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We present the results of a geochemical and geochronological study for Late Triassic (230‒220Ma) adakitic plutons within the Archean terrane of the eastern part of the North China Craton (NCC). These plutons show adakitic signatures with high Sr, Sr/Y, (La/Yb) N , and low Cr and Ni. The enriched Nd–Hf isotopic compositions (ε Nd (t)=−13.3 to −12.9; ε Hf (t)=−17.4 to −14.6)...
Voluminous and discrete early Paleozoic bimodal magmatic suites are thought to be the result of post-collisional extension following the amalgamation of East Kunlun and Altyn Tagh. In this paper, four representative magmatic units were studied for their geochemical fingerprint in conjunction with geochronological studies. The 467–445Ma Mangya mafic suite shows E-MORB type rare earth element (REE)...
The Tibetan Plateau is the result of several collision events between a series of Gondwana-derived blocks (e.g., Qiangtang, Lhasa and India) and the Asian continent since the early Paleozoic. The occurrence of high-pressure eclogites has a significant bearing on the Paleo-Tethys subduction and plate suturing processes in this area. A quartzite, together with its host eclogite from the Jilang County...
Craton destruction is a complex process involving both chemical and physical interactions between the crust and the mantle. Several mechanisms, including thermo-chemical erosion, delamination, lithosphere extension and subducting slab dehydration, have been proposed to explain the destruction of the North China Craton (NCC). We present constraints extrapolated directly from laboratory melt–peridotite...
Petrography, mineral chemistry and pressure–temperature (P–T) estimates were carried out for the eclogite from the South Altyn in NW China. The results suggest three stages of metamorphism: an ultra-high pressure (UHP) eclogite-facies metamorphism at 717–871°C and ≥2.8GPa, a high pressure (HP) granulite-facies metamorphism at 624–789°C and 1.42–1.52GPa, and an amphibolite-facies metamorphism at 597–728°C...
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