A reinterpretation of the metamorphic Yuli belt: Evidence for a middle-late Miocene accretionary prism in eastern Taiwan

Chen, Wen Shan; Chung, Sun‐Lin; Chou, Hsien-Yuan; Zugeerbai, Zul; Shao, Wen-Yu; Lee, Yuan-Hsi

doi:10.1002/2016tc004383

Cited by 47 publications

(63 citation statements)

References 37 publications

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“…Previous studies interpret the lower grade metamorphic rocks as originating from seafloor metamorphism at a spreading ridge (Liou et al, ; Liou & Ernst, ), but another possibility is that they were metamorphosed by slab‐derived fluids in subduction channel before they were exhumed (Morishita et al, ). The detrital zircon age of the Yuli Belt of the eastern Central Range indicates that the greenschist‐amphibolite facies metamorphic complex formed from middle‐late Miocene (W. S. Chen et al, ). Some of the metamorphic rocks in the Yuli Belt probably have affinities with the ETO of the Lichi Mélange.…”

Section: Tectonic Models For the Formation Of The East Taiwan Ophiolimentioning

confidence: 99%

Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite

Lin

Harris

Sun

et al. 2019

Geochem Geophys Geosyst

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The East Taiwan Ophiolite (ETO) occurs as blocks and thrust sheets associated with the Lichi Mélange in the Coastal Range of eastern Taiwan. The blocks consist of serpentinized harzburgite, serpentinite breccia, gabbro, dikes of dolerite and plagiogranite, pillow basalts, and red clay within a mud‐ and serpentinite‐rich mélange matrix. New U‐Pb zircon dating of a pegmatite gabbro yields a weighted mean age of 16.65 ± 0.20 Ma. This age is earlier than the North Luzon Arc but overlaps with the late‐stage spreading of the South China Sea. ETO glassy basalt has low K2O, MgO and high CaO contents, similar to MORB. REE and trace element patterns show both N‐MORB patterns with LREE depletion and E‐MORB patterns with slight LREE enrichment. A few samples show slight depletion in Nb‐Ta and Ti and enrichment in Rb, Ba, U and Sr, indicating a hint of subduction influence. Most ETO basalt plots within the overlapping fields of N‐MORB and BABB on Ti‐V, Cr‐Y, Nb/Yb‐Th/Yb, and Hf/3‐Th‐Ta discrimination diagrams. These geochemical compositions are emblematic of mid‐ocean ridge or back‐arc lava, like South China Sea basalt. We interpret ETO basalt and gabbro as fragments of the subducted South China Sea basement that were scrapped off and accreted to the Luzon forearc during the process of subduction initiation along the Manila Trench. Blocks of mantle material in the mélange may originate from the upper plate of the arc‐continent collision and were mixed with lower plate crustal material in a subduction channel now represented by the Lichi Mélange.

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Section: Tectonic Models For the Formation Of The East Taiwan Ophiolimentioning

confidence: 99%

Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite

Lin

Harris

Sun

et al. 2019

Geochem Geophys Geosyst

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“…In order to represent these observations, various conceptual models have been proposed to interpret the relation between the recorded thermal maturities and geological structures (e.g., Underwood et al 1993). The temporal development of thermal maturity and their relationships to the associated structures in accretionary wedges have been investigated to date (Barr and Dahlen 1989;Barr et al 1991;Beyssac et al 2007;Chen et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Thermal maturity structures in an accretionary wedge by a numerical simulation

Miyakawa

Kinoshita

Hamada

et al. 2019

Prog Earth Planet Sci

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This study investigates the thermal maturity structure of the accretionary wedge along with the thermal history of sediments during wedge formation using a numerical simulation. The thermal maturity, which is described in terms of vitrinite reflectance, is determined using the temperature and duration of exposure based on the particle trajectories within the accretionary wedge. This study revealed the variability in the thermal maturity even though sediments are observed to originate at an identical initial depth and thermal conditions. We propose two endmember pathways of sediment movement in the accretionary wedge during wedge growth: a shallow, low thermal maturity pathway and a deep, high thermal maturity pathway. These shallow path sediments, which move into the shallow portion of the wedge during wedge growth through accretion, rarely experience high temperatures; therefore, their thermal maturity is low. However, the sediments subducted in the deep portion of the wedge experience high temperatures and obtain high thermal maturity as a function of the deep high thermal maturity pathway. Simultaneously, a geological deformation event, such as faulting, defines the steps of thermal maturity. The small step of thermal maturity is formed by the frontal thrusting and can be preserved as a function of the shallow low thermal maturity pathway. However, the step is overprinted and is observed to disappear through the deep high thermal maturity pathway. The large step of thermal maturity is formed by long-term displacement along an out-of-sequence thrust (OOST) in the deep portion of the wedge.

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“…Peak metamorphic conditions yielded temperatures of about 486–550 °C and pressures of 7–17 kbar (Baziotis et al, ; Beyssac et al, ; Beyssac et al, ; Keyser et al, ; Tsai et al, ). These conditions have been reached between 16 Ma (depositional age determined by zircon U‐Pb dating; Chen et al, ) and 12 Ma as derived by Ar40/Ar39 dating on amphibole, phengite, and phlogopite (Lo & Yui, ). The TB is overlain by slates formed by synrift shallow‐marine Eocene deposits and postrift Miocene deep‐marine sediments of the Backbone Range (BR).…”

Section: Geodynamic and Geological Settingmentioning

confidence: 99%

Strain Partitioning and Exhumation in Oblique Taiwan Collision: Role of Rift Architecture and Plate Kinematics

et al. 2020

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Taiwan is an archetypal example of continental accretionary wedges. Yet the generally poor knowledge of three-dimensional strain distribution over time and role of architecture of the rifted margin shed doubt on the cylindrical two-dimensional kinematic models of Taiwan collision. Here we provide new field-based constraints on strain distribution, new Raman Spectroscopy on Carbonaceous Materials temperatures and apply mica-chlorite multiequilibrium approach to determine pressure-temperature in the Central Range of Taiwan. We identify three distinct structural domains that define zones of orthogonal shortening in the western Backbone Range and left-lateral ductile shearing overprinted by left-lateral transtensional brittle deformation in eastern Central Range. Field surveys show the lack of nappe stacking in the Backbone Range. Combining new temperature estimates with existing thermochronological constraints we emphasize that western Taiwan mostly inherited preorogenic thermal history. We show that metamorphic peak conditions of 5-6 kbar and 330-400°C in the eastern Backbone Range and HP rocks of the Yuli Belt exhumed along the P-T paths related to transcurrent deformation. We propose a three-dimensional kinematic model of Taiwan accounting for the oblique motion of the Philippine Sea Plate relative to the plate boundary and the reactivation of a NS striking transform fault in the South China Sea rifted margin. Recent and ongoing strain partitioning in the Taiwan accretionary wedge is reflected by the coexistence of brittle left-lateral shear, oblique extension, and contraction. Our results have impact on orogen-based plate kinematic reconstructions that consider two-dimensional kinematic evolution of orogens.

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A reinterpretation of the metamorphic Yuli belt: Evidence for a middle-late Miocene accretionary prism in eastern Taiwan

Cited by 47 publications

References 37 publications

Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite

Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite

Thermal maturity structures in an accretionary wedge by a numerical simulation

Strain Partitioning and Exhumation in Oblique Taiwan Collision: Role of Rift Architecture and Plate Kinematics

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