Provenance and tectonic setting of middle-upper Devonian sandstones in the Qinling Orogen (Shanyang area): New insights from geochemistry, heavy minerals and tourmaline chemistry

Shi, Guanglu; Wang, Hua; Huang, Chunyan; Yang, Shui-Yuan; Song, Guangzeng

doi:10.1016/j.tecto.2016.09.023

Cited by 13 publications

(5 citation statements)

References 69 publications

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“…The age of the collision remains 663 disputed, although a Triassic collision is often put forward, several lines of evidence argue for 664 a pre-Devonian collisional event, at ca 420 Ma (e.g. Mattauer et al, 1985;Faure et al, 2008, 665 Dong et al, 2015Shi et al, 2016). Neverheless, whatever its real age, the SCB-NCB 666 collision is younger than the Early Paleozoic tectonics in Indochina, and it will not be 667 considered in the following.…”

Section: Linh MCC 569mentioning

confidence: 99%

Early Paleozoic or Early-Middle Triassic collision between the South China and Indochina Blocks: The controversy resolved? Structural insights from the Kon Tum massif (Central Vietnam)

Faure

Nguyen

Hoai

et al. 2018

Journal of Asian Earth Sciences

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Section: Linh MCC 569mentioning

confidence: 99%

Early Paleozoic or Early-Middle Triassic collision between the South China and Indochina Blocks: The controversy resolved? Structural insights from the Kon Tum massif (Central Vietnam)

Faure

Nguyen

Hoai

et al. 2018

Journal of Asian Earth Sciences

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“…6b), the REE characteristics of the sandstones from the Xiongcun Formation are consistent with those of an oceanic island-arc setting. Immobile trace elements have additionally been used to successfully discriminate among the tectonic settings of clastic sediments (Bhatia & Crook, 1986; McLennan et al 1993; Griffin et al 2004; Sun, Gui & Chen, 2012; Shi et al 2016). The Jurassic sandstones in the Xiongcun district show: low abundances of La, Th, Zr and Nb; low ratios of Th/U and La/Sc; and high ratios of La/Th and Zr/Th (Table 2).…”

Section: Discussionmentioning

confidence: 99%

“…Abbreviations as for Figure 12. Griffin et al 2004;Sun, Gui & Chen, 2012;Shi et al 2016). The Jurassic sandstones in the Xiongcun district show: low abundances of La, Th, Zr and Nb; low ratios of Th/U and La/Sc; and high ratios of La/Th and Zr/Th (Table 2).…”

Section: D Tectonic Settingsmentioning

confidence: 99%

“…The petrographic features and chemical index of sandstones can be used to help interpret their sedimentary environment, source area and tectonic depositional setting (Dickinson & Suczek, 1979;Dickinson et al 1983;Chen et al 2016). The chemical composition of sand- †Author for correspondence: liudong@cdut.edu.cn stones, such as major elements (Fe 2 O 3 * + MgO), TiO 2 , Al 2 O 3 /SiO 2 and K 2 O/Na 2 O, immobile elements such as La, Th, Sc and Zr, and their ratios, can further reveal their tectonic setting and provenance (Bhatia & Crook, 1986;McLennan & Taylor, 1991;McLennan et al 1993;Griffin et al 2004;Sun, Gui & Chen, 2012;Shi et al 2016). The zircon Lu-Hf isotope compositions combined with U-Pb ages from zircons within sandstones can provide further valuable information on the provenance, depositional age and tectonic setting of sedimentary basins (Andersen, 2005;Augustsson et al 2006;Cawood, Hawkesworth & Dhuime, 2012;Chen et al 2016;Du et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Detrital zircon geochronology and geochemistry of Jurassic sandstones in the Xiongcun district, southern Lhasa subterrane, Tibet, China: implications for provenance and tectonic setting

