scholarly journals Provenance and tectonic significance of the Zhongwunongshan Group from the Zhongwunongshan Structural Belt in China: insights from zircon geochronology

2020 ◽  
Vol 12 (1) ◽  
pp. 25-43
Author(s):  
Yuan Peng ◽  
Yongsheng Zhang ◽  
Eenyuan Xing ◽  
Linlin Wang
Keyword(s):  
Detrital Zircon ◽  
Sedimentary Basin ◽  
Early Paleozoic ◽  
Granitic Gneiss ◽  
Metamorphic Belt ◽  
Early Devonian ◽  
Tectonic Environment ◽  
Tectonic Significance ◽  
North Qaidam ◽  
Back Arc

AbstractThe Zhongwunongshan Structural Belt (ZWSB) locates between the Olongbruk Microblock of North Qaidam and the South Qilian Block in China, and it has important implication for understanding the tectonic significance of North Qaidam. Nowadays, there are few discussion on the Caledonian tectonothermal events of the Zhongwunongshan Structural Belt, and there exist different opinions on provenance and tectonic environment of the Zhongwunongshan Group in the ZWSB and its adjacent North Qaidam. In this study, a comprehensive analysis of the detrital zircon geochronological research was carried out on the Zhongwunongshan Group. The detrital zircon U-Pb dating results showed two major populations. The first was Neoproterozoic (966-725 Ma) with a ∈Hf(t) = −15.9 to 9.5, and the other was late Early Paleozoic (460-434Ma) with a ∈Hf(t) = −9.6 to −3.1. In combination with previous research, the dominated provenances were found to be the Neoproterozoic granitic gneiss of the Yuqia-Shaliuhe HP-UHP metamorphic belt and the late Early Paleozoic granite of the Tanjianshan ophiolite-volcanic arc belt in North Qaidam. The Zhongwunongshan Group was deposited in the back-arc sedimentary basin related to the Caledonian collisional orogeny during Middle Silurian-Early Devonian (434-407.9 Ma).

Pre-Silurian stratigraphy and tectonic significance of the St. Croix Belt, southeastern Maine

1987 ◽  
Vol 24 (12) ◽  
pp. 2459-2469 ◽  
Author(s):  
Allan Ludman
Keyword(s):  
New Brunswick ◽  
Continental Slope ◽  
Early Paleozoic ◽  
The West ◽  
Early Devonian ◽  
Late Precambrian ◽  
Iapetus Ocean ◽  
Continental Block ◽  
Tectonic Significance ◽  
Anoxic Basin

The St. Croix Belt of southeastern Maine and southwestern New Brunswick is part of a distinctive terrane situated between the Avalon platform and Miramichi arc—two important physiographic components of the Late Precambrian – early Paleozoic Iapetus Ocean. It bears lithologic and stratigraphic similarities to both of those tracts but is identical to neither. Formerly mapped entirely as the Cookson Formation, it is now divided into four formations of Cambrian through Early Orodovician age assigned to the Cookson Group. These rocks record periodic influxes of terrigenous debris into a deep anoxic basin and may have been part of the west-facing continental slope of the Avalonian continental block. The St. Croix Belt has been strongly affected by both pre-Silurian and Early Devonian (Acadian) folding. Facies changes rather than tectonic sutures are used to explain the relationships between the St. Croix Belt and its neighbouring pre-Silurian tracts.

scholarly journals The birth of the Alps: Ediacaran to Paleozoic accretionary processes and crustal growth along the northern Gondwana margin

2021 ◽  
Author(s):  
S. Siegesmund ◽  
S. Oriolo ◽  
B. Schulz ◽  
T. Heinrichs ◽  
M. A. S. Basei ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Tectonic Evolution ◽  
Early Paleozoic ◽  
Metasedimentary Rocks ◽  
Pan African ◽  
Icp Ms ◽  
Gondwana Margin ◽  
Moldanubian Unit ◽  
Metaigneous Rocks ◽  
Back Arc

AbstractNew whole-rock geochemical and coupled U–Pb and Lu–Hf LA-ICP-MS zircon data of metasedimentary rocks of the Austroalpine, South Alpine and Penninic basement domains are presented, to disentangle the pre-Variscan tectonic evolution of the proto-Alps. The studied units seem to record distinct stages of protracted Late Ediacaran to Carboniferous tectonosedimentary processes prior to the Variscan collision. In the case of Austroalpine and South Alpine units, nevertheless, no major differences in terms of provenance are observed, since most detrital zircon samples are characterized by a major Pan-African peak. Their detrital zircon spectra record a provenance from the northeastern Saharan Metacraton and the Sinai basement at the northern Arabian-Nubian Shield, being thus located along the eastern Early Paleozoic northern Gondwana margin, whereas sources located further west are inferred for the Penninic Unit, which might have been placed close to the Moldanubian Unit of the Bohemian Massif. In any case, it is thus clear that the Alpine basement remained in a close position to the Gondwana mainland at least during the Early Paleozoic. The Late Ediacaran to Silurian tectonic evolution, which includes Cadomian and Cenerian tectonometamorphic and magmatic processes, seem thus to record a continuum related to a retreating-mode accretionary orogen, with diachronous back-arc basin opening and possibly discrete compressional/transpressional pulses linked to changes in subduction zone dynamics. On the other hand, it is inferred that the Alpine basement essentially comprises Pan-African metasedimentary and subordinate metaigneous rocks, possibly with very few Early Neoproterozoic relics. This basement was significantly reworked during the protracted Paleozoic orogenic evolution, due to anatexis and/or assimilation by mantle-derived juvenile magmatism.

