High-pressure metamorphism in the Chinshuichi area, Yuli belt, eastern Taiwan

Keyser, William; Tsai, Chin-Ho; Iizuka, Yoshiyuki; Oberhänsli, Roland; Ernst, W. G.

doi:10.1016/j.tecto.2015.09.012

Cited by 28 publications

(30 citation statements)

References 38 publications

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“…(a) Blueschist with a crystallization age of 15.4~16 Ma by magmatic zircon U‐Pb dating, the spotted schist of a mélange deposits formed after middle Miocene by detrital zircon U‐Pb dating (this study). (b) Peak metamorphism of spotted schist at 486~550°C and 7.4~9 kbar [ Chiang , ] or 530~550°C and 15.5~17 kbar [ Baziotis et al ., ; Keyser et al ., ], amphibolites at ~500°C and 7~8 kbar [ Liou , ], and blueschist at ~550°C and 10~12 kbar [ Beyssac et al ., ]. The Yuli belt inferred to have developed under P‐T conditions of 486~550°C and 7~15.5 kbar.…”

Section: Discussionmentioning

confidence: 99%

“…However, based on the results of previous geochronological and metamorphic studies, the Yuli belt is inferred to have developed under P‐T conditions of 486~550°C and 7~17 kbar [ Beyssac et al ., ; Chiang , ; Liou , ; Baziotis et al ., ; Keyser et al ., ] and is interpreted as a metamorphosed mélange formed at deeper levels of the accretionary complex during subduction (Figure b). This suggests that the middle‐late Miocene metamorphic complex resulted from subduction of the South China Sea oceanic crust beneath the Philippine Sea Plate before the arc‐continent collision at 6~5 Ma.…”

Section: Discussionmentioning

confidence: 99%

“…The Yuli belt to the east is composed mostly of spotted schist (Figure a) with enclosed allochthonous blocks of blueschist (Figure b), amphibolite, nephrite, serpentinite (Figure c), gabbro, albitite (Figure d), chlorite schist, and metabasite and has also been inferred to be a Mesozoic mélange [ Biq , ; Jahn and Liou , ; Jahn et al ., ; Liou , ; Liou et al ., ; Lo and Yui , ; Yen , ; Yui and Lo , ; Yui et al ., ]. Moreover, the amphibolite facies metamorphic spotted schist and enclosed blocks of blueschist exhibit amphibolite‐high greenschist facies [ Baziotis et al ., ; Keyser et al ., ]. Jahn et al .…”

Section: Regional Geologymentioning

confidence: 99%

“…The Yuli belt consists mainly of spotted schist, including exotic metamafic blocks [ Yen , ] (Figures a and b). This belt is characterized by amphibolite‐upper greenschist facies for the host rocks of spotted schist and blueschist, which record peak temperatures and pressures of about 486~550°C and 7~17 kbar, respectively [ Liou et al ., ; Liou , ; Chiang , ; Beyssac et al ., ; Baziotis et al ., ; Keyser et al ., ]. Previous studies of these rocks have focused on 40 K/ 40 Ar, 40 Ar/ 39 Ar, and 87 Rb/ 86 Sr geochronological dating of exotic metamafic rocks with cooling ages of about 14~8 Ma.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Chung

Chou³

et al. 2017

Tectonics

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The Yuli metamorphic belt has been the topic of petrological and geochronological studies for over 40 years and has been interpreted as a Cretaceous mélange. Our study utilizes zircon U‐Pb dating of schist and exotic blueschist blocks in the Yuli belt. These new ages indicate that these metamorphic rocks are actually middle Miocene in age and may represent the deeper structural levels of an accretionary prism. Several distinctive detrital zircon U‐Pb age populations are recognized from 14 siliceous schists of mélange‐hosted rocks that are similar in age population to the Cretaceous, Eocene‐Oligocene, and Miocene strata of Taiwan. The wide range of ages is interpreted as a product mixing of various sedimentary strata prior to metamorphism. Three blueschists of a volcanic‐arc protolith enclosed within the host rocks yield crystallization ages of 15.4 ± 0.4, 15.5 ± 0.3, and 16.0 ± 0.2 Ma based on zircon U‐Pb dating. In consideration of the new data regarding the Cretaceous‐Miocene host rocks and the middle Miocene exotic blueschist blocks, it strongly suggests that the Yuli belt formed at deeper levels of an accretionary wedge during subduction of South China Sea oceanic crust at the middle‐late Miocene. Subsequently, the rapid uplift of the metamorphic belt was probably related to doubly vergent wedge extrusion due to the Pliocene arc‐continent collision.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Chen

