Citation: | WANG Jinfang, LI Yingjie, LI Hongyang, DONG Peipei. 2021. Discovery of the Late Carboniferous adakite in the Erenhot-Hegenshan suture zone and intra-oceanic subduction of the Paleo-Asian Ocean[J]. Geology in China, 48(2): 520-535. doi: 10.12029/gc20210212 |
The Ehenaobaotu tonalite is outcropped in the northern part of the Meilaotewula SSZ-type ophiolite of the Erenhot-Hegenshan suture zone in Xi Ujimqin Banner of Inner Mongolia. Based on the study of petrology, geochemistry and zircon LA-ICP-MS U-Pb geochronology, the genetic type and tectonic setting of the tonalite were determined, and the final closure time and subduction process of the Erenhot-Hegenshan ocean basin of the Paleo-Asian Ocean were discussed. The tonalite is characterized by high SiO2, Al2O3, Na2O, Sr and low K2O, Y contents, enrichment of Rb, Ba, Sr large ion lithophile elements and LREE, and depletion of Nb, Ta, Ti, P high field strength elements and HREE. There is no pronounced Eu anomaly. The lithological and geochemical characteristics show that the Ehenaobaotu pluton is a high Si adakite (HSA) formed in island arc, and was derived from patial melting of the intra-oceanic subductingd oceanic crust and sediment and subsequently reaction with overlying mantle wedge peridotite. Its U-Pb LA-ICP-MS dating yields (305.6±1.5) Ma and suggests that the Ehenaobaotu pluton was formed during Late Carboniferous. Combined with the study of spatio-temporal evloution of the Carboniferous ophiolites and Carboniferous-Permian island arc magmatic rocks in the Erenhot-Hegenshan suture, it is assumed that the Erenhot-Hegenshan oceanic basin of the Paleo-Asian Ocean was in the process of oceanic subduction characterized by intra-oceanic subduction during the Carboniferous-Early Permian.
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Tectonic unit map (a)(modified from Miao et al., 2008), regional geological map (b), geological map(c), field photograph (d) and photomicrograph (e) of the Ehenaobaotu tonalite
Cathodoluminescent images and LA-ICP-MS U-Pb ages of zircons from the Ehenaobaotu tonalite
U-Pb concordia diagram and histograms of zircons from the Ehenaobaotu tonalite
Shand's index of the Ehenaobaotu tonalite (after Maniar and Piccoli, 1989)
Total alkalis vs. silica(TAS) classification diagram of the Ehenaobaotu tonalite (after Middlemost, 1994)
An-Ab-Or classification diagram of the Ehenaobaotu tonalite (after O'Connor, 1965)
Chondrite-normalized REE distribution patterns of the Ehenaobaotu tonalite (normalizing values after Boynton, 1984; High-SiO2 adakite after Martin et al., 2005)
Primitive mantle-normalized trace element spider diagram of the Ehenaobaotu tonalite(normalizing values after Sun and McDonough, 1989; High-SiO2 adakite after Martin et al., 2005)
Y-Sr/Y tectonic discriminant diagram of the Ehenaobaotu tonalite (after Defant and Drummond, 1990; Martin, 1999; High-SiO2 adakite after Martin et al., 2005)
SiO2-MgO, (CaO+NaO2)-Sr, Y-Sr/Y and SiO2-Nb diagrams of the Ehenaobaotu tonalite(after Martin et al., 2005)
(Y+Nb)-Rb (a) and (Yb+Ta)-Rb (b) tectonic discriminant diagrams of the Ehenaobaotu tonalite(after Pearce, 1984; High-SiO2 adakiteafter Martin et al., 2005)
Genetic and evolution model of the Ehenaobaotu tonalite and igneous petrotectonic assemblage of the Meilaotewula intra-oceanic arc