et al. 2018

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Jurassic sandstones in the Xiongcun porphyry copper–gold district, southern Lhasa subterrane, Tibet, China were analysed for petrography, major oxides and trace elements, as well as detrital zircon U–Pb and Hf isotopes, to infer their depositional age, provenance, intensity of source-rock palaeo-weathering and depositional tectonic setting. This new information provides important evidence to constrain the tectonic evolution of the southern Lhasa subterrane during the Late Triassic – Jurassic period. The sandstones are exposed in the lower and upper sections of the Xiongcun Formation. Their average modal abundance (Q21F11L68) classifies them as lithic arenite, which is also supported by geochemical studies. The high chemical index of alteration values (77.19–85.36, mean 79.96) and chemical index of weathering values (86.19–95.59, mean 89.98) of the sandstones imply moderate to intensive weathering of the source rock. Discrimination diagrams based on modal abundance, geochemistry and certain elemental ratios indicate that felsic and intermediate igneous rocks constitute the source rocks, probably with a magmatic arc provenance. The detrital zircon ages (161–243 Ma) and εHf(t) values (+10.5 to +16.2) further constrain the sandstone provenance as subduction-related Triassic–Jurassic felsic and intermediate igneous rocks from the southern Lhasa subterrane. A tectonic discrimination method based on geochemical data of the sandstones, as well as detrital zircon ages from sandstones, reveals that the sandstones were most likely deposited in an oceanic island-arc setting. These results support the hypothesis that the tectonic background of the southern Lhasa subterrane was an oceanic island-arc setting, rather than a continental island-arc setting, during the Late Triassic – Jurassic period.

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“…Even if tourmaline was noticed in [3] in the Brkini basin and is considered an important heavy mineral in provenance studies [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], no specific studies have been performed on this mineral in the Julian and Brkini basins. This study would like to fill the gap, and by analyzing the chemistry of detrital tourmaline, would like to verify possible changes in its quantity and typology across space and time.…”

Section: Introductionmentioning

confidence: 99%

Detrital Tourmalines in the Cretaceous–Eocene Julian and Brkini Flysch Basins (SE Alps, Italy and Slovenia)

Lenaz,

Garlatti,

Bernardi

et al. 2024

Minerals

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In the SE Alps, two Cretaceous–Eocene flysch basins, Julian and Brkini, filled with turbidite sediments, are present. This study novelly reports heavy mineral assemblage counts and detrital tourmaline characterization for 11 samples. It is possible to define three different groups, characterized by the presence of (1) a clinopyroxene–epidote–low-ZTR (zircon+tourmaline+rutile; 5%) sample association, (2) a high-ZTR (>48%)–garnet–apatite association and (3) a low-ZTR (<40%)–Cr-spinel–garnet association. Detrital tourmalines from both the Julian and Brkini flysch basins are rather similar in composition, associated with metapelites and metapsammites coexisting or not coexisting with an Al-saturating phase, ferric-iron-rich quartz–tourmaline rocks and calc–silicate rocks; however, their number is drastically different. In fact, even if the percentage of heavy minerals is very low and similar in both basins (0.17–1.34% in weight), in the Julian basin, the number of tourmaline crystals is much lower than that in Brkini (1–14 vs. 30–100), suggesting an important change in the provenance area. Interestingly, the presence of a high amount of tourmaline derived from ferric-iron-rich quartz–tourmaline rocks and calc–silicate rocks makes these two basins different from all the Cretaceous flysch basins of Bosnia and the Northern Dinaric zone, where these supplies are missing or very limited.

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Provenance and tectonic setting of middle-upper Devonian sandstones in the Qinling Orogen (Shanyang area): New insights from geochemistry, heavy minerals and tourmaline chemistry

Cited by 13 publications

References 69 publications

Early Paleozoic or Early-Middle Triassic collision between the South China and Indochina Blocks: The controversy resolved? Structural insights from the Kon Tum massif (Central Vietnam)

Early Paleozoic or Early-Middle Triassic collision between the South China and Indochina Blocks: The controversy resolved? Structural insights from the Kon Tum massif (Central Vietnam)

Detrital zircon geochronology and geochemistry of Jurassic sandstones in the Xiongcun district, southern Lhasa subterrane, Tibet, China: implications for provenance and tectonic setting

Detrital Tourmalines in the Cretaceous–Eocene Julian and Brkini Flysch Basins (SE Alps, Italy and Slovenia)

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