The Grenvillian Songshugou ophiolite in the Qinling Mountains, Central China: Implications for the tectonic evolution of the Qinling orogenic belt

Dong, Yunpeng; Zhou, Mei‐Fu; Zhang, Guowei; Zhou, Dingwu; Liu, Liang; Zhang, Qi

doi:10.1016/j.jseaes.2007.11.010

Cited by 132 publications

(77 citation statements)

References 24 publications

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“…3). The protolith of the metamafic rocks are metamorphosed basalt and show typical N-MORB and E-MORB affinity Liu et al, 2004;Dong et al, 2008). Some HP mafic granulites within the amphibolites and felsic granulites are recognized near the Xigou fault at the southern side of the Songshugou ophiolite Chen et al, 2004).…”

Section: Geological Settingmentioning

confidence: 97%

“…Dong et al (2008) obtained a Sm-Nd whole-rock isochron age of 1030 ± 46 Ma with an ε Nd (t) value of 5.7 from these rocks. We consider that the period ca.…”

Section: Age Of the Songshugou Ophiolitementioning

confidence: 98%

“…We combine the data with the previous study on the same rocks Dong et al, 2008). The mafic rocks of the Songshugou ophiolite are distributed in the basalt and picrobasalt field in the TAS diagram (LeBas et al, 1986;Fig.…”

Section: Whole-rock Geochemistrymentioning

confidence: 99%

“…The ophiolite is mainly composed of metamorphosed ultramafic and mafic rocks. The ultramafic rocks are enclosed within the mafic rocks, with the tectonic boundary showing intense ductile deformation and mylonitization Dong et al, 2008).…”

Section: Geological Settingmentioning

confidence: 99%

“…The garnet amphibolite occurs as discontinuous lenses in the amphibolite which is considered as a contact aureole around the ultramafic rocks (Dong et al, 2008), and show a gradual change to metamorphosed amphibolite and retrograde schistose plagioclase amphibolite outward (Fig. 3).…”

Section: Geological Settingmentioning

confidence: 99%

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Early Paleozoic tectonic evolution of the North Qinling orogenic belt: Evidence from geochemistry, phase equilibrium modeling and geochronology of metamorphosed mafic rocks from the Songshugou ophiolite

et al. 2016

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Section: Geological Settingmentioning

confidence: 97%

“…Dong et al (2008) obtained a Sm-Nd whole-rock isochron age of 1030 ± 46 Ma with an ε Nd (t) value of 5.7 from these rocks. We consider that the period ca.…”

Section: Age Of the Songshugou Ophiolitementioning

confidence: 98%

Section: Whole-rock Geochemistrymentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 3 more Smart Citations

Early Paleozoic tectonic evolution of the North Qinling orogenic belt: Evidence from geochemistry, phase equilibrium modeling and geochronology of metamorphosed mafic rocks from the Songshugou ophiolite

et al. 2016

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Olivine fabrics and tectonic evolution of fore‐arc mantles: A natural perspective from the Songshugou dunite and harzburgite in the Qinling orogenic belt, central China

