Changing provenance of late Neoarchean metasedimentary rocks in the Anshan-Benxi area, North China Craton: Implications for the tectonic setting of the world-class Dataigou banded iron formation

Wang, Changle; Huang, Hua; Tong, Xiaoxue; Meng, Zheng; Peng, Zidong; Nan, Jingbo; Zhang, Lianchang; Zhai, Mingguo

doi:10.1016/j.gr.2016.08.010

Cited by 37 publications

(4 citation statements)

References 89 publications

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“…Numbers show previous U-Pb zircon ages of supracrustal rocks associated with the BIFs. Age data sources: a- [45]; b- [48]; c- [49]; d- [39]; e- [42]; f- [38]; g- [50]; h- [41]; i- [51]; j- [43].…”

Section: Geological Settingmentioning

confidence: 99%

Iron and Carbon Isotope Constraints on the Formation Pathway of Iron-Rich Carbonates within the Dagushan Iron Formation, North China Craton

Tong

Mänd

et al. 2021

Minerals

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Banded iron formations (BIFs) are enigmatic chemical sedimentary rocks that chronicle the geochemical and microbial cycling of iron and carbon in the Precambrian. However, the formation pathways of Fe carbonate, namely siderite, remain disputed. Here, we provide photomicrographs, Fe, C and O isotope of siderite, and organic C isotope of the whole rock from the ~2.52 Ga Dagushan BIF in the Anshan area, China, to discuss the origin of siderite. There are small magnetite grains that occur as inclusions within siderite, suggesting a diagenetic origin of the siderite. Moreover, the siderites have a wide range of iron isotope compositions (δ56FeSd) from −0.180‰ to +0.463‰, and a relatively negative C isotope composition (δ13CSd = −6.20‰ to −1.57‰). These results are compatible with the reduction of an Fe(III)-oxyhydroxide precursor to dissolved Fe(II) through microbial dissimilatory iron reduction (DIR) during early diagenesis. Partial reduction of the precursor and possible mixing with seawater Fe(II) could explain the presence of siderite with negative δ56Fe, while sustained reaction of residual Fe(III)-oxyhydroxide could have produced siderite with positive δ56Fe values. Bicarbonate derived from both DIR and seawater may have provided a C source for siderite formation. Our results suggest that microbial respiration played an important role in the formation of siderite in the late Archean Dagushan BIF.

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Section: Geological Settingmentioning

confidence: 99%

Iron and Carbon Isotope Constraints on the Formation Pathway of Iron-Rich Carbonates within the Dagushan Iron Formation, North China Craton

Tong

Mänd

et al. 2021

Minerals

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“…Previous studies indicate that the Neo‐Tethyan ocean opened prior to the Late Triassic ( ca . 230 Ma; Cao et al, ), and starting in the Triassic, the oceanic crust began to subduct northeastward beneath the Lhasa terrane (Cao et al, ; Wang et al, ). The Neo‐Tethyan Ocean closed when the passive margin of India eventually collided with Eurasia during the Late Cretaceous to Paleogene (Cao et al, ; Ding et al, ; Hu, Garzanti, Wang, & Webb, ; Yin & Harrison, ; Zhu et al, ).…”

Section: Geological Background and Sample Descriptionsmentioning

confidence: 99%

Crustal thickening prior to 43 Ma in the Himalaya: Evidence from lower crust‐derived adakitic magmatism in Dala, eastern Tethyan Himalaya, Tibet

