Geochronology, geochemistry and tectonic significance of two Early Cretaceous A-type granites in the Gan-Hang Belt, Southeast China

Yang, Shui-Yuan; Jiang, Shao‐Yong; Zhao, Kui-Dong; Jiang, Yao-Hui; Ling, Hong‐Fei; Luo, Li

doi:10.1016/j.lithos.2012.01.028

Cited by 135 publications

(70 citation statements)

References 75 publications

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“…As mentioned earlier, in addition to Ehuling volcanic rocks, a number of Early Cretaceous A 2 -type granites have been identified along the Gan-Hang Belt and in the WZG region (Jiang et al, 2011;Li et al, 2013;Wong et al, 2009;Yang et al, 2012;Zhou et al, 2013). It has long been recognized that A-type magmas are mostly emplaced in extensional tectonic settings, including continental arc, back-arc extension, post-collisional extension and within-plate settings (Eby, 1992;Förster et al, 1997;Jiang et al, 2009;Jiang et al, 2011;Smith et al, 1999;Whalen et al, 1996).…”

Section: Early Cretaceous (Approximately 130 Ma)mentioning

confidence: 83%

“…Wong et al (2009) suggested that the Baijuhuajian magma was derived originally from asthenospheric mantle and experienced extensive crystal fractionation and minor mixing with old crustal components. Others have preferred a formation model by the partial melting of ancient crustal protoliths followed by fractional crystallization (Jiang et al, 2011;Yang et al, 2011;Yang et al, 2012).…”

Section: Petrogenetic Modelmentioning

confidence: 99%

“…Their ages, petrogenesis, tectonic settings and geodynamics have been the focus of many studies over the last few decades (Chen and Jahn, 1998;He et al, 2010;Hsü et al, 1988;Hsü et al, 1990;Jiang et al, 2006;Jiang et al, 2008;Jiang et al, 2009;Jiang et al, 2011;Lapierre et al, 1997;Li et al, 2014;Qi et al, 2013;Wong et al, 2009;Wong et al, 2011;Xu, 2008;Yang et al, 2012;Yu et al, 2006;Zhou and Li, 2000;Zhou et al, 2006). Although volcanic rocks are well developed and widely distributed in South China, as an important part of the coastal area within China and even the circum-Pacific volcanic belt, they have received much less attention than granites (e.g., Guo et al, 2012;Jiang et al, 2005;Su et al, 2014;Yang et al, 2011;.…”

Section: Introductionmentioning

confidence: 99%

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Geochronology, geochemistry and tectonic significance of the late Mesozoic volcanic sequences in the northern Wuyi Mountain volcanic belt of South China

Xiong

Jiang

2016

Gondwana Research

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The widespread occurrence of late Mesozoic volcanic rocks in the Gan-Hang Belt in South China is associated with similarly widespread mineralization, but many important questions surrounding these volcanic rocks have not been clearly answered. The Tianhuashan basin located in the northern Wuyi Mountain volcanic belt is one of the most important volcanic basins in the Gan-Hang Belt, and it is primarily composed of the Daguding and Ehuling Formations and their intrusive counterparts. LA-ICP-MS zircon U-Pb dating shows that the Daguding Formation erupted in the Late Jurassic (152-160 Ma), whereas the Ehuling Formation erupted in the Early Cretaceous (131-139 Ma) in the Tianhuashan basin. Volcanic rocks are rhyolite and share similar trace and rare earth element patterns with an enrichment of LREEs and a depletion in Sr, Ba, Nb, Ta, P, Eu and Ti. They are also characterized by negative whole rock ε Nd (t) and zircon ε Hf (t) values with Paleoproterozoic t 2DM ages, suggesting that they were derived primarily from the remelting of ancient crustal materials. Daguding volcanic rocks are strongly peraluminous and show a higher Mg# than pure crustal melts, implying that they were likely derived from Paleoproterozoic metasedimentary basement materials. However, Ehuling volcanic rocks are weakly peraluminous and have a pronounced A 2 -type geochemical signature. Detailed elemental and isotopic data suggest that they were formed by the partial melting of the Paleoproterozoic metamorphic basement (including metasedimentary and metaigneous rocks) at a high temperature (~840°C), followed by fractional crystallization. These results imply that during the Late Jurassic, South China on the Gan-Hang Belt was a continental arc coupled with the subduction of the Paleo-Pacific plate. Since the beginning of the Early Cretaceous, an intra-arc rift has formed along the Gan-Hang Belt as a consequence of slab rollback. These results also indicate that the extension in the Gan-Hang Belt began later than the southwestern part of the Shi-Hang Zone and lasted from A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 139 Ma to 122 Ma.

