Paleoproterozoic Rift-Related Volcanism of the Xiong'er Group, North China Craton: Implications for the Breakup of Columbia

Zhao, Taiping; Zhou, Mei‐Fu; Zhai, M.-G.; Xia, Bin

doi:10.2747/0020-6814.44.4.336

Cited by 203 publications

(75 citation statements)

References 39 publications

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“…The Ruyang Group is un-metamorphosed and comprises a 380-429 m thick succession of siliciclastic and carbonate rocks, which (in ascending stratigraphic order) is divided into the Baicaoping and Beidajian formations. The Ruyang Group unconformably overlies the Archaean crystalline basement with metamorphic age of c. 2350 Ma (Xiao et al, 1997) and the volcanoclastics of the Paleoproterozoic Xionger Group, dated to c. 1760 Ma (Zhao et al, 2002). The succession is overlain disconformably by several other Proterozoic formations and then by Neoproterozoic tillites and Cambrian strata (Guan et al, 1988;Yin, 1997;Yin et al, 2005).…”

Section: Geological Settingmentioning

confidence: 99%

Affinity, life cycle, and intracellular complexity of organic-walled microfossils from the Mesoproterozoic of Shanxi, China

Agić¹,

Moczydłowska²,

Yin

2015

J. Paleontol.

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Abstract.-Light microscope and scanning electron microscope observations on new material of unicellular microfossils Dictyosphaera macroreticulata and Shuiyousphaeridium macroreticulatum, from the Mesoproterozoic Ruyang Group in China, provide insights into the microorganisms' biological affinity, life cycle and cellular complexity. Gigantosphaeridium fibratum n. gen. et sp., is described and is one of the largest Mesoproterozoic microfossils recorded. Phenotypic characters of vesicle ornamentation and excystment structures, properties of resistance and cell wall structure in Dictyosphaera and Shuiyousphaeridium are all diagnostic of microalgal cysts. The wide size ranges of the various morphotypes indicate growth phases compatible with the development of reproductive cysts. Conspecific biologically, each morphotype represents an asexual (resting cyst) or sexual (zygotic cyst) stage in the life cycle, respectively. We reconstruct this hypothetical life cycle and infer that the organism demonstrates a reproductive strategy of alternation of heteromorphic generations. Similarly in Gigantosphaeridium, a metabolically expensive vesicle with processes suggests its protective role as a zygotic cyst. In combination with all these characters and from the resemblance to extant green algae, we propose the placement of these ancient microorganisms in the stem group of Chloroplastida (Viridiplantae). A cell wall composed of primary and secondary layers in Dictyosphaera and Shuiyouisphaeridium required a high cellular complexity for their synthesis and the presence of an endomembrane system and the Golgi apparatus. The plastid was also present, accepting the organism was photosynthetic. The biota reveals a high degree of morphological and cell structural complexity, and provides an insight into ongoing eukaryotic evolution and the development of complex life cycles with sexual reproduction by 1200 Ma.

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Section: Geological Settingmentioning

confidence: 99%

Affinity, life cycle, and intracellular complexity of organic-walled microfossils from the Mesoproterozoic of Shanxi, China

Agić¹,

Moczydłowska²,

Yin

2015

J. Paleontol.

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“…In addition, compared with the voluminous Xiong'er group volcanism in the southern NCC (1.78-1.75 Ga, e.g., Hu and Lin, 1988;Ren et al, 2000;Zhao et al, 2002bZhao et al, , 2004Zhao et al, , 2015Peng et al, 2008;He et al, 2009), the Guijiayu granitic magmatism was slightly earlier.…”

Section: Zircon U-pb Agesmentioning

confidence: 99%

“…That is, the timing of subduction and subsequent peak collision between continent and continent had finished at least before $1.80 Ga in the southern margin of the NCC. In this respect, invoking other tectonic settings, such as (1) intracontinental rift or mantle plume (e.g., Sun et al, 1981;Zhao et al, 2002b;Zhai and Liu, 2003;Peng et al, 2005Peng et al, , 2008Peng et al, , 2015aZhai et al, , 2014Zhai et al, , 2015Wang et al, 2015) or (2) continental margin arc (e.g., Hu and Lin, 1988;Chen et al, 1992;He et al, 2008He et al, , 2009He et al, , 2010, to account for the late Paleoproterozoic (1.80-1.60 Ga) magmatism, especially for the Xiong'er volcanic rocks (e.g., Ren et al, 2000;Zhao et al, 2002bZhao et al, , 2004Zhao et al, , 2015Peng et al, 2008;He et al, 2009) that are younger than $1.80 Ga event and did not show strong metamorphic and deformation signatures, seems to be incompatible with such metamorphic P-T paths in the southern margin of the NCC. Consequently, a post-collisional regime is the most viable mechanism to interpret the generation of the Guijiayu aluminous Atype granite.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