Dai

Dong

et al. 2019

Geological Journal

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The Himalayan-Tibetan orogen is the world's largest active orogen with the thickest continental crust on Earth. However, the timing of crustal thickening of this orogen remains controversial. In recent years, magmatic rocks with adakitic affinities have been widely used to constrain the crustal thickness. Here, we present zircon U-Pb ages, geochemical and Sr-Nd-Pb-Hf isotopic data for the Dala two-mica granites (eastern Tethyan Himalaya) that may shed light on this issue. Zircon U-Pb dating shows that the Dala two-mica granites were emplaced at ca. 43 Ma. The granites display adakitic signatures, including high SiO 2 , Al 2 O 3 and Sr contents, low Y and Yb contents with high Sr/Y (27−67) and La/Yb (35−99) ratios. High K 2 O and Th contents, low Nb/U, Ce/Pb, Ti/Eu and Nd/Sm ratios and low MgO, Mg#, Cr and Ni contents suggest that the Dala two-mica granites were derived from partial melting of a thickened lower crust. Low negative zircon ε Hf (t) values (−10.4 to −0.5) with old two-stage Hf model ages (1.1-1.8 Ga), high ( 87 Sr/ 86 Sr) i (0.715861-0.717665) with low ε Nd (t) (−12.5 to −11.3) and high Pb isotopes [( 206 Pb/ 204 Pb) i =18.783-18.861, ( 207 Pb/ 204 Pb) i =18.783-18.861 and ( 208 Pb/ 204 Pb) i =39.052-39.285], together with previous literature data, indicate that the magma source for the Eocene granites in the Yardoi area was composed of ancient lower crust consisting mainly of garnetamphibolite and probably subordinate metapelites of the High Himalayan Crystalline Sequence. The residual mineral assemblage of garnet + rutile + plagioclase ± amphibole in the source region demonstrates that the crust beneath the Himalaya could have been thickened to 50 km in the Eocene. Combining with previous studies, we propose that the Eocene magmatic rocks in the Tethyan Himalaya (e.g. ca. 43 Ma old Dala two-mica granites) can be best interpreted as the consequence of breakoff of the Neo-Tethyan oceanic slab.

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“…Sr is variably depleted in most samples, implying that plagioclase in the source material of these siliciclastic rocks was decomposed during weathering [58]. The lower or comparable Zr and Hf concentrations and the average Nb/Ta and Zr/Hf ratios (Table S1) similar to those of the UCC suggest that secondary fractionation is negligible, and that there is no preferential accumulation of detrital zircons in these siliciclastic rocks [59][60][61].…”

Section: Whole-rock Geochemistrymentioning

confidence: 89%

The Redefinition of the “Bulunkuole Group” in the West Kunlun Orogenic Belt, Xinjiang (NW China): Implications for Tectonic Evolution of the Proto-Tethys

Ding

Tang

et al. 2023

Minerals

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The formation ages and tectonic features of the Bulunkuole Complex (BKC) is critical for understanding the geological evolution of the western section of the West Kunlun Orogenic Belt (WKOB), and they are also critical for understanding the metallogenic background of the Taxkorgan Iron Belt. In this paper, we report new geochemical and in situ zircon U–Pb isotopes data for the most southwestern iron-bearing formation of the BKC. The petrography and sedimentation ages of the BKC reveal that the main part of the BKC was emplaced in the Early to Late Cambrian period as a giant accretionary wedge formed during the Proto-Tethys Ocean south-southwestward subduction. The high-pressure metamorphic rocks located at the margin of the Kangxiwa Fault should be further disintegrated from the Cambrian BKC to form a Triassic accretionary complex. Geochemical characteristics indicate that the metasedimentary rocks of the Cambrian BKC derived predominantly from the regional contemporary intermediate to felsic source rocks, and deposited in the fore-arc basin. Provenance studies further demonstrate that the detrital materials were mainly sourced from the Gondwana-affinity terranes, Mazar Terrane as well as the volcanic and magmatic rocks produced during the Tethys subduction. The metamorphism of the Cambrian BKC occurred at ca. 200 Ma in the western section of the WKOB. Proto-Tethys Ocean did not close until 230 Ma, possibly during the Early Mesozoic (200–180 Ma).

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Changing provenance of late Neoarchean metasedimentary rocks in the Anshan-Benxi area, North China Craton: Implications for the tectonic setting of the world-class Dataigou banded iron formation

Cited by 37 publications

References 89 publications

Iron and Carbon Isotope Constraints on the Formation Pathway of Iron-Rich Carbonates within the Dagushan Iron Formation, North China Craton

Iron and Carbon Isotope Constraints on the Formation Pathway of Iron-Rich Carbonates within the Dagushan Iron Formation, North China Craton

Crustal thickening prior to 43 Ma in the Himalaya: Evidence from lower crust‐derived adakitic magmatism in Dala, eastern Tethyan Himalaya, Tibet

The Redefinition of the “Bulunkuole Group” in the West Kunlun Orogenic Belt, Xinjiang (NW China): Implications for Tectonic Evolution of the Proto-Tethys

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