Origin of mafic microgranular enclaves (MMEs) and their host …
2013年2月1日 · Mafic microgranular enclaves are commonly present in Muchen pluton, South China. The consistency of ages implies the quartz monzonites and MMEs were coeval. Mafic magmas from which the MMEs crystallised likely had a depleted mantle source. Quartz monzonites were derived from a hybrid magma due to crust–mantle interaction. The Muchen pluton was most likely generated in an extensional setting.
Geochemical characteristics of mafic and ultramafic rocks from the …
2018年3月1日 · The mafic cumulate layered gabbro and its derivatives are seen as isolated patches and hills along the course of the Tizu river and in an around the Moki village (Fig. 2 c). The mafic volcanics are interlayered and intermixed with pelagic sediments including radiolarian cherts, green and grey cherts and crystalline limestone.
Preservation of Archean mafic lower continental crust worldwide
2024年1月15日 · However, mafic granulite xenoliths from a variety of localities where no Archean rocks are exposed demonstrate that the Archean mafic lower crust is widely preserved. These examples imply that the amounts of Archean rocks may be significantly underestimated in the crustal growth curves based on the distribution of rocks of different ages ...
On the origin of high-pressure mafic granulite in the Eastern …
2022年4月1日 · The mafic granulite (samples 45-1 and 45-5) and hosting leucosome (sample 97-12) studied in this work were collected from the core of a thick (~30 m wide) layer of garnet amphibolite within migmatitic pelitic granulite (garnet-kyanite schist) in the Jiala area near the Namche Barwa peak (Fig. 1 b). The fresh granulite and garnet amphibolite ...
Configuration of the Late Paleoproterozoic supercontinent …
2008年10月1日 · The mafic dyke swarm intruded northward from the Xiong'er Aulacogen. Peng et al. (2005) interpreted the mafic dyke swarm as feeder of the Xiong'er LIPs that was emplaced in the Late Paleoproterozoic and that was related to a mantle plume beneath the Xiong'er LIPs. A plume-driven upwelling beginning at 1.84 Ga could well explain the subsequent ...
The mafic-ultramafic belt of the Argentine Precordillera: A …
2021年10月1日 · An example of such evidence is the presence of mafic-ultramafic belts interpreted as ophiolite complexes. Ophiolites represent fragments of upper mantle and oceanic crust that have been incorporated into continental margins during continent-continent or arc-continent collisions, ridge-trench interactions or subduction-accretion proc
Chemical geodynamics of mafic magmatism above subduction …
2020年6月1日 · All mafic igneous rocks with enriched geochemical signatures in interplate and intraplate areas can be categorized into two series in terms of their trace element distribution patterns (e.g., Zhao et al., 2015a, Zheng et al., 2018, Zheng, 2019). One is IAB-like series, showing enrichment in LILE, Pb and LREE but depletion in HFSE relative to HREE.
Temporal geochemical variation in early Paleozoic mafic rocks …
2023年5月5日 · The Paleozoic mafic arc igneous rocks in the Qinling orogen formed during the subduction of the Proto-Tethys ocean are characterized by arc-type trace element characteristics with enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE) but depletion in high field strength elements (HFSE), suggesting their ...
Coexisting Early Cretaceous arc-type and OIB-type mafic …
2021年11月1日 · The ε Nd (t) values for the Qukou and Yangboping mafic rocks are similar to those of other Early Cretaceous arc-type mafic rocks in the ENJO, with the latter ranging from −2.61 to 2.14 (Wang et al., 2021), but differ from those of Early Cretaceous Quzhou-Longyou mafic-ultramafic intrusions (Qi et al., 2016), Early Cretaceous mafic rocks from ...
Syn- and post-collisional mafic igneous rocks from the East Kunlun ...
2024年6月1日 · This study investigates mafic dikes from the EKOB and reports new zircon U Pb ages and Hf O isotopic compositions, as well as whole-rock major and trace element contents and Sr–Nd–Hf isotopic compositions. The studied mafic dikes are compared with other magmatic rocks from the EKOB to better understand the evolution of this orogenic belt.