The Chimei Submarine Canyon and Fan: A Record of Taiwan Arc‐Continent Collision on the Rapidly Deforming Overriding Plate

Hsieh, Yu‐Huan; Liu, Char‐Shine; Suppe, John; Byrne, T. B.; Lallemand, Serge

doi:10.1029/2020tc006148

Cited by 25 publications

(23 citation statements)

References 96 publications

(160 reference statements)

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“…16A). Similar doubly-vergent wedge structures have been reported in the northern Coastal Range (e.g., Yen et al, 2018), directly offshore to the east (Hsieh et al, 2020), and the Huatung Ridge in southern offshore (e.g., Huang et al, 2000;Hirtzel et al, 2009;Chi et al, 2014) (Figs. 1A).…”

Section: Crustal Shortening and Tectonic Recycling At The Suture Of Asupporting

confidence: 80%

“…1 Ma and post-date deposition in the Coastal Range foredeep basin (Chi et al, 1981;Dorsey, 1992). In addition, convergence on the oblique west-vergent Longitudinal Valley fault, and east-vergent thrust belt offshore of eastern Taiwan (e.g., Huang et al, 2010;Hsieh et al, 2020), suggests that the Coastal Range is an active doubly-vergent transpressional wedge within the active collisional suture between the Eurasian and Philippine Sea plates (e.g., Malavieille et al, 2016;Thomas et al, 2014) (Figs. 16A).…”

Section: Crustal Shortening and Tectonic Recycling At The Suture Of Amentioning

confidence: 99%

See 1 more Smart Citation

Polygenetic mélange in the retrowedge foredeep of an active arc-continent collision, Coastal Range of eastern Taiwan (accepted manuscript)

Lai¹,

Dorsey²,

Horng³

et al. 2022

Preprint

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The Plio-Pleistocene Lichi Mélange in the Coastal Range of eastern Taiwan offers an excellent opportunity to study processes of mélange development at the continent-ocean interface of an active arccontinent collision. This paper presents new results of detailed geologic mapping, lithofacies analysis, magneto-biostratigraphy, paleocurrent, and paleoslope analyses in the southern Coastal Range to investigate the origins and significance of this mélange. The results show that the Lichi Mélange consists of mass-transport deposits including well-stratified block-in-matrix beds (olistostromes), extra-formational blocks (olistoliths), and broken formation with abundant soft-sediment deformation features that transition laterally into distal mega-slump beds and pebbly mudstones (subaqueous debrites). Abundant observations of depositional This is a postprint submitted to the EarthArXiv by Larry Syu-Heng Lai 2 contacts and interbedding of mélange with contemporary (ca. 4-1 Ma) flysch units of the Fanshuliao and Paliwan formations confirm their sedimentary origin. Compacted sedimentological shear fabrics in olistostromal facies are broadly parallel to internal stratification and bedding, and are readily distinguishable from cross-cutting brittle fault zones related to post ~1 Ma west-vergent thrust faults. Paleoslope and paleocurrent analyses record down-slope gravity-driven transport toward the east and southeast. The data provide evidence for a polygenetic origin of the Lichi Mélange, in which sedimentary masswasting deposits are overprinted by younger tectonic shear zones. Slide blocks, conglomerate clasts, and detrital sand were all derived from an eroding source in the east-vergent eastern retrowedge of the Taiwan collisional orogen. The source area included tectonically accreted fragments of the two converging plates that represent shallow-crustal equivalents of the Miocene Yuli Belt and Eastern Slates exposed in the modern Central Range. Reconstructed stratigraphic panels record eastward progradation of olistostromal facies over distal basinal flysch deposits, which we infer resulted from eastward (oceanward) migration of a steep submarine slope at the leading edge of the retrowedge orogenic front. Thus, the Coastal Range basin evolved as a migrating retro-foredeep basin that formed on top of older, pre-collisional volcanic arc and forearc crust. These results demonstrate a unique type of sedimentary basin that is formed and then rapidly inverted at a convergent continent-ocean interface during the transition from intra-oceanic subduction to arc-continent collision. This revised history of the Lichi Mélange provides a new perspective on the dynamics of rapid crustal mixing and tectonic recycling at the convergent suture of an active arc-continent collision system.

