Geochronological, geochemical and Sr–Nd isotopic fingerprinting of Neoproterozoic mafic dykes in the western margin of the Yangtze Block, SW China: Implications for Rodinia supercontinent breakup

Li, Hongbo; Zhang, Zhaochong; Santosh, M.; Li, Yongsheng; Liu, Han; Zhu, Jiang; Pan, Ronghao

doi:10.1016/j.precamres.2019.105371

Cited by 11 publications

(3 citation statements)

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“…Mafic and felsic intrusions of Late Paleoproterozoic to Mesoproterozoic age (~1.7-1.5 Ga) occur within the belt [39,[59][60][61][62][63], show geochemical affinities of intra-plate magmatism, and are considered to have formed in a continental rift setting [7,39]. In addition, extensive tectonic-magmatic activity occurred at ~960-740 Ma, which was almost simultaneous with regional metamorphism, and produced a variety of intrusive rocks comprising diabase, gabbros, diorites and granites in the Kangdian copper belt [38,53,[64][65][66][67][68][69]. These Neoproterozoic plutons have been interpreted as either subduction-related [53,64,66,67] or mantle plume-related [65,68,69], of which the two largest granitic bodies are the Eshan pluton (819 ± 8 Ma [65]) and the Yuanmou pluton (746 ± 13 Ma [64]).…”

Section: Regional Geologymentioning

confidence: 99%

“…In addition, extensive tectonic-magmatic activity occurred at ~960-740 Ma, which was almost simultaneous with regional metamorphism, and produced a variety of intrusive rocks comprising diabase, gabbros, diorites and granites in the Kangdian copper belt [38,53,[64][65][66][67][68][69]. These Neoproterozoic plutons have been interpreted as either subduction-related [53,64,66,67] or mantle plume-related [65,68,69], of which the two largest granitic bodies are the Eshan pluton (819 ± 8 Ma [65]) and the Yuanmou pluton (746 ± 13 Ma [64]).…”

Section: Regional Geologymentioning

confidence: 99%

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Sulfide Rb-Sr, Re-Os and In Situ S Isotopic Constraints on Two Mineralization Events at the Large Hongnipo Cu Deposit, SW China

et al. 2020

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The Hongnipo deposit, a newly discovered large copper deposit in the Kangdian copper belt, SW China, is hosted in the Paleoproterozoic Hekou Group. This deposit contains ~4200 Mt of Cu ores, with an average grade of 1.42 wt.% Cu. Orebodies occur mainly as stratiform, stratoid and lenticular forms. Mineralization consists predominantly of high grade vein-type ores and low grade laminated ores. Field relationships indicate vein-type mineralization crosscuts laminated mineralization and host rocks, indicating that there were at least two mineralization events during the formation of the deposit. Pyrite separates from the laminated ores yield a Rb-Sr isochron age of 1552 ± 80 Ma, with a highly radiogenic initial 87Sr/86Sr ratio of 0.71214 ± 0.00081, indicating a major contribution from the ore-hosting rocks. Sulfides from the laminated ores have δ34S values ranging from −1.8‰ to 11.4‰, with the vast majority in the range of 5.3‰ to 11.4‰, suggesting the mixed derivation of sulfur from seawater sulfates and magmatic fluids. Chalcopyrite separates from the vein-type ores have a Re-Os isochron age of 794.8 ± 7.9 Ma. The initial 187Os/188Os (2.8 ± 1.2) and γOs (+2202) values are slightly lower than the average values of continental crust, indicating a major metal source of the Hekou Group with minor mantle input. Sulfides from the vein-type ores have δ34S values that range from −10.3‰ to 4.0‰ and cluster between 0‰ to 2.2‰, which implies a significant contribution of magmatic-sourced sulfur with minor biogenic sulfur. Two major mineralization events have been identified. The Rb-Sr age of the laminated ores likely records a VMS mineralization event at ~1.6 Ga. The much younger Re-Os age is considered to represent the timing of an important mineralization event, which is likely related to the Neoproterozoic magmatism and/or metamorphism and represents a newly documented mineralization event to be targeted by exploration.