Granitic Magmatism in the North Qaidam Early Paleozoic Ultrahigh-Pressure Metamorphic Belt, Northwest China

2006 ◽  
Vol 48 (3) ◽  
pp. 223-240 ◽  
Author(s):  
Wu Cailai ◽  
Joseph L. Wooden ◽  
Yang Jingsui ◽  
Paul T. Robinson ◽  
Zheng Lingsen ◽  
...  
Keyword(s):  
Northwest China ◽  
Ultrahigh Pressure ◽  
Early Paleozoic ◽  
Metamorphic Belt ◽  
The North ◽  
Granitic Magmatism ◽  
North Qaidam

DETRITAL ZIRCON PROVENANCE OF THE EARLY PALEOZOIC ARENITES OF THE LAURENTIAN MIDCONTINENT

2018 ◽  
Author(s):  
David H. Malone ◽  
◽  
Alex Konstantinou ◽  
John P. Craddock
Keyword(s):  
Detrital Zircon ◽  
Early Paleozoic

scholarly journals Petrogenesis and Tectonic Significance of the ~276 Ma Baixintan Ni-Cu Ore-Bearing Mafic-Ultramafic Intrusion in the Eastern Tianshan Orogenic Belt, NW China

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 348
Author(s):  
Minxin You ◽  
Wenyuan Li ◽  
Houmin Li ◽  
Zhaowei Zhang ◽  
Xin Li
Keyword(s):  
Orogenic Belt ◽  
Olivine Gabbro ◽  
Early Permian ◽  
Eastern Tianshan ◽  
Nw China ◽  
Tianshan Orogenic Belt ◽  
Tectonic Significance ◽  
Ultramafic Intrusion ◽  
Back Arc ◽  
Duke Island

The Baixintan mafic-ultramafic intrusion in the Dananhu-Tousuquan arc of the Eastern Tianshan orogenic belt is composed of lherzolite, olivine gabbro, and gabbro. Olivine gabbros contain zircon grains with a U-Pb age of 276.8 ± 1.1 Ma, similar to the ages of other Early Permian Ni-Cu ore-bearing intrusions in the region. The alkaline-silica diagrams, AFM diagram, together with the Ni/Cu-Pd/Ir diagram, indicate that the parental magmas for the Baixintan intrusion were likely high-Mg tholeiitic basaltic in composition. The Cu/Pd ratios, the relatively depleted PGEs and the correlations between them demonstrate that the parental magmas had already experienced sulfide segregation. The lower CaO content in pyroxenites compared with the Duke Island Alaskan-type intrusion and the composition of spinels imply that Baixintan is not an Alaskan-type intrusion. By comparing the Baixintan intrusion with other specific mafic-ultramafic intrusions, this paper considers that the mantle source of the Baixintan intrusion is metasomatized by subduction slab-derived fluids’ components, which gives rise to the negative anomalies of Nb, Ti, and Ta elements. Nb/Yb-Th/Yb, Nb/Yb-TiO2/Yb, and ThN-NbN plots show that the Baixintan intrusion was emplaced in a back-arc spreading environment and may be related to a mantle plume.

Hydrothermal circulation in an anisotropic sedimentary basin: Application to the Okinawa Back Arc Basin

1990 ◽  
Vol 95 (B12) ◽  
pp. 19175 ◽  
Author(s):  
Pierre Genthon ◽  
Michel Rabinowicz ◽  
Jean Paul Foucher ◽  
Jean Claude Sibuet
Keyword(s):  
Sedimentary Basin ◽  
Hydrothermal Circulation ◽  
Back Arc

scholarly journals Early Paleozoic Ocean in the North Qaidam: Constraints from Kaipinggou Ophiolite

2020 ◽  
Vol 94 (S1) ◽  
pp. 6-6
Author(s):  
Danling CHEN ◽  
Xiaohui ZHU ◽  
Yunfei REN ◽  
Yu TUO
Keyword(s):  
Early Paleozoic ◽  
The North ◽  
North Qaidam

scholarly journals Early Paleozoic rifting and reactivation of a passive-margin rift: Insights from detrital zircon provenance signatures of the Potsdam Group, Ottawa graben: Comment

2019 ◽  
Vol 131 (3-4) ◽  
pp. 695-698
Author(s):  
Ed Landing ◽  
Osman Salad Hersi ◽  
Lisa Amati ◽  
Stephen R. Westrop ◽  
David A. Franzi
Keyword(s):  
Detrital Zircon ◽  
Passive Margin ◽  
Early Paleozoic
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