Cao

Jung

Song

2017

Geochem Geophys Geosyst

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To advance our understanding of the deformation characteristics, rheological behaviors, and tectonic evolution of the fore‐arc lithospheric mantle, we analyzed mineral fabrics for a large spinel‐bearing ultramafic massif in the Songshugou area in the Qinling orogenic belt, central China. In the spinel‐poor coarse‐grained dunite, stronger A/D‐type and weaker C‐type‐like fabrics were found, whereas the spinel‐rich coarse‐grained dunite displayed a comparatively stronger B‐type‐like fabric. These olivine fabrics are high‐T fabrics influenced by the presence of melt, in which B and C‐type‐like fabrics are inferred to be produced by melt‐assisted grain boundary sliding during synkinematic high‐T melt‐rock reactions. In contrast, the spinel‐poor porphyroclastic and fine‐grained dunites present weak AG and B‐type‐like fabrics, respectively. Their olivine fabrics (low‐T fabrics) are inferred to transform from A/D‐type fabric in their coarse‐grained counterparts possibly through mylonitization process assisted by low‐T fluid‐rock reactions, during which strain was accommodated by the fluid‐enhanced dislocation slip and/or fluid‐assisted grain boundary sliding processes. Combined with the tectonic results of our previous work, the high‐T olivine fabrics are probably related to a young and warm fore‐arc mantle where intense partial melting and high‐T boninitic melt‐rock reactions prevalently occurred, whereas the low‐T olivine fabrics likely reflect the evolving tectonic settings through the cooling fore‐arc mantle to a continental lower crust in a collisional orogeny where low‐T fluid‐rock reactions were pervasively activated. These low‐T olivine fabrics imply that though cold, the fore‐arc lithospheric mantle may be locally weak (∼20–30 MPa), allowing ductile deformation to occur at a geologically significant strain rate.

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Re–Os geochronology, fluid inclusions and genesis of the 0.85 Ga Tumen molybdenite–fluorite deposit in Eastern Qinling, China: implications for pre‐Mesozoic Mo enrichment and tectonic setting

et al. 2013

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The East Qinling Molybdenum Belt (EQMB), central China, hosting tens of Mesozoic magmatic hydrothermal Mo deposits, is one of the largest molybdenum belts in the world. Recently, a new type of Mo mineralization characterized by molybdenite-fluorite veins was discovered with ongoing prospecting at the Tumen area in the Huaxiong block, representing the southernmost tectonic unit of the North China Craton. The molybdenite-fluorite veins occur in faults or ductile shear zones cross-cutting the Neoproterozoic Luanchuan Group. At the Tumen deposit, CO 2 -rich, aqueous and daughter mineral-bearing fluid inclusions are observed in fluorite. These fluid inclusions resemble those reported from magmatic hydrothermal Mo systems formed in intracontinental tectonic settings and yield homogenization temperatures up to 450 C, with salinities up to 39.8 wt.% NaCl equiv, suggesting that the mineralization resulted from a magmatic fluid system. Seven molybdenite analyses from the molybdenite-fluorite veins yield Re-Os isotope ages ranging from 845.8 AE 7.3 to 965.3 AE 7.2 Ma, with an isochron age of 847.4 AE 7.3 Ma (2s, MSWD = 23), marking the timing of mineralization as Neoproterozoic. These ages are broadly comparable with the 844.3 AE 1.6 Ma age reported from the Shuangshan syenite located near the mining area, and the ca. 830 Ma gabbros occurring within the same tectonic unit, indicating that the deposit was possibly related to Neoproterozoic rifting at the southern margin of the North China Craton. The age data correspond to the transition from the culmination of the assembly of the Neoproterozoic supercontinent Rodinia to the beginning of its break-up. Our results provide new insights into the regional tectonics and show that the Mo mineralization is not related to the much younger Mesozoic Yanshanian magmatism as considered in previous studies.

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The Grenvillian Songshugou ophiolite in the Qinling Mountains, Central China: Implications for the tectonic evolution of the Qinling orogenic belt

Cited by 132 publications

References 24 publications

Early Paleozoic tectonic evolution of the North Qinling orogenic belt: Evidence from geochemistry, phase equilibrium modeling and geochronology of metamorphosed mafic rocks from the Songshugou ophiolite

Early Paleozoic tectonic evolution of the North Qinling orogenic belt: Evidence from geochemistry, phase equilibrium modeling and geochronology of metamorphosed mafic rocks from the Songshugou ophiolite

Olivine fabrics and tectonic evolution of fore‐arc mantles: A natural perspective from the Songshugou dunite and harzburgite in the Qinling orogenic belt, central China

Re–Os geochronology, fluid inclusions and genesis of the 0.85 Ga Tumen molybdenite–fluorite deposit in Eastern Qinling, China: implications for pre‐Mesozoic Mo enrichment and tectonic setting

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