Compositions of cumulates in lower oceanic crust and implications for ophiolite studies

Zhang, Weiqi; ChuanZhou, LIU; Liu, Tong

doi:10.18654/1000-0569/2022.06.06

Cited by 3 publications

(2 citation statements)

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“…Clinopyroxenes in the ductile shear zone are homogeneous and all within the range of clinopyroxenes in the foliated gabbros (Figures 4a and 4b). Overall, clinopyroxenes in the Refahiye gabbro dikes are relatively primitive with respect to those in global abyssal gabbros (W. Q. Zhang, Liu, & Liu, 2022) and follow the fractional crystallization trend (Coogan, 2014) (Figures 4a and 4b). Plagioclases in the Refahiye gabbros are of anorthitic composition with An contents [ = 100 × Ca/(Ca + Na]] of 91–96, whereas those in the diabase dikes have lower and more variable Ancontents of 2–49 (Figure 4c).…”

Section: Resultsmentioning

confidence: 99%

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Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Liu,

et al. 2024

Geochem Geophys Geosyst

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Subduction initiation in oceans is key to understanding regional and global plate tectonics and ocean basin dynamics; however, its genetic mechanism is still enigmatic. The most famous model that predicts intraoceanic subduction initiation along transform faults or fracture zones (i.e., the Subduction Initiation Rule) has been widely used to explain arc‐like geochemical signatures within the Neo‐Tethyan ophiolites, but fails to account for the speculation and/or calculation of a sub‐parallel relationship between the Jurassic subduction zones and paleo ridges of the western Neo‐Tethys. Here, we propose a ridge‐parallel detachment fault‐hosted subduction re‐initiation model for the Jurassic western Neo‐Tethys. Based on field geological and geochemical evidence, we show that the Refahiye ophiolite in the İzmir–Ankara–Erzincan suture of northern Turkey has diagnostic characteristics indicative of (ultra)slow seafloor spreading. An (ultra)slow‐spreading nature also characterizes many Neo‐Tethyan ophiolites from the Alps to Southeast Asia, either at mid‐ocean ridges or in suprasubduction zones. Due to its extremely weak nature, detachment faults were probably a key candidate for the Jurassic intraoceanic subduction re‐initiation of the western Neo‐Tethys in response to far‐field compression after its long‐lived northward subduction. This model is applicable to both the Jurassic and Early Cretaceous ophiolites, but is questionable for the Late Cretaceous ophiolites. Its utility deponds on the kinematics of ancient plate boundaries and compositions of ophiolites. The detachment fault‐hosted subduction re‐initiation model can explain the arc‐like geochemical features of the Jurassic western Neo‐Tethyan ophiolites, but its effect on the structure and component of ophiolites is diverse.

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Section: Resultsmentioning

confidence: 99%

“… Mineral major element compositions of the gabbro and diabase dikes of the Refahiye ophiolite. (a, b) Data for global abyssal gabbros is after the compilation of W. Q. Zhang, Liu, and Liu (2022), and the fractional crystallization trend is after Coogan (2014). (c) Data for plagioclases in the Hole 735B gabbros is from Dick et al.…”

Section: Resultsmentioning

confidence: 99%

Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Liu,

et al. 2024

Geochem Geophys Geosyst

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Multi-stage melt impregnation and magma–seawater interaction in a slow-spreading oceanic lithosphere: constraints from cumulates in the Lagkorco ophiolite (central Tibet)

Zhang

ChuanZhou

Liu

et al. 2022

Contrib Mineral Petrol

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Dynamics of the oceanic dike–gabbro transition revealed by petrology and geochemistry of the Yunzhug ophiolite, central Tibet

Liu,

Zhang

et al. 2024

Contrib Mineral Petrol

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Compositions of cumulates in lower oceanic crust and implications for ophiolite studies

Cited by 3 publications

References 0 publications

Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Detachment Fault‐Hosted Subduction Re‐Initiation of the (Ultra)Slow‐Spreading Western Neo‐Tethys in the Jurassic

Multi-stage melt impregnation and magma–seawater interaction in a slow-spreading oceanic lithosphere: constraints from cumulates in the Lagkorco ophiolite (central Tibet)

Dynamics of the oceanic dike–gabbro transition revealed by petrology and geochemistry of the Yunzhug ophiolite, central Tibet

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