“…Meanwhile, they would also induce large volume of basic magmatism followed by decompressional melting of asthenosphere. However, the Paleoproterozoic rocks exposed in the southern margin of the NCC are dominated by intermediate to felsic rocks with minor mafic rocks (e.g., Hu and Lin, 1988;Ren et al, 2000;Zhao et al, 2002bZhao et al, , 2004Zhao et al, , 2015Peng et al, 2004Peng et al, , 2005Peng et al, , 2008Peng et al, , 2015aHe et al, 2008He et al, , 2009Wang et al, 2008;Hu et al, 2010;Bi et al, 2011) arguing against geodynamic background of either lithospheric delamination (e.g., Kay and Kay, 1993) or orogenic collapse (e.g., Turner et al, 1999;Rey et al, 2001). By contrast, slab breakoff is the most feasible mechanism to account for such magmatic characteristics in the southern margin of the NCC.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

“…The Xiong'er Group is dominated by intermediate to acidic lavas and pyroclastic rocks with minor intercalated sedimentary rocks (<5%), whose emplacement ages at about 1.80-1.75 Ga (possibly extending to 1.45 Ga) (e.g., Sun et al, 1981;Hu and Lin, 1988;Ren et al, 2000;Zhao et al, 2002bZhao et al, , 2004Zhao et al, , 2015Peng et al, 2008;He et al, 2008He et al, , 2009. In turn, the Xiong'er Group is overlain unconformably by the Meso-to Neoproterozoic terrigenous clastic rocks and carbonates (Fig.…”

Section: Geological Backgroundmentioning

confidence: 99%

See 2 more Smart Citations

Geochronology and geochemistry of the late Paleoproterozoic aluminous A-type granite in the Xiaoqinling area along the southern margin of the North China Craton: Petrogenesis and tectonic implications

Deng

Peng

Zhao

2016

Precambrian Research

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Lithospheric thinning and reworking of Late Archean juvenile crust on the southern margin of the North China Craton: evidence from the Longwangzhuang Paleoproterozoic A‐type granites and their surrounding Cretaceous adakite‐like granites

et al. 2012

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In the Longwangzhuang area along the southern margin of the North China Craton (NCC), a layer of Cretaceous K‐feldspar granites surrounds Paleoproterozoic granites. The Paleoproterozoic granites are enriched in sodic ferrogedrite and show low Al2O3 (12.3–13.0 wt%) and aluminum saturation index (ASI) (0.93–1.09) with high Zr (609–966 ppm), Y (47.2–96.7 ppm) and Nb (58.7–97.7 ppm) concentrations, resembling A‐type granites. The Cretaceous K‐feldspar granites have relatively high Sr (145–419 ppm), Ba (1252–1660 ppm), Sr/Y (19–127), La/Yb (36–56) ratios, but low Y (4.01–8.88 ppm) and Yb (0.46–0.99 ppm), geochemically resembling adakite‐like rocks. However, these Cretaceous adakite‐like K‐feldspar granites have rather low MgO (0.08–0.26 wt%), Al2O3 (13.6–14.5 wt%), Mg# (11–23), Cr (2.30–4.61 ppm) and high initial 86Sr/87Sr (0.7098–0.7118), as well as abundant K‐feldspar minerals, and are different from typical adakite. Zircon LA–ICP–MS geochronology shows that the two types of granites investigated in this study formed at 1616 ± 20 Ma and 140 ± 1 Ma, respectively. However, zircons from both the Paleoproterozoic and Cretaceous granites yield similar two‐stage Hf model ages at ca. 2.5–2.6 Ga, suggesting the reworking of Late Archean juvenile crust. The Paleoproterozoic A‐type granites show enriched Nd–Hf isotopic features but high whole‐rock oxygen isotopes. These rocks may have formed from partial melting of restitic crustal material during lithospheric thinning, along with extension and experienced crystal fractionation of plagioclase, apatite and magnetite. The Cretaceous adakite‐like K‐feldspar granites were formed by local anatexis of TTG rocks from the Taihua Group, with amphibole as the major residual phase. The local anatexis and accompanying migmatisation suggest crustal compression and possible transpression. Therefore, the lithospheric thinning in the NCC should have taken place after 140 Ma on the southern margin of the NCC. Copyright © 2012 John Wiley & Sons, Ltd.

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Paleoproterozoic Rift-Related Volcanism of the Xiong'er Group, North China Craton: Implications for the Breakup of Columbia

Cited by 203 publications

References 39 publications

Affinity, life cycle, and intracellular complexity of organic-walled microfossils from the Mesoproterozoic of Shanxi, China

Affinity, life cycle, and intracellular complexity of organic-walled microfossils from the Mesoproterozoic of Shanxi, China

Geochronology and geochemistry of the late Paleoproterozoic aluminous A-type granite in the Xiaoqinling area along the southern margin of the North China Craton: Petrogenesis and tectonic implications

Lithospheric thinning and reworking of Late Archean juvenile crust on the southern margin of the North China Craton: evidence from the Longwangzhuang Paleoproterozoic A‐type granites and their surrounding Cretaceous adakite‐like granites

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