Neoarchean granite-greenstone belts and related ore mineralization in the North China Craton: An overview
نویسندگان
چکیده
منابع مشابه
Upper crust of the Pilbara Craton, Australia; 3D geometry of a granite/greenstone terrain
The Pilbara Craton in Northwest Australia is a 600×550 km region of early-mid Archaean granite/greenstone terrain, dominated by granite domes, and in part covered by younger rocks. Gravity and magnetic anomalies are used to map the granite/greenstone surface under cover, and infer the depth extent of the granite/greenstone structures. A published seismic refraction interpretation gives a two la...
متن کاملReactivation of an Archean craton: Constraints from P- and S-wave tomography in North China
[1] The unusual reactivation of the North China Craton (NCC) challenges the classical views concerning the strength and stability of cratonic lithosphere. By using teleseismic body-waves recorded at 250 seismic stations, this paper presents high-resolution North China Models of Pand S-wave velocity based on finite-frequency kernel tomography. Both Pand S-wave velocity models reveal that: (1) an...
متن کاملPaleoproterozoic high-pressure metamorphism in the northern North China Craton and implications for the Nuna supercontinent
The connection between the North China Craton (NCC) and contiguous cratons is important for the configuration of the Nuna supercontinent. Here we document a new Paleoproterozoic high-pressure (HP) complex dominated by garnet websterite on the northern margin of the NCC. The peak metamorphism of the garnet websterite was after ∼1.90 Ga when it was subducted to eclogite facies at ∼2.4 GPa, then e...
متن کاملRecycling deep cratonic lithosphere and generation of intraplate magmatism in the North China Craton
Early Cretaceous alkaline picrites and high-magnesium basalts from the North China craton provide evidence for recycling of continental lithosphere by density foundering. Both the picrites and basalts contain xenocrystic olivines with high Fo92-93 and low CaO (<0.10%), consistent with the lavas’ derivation from, or interaction with Archean mantle lithosphere. Most importantly, both the picritic...
متن کاملRecycled crust controls contrasting source compositions of Mesozoic and Cenozoic basalts in the North China Craton
We explore Fe/Mn and Nb/Ta ratios of basalts as potential tracers for differentiating melts of recycled mafic crustal lithologies from peridotitic melts. Trace elements and Fe/Mn ratios of the Mesozoic and Cenozoic basalts from East China were analyzed by ICP-MS. Low Nb/Ta ratios (15.4 ± 0.3 (2r, n = 45)), high Nb and Ta contents (60.1 and 4.01 ppm) and high Fe/ Mn ratios (64.7 ± 1.5 (2r, n = 4...
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ژورنال
عنوان ژورنال: Geoscience Frontiers
سال: 2018
ISSN: 1674-9871
DOI: 10.1016/j.gsf.2017.04.002