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Article: Late Neoarchean TTG and monzogranite in the northeastern North China Craton: Implications for partial melting of a thickened lower crust

TitleLate Neoarchean TTG and monzogranite in the northeastern North China Craton: Implications for partial melting of a thickened lower crust
Authors
KeywordsNeoarchean geodynamic regime
North China Craton
Thermodynamic partial melting modeling
Thickened lower crust
TTG
Issue Date2023
Citation
Gondwana Research, 2023, v. 115, p. 201-223 How to Cite?
AbstractThe petrogenesis and dynamic setting of Archean tonalite–trondhjemite–granodiorite (TTG) is widely debated. As a typical Archean terrane in the northeastern North China Craton (NCC), the southern Jilin Province area underwent multi-stage magmatism during the Neoarchean and is therefore a promising region in which to track the Neoarchean evolution of the NCC. This study investigates the petrogenesis of late Neoarchean TTGs and associated monzogranites and their tectonic implications. Zircon U–Pb dating results suggest that the TTGs and monzogranites have emplacement ages of 2.55–2.52 and 2.53–2.51 Ga, respectively. The TTGs have variable SiO2 (61.7–73.3 wt%) and MgO (0.66–2.74 wt%) contents and Mg# values of 33–50. Most have high Sr and low Y and Yb contents, with high Sr/Y and (La/Yb)N ratios. The TTGs have variable εHf(t) (+0.7 to + 8) and εNd(t) (−2.77 to + 2.79) values. These characteristics, together with the results of thermodynamic partial-melting modelling, indicate that the TTGs can be classified as medium- and low- pressure types and were likely generated by amphibole-breakdown partial melting of 2.9–2.7 Ga juvenile basaltic rocks under P–T conditions of 1.0 ± 0.1 GPa and 880 ± 50 °C. The monzogranites have higher SiO2 (66.1–76.0 wt%) and K2O (4.03–5.06 wt%) and lower TFe2O3 (0.89–4.97 wt%) and MgO (0.21–1.27 wt%) contents. They also have high Sr/Y and (La/Yb)N ratios and variable εHf(t) (+0.6 to + 5.4) and εNd(t) (−3.47 to − 0.15) values. The geochemical and Hf–Nd isotopic compositions of the monzogranites indicate that the parental magmas may have been derived through the partial melting of thickened lower crust with heterogeneous sources. The high thermal gradient (>730 °C/GPa−1), anticlockwise metamorphic P–T paths, and 3.4–3.2 Ga remanent zircons in the region suggest that a late Neoarchean thickened lower crust was the likely geodynamic setting for the generation of the TTGs and monzogranites.
Persistent Identifierhttp://hdl.handle.net/10722/327441
ISSN
2023 Impact Factor: 7.2
2023 SCImago Journal Rankings: 1.742
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, Zhongshui-
dc.contributor.authorShan, Xuanlong-
dc.contributor.authorLiu, Jin-
dc.contributor.authorZhang, Jian-
dc.contributor.authorLiu, Zhenghong-
dc.contributor.authorCheng, Changquan-
dc.contributor.authorWang, Zhigao-
dc.contributor.authorZhao, Chen-
dc.contributor.authorYu, Hongchao-
dc.date.accessioned2023-03-31T05:31:21Z-
dc.date.available2023-03-31T05:31:21Z-
dc.date.issued2023-
dc.identifier.citationGondwana Research, 2023, v. 115, p. 201-223-
dc.identifier.issn1342-937X-
dc.identifier.urihttp://hdl.handle.net/10722/327441-
dc.description.abstractThe petrogenesis and dynamic setting of Archean tonalite–trondhjemite–granodiorite (TTG) is widely debated. As a typical Archean terrane in the northeastern North China Craton (NCC), the southern Jilin Province area underwent multi-stage magmatism during the Neoarchean and is therefore a promising region in which to track the Neoarchean evolution of the NCC. This study investigates the petrogenesis of late Neoarchean TTGs and associated monzogranites and their tectonic implications. Zircon U–Pb dating results suggest that the TTGs and monzogranites have emplacement ages of 2.55–2.52 and 2.53–2.51 Ga, respectively. The TTGs have variable SiO2 (61.7–73.3 wt%) and MgO (0.66–2.74 wt%) contents and Mg# values of 33–50. Most have high Sr and low Y and Yb contents, with high Sr/Y and (La/Yb)N ratios. The TTGs have variable εHf(t) (+0.7 to + 8) and εNd(t) (−2.77 to + 2.79) values. These characteristics, together with the results of thermodynamic partial-melting modelling, indicate that the TTGs can be classified as medium- and low- pressure types and were likely generated by amphibole-breakdown partial melting of 2.9–2.7 Ga juvenile basaltic rocks under P–T conditions of 1.0 ± 0.1 GPa and 880 ± 50 °C. The monzogranites have higher SiO2 (66.1–76.0 wt%) and K2O (4.03–5.06 wt%) and lower TFe2O3 (0.89–4.97 wt%) and MgO (0.21–1.27 wt%) contents. They also have high Sr/Y and (La/Yb)N ratios and variable εHf(t) (+0.6 to + 5.4) and εNd(t) (−3.47 to − 0.15) values. The geochemical and Hf–Nd isotopic compositions of the monzogranites indicate that the parental magmas may have been derived through the partial melting of thickened lower crust with heterogeneous sources. The high thermal gradient (>730 °C/GPa−1), anticlockwise metamorphic P–T paths, and 3.4–3.2 Ga remanent zircons in the region suggest that a late Neoarchean thickened lower crust was the likely geodynamic setting for the generation of the TTGs and monzogranites.-
dc.languageeng-
dc.relation.ispartofGondwana Research-
dc.subjectNeoarchean geodynamic regime-
dc.subjectNorth China Craton-
dc.subjectThermodynamic partial melting modeling-
dc.subjectThickened lower crust-
dc.subjectTTG-
dc.titleLate Neoarchean TTG and monzogranite in the northeastern North China Craton: Implications for partial melting of a thickened lower crust-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gr.2022.10.008-
dc.identifier.scopuseid_2-s2.0-85141301303-
dc.identifier.volume115-
dc.identifier.spage201-
dc.identifier.epage223-
dc.identifier.isiWOS:000913802800001-

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