Provenance analysis of the Miocene accretionary prism of the Hengchun Peninsula, southern Taiwan, and regional geological significance

Zhang, Xingchang; Yan, Yi; Huang, Chi‐Yue; Chen, Duofu; Shan, Yehua; Lan, Qing; Chen, Wenhuang; Yu, Mengming

doi:10.1016/j.jseaes.2014.01.021

Cited by 37 publications

(48 citation statements)

References 55 publications

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“…As described above, all of the N‐MORB‐type basalts within the Hengchun accretionary wedge were off‐scraped from the subducted oceanic crust of the SCS together with the overlying fine‐grained sediments derived from the South China continent (Kirstein et al, ; X. C. Zhang et al, ). This can be attributed to the volumetric prevalence of N‐MORB in the oceanic crust (H. Y. Chen et al, ) and is a normal phenomenon in accretionary complexes.…”

Section: Discussionmentioning

confidence: 99%

“…The Hengchun accretionary prism mainly consists of thick middle to late Miocene turbiditic sequences (N14–N17; L. S. Chang, ), which have been folded and overturned westward and thrust upon the Kenting Mélange along the Kenting Fault. The sediments that accumulated in the accretionary wedge were off‐scraped from the subducted SCS oceanic lithosphere and originally sourced from southeast China (Kirstein et al, ; X. C. Zhang et al, ). The turbidite sequences can be considered a single stratigraphic unit, namely, the Mutan Formation (C. P. Chang et al, ).…”

Section: Geologic Settingmentioning

confidence: 99%

“…The major lentiform bodies intercalated in the Mutan Formation include the following: (a) The Lilungshan Sandstone (Mtl), which is interfingered with the underlying Mutan Formation. It exhibit a coarsening and thickening upward sequence from thin sandy turbidites to thick sandstones and finally to conglomerates (X. C. Zhang et al, ). Therefore, the Lilungshan Sandstone is considered the upper member of a submarine fan deposits, while part of the underlying Mutan Formation represents the lower part of the same submarine deposits (S. B. Lin & Wang, ).…”

Section: Geologic Settingmentioning

confidence: 99%

“…Therefore, the Lilungshan Sandstone is considered the upper member of a submarine fan deposits, while part of the underlying Mutan Formation represents the lower part of the same submarine deposits (S. B. Lin & Wang, ). (b) The Shihmen Conglomerate (Mtk), with the Ssuchungchi Gorge (SG) as a representative outcrop and the slump deposits in Cingwashih area as fragments of it, is characterized by the dominance of magmatic components and is predominantly composed of thick‐bedded channel‐fill deposits (i.e., conglomerate) with subordinate sandstones (S. B. Lin & Wang, ; X. C. Zhang et al, ). The well‐sorted pebbles within the Shihmen Conglomerate are generally clast supported, with the clast components composed of sand, as well as rock fragments and feldspar, which are likely produced by mutual abrasion between the igneous blocks.…”

Section: Geologic Settingmentioning

confidence: 99%

“…The subordinate sandstones are generally poorly to moderately sorted and contain a large proportion of silt, granules and fine gravels, with the cementation types predominantly include calcium cementation, followed by clay mineral cementation. (c) The Loshui Sandstone (Mtg) consists mainly of thick fine‐ to medium‐grained sandstone beds and sandy turbidite layers, with minor amounts of igneous detritus (Kirstein et al, ; X. C. Zhang et al, ). The compositions of the conglomerate and igneous detritus within these lentiform bodies are mainly basalt, gabbro, diabase, and meta‐basaltic rocks.…”

Section: Geologic Settingmentioning

confidence: 99%

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Geochemistry and Geochronology of the Accreted Mafic Rocks From the Hengchun Peninsula, Southern Taiwan: Origin and Tectonic Implications

