Metamorphic Sole Chronicles Protracted Subduction Initiation of the Neo-Tethys
Author:
Jie Shen;Jingen Dai;Kai Yang
DOI:
10.12297/dpr.dde.202401.1
Category:
C_CC_8_6C_CC_8_7C_CC_8_3
Keywords:
metamorphic solesubduction initiationgeochronology
Abstract
Subduction, a fundamental force in plate tectonics, remains obscure due to the scarcity of evidence regarding its initiation. Metamorphic soles (MSs), formed by high-temperature metamorphism of the subducted plate during subduction initiation (SI), offer invaluable insights into this enigmatic stage. Here we re-evaluate the timing of MS formation in the central Yarlung Zangbo Ophiolite (YZO) by combining zircon, apatite, and titanite U-Pb ages with their REE patterns. Our results indicate that the earliest and latest recorded ages of the MSs being 146 Ma and 115 Ma, while their protolith formed no later than 159 Ma . The notably older protolith, compared to both the MS and the prevailing YZO (130-120 Ma), implies that Neo-Tethys SI in the YZO likely transpired along a transform fault or fracture zone between oceanic lithospheres of differing ages. The broad age ranges for MS underscore a protracted SI spanning nearly 25 Ma, delineated into two stages: (1) the stagnant stage (~146 Ma-130 Ma) marked by a slow rate and a dry mantle and (2) the unlocking stage (~130-120 Ma) was characterized by an accelerated rate and rapid upper plate extension, resulting in the formation of the YZO. We also report late-stage of MS younger than the YZO. This study provides critical constraints on the timing and duration of the Neo-Tethys SI, highlighting the extended and intricate interplay between subduction and exhumation processes.
Entity Data
Table S1 The information of metamorphic sole.xlsx
Table S2 SHRIMP zircon U-Pb data and its REE.xlsx
Table S3 U-Pb and REE of zircon.xlsx
Table S4 Lu-Hf data of zircon.xlsx
Table S5 apatite U-Pb dating and trace element.xlsx
Table S6 Titanite U-Pb data.xlsx
Table S7 Published zircon U-Pb ages of the central YZO.xlsx
Fig S1 Field photo and photomicrographs.pdf
FIG S2 Saga zircon CL.pdf
FIG S3 Tera-wasserberg U-Pb concordia age of zircon.pdf
FIG S4 REE pattern of apatite and zircon.pdf
FIG S5 zircon Hf(t) vs ages.pdf
FIG S6 Tera-wasserberg U-Pb concordia age of apatite.pdf
FIG S7 Bainang zircon CL.pdf
FIG S8 Bainang and Lhaze titanite ages.pdf
FIG S9 LREE with Sr-Y of apatite.pdf
Reference This Dataset
Jie Shen;Jingen Dai;Kai Yang.Metamorphic Sole Chronicles Protracted Subduction Initiation of the Neo-Tethys.DDE Repository.2024-01-01.doi:10.12297/dpr.dde.202401.1