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Section: Regional Geologymentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Sulfide Rb-Sr, Re-Os and In Situ S Isotopic Constraints on Two Mineralization Events at the Large Hongnipo Cu Deposit, SW China

et al. 2020

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“…In recent years, numerous researchers have reported evidence of the involvement of the Yangtze Plate in the amalgamation and breakup of supercontinents such as Columbia, Rodinia, Gondwana, and Pangea. This evidence encompasses intense activity in terms of tectonic, magmatic, and metamorphic events, as well as paleomagnetic data [1][2][3][4][5][6][7]. During the Early Neoproterozoic, volcano-sedimentary rock sequences such as the Suxiong and Xiaoxiangling Formations, which developed around the periphery of the Yangtze Craton, were products of continental rifting and marked the onset of the breakup of the Rodinia supercontinent [8].…”

Section: Introductionmentioning

confidence: 99%

U–Pb Dating of Fibrous Dolomite in the Hydrothermal Dolostone of the Dengying Formation, Central Sichuan Basin, and Its Response to Supercontinent Breakup

Zheng,

Wen,

et al. 2023

Minerals

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Super-deep drilling in the central Sichuan Basin encountered volcanic rocks of the Suxiong Formation, which are overlain by multiple hydrothermal alterations within the upper section of the Ediacaran Dengying Formation. This provides an excellent research opportunity to understand the pre-Cambrian hydrothermal activity and geological evolution of the western margin of the Yangtze Craton. Observations revealed the development of a series of hydrothermal dolomite aggregates characterized by the presence of brown sphalerite within fractures and pores of the carbonate rock. Microscopically, the dolomite exhibited fibrous columnar crystallization, forming radial bands with a gradual decrease in crystallization intensity from the center to the periphery. Cathodoluminescence analysis revealed the presence of approximately eight dolomite bands within the aggregate. U–Pb dating from the inner to outer bands yielded isotopic ages of 781 ± 12 Ma for the second band, 683 ± 12 Ma for the fifth, 562 ± 12 Ma for the sixth, and 545.4 ± 6.9 Ma for the seventh. The in situ rare earth element (REE) distribution patterns of the 781 and 683 Ma dolomite bands exhibited similarities. They both showed low total REE content (∑REE), with significant fractionation between light and heavy REEs. Additionally, they exhibited negative anomalies in cerium (Ce) and europium (Eu), while heavy REEs were relatively enriched. The dolomite bands at 562 and 545 Ma also exhibited similar REE characteristics, with low ∑REE and weak fractionation between light and heavy REEs. They also displayed distinct negative anomalies in Ce and Eu, indicating similar distribution patterns. These findings suggested that formation of the banded hydrothermal dolostone occurred during different tectonic events, and the presence of heavy REE-enriched hydrothermal fluids suggested a deep-seated origin. This study has provided preliminary evidence that the Dengying Formation, previously considered to be of the Ediacaran age, has undergone multiple episodes of deep-seated fluid infiltration and alteration since the Mesoproterozoic Era. Importantly, these events coincide with the rifting of the Rodinia and Pannotia supercontinents, aligning with their respective timeframes. This finding raises questions regarding the stratigraphic division and correlation of the formations in the deeply buried core area of the basin.

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The Precambrian drift history and paleogeography of the Chinese cratons

Zhang¹,

Chang²,

Zhao³

et al. 2021

Ancient Supercontinents and the Paleogeography of Earth

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Geochronological, geochemical and Sr–Nd isotopic fingerprinting of Neoproterozoic mafic dykes in the western margin of the Yangtze Block, SW China: Implications for Rodinia supercontinent breakup

Cited by 11 publications

References 88 publications

Sulfide Rb-Sr, Re-Os and In Situ S Isotopic Constraints on Two Mineralization Events at the Large Hongnipo Cu Deposit, SW China

Sulfide Rb-Sr, Re-Os and In Situ S Isotopic Constraints on Two Mineralization Events at the Large Hongnipo Cu Deposit, SW China

U–Pb Dating of Fibrous Dolomite in the Hydrothermal Dolostone of the Dengying Formation, Central Sichuan Basin, and Its Response to Supercontinent Breakup

The Precambrian drift history and paleogeography of the Chinese cratons

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