchean mantle-derived mafic melts to various degrees. The TTG and potassic granitoids in the Xingcheng region record the evolution from collision of micro-continental blocks to post-collisional extension, consistent with other studies, suggesting that the amalgamation of micro-continental blocks is what gave rise to the cratonization of the North China Craton at the end of the Archean. The rock assemblage of these granitoids resembles those of syn- and post-collisional magmatism in Phanerozoic orogenic belts, and the estimated average composition is similar to that of the present-day upper continental crust, suggesting that a prototype upper continental crust might have been developed at the end of the Archean from a mixture of TTG and potassic granitoids. Together with concurrent high-grade metamorphism in the North China Craton, we conclude that collisional orogenesis is responsible for continental cratonization at the end of the Archean in the North China Craton.

scholarly journals Supplemental Material: Metamorphic P-T-t evolution of amphibolite in the north Hengshan terrane, North China Craton: Insights into the late Paleoproterozoic tectonic processes from initial collision to final exhumation

2020 ◽  
Author(s):  
Jiahui Qian ◽  
et al.
Keyword(s):  
North China Craton ◽  
North China ◽  
Bulk Rock ◽  
Isotopic Data ◽  
The North ◽  
Tectonic Processes ◽  
Icp Ms

Table S1: Selected microprobe analyses for amphibolite from the north Hengshan terrane; Table S2: Bulk-rock compositions and their normalized mole-proportions of amphibolite from the north Hengshan terrane; Table S3: Zircon U-Pb isotopic data obtained by LA-ICP-MS for amphibolite sample H1718 from the north Hengshan terrane; Table S4: Titanium and ree compositions (ppm) of zircons for amphibolite sample H1718 from the north Hengshan terrane.

The Paleoproterozoic diorite dykes in the southern margin of the North China Craton: Insight into rift-related magmatism

2016 ◽  
Vol 277 ◽  
pp. 26-46 ◽  
Author(s):  
Changming Wang ◽  
Yongjun Lu ◽  
Xinyu He ◽  
Qionghui Wang ◽  
Jing Zhang
Keyword(s):  
North China Craton ◽  
North China ◽  
The North ◽  
Southern Margin ◽  
Insight Into

scholarly journals Highly heterogeneous Late Mesozoic lithospheric mantle beneath the North China Craton: evidence from Sr–Nd–Pb isotopic systematics of mafic igneous rocks

2004 ◽  
Vol 141 (1) ◽  
pp. 55-62 ◽  
Author(s):  
ZHANG HONG-FU ◽  
SUN MIN ◽  
ZHOU MEI-FU ◽  
FAN WEI-MING ◽  
ZHOU XIN-HUA ◽  
...  
Keyword(s):  
North China Craton ◽  
Lithospheric Mantle ◽  
North China ◽  
Geochemical Characteristics ◽  
Compositional Variation ◽  
Late Mesozoic ◽  
Mafic Intrusions ◽  
The North ◽  
Long Time ◽  
Orogenic Belts

The lithospheric mantle beneath the North China Craton changed dramatically in its geophysical and geochemical characteristics from Palaeozoic to Cenozoic times. This study uses samples of Mesozoic basalts and mafic intrusions from the North China Craton to investigate the nature of this mantle in Mesozoic times. Sr–Nd–Pb isotopic data demonstrate that the Late Mesozoic lithospheric mantle was extremely heterogeneous. In the central craton or the Luzhong region, it is slightly Sr–Nd isotopically enriched, beneath the Taihangshan region it has an EM1 character (87Sr/86Sri=0.7050–0.7066; εNd(t)=−17–−10), and beneath the Luxi–Jiaodong region, it possesses EM2-like characteristics (87Sr/86Sri up to 0.7114). Compositional variation with time is also apparent in the Mesozoic lithospheric mantle. Our data suggest that the old lithospheric mantle was modified during Mesozoic times by a silicic melt, where beneath the Luxi–Jiaodong region it was severely modified, but in the Luzhong and Taihangshan regions the effects were much less marked. The silicic melt may have been the product of partial melting of crustal materials brought into the mantle by the subducted slab during the formation of circum-cratonic orogenic belts. This Mesozoic mantle did not survive for a long time, and was replaced by a Cenozoic mantle with depleted geochemical characteristics.

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