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Section: Early Cretaceous (Approximately 130 Ma)mentioning

confidence: 83%

Section: Petrogenetic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochronology, geochemistry and tectonic significance of the late Mesozoic volcanic sequences in the northern Wuyi Mountain volcanic belt of South China

Xiong

Jiang

2016

Gondwana Research

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“…The Early Cretaceous A-type granitic rocks along the Gan-Hang belt have duration from 137 to 122 Ma, indicating the extension (back-arc extension or intra-arc rift) is likely to start as early as ca. 137 Ma (Yang et al, 2012). Zhu et al (2014) documented that strong extension might have been driven by the roll-back of paleo-Pacific Plate since Early Cretaceous strata (ca.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Genesis of highly fractionated I-type granites from Fengshun complex: Implications to tectonic evolutions of South China

Zhou

Xie

et al. 2016

J. Earth Sci.

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The South China Block is characterized by the large-scale emplacement of felsic magmas and giant ore deposits during the Yanshanian. We present zircon Hf isotopic compositions, whole-rock major and trace element compositions of the Fengshun complex, located in eastern Guangdong Province, South China. The Fengshun complex is a multi-stage magmatic intrusion. It is composed of two main units, i.e., the Mantoushan (MTS) syeno-monzogranites, alkali feldspar granites and the Hulutian (HLT) alkali feldspar granites. LA-ICPMS zircon dating shows that the complex emplaced in 166-161 and 139±2 Ma, respectively. Geochemically, the MTS granites show relatively various geochemical compositions with low REE contents (87.76×10 -6 -249.71×10 -6 ), Rb/Sr ratios (1.19-58.93), pronounced Eu negative anomaly (0.01-0.37) and low Nb/Ta ratios (2.40-6.82). In contrast, the HLT granites exhibit relatively stable geochemical characteristics with high REE contents (147.35×10 -6 -282.17×10 -6 ), Rb/Sr ratios (2.05-10.30) and relatively high Nb/Ta ratios (4.45-13.00). The isotopic data of the MTS granites display relatively enriched values, with I Sr varying from 0.708 2 to 0.709 7, ε Nd (t) from -7.8 to -6.9 and ε Hf (t) from -7.4 to -3.2, in comparison with those of the HLT which are I Sr =0.703 05-0.704 77, ε Nd (t)=-5--3.4 and ε Hf (t)=-0.7-1.8). The two-stage model ages of the MTS granites (T 2DM (Nd)=1.51-1.59 Ga and T 2DM (Hf)=1.26-1.48 Ga) are also higher than those of the HLT granites (T 2DM (Nd)=1.21-1.34 Ga and T 2DM (Hf)=0.96-1.10 Ga). Thus the MTS and HLT granites might originate from different sources. The former is more likely derived from partial melting of Meso-Proterozoic basement triggered by upwelling of asthenosphere and/or underplate of the basaltic magma and then extensive fractional crystallisation, similar to the genesis of Early Yanshanian granitoids of the EW-trending tectono-magmatism belt in the Nanling range. In comparison, the latter might have involved with asthenosphere component, similar to the Early Cretaceous granitoids of NE-NNE-trending granitoid-volcanic belt in coastal region, southeastern China. We propose that the MTS granites were mainly formed in Paleo-Tethyan post-orogenic extensional tectonic setting whereas the HLT granites were formed in the back-arc extensional tectonic setting. The period at 139 Ma represents the initial time of roll-back of the paleo-Pacific Plate in SE-trending.

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“…(4) The high F contents of the granites are likely due to decomposition of phengite as a result of an abrupt temperature rise during slab rollback (Li et al, 2012a). Slab rollback is suggested by the occurrences of A-type granites (Li et al, 2012b;Yang et al, 2012b). Uranium deposits are controlled by F, the chemical form of U and other physic-chemical conditions (Chen et al, in press).…”

Section: Contribution To This Special Issuementioning

confidence: 99%

Mesozoic large scale magmatism and mineralization in South China: Preface

Sun

Yang

et al. 2012

Lithos

156

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Geochronology, geochemistry and tectonic significance of two Early Cretaceous A-type granites in the Gan-Hang Belt, Southeast China

Cited by 135 publications

References 75 publications

Geochronology, geochemistry and tectonic significance of the late Mesozoic volcanic sequences in the northern Wuyi Mountain volcanic belt of South China

Geochronology, geochemistry and tectonic significance of the late Mesozoic volcanic sequences in the northern Wuyi Mountain volcanic belt of South China

Genesis of highly fractionated I-type granites from Fengshun complex: Implications to tectonic evolutions of South China

Mesozoic large scale magmatism and mineralization in South China: Preface

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