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Article: Petrogenesis and tectonic affinity of Early Cretaceous potassic diorites in the northern Taihang Mountain, Trans-North China Orogen

TitlePetrogenesis and tectonic affinity of Early Cretaceous potassic diorites in the northern Taihang Mountain, Trans-North China Orogen
Authors
KeywordsEarly Cretaceous
Petrogenesis and geodynamic setting
Potassic diorites
Trans-North China Orogen
Whole-rock Sr–Nd–Mg isotope
Issue Date1-Dec-2022
PublisherElsevier
Citation
Journal of Asian Earth Sciences, 2022, v. 240 How to Cite?
Abstract

Mesozoic mantle-derived potassic magmatic rocks in the Trans-North China Orogen (TNCO) are important for constraining tectonic evolution. However, potassic intermediate plutons in this orogen are rarely reported in literature, despite the significance of such a potassic magmatic event being well understood. Here, we describe the petrography of the Longmen potassic diorites and present zircon U–Pb ages and elemental and Sr–Nd–Mg isotopic compositions for this pluton. The Longmen potassic diorites were emplaced during the Early Cretaceous (ca. 140 Ma), showing shoshonite features with marked depletion of high-field strength elements relative to large ion lithophile elements with a slightly negative Eu anomaly. It possesses restricted ranges of initial 87Sr/86Sr ratios (0.70592 to 0.70667), εNd(t) values (−15.86 to −13.26), and low δ26Mg (−0.37 to −0.26‰). Low-degree partial melting of the ancient and enriched mantle, characterised by amphibole-bearing lherzolite in the spinel–garnet transition zone, was the likely mantle source of the evaluated Longmen potassic diorites, resulting from fluid-related metasomatism and upwelling mantle (carbonated) peridotite. Minor crustal materials were present in the lithospheric mantle because of Eastern Block and Western Block subduction/collision during the Paleoproterozoic. Based on our data and previous studies, slab sinking and rollback of the Izanagi plate (Paleo-Pacific plate) may have created an ancient, enriched mantle beneath the East Asian continent, inducing lithospheric thinning and heterogeneity of the lithospheric mantle in the North China Craton and lithospheric extension via thermo-mechanical erosion at 145–110 Ma in the TNCO.


Persistent Identifierhttp://hdl.handle.net/10722/331767
ISSN
2023 Impact Factor: 2.7
2023 SCImago Journal Rankings: 0.964
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTang, ZY-
dc.contributor.authorZhao, GC-
dc.contributor.authorZhang, MX-
dc.contributor.authorSun, DY-
dc.contributor.authorZhang, CL-
dc.contributor.authorZhang, SJ-
dc.contributor.authorSun, GS-
dc.contributor.authorZhang, ZF-
dc.contributor.authorShao, C-
dc.contributor.authorYang, YC-
dc.contributor.authorLiu, C-
dc.contributor.authorWang, XP-
dc.date.accessioned2023-09-21T06:58:44Z-
dc.date.available2023-09-21T06:58:44Z-
dc.date.issued2022-12-01-
dc.identifier.citationJournal of Asian Earth Sciences, 2022, v. 240-
dc.identifier.issn1367-9120-
dc.identifier.urihttp://hdl.handle.net/10722/331767-
dc.description.abstract<p>Mesozoic mantle-derived potassic magmatic rocks in the Trans-North China Orogen (TNCO) are important for constraining tectonic evolution. However, potassic intermediate plutons in this orogen are rarely reported in literature, despite the significance of such a potassic magmatic event being well understood. Here, we describe the petrography of the Longmen potassic <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/diorite" title="Learn more about diorites from ScienceDirect's AI-generated Topic Pages">diorites</a> and present zircon U–Pb ages and elemental and Sr–Nd–Mg isotopic compositions for this pluton. The Longmen potassic diorites were emplaced during the Early Cretaceous (ca. 140 Ma), showing shoshonite features with marked depletion of high-field strength elements relative to large ion lithophile elements with a slightly negative Eu anomaly. It possesses restricted ranges of initial <sup>87</sup>Sr/<sup>86</sup>Sr ratios (0.70592 to 0.70667), ε<sub>Nd</sub>(t) values (−15.86 to −13.26), and low δ<sup>26</sup>Mg (−0.37 to −0.26‰). Low-degree partial melting of the ancient and enriched mantle, characterised by amphibole-bearing lherzolite in the spinel–garnet transition zone, was the likely mantle source of the evaluated Longmen potassic diorites, resulting from fluid-related metasomatism and upwelling mantle (carbonated) <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/peridotite" title="Learn more about peridotite from ScienceDirect's AI-generated Topic Pages">peridotite</a>. Minor crustal materials were present in the lithospheric mantle because of Eastern Block and Western Block subduction/collision during the Paleoproterozoic. Based on our data and previous studies, slab sinking and rollback of the Izanagi plate (Paleo-Pacific plate) may have created an ancient, enriched mantle beneath the East Asian continent, inducing lithospheric thinning and heterogeneity of the lithospheric mantle in the North China <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/craton" title="Learn more about Craton from ScienceDirect's AI-generated Topic Pages">Craton</a> and lithospheric extension via thermo-mechanical erosion at 145–110 Ma in the TNCO.</p>-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofJournal of Asian Earth Sciences-
dc.subjectEarly Cretaceous-
dc.subjectPetrogenesis and geodynamic setting-
dc.subjectPotassic diorites-
dc.subjectTrans-North China Orogen-
dc.subjectWhole-rock Sr–Nd–Mg isotope-
dc.titlePetrogenesis and tectonic affinity of Early Cretaceous potassic diorites in the northern Taihang Mountain, Trans-North China Orogen-
dc.typeArticle-
dc.identifier.doi10.1016/j.jseaes.2022.105441-
dc.identifier.scopuseid_2-s2.0-85140341871-
dc.identifier.volume240-
dc.identifier.eissn1878-5786-
dc.identifier.isiWOS:000878417200002-
dc.identifier.issnl1367-9120-

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