et al. 2019

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The accretionary prism of the Hengchun Peninsula at the southernmost tip of the active Taiwan orogen has newly emerged due to the transition from a subduction zone to an arc‐continent collision zone. The mafic rocks within the Hengchun accretionary prism, whose provenance has long been controversial, are highly indicative of the mantle nature and tectonic evolution around the northern Manila Trench. Based on geochemical analyses, the accreted basalts are classified as normal and enriched mid‐ocean ridge basalts (N‐MORB and E‐MORB) and alkaline ocean island basalts. The N‐MORBs, which exhibit geochemical signatures indicative of virtually unmetasomatized depleted MORB mantle and yield zircon U‐Pb ages of 22.8 ± 0.3 and 24.2 ± 1.1 Ma, were off‐scraped from the subducted oceanic crust of the South China Sea (SCS). The alkaline ocean island basalts are considered fragments of subducted seamount due to their geochemical similarity with seamount basalts from the SCS. The Hf‐Nd isotopic compositions of basalts from the north SCS may represent the contributions of recycled oceanic crust and the upwelling Hainan Plume. The E‐MORBs, which exhibit similar geochemical compositions as rocks from the Huatung Basin and yield an 40Ar/39Ar age of 135.0 ± 5.6 Ma, were removed from the overriding plate due to the excessive shear stress between the converging plates and were laterally transported by strike‐slip movement; alternatively, they were off‐scraped from the subducted Luzon forearc slices. The temporary uplift and collapse of the accretionary prism caused by seamount subduction may have been responsible for the genesis of the lenticular Shihmen Conglomerate.

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Section: Discussionmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

See 3 more Smart Citations

Geochemistry and Geochronology of the Accreted Mafic Rocks From the Hengchun Peninsula, Southern Taiwan: Origin and Tectonic Implications

et al. 2019

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Evolving Yangtze River reconstructed by detrital zircon U‐Pb dating and petrographic analysis of Miocene marginal Sea sedimentary rocks of the Western Foothills and Hengchun Peninsula, Taiwan

et al. 2017

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The timing of the establishment of the Yangtze River, whether prior to the early Miocene (~24 Ma) or more recently (~2 Ma), has been a point of much debate. Here we applied detrital zircon U‐Pb dating to Miocene sedimentary rocks from Taiwan and to estuary sands from modern rivers in SE China to trace sediment provenance and to further constrain the evolution of the Yangtze River. Detrital zircon U‐Pb ages from Miocene sandstones of the Western Foothills show similar age spectra to Miocene and modern sediments in the Yangtze River drainage and some similarity to the Minjiang River sediments. However, they differ significantly from ages in some sandstones from the Hengchun Peninsula accretionary prism and from the estuary sands of the Jiulongjiang River. This information, together with petrographic and sedimentary facies analysis, argues that the Jiulongjiang and Minjiang Rivers were major sources to some Hengchun Peninsula turbidites (~12 Ma), while synchronous sedimentation in the Western Foothills was supplied from the Yangtze, Minjiang (or similar river), and possibly even the Yellow River. These sediments were transported southward/eastward via rivers or channels to the marginal sedimentary basins now inverted in the Western Foothills in Taiwan. The Yangtze River must have been established prior to the middle Miocene.

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Opening of the South China Sea and Upwelling of the Hainan Plume

Yan

Huang

et al. 2018

Geophysical Research Letters

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Opening of the South China Sea and upwelling of the Hainan Plume are among the most challenging issues related to the tectonic evolution of East Asia. However, when and how the Hainan Plume affected the opening of the South China Sea remains unclear. Here we investigate the geochemical and isotopic features of the ~25 Ma mid‐ocean ridge basalt (MORB) in the Kenting Mélange, southern Taiwan, ~16 Ma MORB drilled by the IODP Expedition 349, and ~9 Ma ocean island basalt‐type dredged seamount basalt. The ~25 Ma MORBs reveal a less metasomatic depleted MORB mantle‐like source. In contrast, the Miocene samples record progressive mantle enrichment and possibly signal the contribution of the Hainan Plume. We speculate that MORBs of the South China Sea which could have recorded plume‐ridge source mixing perhaps appear since ~23.8 Ma. On the contrary, the Paleocene‐Eocene ocean island basalt‐type intraplate volcanism of the South China continental margin is correlated to decompression melting of a passively upwelling fertile asthenosphere due to continental rifting.

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Provenance analysis of the Miocene accretionary prism of the Hengchun Peninsula, southern Taiwan, and regional geological significance

Cited by 37 publications

References 55 publications

Geochemistry and Geochronology of the Accreted Mafic Rocks From the Hengchun Peninsula, Southern Taiwan: Origin and Tectonic Implications

Geochemistry and Geochronology of the Accreted Mafic Rocks From the Hengchun Peninsula, Southern Taiwan: Origin and Tectonic Implications

Evolving Yangtze River reconstructed by detrital zircon U‐Pb dating and petrographic analysis of Miocene marginal Sea sedimentary rocks of the Western Foothills and Hengchun Peninsula, Taiwan

Opening of the South China Sea and Upwelling of the Hainan Plume

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