Mesoproterozoic (∼1.3 Ga) S–type granites in Shangdu area, Inner Mongolia of the North China Craton (NCC): Implications for breakup of the NCC from the Columbia supercontinent

Li, Changhai; Liu, Zhenghong; Xu, Zhongyuan; Dong, Xin; Jin, Liu; Cheng, Yusong

doi:10.1016/j.precamres.2021.106515

Cited by 3 publications

(2 citation statements)

References 108 publications

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“…1.30 Ga magmatism along the northern margin of the NCC includes dolerite dykes and sills in the eastern part of the Yanliao rift, the Shangdu-Huade-Kangbao granite, and the Baiyun Obo carbonatite. Dolerite sills (1.33-1.30 Ga) associated with continental rifting have intruded the Shimaling, Tieling, Wumoushan, and Gaoqizhuang formations in the northern NCC [5,9,14]. In addition, 1.3 Ga carbonatite and mafic dykes occur in the Baiyun Obo area.…”

Section: Tectonic Settingmentioning

confidence: 99%

“…Over the past two decades, this field has become an important area of research [1,2]. Geological records indicate the past occurrence of at least four supercontinents: Kenorland, Columbia, Rodinia, and Pangaea [3][4][5]. The Columbia supercontinent was assembled by a series of global-scale collisional events during 2.1-1.8 Ga [6,7] and was subsequently affected by rifting from the Paleoproterozoic to Mesoproterozoic (1.8-1.3 Ga), followed by break-up at 1.3-1.2 Ga [2,6].…”

Section: Introductionmentioning

confidence: 99%

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Mesoproterozoic (ca. 1.3 Ga) A-Type Granites on the Northern Margin of the North China Craton: Response to Break-Up of the Columbia Supercontinent

Liu,

Jin,

Tian

et al. 2024

Minerals

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Mesoproterozoic (ca. 1.3 Ga) magmatism in the North China Craton (NCC) was dominated by mafic intrusions (dolerite sills) with lesser amounts of granitic magmatism, but our lack of knowledge of this magmatism hinders our understanding of the evolution of the NCC during this period. This study investigated porphyritic granites from the Huade–Kangbao area on the northern margin of the NCC. Zircon dating indicates the porphyritic granites were intruded during the Mesoproterozoic between 1285.4 ± 2.6 and 1278.6 ± 6.1 Ma. The granites have high silica contents (SiO2 = 63.10–73.73 wt.%), exhibit alkali enrichment (total alkalis = 7.71–8.79 wt.%), are peraluminous, and can be classified as weakly peraluminous A2-type granites. The granites have negative Eu anomalies (δEu = 0.14–0.44), enrichments in large-ion lithophile elements (LILEs; e.g., K, Rb, Th, and U), and depletions in high-field-strength elements (HFSEs; e.g., Nb, Ta, and Ti). εHf(t) values range from –6.43 to +2.41, with tDM2 ages of 1905–2462 Ma, suggesting the magmas were derived by partial melting of ancient crustal material. The geochronological and geochemical data, and regional geological features, indicate the Mesoproterozoic porphyritic granites from the northern margin of the NCC formed in an intraplate tectonic setting during continental extension and rifting, which represents the response of the NCC to the break-up of the Columbia supercontinent.

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Section: Tectonic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mesoproterozoic (ca. 1.3 Ga) A-Type Granites on the Northern Margin of the North China Craton: Response to Break-Up of the Columbia Supercontinent

Liu,

Jin,

Tian

et al. 2024

Minerals

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Detrital zircon U–Pb ages for the lower Cambrian Mantou Formation in Liaoning, northeastern China: Implications for sediment provenance and the early Palaeozoic palaeogeographic position of the North China Craton with respect to East Gondwana

Liu

Dong

Liu

et al. 2023

Geosystems and Geoenvironment

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Configuration of Carbonatite Constrained in Preintrusion Transpositional Foliation in the Bayan Obo Giant Rare Earth Element Deposit, China

Zhang,

Fan,

Xiao

et al. 2024

Economic Geology

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The Bayan Obo ore deposit is the largest rare earth element (REE) deposit in the world and has been assumed to be hosted in dolomite that was folded in a syncline. This has been challenged by results from drill holes and low-resistivity, controlled-source audio-frequency magnetotellurics (CSAMT) survey. In this paper, we present structural analysis of clastic sedimentary rocks from around the deposit, their relationship with carbonatite, and the orientations of the carbonatite bodies and dikes to constrain the possible configuration of carbonatite. Clastic sedimentary rocks underwent mylonitic deformation to slate, metasandstone, and metaconglomerate, displaying dramatic changes of thickness along strike. Slates locally preserve intrafolial folds and hook folds bounded by foliations; metasandstones have parallel layers of recrystallized and preferred-orientated quartz aggregations; metaconglomerates contain flattened pebbles with Flinn k values of 0.01 to 0.05 and 0. The above structures and foliations were crosscut and intruded by carbonatite and associated fenite, demonstrating preintrusion transposition of original bedding to steep foliation. Preintrusion foliation provides zones of weakness that were exploited by upwelling of carbonatite magma. Northeast-SW–striking left-stepping en echelon carbonatite dikes and E-W–striking carbonatite bodies indicate that the carbonatite was emplaced in a sinistral transtensional zone. The northern and southern segments of the carbonatite bodies are parallel to the steep foliation at shallow depths and merge together at depth, constraining a Y-shaped configuration, consistent with the low resistivity result of the CSAMT survey. The newly recognized Y-shaped morphology indicates that the carbonatite extends deeper than 1,775.4 m, more than twice the previously inferred maximum depth of the syncline model, and contributes to a significant >1.78 times increase in global potential RE2O3 resources than previously estimated in 2021.

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Mesoproterozoic (∼1.3 Ga) S–type granites in Shangdu area, Inner Mongolia of the North China Craton (NCC): Implications for breakup of the NCC from the Columbia supercontinent

Cited by 3 publications

References 108 publications

Mesoproterozoic (ca. 1.3 Ga) A-Type Granites on the Northern Margin of the North China Craton: Response to Break-Up of the Columbia Supercontinent

Mesoproterozoic (ca. 1.3 Ga) A-Type Granites on the Northern Margin of the North China Craton: Response to Break-Up of the Columbia Supercontinent

Detrital zircon U–Pb ages for the lower Cambrian Mantou Formation in Liaoning, northeastern China: Implications for sediment provenance and the early Palaeozoic palaeogeographic position of the North China Craton with respect to East Gondwana

Configuration of Carbonatite Constrained in Preintrusion Transpositional Foliation in the Bayan Obo Giant Rare Earth Element Deposit, China

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