Chung

Chou³

et al. 2017

Tectonics

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“…; Liou, ). Some of the blocks contain rocks bearing HP index minerals, for example, glaucophane and/or omphacite (Liou et al ., ; Lin et al ., ; Yui & Lo, ; Beyssac et al ., ; Tsai et al ., ; Keyser et al ., in press). The contacts between these blocks and surrounding rocks are not exposed.…”

Section: Geological Setting and Field Occurrencementioning

confidence: 99%

New P–T constraints on the Tamayen glaucophane‐bearing rocks, eastern Taiwan: Perple_X modelling results and geodynamic implications

Baziotis

Tsai

Ernst

et al. 2016

Journal Metamorphic Geology

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New pseudosection modelling was applied to better constrain the P-T conditions and evolution of glaucophane-bearing rocks in the Tamayen block of the Yuli belt, recognized as the world's youngest known blueschist complex. Based on the predominant clinoamphibole, textural relationships, and mineral compositions, these glaucophane-bearing high-P rocks can be divided into four types. We focused on the three containing garnet. The chief phase assemblages are (in decreasing mode):(Type-II), and amphibole + quartz + albite + epidote + garnet + rutile + hematite + titanite (Type-III). Amphibole exhibits compositional zoning from core to rim as follows: glaucophane ? pargasitic amphibole ? actinolite (Type-I), barroisite ? Mg-katophorite/taramite ? Fe-glaucophane (Type-II), glaucophane ? winchite (Type-III). Using petrographic data, mineral compositions and Perple_X modelling (pseudosections and superimposed isopleths), peak P-T conditions were determined as 13 AE 1 kbar and 550 AE 40°C for Type-I, 10.5 AE 0.5 kbar and 560 AE 30°C for Type-II (thermal peak) and 11 AE 1 kbar and 530 AE 30°C for Type-III. The calculations yield higher pressures and temperatures than previously thought; the difference is~1-6 kbar and 50-200°C. The three rock types record similar P-T retrograde paths with clockwise trajectories; all rocks followed trajectories with substantial pressure decrease under near-isothermal conditions (Type-I and Type-III), with the probable exception of Type-II where decompression followed colder geotherms. The P-T paths suggest a tectonic environment in which the rocks were exhumed from maximum depths of~45 km within a subduction channel along a relative cold geothermal gradient of~11-14°C km À1 .

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Geochemical compatibility and discrimination elements of magnetite on the eastern and western beaches of Taiwan

Mitwally,

2023

Environ Earth Sci

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Our primary purposes are to determine the genesis and essential source rocks that supply the magnetite on beaches and the compatible and discriminate chemical elements of the rocks and beach sands magnetite using the multivariate diagram and Principle component analysis (PCA) technique. The magnetite formation environments in this study are magmatic and hydrothermal genesis. Regularly, the concentration of magnetite on the western side is decreasing from north to south, where the higher concentration at Crescent Beach, which is considered as the river mouth of the Touqian river which is passing across through some of the andesite rocks, that is regarded as the source of the magnetite at this region. On the eastern side, the higher concentration of magnetite at Dagangkou, Chenggong (Sanxiantai), Donghe beaches and Taitung Creek Estuary in Taitung city, and Nan-an and Heping beaches in Yilan city. A higher concentration of the magnetite at Dagangkou, Chenggong (Sanxiantai), Donghe beaches and Taitung Creek Estuary may be due to these sites considered the river mouths of the Beinan, Wamuku and Xiuguluan rivers, these rivers passing across through Lichi mélange, which leads to the higher concentration due to the presence of these igneous and hydrothermal facies. Generally, the surrounding rocks are considered the main supplies of magnetite on the western and eastern beaches.

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High-pressure metamorphism in the Chinshuichi area, Yuli belt, eastern Taiwan

Cited by 28 publications

References 38 publications

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

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

New P–T constraints on the Tamayen glaucophane‐bearing rocks, eastern Taiwan: Perple_X modelling results and geodynamic implications

Geochemical compatibility and discrimination elements of magnetite on the eastern and western beaches of Taiwan

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