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Section: Crustal Shortening and Tectonic Recycling At The Suture Of Asupporting

confidence: 80%

Section: Crustal Shortening and Tectonic Recycling At The Suture Of Amentioning

confidence: 99%

Polygenetic mélange in the retrowedge foredeep of an active arc-continent collision, Coastal Range of eastern Taiwan (accepted manuscript)

Lai¹,

Dorsey²,

Horng³

et al. 2022

Preprint

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“…Local low‐relief transient surfaces at the top of some major drainage divides (Hsieh et al, 2017) are superposed on geological structures (fold axes and thrusts). These observations indicate that the landscape of the Coastal Range mainly reflects a pattern of differentially eroded bedrock lithologies and structures (Hsieh et al, 2020; Lai et al, 2021), and does not preserve a topographic signal inherited from older (Miocene) volcanic islands (cf. Hsieh et al, 2011, 2017; Lai & Song, 2013).…”

Section: Geological Settingmentioning

confidence: 98%

Coarse sediment supply sets the slope of bedrock channels in rapidly uplifting terrain: Field and topographic evidence from eastern Taiwan

Lai

Roering

Finnegan

et al. 2021

Earth Surf Processes Landf

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“…Published geophysical and geochemical data, sedimentation rates, and geomagnetic modeling, show that the HB is likely a trapped remnant of Cretaceous-aged oceanic basin (Deschamps et al, 2000;Hickey-Vargas et al, 2008;Eakin et al, 2015;Huang et al, 2019;Hsieh et al, 2020). However, other studies favor a younger age for the HB based on seafloor magnetics and seismology, including Eocene (Hilde and Lee, 1984), Eocene to Miocene (Sibuet et al, 2002), Oligo-Miocene (Kuo et al, 2009), or mid-late Eocene (Doo et al, 2014).…”

Section: Implications For Se Asia Tectonic Evolutionmentioning

confidence: 99%

First identification of a Cathaysian continental fragment beneath the Gagua Ridge, Philippine Sea, and its tectonic implications

Qian

Zhang

et al. 2021

Geology

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The tectonic history of the Philippine Sea plate is an essential piece in understanding the tectonic evolution of Southeast Asia, but it is still unclear and controversial. We present the first geochemical data obtained from lavas from the Gagua Ridge (GR) within the Philippine Sea. The GR lavas exhibit geochemical signatures typical of subduction-related arc magmatism. Plagioclase Ar-Ar ages of ca. 124–123 Ma and subduction-related geochemical signatures support the formation of GR lavas in the vicinity of an arc during the Early Cretaceous induced by subduction of the oceanic plate along East Asia. The ages of trapped zircon xenocrysts within the GR lavas cluster at 250 Ma, 0.75 Ga, and 2.45 Ga and match well the ages of zircons recovered from the Cathaysian block, southern China. Our results imply that the GR basement is partially composed of continental material that rifted away from the Eurasian margin during opening and spreading of the Huatung Basin. The depleted mantle wedge-derived magmas evolved and picked up the continental zircons during ascent. The youngest zircon ages and the GR lava Ar-Ar ages (ca. 124–123 Ma) presented in this study newly constrain an Early Cretaceous age for the Huatung Basin. Our study provides further evidence that the Huatung Basin is a remnant of a Mesozoic-aged ocean basin that dispersed from southern China during the Cretaceous. Transport of continental slivers by growth and closure of marginal seas along the East Asia margin may have been more prevalent than previously recognized.

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The Chimei Submarine Canyon and Fan: A Record of Taiwan Arc‐Continent Collision on the Rapidly Deforming Overriding Plate

Cited by 25 publications

References 96 publications

Polygenetic mélange in the retrowedge foredeep of an active arc-continent collision, Coastal Range of eastern Taiwan (accepted manuscript)

Polygenetic mélange in the retrowedge foredeep of an active arc-continent collision, Coastal Range of eastern Taiwan (accepted manuscript)

Coarse sediment supply sets the slope of bedrock channels in rapidly uplifting terrain: Field and topographic evidence from eastern Taiwan

First identification of a Cathaysian continental fragment beneath the Gagua Ridge, Philippine Sea, and its tectonic implications

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